MAX3483,85-86,88,90-91E Datasheet by Maxim Integrated

| Download PDF Datasheet

MAX3483EIMAX3485EI 3.3V—Powered, i15kV ESD-Protected,

General Description

Devices in the MAX3483E family (MAX3483E/MAX3485E/

MAX3486E/MAX3488E/MAX3490E/MAX3491E) are

±15kV ESD-protected, +3.3V, low-power transceivers for

RS-485 and RS-422 communications. Each device con-

tains one driver and one receiver. The MAX3483E and

MAX3488E feature slew-rate-limited drivers that minimize

EMI and reduce reflections caused by improperly termi-

nated cables, allowing error-free data transmission at

data rates up to 250kbps. The partially slew-rate-limited

MAX3486E transmits up to 2.5Mbps. The MAX3485E,

MAX3490E, and MAX3491E transmit at up to 12Mbps.

All devices feature enhanced electrostatic discharge

(ESD) protection. All transmitter outputs and receiver

inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap

Discharge, ±8kV using IEC 1000-4-2 Contact Discharge,

and ±15kV using the Human Body Model.

Drivers are short-circuit current limited and are protected

against excessive power dissipation by thermal shutdown

circuitry that places the driver outputs into a high-impedance

state. The receiver input has a fail-safe feature that guar-

antees a logic-high output if both inputs are open circuit.

The MAX3488E, MAX3490E, and MAX3491E feature full-

duplex communication, while the MAX3483E, MAX3485E,

and MAX3486E are designed for half-duplex communication.

Applications

●Telecommunications

●Industrial-Control Local Area Networks

●Transceivers for EMI-Sensitive Applications

●Integrated Services Digital Networks

●Packet Switching

Features

●ESD Protection for RS-485 I/O Pins

• ±15kV—Human Body Model

• ±8kV—IEC 1000-4-2, Contact Discharge

• ±15kV—IEC 1000-4-2, Air-Gap Discharge

●Operate from a Single +3.3V Supply—

No Charge Pump Required

●Interoperable with +5V Logic

●Guaranteed 12Mbps Data Rate

(MAX3485E/MAX3490E/MAX3491E)

●Slew-Rate Limited for Errorless Data Transmission

(MAX3483E/MAX3488E)

●2nA Low-Current Shutdown Mode

(MAX3483E/MAX3485E/MAX3486E/MAX3491E)

●-7V to +12V Common-Mode Input Voltage Range

●Full-Duplex and Half-Duplex Versions Available

●Industry-Standard 75176 Pinout

(MAX3483E/MAX3485E/MAX3486E)

●Current-Limiting and Thermal Shutdown for

Driver Overload Protection

19-1474; Rev 1; 5/19

Ordering Information continued at end of data sheet.

PART TEMP. RANGE PIN-PACKAGE

MAX3483ECSA 0°C to+70°C 8 SO

MAX3483ECPA 0°C to+70°C 8 Plastic DIP

MAX3483EESA -40°C to+85°C 8 SO

MAX3483EEPA -40°C to+85°C 8 Plastic DIP

PART

NUMBER

GUARANTEED

DATA RATE

(Mbps)

SUPPLY

VOLTAGE

(V)

HALF/FULL

DUPLEX

SLEW-RATE

LIMITED

DRIVER/

RECEIVER

ENABLE

SHUTDOWN

CURRENT

(nA)

±15kV

ESD

PROTECTION

COUNT

MAX3483E 0.25

3.0 to 3.6

Half Yes Yes 2Yes 8

MAX3485E 12 Half No Yes 2Yes 8

MAX3486E 2.5 Half Yes Yes 2Yes 8

MAX3488E 0.25 Full Yes No — Yes 8

MAX3490E 12 Full No No — Yes 8

MAX3491E 12 Full No Yes 2Yes 14

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Selector Guide

Ordering Information

Click here for production status of specific part numbers.

TDFN-14

Supply Voltage (VCC) ............................................................+7V

Control Input Voltage (RE, DE) ...............................-0.3V to +7V

Driver Input Voltage (DI) ..........................................-0.3V to +7V

Driver Output Voltage (A, B, Y, Z) ......................-7.5V to +12.5V

Receiver Input Voltage (A, B) ............................. -7.5V to +12.5V

Receiver Output Voltage (RO) ................. -0.3V to (VCC + 0.3V)

Continuous Power Dissipation (TA = +70°C)

8-Pin SO (derate 5.88mW/°C above +70°C) ............... 471mW

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..727mW

14-Pin SO (derate 8.33mW/°C above +70°C) ................667mW

14-Pin Plastic DIP (derate 10mW/°C above +70°C) .......800mW

Operating Temperature Ranges

MAX34_ _ EC_ _ ................................................ 0°C to +70°C

MAX34_ _ EE_ _ ............................................ -40°C to +85°C

Junction Temperature ...................................................... +150°C

Storage Temperature Range ............................ -65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

TDFN-14

PACKAGE CODE S14+1

Outline Number 21-0041

Land Pattern Number 90-0112

Thermal Resistance, Single-Layer Board:

Junction to Ambient (θJA) 120°C/W

Junction to Case (θJC) 37°C/W

Thermal Resistance, Four-Layer Board:

Junction to Ambient (θJA) 84°C/W

Junction to Case (θJC) 34°C/W

Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.

For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that

a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the

drawing pertains to the package regardless of RoHS status.

Package Information

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

(VCC = +3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Differential Driver Output VOD

RL = 100Ω (RS-422), Figure 4 2.0

VRL = 54Ω (RS-485), Figure 4 1.5

RL = 60Ω (RS-485), VCC = 3.3V, Figure 5 1.5

Change in Magnitude of Driver

Differential Output Voltage for

Complementary Output States

(Note 1)

∆VOD RL = 54Ω or 100Ω, Figure 4 0.2 V

Driver Common-Mode Output

Voltage VOC RL = 54Ω or 100Ω, Figure 4 3 V

Change in Magnitude of

Common-Mode Output Voltage

(Note 1)

∆VOC RL = 54Ω or 100Ω, Figure 4 0.2 V

Input High Voltage VIH DE, DI, RE 2.0 V

Input Low Voltage VIL DE, DI, RE 0.8 V

Logic Input Current IIN1 DE, DI, RE ±2 μA

Input Current (A, B) IIN2

DE = 0V,

VCC = 0V or 3.6V

VIN = 12V 1.0 mA

VIN = -7V -0.8

Output Leakage (Y, Z) IO

DE = 0V, RE = 0V,

VCC = 0V or 3.6V, MAX3491E

VOUT = 12V 20 μA

VOUT = -7V -20

Output Leakage (Y, Z)

in Shutdown Mode IO

DE = 0V, RE = VCC,

VCC = 0V or 3.6V, MAX3491E

VOUT = 12V 1 μA

VOUT = -7V -1

Receiver Differential Threshold

Voltage VTH -7V ≤ VCM ≤ 12V -0.2 0.2 V

Receiver Input Hysteresis ∆VTH VCM = 0V 50 mV

Receiver Output High Voltage VOH IOUT = -1.5mA, VID = 200mV, Figure 6 VCC - 0.4 V

Receiver Output Low Voltage VOL IOUT = 2.5mA, VID = 200mV, Figure 6 0.4 V

Three-State (High Impedance)

Output Current at Receiver IOZR VCC = 3.6V, 0V ≤ VOUT ≤ VCC ±1 μA

Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V 12 kΩ

Supply Voltage Range VCC 3.0 3.6 V

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

DC Electrical Characteristics

(VCC = +3.3V, TA = +25°C.)

(VCC = +3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C)

*MAX3488E and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Current ICC

No load,

DI = 0 or VCC

DE = VCC, RE = 0 or VCC 1.1 2.2 mA

DE = 0V, RE = 0 0.95 1.9

Supply Current in Shutdown Mode ISHDN DE = 0, RE = VCC, DI = VCC or 0 0.002 1 µA

Driver Short-Circuit Output

Current IOSD

VOUT = -7V -250 mA

VOUT = 12V 250

Receiver Short-Circuit Output

Current IOSR 0 ≤ VRO ≤ VCC ±8 ±60 mA

ESD Protection for Y, Z, A, B

IEC 1000-4-2 Air Discharge ±15

IEC 1000-4-2 Contact Discharge (MAX3483E,

MAX3485E, MAX3486E, MAX3491E) ±8

IEC 1000-4-2 Contact Discharge (MAX3490E,

MAX3488E)* ±6

Human Body Model ±15

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Maximum Data Rate 12 15 Mbps

Driver Differential Output Delay tDD RL = 60Ω, Figure 7 1 22 35 ns

Driver Differential Output Transition Time tTD RL = 60Ω, Figure 7 311 25 ns

Driver Propagation Delay, Low-to-High Level tPLH RL = 27Ω, Figure 8 7 23 35 ns

Driver Propagation Delay, High-to-Low Level tPHL RL = 27Ω, Figure 8 7 23 35 ns

|tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27Ω, Figure 8 -1.4 ±8 ns

DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3485E/MAX3491E only)

Driver

Output Enable Time to Low Level tPZL RL = 110Ω, Figure 10 42 90 ns

Driver

Output Enable Time to High Level tPZH RL = 110Ω, Figure 9 42 90 ns

Driver

Output Disable Time from High Level tPHZ RL = 110Ω, Figure 9 35 80 ns

Driver

Output Disable Time from Low Level tPLZ RL = 110Ω, Figure 10 35 80 ns

Driver

Output Enable Time from Shutdown to Low Level tPSL RL = 110Ω, Figure 10 650 900 ns

Driver

Output Enable Time from Shutdown to High Level tPSH RL = 110Ω, Figure 9 650 900 ns

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Driver Switching Characteristics—MAX3485E/MAX3490E/MAX3491E

DC Electrical Characteristics (continued)

(VCC = +3.3V, TA = +25°C)

(VCC = +3.3V, TA = +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Maximum Data Rate 2.5 Mbps

Driver Differential Output Delay tDD RL = 60Ω, Figure 7 20 42 70 ns

Driver Differential Output Transition Time tTD RL = 60Ω, Figure 7 15 28 60 ns

Driver Propagation Delay, Low-to-High Level tPLH RL = 27Ω, Figure 8 20 42 75 ns

Driver Propagation Delay, High-to-Low Level tPHL RL = 27Ω, Figure 8 20 42 75 ns

|tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27Ω, Figure 8 -6 ±12 ns

DRIVER-OUTPUT ENABLE/DISABLE TIMES

Driver Output Enable Time to Low Level tPZL RL = 110Ω, Figure 10 52 100 ns

Driver Output Enable Time to High Level tPZH RL = 110Ω, Figure 9 52 100 ns

Driver Output Disable Time from High Level tPHZ RL = 110Ω, Figure 9 40 80 ns

Driver Output Disable Time from Low Level tPLZ RL = 110Ω, Figure 10 40 80 ns

Driver Output Enable Time from Shutdown to Low Level tPSL RL = 110Ω, Figure 10 700 1000 ns

Driver Output Enable Time from Shutdown to High Level tPSH RL = 110Ω, Figure 9 700 1000 ns

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Maximum Data Rate 250 kbps

Driver Differential Output Delay tDD RL = 60Ω, Figure 7 600 900 1400 ns

Driver Differential Output Transition Time tTD RL = 60Ω, Figure 7 400 740 1200 ns

Driver Propagation Delay, Low-to-High Level tPLH RL = 27Ω, Figure 8 700 930 1500 ns

Driver Propagation Delay, High-to-Low Level tPHL RL = 27Ω, Figure 8 700 930 1500 ns

|tPLH - tPHL| Driver Propagation Delay Skew (Note 2) tPDS RL = 27Ω, Figure 8 ±50 ns

DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3483E only)

Driver-Output Enable Time to Low Level tPZL RL = 110Ω, Figure 10 900 1300 ns

Driver-Output Enable Time to High Level tPZH RL = 110Ω, Figure 9 600 800 ns

Driver-Output Disable Time from High Level tPHZ RL = 110Ω, Figure 9 50

Driver-Output Disable Time from Low Level tPLZ RL = 110Ω, Figure 10 50

Driver-Output Enable Time from Shutdown to Low Level tPSL RL = 110Ω, Figure 10 1.9 2.7 µs

Driver-Output Enable Time from Shutdown to High Level tPSH RL = 110Ω, Figure 9 2.2 3.0 µs

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Driver Switching Characteristics—MAX3483E/MAX3488E

Driver Switching Characteristics—MAX3486E

(VCC = +3.3V, TA = +25°C)

Note 1: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.

Note 2: Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|.

Note 3: The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns,

the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to

have entered shutdown. See Low-Power Shutdown Mode section.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Time to Shutdown tSHDN

MAX3483E/MAX3485E/MAX3486E/MAX3491E

only (Note 3) 80 190 300 ns

Receiver Propagation Delay,

Low-to-High Level tRPLH

VID = 0 to 3.0, CL = 15pF, Figure 11 25 62 90 ns

MAX3483E/MAX3488E 25 75 120

Receiver Propagation Delay,

High-to-Low Level tRPHL

VID = 0 to 3.0, CL = 15pF, Figure 11 25 62 90 ns

MAX3483E/MAX3488E 25 75 120

|tPLH - tPHL| Receiver

Propagation Delay Skew tRPDS

VID = 0 to 3.0, CL = 15pF, Figure 11 6 ±10 ns

MAX3483E/MAX3488E 12 ±20

Receiver Output Enable Time

to Low Level tPRZL

CL = 15pF, Figure 12,

MAX3483E/85E/86E/91E only 25 50 ns

Receiver Output Enable Time

to High Level tPRZH

CL = 15pF, Figure 12,

MAX3483E/85E/86E/91E only 25 50 ns

Receiver Output Disable

Time from High Level tPRHZ

CL = 15pF, Figure 12,

MAX3483E/85E/86E/91E only 25 45 ns

Receiver Output Disable

Time from Low Level tPRLZ

CL = 15pF, Figure 12,

MAX3483E/85E/86E/91E only 25 45 ns

Receiver Output Enable Time

from Shutdown to Low Level tPRSL

CL = 15pF, Figure 12,

MAX3483E/85E/86E/91E only 720 1400 ns

Receiver Output Enable Time

from Shutdown to High Level tPRSH

CL = 15pF, Figure 12,

MAX3483E/85E/86E/91E only 720 1400 ns

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Receiver Switching Characteristics

'\ E 53% 191 5:8 GE

(VCC = +3.3V, TA = +25°C, unless otherwise noted.)

-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

0 0.5 1.0 1.5 2.0 2.5 3.53.0

OUTPUT CURRENT vs.

RECEIVER OUTPUT HIGH VOLTAGE

TOC02

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

3.00

3.05

3.10

3.15

3.20

3.25

3.30

-40 -20 0 20 40 60 10080

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

TOC03

TEMPERATURE (°C)

OUTPUT HIGH VOLTAGE (V)

IRO = 1.5mA

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

-40 -20 0 20 40 60 10080

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

TOC04

TEMPERATURE (°C)

OUTPUT LOW VOLTAGE (V)

IRO = 2.5mA

100

0 0.5 1.0 1.5 2.0 2.5 3.53.0

DRIVER OUTPUT CURRENT vs.

DIFFERENTIAL OUTPUT VOLTAGE

TOC05

DIFFERENTIAL OUTPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

2.4

2.6

2.5

-40 -20 0 20 40 60 10080

DRIVER DIFFERENTIAL OUTPUT

VOLTAGE vs.TEMPERATURE

TOC06

TEMPERATURE (°C)

DIFFERENTIAL OUTPUT VOLTAGE (V)

R = 54Ω

100

125

150

175

0 2 4 6 8 10 12

OUTPUT CURRENT vs.

DRIVER OUTPUT LOW VOLTAGE

TOC07

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

0 0.5 1.0 1.5 2.0 2.5 3.53.0

OUTPUT CURRENT vs.

RECEIVER OUTPUT LOW VOLTAGE

TOC01

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

-100

-80

-60

-40

-20

543210

-7 -6 -3-4-5 -2 -1

OUTPUT CURRENT vs.

DRIVER OUTPUT HIGH VOLTAGE

TOC08

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

Maxim Integrated

│

www.maximintegrated.com

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Typical Operating Characteristics

(VCC = +3.3V, TA = +25°C, unless otherwise noted.)

NAME FUNCTION

MAX3483E

MAX3485E

MAX3486E

MAX3488E

MAX3490E MAX3491E

1 2 2 RO Receiver Output. If A > B by 200mV, RO will be high; if A < B by 200mV, RO

will be low.

2 — 3 RE

Receiver Output Enable. RO is enabled when RE is low; RO is high

impedance when RE is high. If RE is high and DE is low, the device will

enter a low-power shutdown mode.

3 — 4 DE

Driver Output Enable. The driver outputs are enabled by bringing DE high.

They are high impedance when DE is low. If RE is high and DE is low, the

device will enter a low-power shutdown mode. If the driver outputs are

enabled, the parts function as line drivers. While they are high impedance,

they function as line receivers if RE is low.

4 3 5 DI Driver Input. A low on DI forces output Y low and output Z high. Similarly, a

high on DI forces output Y high and output Z low.

5 4 6, 7 GND Ground

— 5 9 Y Noninverting Driver Output

— 6 10 Z Inverting Driver Output

6 — — A Noninverting Receiver Input and Noninverting Driver Output

— 8 12 A Noninverting Receiver Input

7 — — B Inverting Receiver Input and Inverting Driver Output

— 7 11 B Inverting Receiver Input

8 1 13, 14 VCC Positive Supply: 3.0V ≤ VCC ≤ 3.6V. Do not operate device with VCC > 3.6V

— — 1, 8 N.C. No Connection. Not internally connected.

0.8

0.7

0.9

1.0

1.1

1.2

-40 -20 0 20 40 60 10080

SUPPLY CURRENT

vs. TEMPERATURE

TOC09

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

X = DON’T CARE

DE = VCC, RE = X

DE = 0, RE = 0

100

-40 -20 0 20 40 60 10080

SHUTDOWN CURRENT

vs. TEMPERATURE

TOC10

TEMPERATURE (°C)

SHUTDOWN CURRENT (nA)

Maxim Integrated

│

www.maximintegrated.com

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Typical Operating Characteristics (continued)

Pin Description

F wmvi *QWff *% 3 3 3 3 E E E E w W #3 av K m 4% 3333333 V. i EEKKEEK

Figure 1. MAX3483E/MAX3485E/MAX3486E Pin Configuration and Typical Operating Circuit

Figure 2. MAX3488E/MAX3490E Pin Configuration and Typical Operating Circuit

Figure 3. MAX3491E Pin Configuration and Typical Operating Circuit

MAX3483E

MAX3485E

MAX3486E

TOP VIEW

NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.

VCC

GND

RO R

VCC

GND

SO/DIP

MAX3488E

MAX3490E

TOP VIEW

GND

VCC

SO/DIP

VCC

GND

VCC

D R

MAX3491E

SO/DIP

TOP VIEW

DE VCC

RE GND

VCC RE

GND DE

N.C.

1, 8

3 6, 7

13, 144

VCC

N.C.

GND

R D

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Figure 4. Driver VOD and VOC

Figure 6. Receiver VOH and VOL

Figure 5. Driver VOD with Varying Common-Mode Voltage

Figure 7. Driver Differential Output Delay and Transition Times

VCC

DVOD

VOC

VOH IOH

(-)

IOL

(+)

VOL

VID

VCC

DVOD RL

VCM =

-7V to +12V

375Ω

VCC

50Ω

RL =

60Ω

CL = 15pF (NOTE 5)

GENERATOR

(NOTE 4)

DOUT

tDO

tTD

50%

1.5V

10%

OUT

90%

50%

1.5V

10%

90%

≈ 2.0V

≈ -2.0V

tDO

tTD

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

vo SI t VQH VDL 2 v v 51 I % a f a <7 ’="" i="" :="" 025v="" v="" m="" vm="" f="" 2="" vc="" 51="" nh="">

Figure 8. Driver Propagation Times

Figure 9. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)

Figure 10. Driver Enable and Disable Times (tPZL, tPSL, tPLZ)

VCC

VOM

VOH

VOM

VOL

VOH

VOL

50Ω

RL = 27Ω

CL = 15pF

(NOTE 5)

GENERATOR

(NOTE 4)

tPLH

1.5V

OUT

IN 1.5V

≈ 1.5V

tPHL

tPHL tPLH

VOH + VOL

VOM =

VOH

VOM

RL = 110Ω

CL = 50pF

(NOTE 5)

D0V OR 3V

50Ω

GENERATOR

(NOTE 4)

tPZH

1.5V

0.25V

OUT

IN 1.5V

≈ 1.5V

tPHZ

VOH + VOL

VOM =

VCC

RL = 110Ω

CL = 50pF

(NOTE 5)

50Ω

GENERATOR

(NOTE 4)

OUT

VCC

VOL

VOM

tPSL

1.5V

0.25V

OUT

IN 1.5V

tPLZ

0V OR 3V

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

:ﬁ E m Q

Note 4: The input pulse is supplied by a generator with the following characteristics: f = 250kHz, 50% duty cycle, tr ≤ 6.0ns, ZO = 50Ω.

Note 5: CL includes probe and stray capacitance.

Figure 11. Receiver Propagation Delay

Figure 12. Receiver Enable and Disable Times

VID

50ΩCL = 15pF

(NOTE 5)

GENERATOR

(NOTE 4)

ROUT

tRPLH

1.5V

OUT

1.5V

IN 1.5V

3.0V

tRPHL

VCC

VOM VOM

VCC

VOM =

VCC

VOL

(NOTE 5)

1.5V

-1.5V

50Ω

GENERATOR

(NOTE 4)

VCC

VID

1.5V

OUT

IN 1.5V

S1 CLOSED

S2 OPEN

S3 = -1.5V

tPRZL

tPRSL

VOH

1.5V

OUT

IN 1.5V

S1 OPEN

S2 CLOSED

S3 = 1.5V

tPRZH

tPRSH

VCC

VOL

0.25V

OUT

IN 1.5V

S1 CLOSED

S2 OPEN

S3 = -1.5V

tPRLZ

VOH

0.25V

1.5V

OUT

S1 OPEN

S2 CLOSED

S3 = 1.5V

tPRHZ

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Function Tables

Devices with Receiver/Driver Enable

(MAX3483E/MAX3485E/MAX3486E/MAX3491E)

Devices without Receiver/Driver Enable

(MAX3488E/MAX3490E)

Applications Information

The MAX3483E/MAX3485E/MAX3486E/MAX3488E/

MAX3490E/MAX3491E are low-power transceivers for

RS-485 and RS-422 communications. The MAX3483E

and MAX3488E can transmit and receive at data rates

up to 250kbps, the MAX3486E at up to 2.5Mbps, and the

MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The

MAX3488E/MAX3490E/MAX3491E are full-duplex trans-

ceivers, while the MAX3483E/MAX3485E/MAX3486E

are half-duplex. Driver Enable (DE) and Receiver Enable

(RE) pins are included on the MAX3483E/MAX3485E/

MAX3486E/MAX3491E. When disabled, the driver and

receiver outputs are high impedance.

Reduced EMI and Reflections

(MAX3483E/MAX3486E/MAX3488E)

The MAX3483E/MAX3488E are slew-rate limited, mini-

mizing EMI and reducing reflections caused by improp-

erly terminated cables. Figure 13 shows the driver output

waveform of a MAX3485E/MAX3490E/MAX3491E trans-

mitting a 125kHz signal, as well as the Fourier analysis

of that waveform. High-frequency harmonics with large

amplitudes are evident. Figure 14 shows the same

information, but for the slew-rate-limited MAX3483E/

MAX3488E transmitting the same signal. The high-fre-

quency harmonics have much lower amplitudes, and the

potential for EMI is significantly reduced.

Low-Power Shutdown Mode

(MAX3483E/MAX3485E/MAX3486E/MAX3491E)

A low-power shutdown mode is initiated by bringing both

RE high and DE low. The devices will not shut down

unless both the driver and receiver are disabled (high

impedance). In shutdown, the devices typically draw only

2nA of supply current.

For these devices, the tPSH and tPSL enable times

assume the part was in the low-power shutdown mode;

the tPZH and tPZL enable times assume the receiver or

driver was disabled, but the part was not shut down.

Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/

MAX3490E/MAX3491E Transmitting a 125kHz Signal

Figure 14. Driver Output Waveform and FFT Plot of

MAX3483E/ MAX3488E Transmitting a 125kHz Signal

* B and A outputs are Z and Y, respectively, for full-duplex part

(MAX3491E).

X = Don’t care; High-Z = High impedance

* DE is a “don’t care” (x) for the full-duplex part (MAX3491E).

X = Don’t care; High-Z = High impedance

Table 1. Transmitting

Table 2. Receiving

Table 3. Transmitting Table 4. Receiving

INPUTS OUTPUTS MODE

RE DE DI B* A*

X 1 1 0 1 Normal

X 1 0 1 0 Normal

0 0 X High-Z High-Z Normal

1 0 X High-Z High-Z Shutdown

INPUTS OUTPUTS MODE

RE DE A, B RO

0 0* ≥ +0.2V 1 Normal

0 0* ≤ -0.2V 0 Normal

0 0* Inputs Open 1 Normal

1 0 X High-Z Shutdown

INPUT OUTPUTS

DI Z Y

1 0 1

0 1 0

INPUTS OUTPUT

A, B RO

≥ +0.2V 1

≤ -0.2V 0

Inputs Open 1

5MHz500kHz/div0

10dB/div

5MHz500kHz/div0

10dB/div

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Figure 15. MAX3485E/MAX3490E/MAX3491E Driver

Propagation Delay

Figure 17. MAX3483E/MAX3488E Driver Propagation Delay

Figure 19. MAX3483E/MAX3488E System Differential Voltage

at 125kHz Driving 4000 Feet of Cable

Figure 16. MAX3485E/MAX3490E/MAX3491E Receiver

Propagation Delay Driven by External RS-485 Device

Figure 18. MAX3483E/MAX3488E Receiver Propagation Delay

Figure 20. MAX3485E/MAX3490E/MAX3491E System

Differential Voltage at 125kHz Driving 4000 Feet of Cable

2V/div

20ns/div

1V/div

2V/div

1V/div

1µs/div

5V/div

VY - VZ

2V/div

5V/div

2µs/div

1V/div

2V/div

20ns/div

1V/div

2V/div

1µs/div

5V/div

VY - VZ

2V/div

5V/div

2µs/div

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

va W2 m

Driver Output Protection

Excessive output current and power dissipation caused

by faults or by bus contention are prevented by two

mechanisms. A foldback current limit on the output stage

provides immediate protection against short circuits over

the whole common-mode voltage range (see Typical

Operating Characteristics). In addition, a thermal shut-

down circuit forces the driver outputs into a high-imped-

ance state if the die temperature rises excessively.

Propagation Delay

Figures 15–18 show the typical propagation delays. Skew

time is simply the difference between the low-to-high and

high-to-low propagation delay. Small driver/receiver skew

times help maintain a symmetrical mark-space ratio (50%

duty cycle).

The receiver skew time, |tPRLH - tPRHL|, is under 10ns

20ns for the MAX3483E/MAX3488E). The driver skew

times are 8ns for the MAX3485E/MAX3490E/MAX3491E,

12ns for the MAX3486E, and typically under 50ns for the

MAX3483E/MAX3488E.

Line Length vs. Data Rate

The RS-485/RS-422 standard covers line lengths up to

4000 feet. For line lengths greater than 4000 feet, see

Figure 21 for an example of a line repeater.

Figures 19 and 20 show the system differential voltage

for parts driving 4000 feet of 26AWG twisted-pair wire at

125kHz into 120Ω loads.

For faster data rate transmission, please consult the factory.

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures are

incorporated on all pins to protect against electrostatic

discharges encountered during handling and assembly.

The driver outputs and receiver inputs of the MAX3483E

family of devices have extra protection against static

electricity. Maxim’s engineers have developed state-of-

the-art structures to protect these pins against ESD of

±15kV without damage. The ESD structures withstand

high ESD in all states: normal operation, shutdown, and

powered down. After an ESD event, Maxim’s E versions

keep working without latchup or damage.

ESD protection can be tested in various ways; the trans-

mitter outputs and receiver inputs of this product family

are characterized for protection to the following limits:

1) ±15kV using the Human Body Model

2) ±8kV using the Contact-Discharge method specified

in IEC 1000-4-2

3) ±15kV using IEC 1000-4-2’s Air-Gap method.

ESD Test Conditions

ESD performance depends on a variety of conditions.

Contact Maxim for a reliability report that documents test

setup, test methodology, and test results.

Human Body Model

Figure 22a shows the Human Body Model and Figure

22b shows the current waveform it generates when dis-

charged into a low impedance. This model consists of a

100pF capacitor charged to the ESD voltage of interest,

which is then discharged into the test device through a

1.5kΩ resistor.

IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and

performance of finished equipment; it does not specifi-

cally refer to integrated circuits. The MAX3483E family of

devices helps you design equipment that meets Level 4

(the highest level) of IEC 1000-4-2, without the need for

additional ESD-protection components.

The major difference between tests done using the

Human Body Model and IEC 1000-4-2 is higher peak cur-

rent in IEC 1000-4-2, because series resistance is lower

in the IEC 1000-4-2 model. Hence, the ESD withstand

voltage measured to IEC 1000-4-2 is generally lower than

that measured using the Human Body Model. Figure 23a

shows the IEC 1000-4-2 model, and Figure 23b shows

the current waveform for the ±8kV IEC 1000-4-2, Level 4

ESD contact-discharge test. test.

Figure 21. Line Repeater for MAX3488E/MAX3490E/MAX3491E

120Ω

120ΩDATA IN

DATA OUT

MAX3488E

MAX3490E

MAX3491E

NOTE: RE AND DE ON MAX3491 ONLY.

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

The air-gap test involves approaching the device with a

charged probe. The contact-discharge method connects

the probe to the device before the probe is energized.

Machine Model

The Machine Model for ESD tests all pins using a 200pF

storage capacitor and zero discharge resistance. Its

objective is to emulate the stress caused when I/O pins

are contacted by handling equipment during test and

assembly. Of course, all pins require this protection, not

just RS-485 inputs and outputs.

Typical Applications

The MAX3483E/MAX3485E/MAX3486E/MAX3488E/

MAX3490E/MAX3491E transceivers are designed for

bidirectional data communications on multipoint bus

transmission lines. Figures 24 and 25 show typical net-

work applications circuits. These parts can also be used

as line repeaters, with cable lengths longer than 4000

feet, as shown in Figure 21.

To minimize reflections, the line should be terminated

at both ends in its characteristic impedance, and stub

lengths off the main line should be kept as short as

possible. The slew-rate-limited MAX3483E/MAX3488E

and the partially slew-rate-limited MAX3486E are more

tolerant of imperfect termination.

Figure 22a. Human Body ESD Test Model Figure 22b. Human Body Current Waveform

Figure 23a. IEC 1000-4-2 ESD Test Model Figure 23b. IEC 1000-4-2 ESD Generator Current Waveform

CHARGE-CURRENT-

LIMIT RESISTOR

HIGH-

VOLTAGE

SOURCE

100pF

3722²

DISCHARGE

RESISTANCE

DEVICE

UNDER

TEST

STORAGE

CAPACITOR

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

100%

90%

36.8%

10%

AMPERES

CHARGE-CURRENT-

LIMIT RESISTOR

HIGH-

VOLTAGE

SOURCE

150pF

50M TO 100 M

552²

DISCHARGE

RESISTANCE

DEVICE

UNDER

TEST

STORAGE

CAPACITOR

60ns

30ns

= 0.7ns

TO 1ns

10%

90%

100%

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

”Mi: WV m7 AV A won 7 5

Figure 24. MAX3483E/MAX3485E/MAX3486E Typical RS-485 Network

Figure 25. MAX3488E/MAX3490E/MAX3491E Full-Duplex RS-485 Network

DI RO DE

RERE

120Ω120Ω

MAX3483E

MAX3485E

MAX3486E

120Ω120Ω

DI DIRO RO

DE DE

A A A

B B

MAX3488E

MAX3490E

MAX3491E

NOTE: RE AND DE ON MAX3491 ONLY.

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

PART TEMP. RANGE PIN-PACKAGE

MAX3485ECSA 0°C to+70°C 8 SO

MAX3485ECPA 0°C to+70°C 8 Plastic DIP

MAX3485EESA -40°C to+85°C 8 SO

MAX3485EEPA -40°C to+85°C 8 Plastic DIP

MAX3486ECSA 0°C to +70°C 8 SO

MAX3486ECPA 0°C to +70°C 8 Plastic DIP

MAX3486EESA -40°C to +85°C 8 SO

MAX3486EEPA -40°C to +85°C 8 Plastic DIP

MAX3488ECSA 0°C to +70°C 8 SO

MAX3488ECPA 0°C to +70°C 8 Plastic DIP

MAX3488EESA -40°C to +85°C 8 SO

MAX3488EEPA -40°C to +85°C 8 Plastic DIP

MAX3490ECSA 0°C to +70°C 8 SO

MAX3490ECPA 0°C to +70°C 8 Plastic DIP

MAX3490EESA -40°C to +85°C 8 SO

MAX3490EEPA -40°C to +85°C 8 Plastic DIP

MAX3491ECSD 0°C to +70°C 14 SO

MAX3491ECPD 0°C to +70°C 14 Plastic DIP

MAX3491EESD -40°C to +85°C 14 SO

MAX3491EEPD -40°C to +85°C 14 Plastic DIP

www.maximintegrated.com Maxim Integrated

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

Ordering Information (continued) Chip Information

TRANSISTOR COUNT: 761

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 4/99 Initial release —

1 5/19 Updated Absolute Maximum Ratings and Package Information section 2

Revision History

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

│

MAX3483E/MAX3485E/

MAX3486E/MAX3488E/

MAX3490E/MAX3491E

3.3V-Powered, ±15kV ESD-Protected,

12Mbps and Slew-Rate-Limited

True RS-485/RS-422 Transceivers

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.