Real Time Clocks

Results: 2,330
Manufacturer
ABLIC Inc.Abracon LLCAmbiq Micro, Inc.Analog Devices Inc./Maxim IntegratedAustria MicroBenchmarqCymbet CorporationDallas SemiconductorDiodes IncorporatedECS Inc.ElantecEM Microelectronic
Series
-*2-Wire™ArtasieC2C3C7C8EconoRAMLV8571ARA-4574SARA-8565SA
Packaging
BagBulkCut Tape (CT)Digi-Reel®StripTape & Reel (TR)TrayTube
Product Status
ActiveDiscontinued at Digi-KeyLast Time BuyNot For New DesignsObsolete
DigiKey Programmable
Not VerifiedVerified
Type
Binary CounterClock/CalendarClock/Calendar/SupervisorElapsed Time CounterPhantom Time ChipPortable System ControllerReal Time Clock (RTC)Temperature RecorderTime Event RecorderTimer Clock Peripheral (TCP)
Features
-AlarmAlarm, Backup Supply Charger, Leap Year, RAMAlarm, Battery Switch, Clock Output Hz-MHz, Event Input, Temperature Alarm, Timer, Trickle Charge with Charge PumpAlarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle ChargerAlarm, Battery Switch, Leap Year, Programmable Clock Output, Timer, Watchdog TimerAlarm, Daylight Savings, Leap Year, NVSRAM, Square Wave OutputAlarm, Daylight Savings, Leap Year, RAMAlarm, Daylight Savings, Leap Year, SRAMAlarm, Daylight Savings, Leap Year, Supervisor, Watchdog TimerAlarm, Daylight Savings, NVRAM, NVSRAM, Square Wave Output, Y2KAlarm, Daylight Savings, NVSRAM
Memory Size
1B2B2B, 43B2B, 8B3B7B8B10B16B16B, 32B31B32B
Time Format
-BinaryHH:MM:SSHH:MM:SS (12/24 hr)HH:MM:SS (24 hr)HH:MM:SS:100th (24 hr)HH:MM:SS:hhHH:MM:SS:hh (12/24 hr)HH:MM:SS:hh (24 hr)
Date Format
-BinaryYY-MM-DDYY-MM-DD-ddYYYY-MM-DD
Interface
1-Wire® and 3-Wire1-Wire® Serial2-Wire Serial3-Wire Serial3-Wire Serial, 4-Wire Serial3-Wire Serial, SPI4-Wire Serial-I2CI2C, 2-Wire SerialI2C, SerialI2C, SMBusI2C, SPIMultiplexed
Voltage - Supply
0.9V ~ 1.8V, 0.9V ~ 5.5V0.9V ~ 5.5V0.9V ~ 5.5V, 1.8V ~ 5.5V1V ~ 4.4V1V ~ 5.5V1.1V ~ 5.5V1.1V, 1.2V, 2V ~ 5.5V1.2V ~ 5.5V1.25V ~ 5.5V1.3V ~ 4.4V1.3V ~ 5.5V1.3V ~ 5.5V, 2.1V ~ 5.5V
Voltage - Supply, Battery
0.9V ~ 3.6V0.9V ~ 5.5V1V ~ 5.5V1.1V ~ 5.5V1.15V ~ 5.5V1.2V ~ 5.5V1.3V ~ 3.63V1.3V ~ 3.6V1.3V ~ 3.7V1.3V ~ 5.5V1.4V ~ 3.6V1.4V ~ 5.5V
Current - Timekeeping (Max)
0.05µA @ 2.5V ~ 5.5V0.06µA @ 2.5V ~ 5.5V0.06µA @ 3V0.08µA @ 3V0.17µA ~ 0.22µA @ 1.8V ~ 3V0.18µA @ 3V180nA @ 3V210nA @ 3V0.24µA @ 3V0.25µA @ 3V0.25µA ~ 0.27µA @ 3V ~ 5V0.25µA ~ 0.45µA @ 3V ~ 5V
Operating Temperature
-40°C ~ 105°C-40°C ~ 105°C (TA)-40°C ~ 125°C-40°C ~ 125°C (TA)-40°C ~ 85°C-40°C ~ 85°C (TA)-30°C ~ 70°C-30°C ~ 80°C-25°C ~ 70°C-20°C ~ 70°C-10°C ~ 70°C0°C ~ 70°C0°C ~ 70°C (TA)-
Mounting Type
-Surface MountSurface Mount, Wettable FlankThrough Hole
Grade
-Automotive
Qualification
-AEC-Q100AEC-Q200
Package / Case
6-SMD, J-Lead6-VBGA, FCBGA6-VFBGA, FCBGA6-WDFN Exposed Pad8-DIP (0.300", 7.62mm)8-LCC8-LSSOP (0.173", 4.40mm Width)8-SMD8-SMD, Flat Leads8-SOIC (0.154", 3.90mm Width)8-SOIC (0.173", 4.40mm Width)8-SOIC (0.173", 4.40mm Width) Exposed Pad
Supplier Device Package
6-FlipChip (1.09x1.37)6-FlipChip (2.82x2.54)6-TDFN (3x3)6-TDFN-EP (3x3)6-TSOC8-CLCC (3.2x1.5)8-DIP8-EMP8-HSOP-E8-HVSON (4x4)8-HWSON (2x3)8-LCC (1.5x3.2)
Stocking Options
Environmental Options
Media
Marketplace Product
2,330Results

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of 2,330
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Mfr Part #
Quantity Available
Price
Series
Package
Product Status
DigiKey Programmable
Type
Features
Memory Size
Time Format
Date Format
Interface
Voltage - Supply
Voltage - Supply, Battery
Current - Timekeeping (Max)
Operating Temperature
Mounting Type
Grade
Qualification
Package / Case
Supplier Device Package
8-SOIC
MCP7940MT-I/SN
IC RTC CLK/CALENDAR I2C 8SOIC
Microchip Technology
4,694
In Stock
1 : ¥5.70000
Cut Tape (CT)
3,300 : ¥5.01572
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
-
1µA @ 5.5V
-40°C ~ 85°C
Surface Mount
-
-
8-SOIC (0.154", 3.90mm Width)
8-SOIC
8-SOIC
MCP7940N-I/SN
IC RTC CLK/CALENDAR I2C 8SOIC
Microchip Technology
4,271
In Stock
100 : ¥6.46090
Tube
-
Tube
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
Automotive
AEC-Q100
8-SOIC (0.154", 3.90mm Width)
8-SOIC
8-TDFN
MCP7940MT-I/MNY
IC RTC CLK/CALENDAR I2C 8TDFN
Microchip Technology
21,302
In Stock
1 : ¥6.55000
Cut Tape (CT)
3,300 : ¥5.73832
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
-
1µA @ 5.5V
-40°C ~ 85°C
Surface Mount
-
-
8-WFDFN Exposed Pad
8-TDFN (2x3)
8-SOIC
MCP7940NT-I/SN
IC RTC CLK/CALENDAR I2C 8SOIC
Microchip Technology
26,245
In Stock
1 : ¥7.23000
Cut Tape (CT)
3,300 : ¥6.46095
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
Automotive
AEC-Q100
8-SOIC (0.154", 3.90mm Width)
8-SOIC
8-MSOP
MCP7940NT-I/MS
IC RTC CLK/CALENDAR I2C 8MSOP
Microchip Technology
31,034
In Stock
1 : ¥7.65000
Cut Tape (CT)
2,500 : ¥6.80097
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
Automotive
AEC-Q100
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-MSOP
8-MSOP
MCP7940N-I/MS
IC RTC CLK/CALENDAR I2C 8MSOP
Microchip Technology
3,062
In Stock
1 : ¥7.39000
Tube
-
Tube
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
Automotive
AEC-Q100
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-MSOP
8-SOIC
MCP7940NT-E/SN
IC RTC CLK/CALENDAR I2C 8SOIC
Microchip Technology
3,643
In Stock
1 : ¥7.82000
Cut Tape (CT)
3,300 : ¥6.90724
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 125°C
Surface Mount
Automotive
AEC-Q100
8-SOIC (0.154", 3.90mm Width)
8-SOIC
10-DFN
PCF85063ATL/1,118
IC RTC CLK/CALENDAR I2C 10DFN
NXP USA Inc.
49,153
In Stock
1 : ¥8.08000
Cut Tape (CT)
4,000 : ¥3.42831
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output
-
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
-
0.6µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
10-XFDFN Exposed Pad
10-DFN (2.6x2.6)
8-TDFN
MCP7940NT-I/MNY
IC RTC CLK/CALENDAR I2C 8TDFN
Microchip Technology
44,637
In Stock
1 : ¥7.80000
Cut Tape (CT)
3,300 : ¥6.81416
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM
64B
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
Automotive
AEC-Q100
8-WFDFN Exposed Pad
8-TDFN (2x3)
8 SOIC
PCF85063AT/AY
IC RTC CLOCK/CALENDAR I2C 8SO
NXP USA Inc.
78,702
In Stock
1 : ¥8.29000
Cut Tape (CT)
2,500 : ¥3.51626
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output
-
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
-
0.6µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-SOIC (0.154", 3.90mm Width)
8-SO
8-TSSOP
PCF85063ATT/AJ
IC RTC CLK/CALENDAR I2C 8TSSOP
NXP USA Inc.
48,143
In Stock
1 : ¥8.67000
Cut Tape (CT)
2,500 : ¥3.67715
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output
-
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
-
0.6µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-TSSOP
8-HWSON
PCF85063TP/1Z
IC RTC CLK/CALENDAR I2C 8HWSON
NXP USA Inc.
46,845
In Stock
1 : ¥8.67000
Cut Tape (CT)
4,000 : ¥3.67714
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output
-
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
-
0.6µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-WFDFN Exposed Pad
8-HWSON (2x3)
8-SOIC
MCP79410-I/SN
IC RTC CLK/CALENDAR I2C 8SOIC
Microchip Technology
9,199
In Stock
1 : ¥8.84000
Tube
-
Tube
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
64B, 1Kb
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-SOIC (0.154", 3.90mm Width)
8-SOIC
8-SOIC
MCP79410T-I/SN
IC RTC CLK/CALENDAR I2C 8SOIC
Microchip Technology
7,337
In Stock
1 : ¥8.84000
Cut Tape (CT)
3,300 : ¥7.73611
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
64B, 1Kb
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-SOIC (0.154", 3.90mm Width)
8-SOIC
8-TSSOP
PCF85363ATT/AJ
IC RTC CLK/CALENDAR I2C 8TSSOP
NXP USA Inc.
97,641
In Stock
1 : ¥8.78000
Cut Tape (CT)
2,500 : ¥4.70218
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Watchdog Timer
64B
HH:MM:SS:hh (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
0.9V ~ 5.5V
0.885µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-TSSOP
8-MSOP
MCP79410T-I/MS
IC RTC CLK/CALENDAR I2C 8MSOP
Microchip Technology
3,021
In Stock
1 : ¥9.18000
Cut Tape (CT)
2,500 : ¥8.18242
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
64B, 1Kb
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-MSOP
8-TDFN
MCP79410T-I/MNY
IC RTC CLK/CALENDAR I2C 8TDFN
Microchip Technology
24,276
In Stock
1 : ¥9.28000
Cut Tape (CT)
3,300 : ¥8.20981
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
64B, 1Kb
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-WFDFN Exposed Pad
8-TDFN (2x3)
8 SOIC
PCF8563T/5,518
IC RTC CLOCK/CALENDAR I2C 8SO
NXP USA Inc.
5,666
In Stock
1 : ¥9.78000
Cut Tape (CT)
2,500 : ¥4.14716
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Watchdog Timer
-
HH:MM:SS (24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1V ~ 5.5V
-
0.6µA ~ 0.75µA @ 2V ~ 5V
-40°C ~ 85°C
Surface Mount
-
-
8-SOIC (0.154", 3.90mm Width)
8-SO
8-MSOP
MCP79411-I/MS
IC RTC CLK/CALENDAR I2C 8MSOP
Microchip Technology
1,865
In Stock
1 : ¥10.03000
Tube
-
Tube
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
64B, 1Kb
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
1.8V ~ 5.5V
1.3V ~ 5.5V
1.2µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-MSOP
10-DFN
PCF85263ATL/AX
IC RTC CLK/CALENDAR I2C 10DFN
NXP USA Inc.
14,731
In Stock
1 : ¥10.43000
Cut Tape (CT)
4,000 : ¥4.59191
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Watchdog Timer
-
HH:MM:SS:hh (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
0.9V ~ 5.5V
0.885µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
10-XFDFN Exposed Pad
10-DFN (2.6x2.6)
10 MSOP
MCP79510-I/MS
IC RTC CLK/CALENDAR SPI 10MSOP
Microchip Technology
10,852
In Stock
1 : ¥10.59000
Tube
-
Tube
Active
Not Verified
Clock/Calendar
Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID
64B
HH:MM:SS:hh (12/24 hr)
YY-MM-DD-dd
SPI
1.8V ~ 3.6V
1.3V ~ 3.6V
1µA @ 1.8V ~ 3.6V
-40°C ~ 85°C
Surface Mount
-
-
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
10-MSOP
10 MSOP
MCP79510T-I/MS
IC RTC CLK/CALENDAR SPI 10MSOP
Microchip Technology
7,748
In Stock
1 : ¥10.97000
Cut Tape (CT)
2,500 : ¥9.60641
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID
64B
HH:MM:SS:hh (12/24 hr)
YY-MM-DD-dd
SPI
1.8V ~ 3.6V
1.3V ~ 3.6V
1µA @ 1.8V ~ 3.6V
-40°C ~ 85°C
Surface Mount
-
-
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
10-MSOP
8 SOIC
PCF85263AT/AJ
IC RTC CLOCK/CALENDAR I2C 8SO
NXP USA Inc.
134,796
In Stock
1 : ¥11.39000
Cut Tape (CT)
2,500 : ¥4.84195
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Watchdog Timer
-
HH:MM:SS:hh (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
0.9V ~ 5.5V
0.885µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-SOIC (0.154", 3.90mm Width)
8-SO
8-TSSOP
PCF85263ATT/AJ
IC RTC CLK/CALENDAR I2C 8TSSOP
NXP USA Inc.
58,796
In Stock
1 : ¥11.39000
Cut Tape (CT)
2,500 : ¥4.84195
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Watchdog Timer
-
HH:MM:SS:hh (12/24 hr)
YY-MM-DD-dd
I2C, 2-Wire Serial
0.9V ~ 5.5V
0.9V ~ 5.5V
0.885µA @ 3.3V
-40°C ~ 85°C
Surface Mount
-
-
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-TSSOP
14-TSSOP
PCF2123TS/1,118
IC RTC CLK/CALENDAR SPI 14TSSOP
NXP USA Inc.
26,984
In Stock
1 : ¥12.23000
Cut Tape (CT)
2,500 : ¥5.59705
Tape & Reel (TR)
-
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
Not Verified
Clock/Calendar
Alarm, Leap Year, Square Wave Output, Watchdog Timer
-
HH:MM:SS (12/24 hr)
YY-MM-DD-dd
SPI
1.6V ~ 5.5V
-
0.33µA ~ 0.38µA @ 2V ~ 5V
-40°C ~ 85°C
Surface Mount
-
-
14-TSSOP (0.173", 4.40mm Width)
14-TSSOP
Showing
of 2,330

Real Time Clocks


Real Time Clocks (RTCs) provide time and/or date information in almost any electronic device which needs to keep accurate time. The clock types are binary counter, clock/calendar/supervisor, elapsed time counter, phantom time chip, portable system controller, temperature recorder, time event recorder, and timer clock peripheral.  They contain memory sizes ranging from 2 B to 2 MB and have interface options of I2C, Parallel, Serial, SPI, 1-Wire, 2-Wire, 3-Wire, and 4-Wire.