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Maxim > Solutions > Telecom Switches (PBX and Central Office)

Real-Time Clocks

DATA SHEETS
Display Title/Parts Key Advantages
QV  PDF 3.3V Single-Piece 1Mb Nonvolatile SRAM with Clock
DS3045W

DS3045W 3.3V Single Piece 1M Nonvolatile SRAM with Integrated RTC
QV  PDF 3.3V Single-Piece 256kb Nonvolatile SRAM with Clock
DS3030W

DS3030W 3.3V Single Piece 256kb Nonvolatile SRAM with Integrated RTC
QV  PDF 3.3V Single-Piece 16Mb Nonvolatile SRAM with clock
DS3070W

Industry's First and Only Single-Piece, Reflowable NVSRAM Module
QV  PDF Low-Voltage SPI/3-Wire RTCs with Trickle Charger
DS1390, DS1391, DS1392, DS1393, DS1394

Low-Voltage SPI/3-Wire RTCs with Trickle Charger have the Broadest Feature Set and the Smallest Footprint in Their Class
QV  PDF RTC with Constant-Voltage Trickle Charger
DS12CR887, DS12R885, DS12R887

QV  PDF I²C RTC with Trickle Charger
DS1340, DS1340C

I²C Real-Time Clock with Trickle Charger Offers Software Clock Calibration
QV  PDF I²C RTC with 56-Byte NV RAM
DS1338, DS1338C, DS1338U, DS1338Z

QV  PDF I²C Serial Real-Time Clock
DS1339, DS1339C, DS1339U

RTC Provides System Flexibility with Multiple Programmable Features
QV  PDF I²C Serial Real-Time Clock
DS1337, DS1337C

Industry's Smallest I²C RTC with Two Time-of-Day Alarms
QV  PDF 4Meg, Nonvolatile, Y2K-Compliant Timekeeping RAM
DS1557

QV  PDF 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
DS1556, DS1556P

QV  PDF 256k Nonvolatile, Y2K-Compliant Timekeeping RAM
DS1554




Key Specifications:  Timekeeping & Real-Time Clocks
Part Number Functions Date/ Time Format Interface VSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory Type Memory Size
(Bytes)
Time of Day Alarms
hh = sec/100 typ
DS1394  - YY-MM-DD/ HH:MM:SS:hh SPI
3.3
5
500 6 None - 1
DS1390  - YY-MM-DD/ HH:MM:SS:hh SPI
1.8
3
3.3
5
500 6 None - 1
DS1391  - YY-MM-DD/ HH:MM:SS:hh SPI
1.8
3
3.3
5
500 6 None - 1
DS1392  - YY-MM-DD/ HH:MM:SS:hh 3-Wire
1.8
3
3.3
5
500 6 None - 1
DS1393  - YY-MM-DD/ HH:MM:SS:hh 3-Wire
1.8
3
3.3
5
500 6 None - 1
DS12CR887  - YY-MM-DD/ HH:MM:SS Multiplexed
3.3
5
- - NV SRAM 114 1
DS12R885  - YY-MM-DD/ HH:MM:SS Multiplexed
3.3
5
800 12.5 NV SRAM 114 1
DS12R887  - YY-MM-DD/ HH:MM:SS Multiplexed
3.3
5
- - NV SRAM 114 1
DS1340  - YY-MM-DD/ HH:MM:SS I2C
1.8
3
3.3
5
800 12.5 None - 0
DS1338  - YY-MM-DD/ HH:MM:SS I2C
1.8
3
3.3
5
800 12.5 NV SRAM 56 0
DS1339  - YY-MM-DD/ HH:MM:SS I2C
2
3
3.3
5
400 6 None - 2
DS1337  - YY-MM-DD/ HH:MM:SS I2C
2
3
3.3
5
425 6 None - 2
DS1554  Watchdog Timekeeper YYYY-MM-DD/ HH:MM:SS Bytewide
3.3
5
- - NV SRAM 32K 1
DS1556  Watchdog Timekeeper YYYY-MM-DD/ HH:MM:SS Bytewide
3.3
5
- - NV SRAM 128K 1
DS1557  Watchdog Timekeeper YYYY-MM-DD/ HH:MM:SS Bytewide
3.3
5
- - NV SRAM 512K 1
See All Timekeeping & Real-Time Clocks (80)



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