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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 256k 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

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:   Memory (EPROM, SRAM, EEPROM, ROM, NV SRAM)
Part Number Memory Type Memory Size Bus Type Real-Time Clock DIP with Internal Battery PowerCap Package Battery Monitor With GPIO Single Piece Module Features Supply Voltage (min) (V) Supply Voltage (max) (V) Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C)
DS3070W  NV SRAM 2M x 8 Parallel Yes No No No No Yes
•µP Reset
•Periodic Interrupt
 3 3.6 MOD/256 729 -40 to +85
DS3030W  NV SRAM 32k x 8 Parallel Yes No No No No Yes
•µP Reset
•Periodic Interrupt
 3 3.6 MOD/256 729 -40 to +85
DS3045W  NV SRAM 128k x 8 Parallel Yes No No No No Yes
•µP Reset
•Periodic Interrupt
 3 3.6 MOD/256 729 -40 to +85
See All Memory (EPROM, SRAM, EEPROM, ROM, NV SRAM) (69)

Key Specifications:   Timekeeping & Real-Time Clocks
Part Number Functions Time Format (hh = sec/100) Date Format Interface Supply Voltage (V) Time- keeping Current (typ) (nA) CL, Load Capacitance (pF) Memory Type Memory Size (Bytes) Number of Time of Day Alarms Features Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C)
DS3070W 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3  -   -  NV SRAM 2M 1
•µP Reset
•Periodic Interrupt
 MOD/256 729 -40 to +85
DS3030W 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3  -   -  NV SRAM 32k 1
•µP Reset
•Periodic Interrupt
 MOD/256 729 -40 to +85
DS3045W 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3  -   -  NV SRAM 128k 1
•µP Reset
•Periodic Interrupt
 MOD/256 729 -40 to +85
DS1390   -  HH:MM:SS:hh YY-MM-DD SPI 1.8
3
3.3
5 		500 6 None  -  1
•Square-Wave Output
•Trickle Charger
 uSOP/10 15 -40 to +85
DS1391   -  HH:MM:SS:hh YY-MM-DD SPI 1.8
3
3.3
5 		500 6 None  -  1
•µP Reset
•Power Fail Output
•Trickle Charger
 uSOP/10 15 -40 to +85
DS1392   -  HH:MM:SS:hh YY-MM-DD 3-Wire 1.8
3
3.3
5 		500 6 None  -  1
•Square-Wave Output
•Trickle Charger
 uSOP/10 15 -40 to +85
DS1393   -  HH:MM:SS:hh YY-MM-DD 3-Wire 1.8
3
3.3
5 		500 6 None  -  1
•µP Reset
•Power Fail Output
•Trickle Charger
 uSOP/10 15 -40 to +85
DS12CR887   -  HH:MM:SS YY-MM-DD Multiplexed 3.3
5 		 -   -  NV SRAM 114 1
•Battery + Crystal
•Periodic Interrupt
•Square-Wave Output
 MOD/24 640 -40 to +85
DS12R885   -  HH:MM:SS YY-MM-DD Multiplexed 3.3
5 		800 12.5 NV SRAM 114 1
•Periodic Interrupt
•Square-Wave Output
 SOIC/24 118 -40 to +85
DS12R887   -  HH:MM:SS YY-MM-DD Multiplexed 3.3
5 		 -   -  NV SRAM 114 1
•Battery + Crystal
•Periodic Interrupt
•Square-Wave Output
 BGA/48 181 -40 to +85
DS1340   -  HH:MM:SS YY-MM-DD I2C 1.8
3
3.3
5 		800 12.5 None  -  0
•SOIC Package with Integrated Crystal
•Square-Wave Output
•Trickle Charger
 SOIC/16
SOIC/8
uSOP/8 		16 -40 to +85
DS1338   -  HH:MM:SS YY-MM-DD I2C 1.8
3
3.3
5 		800 12.5 NV SRAM 56 0
•SOIC Package with Integrated Crystal
•Square-Wave Output
 SOIC/16
SOIC/8
uSOP/8 		16 -40 to +85
DS1339   -  HH:MM:SS YY-MM-DD I2C 2
3
3.3
5 		400 6 None  -  2
•SOIC Package with Integrated Crystal
•Square-Wave Output
•Trickle Charger
 SOIC/16
uSOP/8 		16 -40 to +85
DS1337   -  HH:MM:SS YY-MM-DD I2C 2
3
3.3
5 		425 6 None  -  2
•SOIC Package with Integrated Crystal
•Square-Wave Output
 PDIP/8
SOIC/16
SOIC/8
uSOP/8 		16  - 
DS1554 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3
5 		 -   -  NV SRAM 32k 1
•µP Reset
•Battery + Crystal
•Periodic Interrupt
•PowerCap Package
 MOD/32
PWRCP/34 		607 -40 to +85
DS1556 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3
5 		 -   -  NV SRAM 128k 1
•µP Reset
•Battery + Crystal
•Periodic Interrupt
•PowerCap Package
 MOD/32
PWRCP/34 		607 -40 to +85
DS1557 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3
5 		 -   -  NV SRAM 512k 1
•µP Reset
•Periodic Interrupt
•PowerCap Package
 PWRCP/34 607 -40 to +85
See All Timekeeping & Real-Time Clocks (87)


         



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