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Maxim > Solutions > Network Hubs, Switches, and Routers

Real-Time Clocks

DATA SHEETS
Display Title / Parts Key Advantages
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 Parallel-Interface Elapsed Time Counter
DS1318

Subsecond Elapsed-Time Counter Offers 244µs Resolution
QV  PDF Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM
DS3234

Completely Integrated, Accurate Timing Solution Provides Better than ±2.0 Minutes per Year Accuracy Over the Industrial Temperature Range and Requires No User Calibration
QV  PDF I²C RTC with Trickle Charger
DS1340, DS1340C

I²C Real-Time Clock with Trickle Charger Offers Software Clock Calibration
QV  PDF I²C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
DS1374, DS1374C, DS1374U

Elapsed Time Counter Provides Power-On Reset, Watchdog or Alarm, and Square Wave
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 Portable System Controller
DS1677

QV  PDF Portable System Controller
DS1673

QV  PDF I²C 32-Bit Binary Counter RTC
DS1672

Low-Voltage, Serial Timekeeping Chip Combines an Ultra-Low-Voltage Clock with Sophisticated Power-Monitoring Circuitry, Power-Fail Switches, and a Switch to Optional Trickle-Charging, Replacing Several Discrete Components with One Chip
QV  PDF Portable System Controller
DS1670




Key Specifications:   Oscillator Modules
Part Number Frequency Oscillator Type Tuning Adjustment Type Frequency Output Type Freq. Stability vs. Temp. @0 to +40°C (±ppm) Freq. Stab. vs.Temp. @-40 to 0/ +40 to 85°C (±ppm) Frequency Stability vs. Supply Voltage (±ppm/V) Frequency Stability vs. Aging (±ppm) Supply Voltage (V) Battery Voltage (V) Industry Qualified Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C)
DS3234  32.768kHz TCXO Digital CMOS Push-Pull 2 3.5 1 (typ) 5 (0-10 Years) 2.7 to 5.5
3
3.3
5
2.3 to 3.8 Automotive - General SOIC/20 99 -40 to +85
0 to +70
See All Oscillator Modules (26)

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 Industry Qualified Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C)
DS3234   -  HH:MM:SS YY-MM-DD SPI 2.7 to 5.5
3
3.3
5
1,500  -  NV SRAM 256 2
µP Reset
Power Fail Output
SOIC Package with Integrated Crystal
Square-Wave Output
Automotive - General SOIC/20 99 -40 to +85
0 to +70
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
DS1318 
Elapsed Time Counter
Binary Binary Bytewide 3.3 750 12.5 None  -  1
Periodic Interrupt
 -  TSSOP/24 52 -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
DS1374 
Elapsed Time Counter
Watchdog Timekeeper
Binary Binary I2C 1.8
3
3.3
5
400 6 None  -  1
µP Reset
Periodic Interrupt
SOIC Package with Integrated Crystal
Trickle Charger
 -  SOIC/16
uSOP/10
15 -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  - 
DS1670 
NV SRAM Control
Watchdog Timekeeper
HH:MM:SS YY-MM-DD 3-Wire 3.3 300 6 None  -  1
µP Reset
A to D Converter
Periodic Interrupt
Power Fail Output
 -  SOIC/20
TSSOP/20
45 0 to +70
DS1672 
Elapsed Time Counter
Binary Binary I2C 2
3
3.3
425 6 None  -  0
Trickle Charger
 -  PDIP/8
SOIC/8
uSOP/8
16 -40 to +85
DS1673 
NV SRAM Control
Watchdog Timekeeper
HH:MM:SS YY-MM-DD 3-Wire 3
5
300 6 None  -  1
µP Reset
A to D Converter
Periodic Interrupt
Power Fail Output
 -  SOIC/20
TSSOP/20
45 0 to +70
DS1677 
NV SRAM Control
Watchdog Timekeeper
HH:MM:SS YY-MM-DD 3-Wire 5 300 6 None  -  1
µP Reset
A to D Converter
Periodic Interrupt
Power Fail Output
 -  TSSOP/20 45 0 to +70
See All Timekeeping & Real-Time Clocks (86)





         


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