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Maxim > Solutions > Security Systems

Real-Time Clocks

DATA SHEETS
Display Title / Parts Key Advantages
QV    Ultra-Low-Power Tamper-Detection Circuit with Nonimprinting Memory
DS3655

Single-Chip Solution Provides Security, Tamper Detection, Encryption-Key Storage, and Encryption-Key Destruction in Event of Tamper
QV    NV SRAM Controller, RTC, and Supervisor with Tamper Detection
DS3650

Single-Chip Solution Provides Security, Tamper Detection, and Encryption-Key Destruction in Event of Tamper
QV    SPI™-Compatible Secure Supervisor with 1kB Nonimprinting Key Memory
DS3641

Single-Chip Solution Provides Security, Tamper-Detection, Encryption-Key Storage, and Encryption-Key Destruction in Event of Tamper
QV  PDF Accurate I²C RTC with Integrated TCXO/Crystal/FRAM
DS32B35, DS32C35

Nonvolatile Memory Has No Backup Supply and No Write Cycle Limits
QV    Secure Supervisor with 64B Nonimprinting, Battery-Backed Encryption Key SRAM
DS3600

Single-Chip Solution Provides Security, Tamper Detection, Encryption Key Storage, and Encryption Key Destruction in Event of Tamper
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 Parallel-Interface Elapsed Time Counter
DS1318

Subsecond Elapsed-Time Counter Offers 244µs Resolution
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 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 Y2K-Compliant Watchdog RTC with NV Control
DS1500




Key Specifications:   Non-Volatile RAM Controllers
Part Number CE Control Smart-Socket with Internal Battery Li Battery Monitor Power Fail Output Number of RAMs Controlled RESET Output Supply Voltage (V) Package Operating Temp. Range (°C)
DS1500  Yes No Yes No 1 Yes 3.3
5
TSOP/32 -40 to +85
See All Non-Volatile RAM Controllers (16)

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)
DS32B35  32.768kHz TCXO Digital CMOS Open-Drain 2 3.5 1 (typ) 5 (0-10 Years) 2.7 to 3.63
3.3
DS32C35  32.768kHz TCXO Digital CMOS Open-Drain 2 3.5 1 (typ) 5 (0-10 Years) 2.7 to 3.63
3.3
See All Oscillator Modules (26)

Key Specifications:   Secure Supervisors
Part Number Analog Voltages Monitored Digital Inputs Monitored Internal Key Memory (Bytes) External Memory Control Random Number Generator Over-Voltage Monitor Battery Monitor Operating Temp. Range (°C)
DS3650  2  -   -  No No Yes Yes -40 to +85
DS3600  4 1 64 Yes Yes No Yes -40 to +85
DS3641  5 3 1024 No Yes Yes Yes -40 to +85
DS3655   -  4 64 No No No No -40 to +85
See All Secure Supervisors (7)

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
DS1500 
NV SRAM Control
Watchdog Timekeeper
HH:MM:SS YY-MM-DD Bytewide 3.3
5
 -  12.5
6
NV SRAM 256 1
DS32B35   -  HH:MM:SS YY-MM-DD I2C 2.7 to 3.63
3.3
840  -  FRAM 2K
8K
 - 
DS32C35   -  HH:MM:SS YY-MM-DD I2C 2.7 to 3.63
3.3
840  -  FRAM 2K
8K
 - 
DS1390   -  HH:MM:SS:hh YY-MM-DD SPI 1.8
3
3.3
5
500 6 None  -  1
DS1391   -  HH:MM:SS:hh YY-MM-DD SPI 1.8
3
3.3
5
500 6 None  -  1
DS1392   -  HH:MM:SS:hh YY-MM-DD 3-Wire 1.8
3
3.3
5
500 6 None  -  1
DS1393   -  HH:MM:SS:hh YY-MM-DD 3-Wire 1.8
3
3.3
5
500 6 None  -  1
DS12CR887   -  HH:MM:SS YY-MM-DD Multiplexed 3.3
5
 -   -  NV SRAM 114 1
DS12R885   -  HH:MM:SS YY-MM-DD Multiplexed 3.3
5
800 12.5 NV SRAM 114 1
DS12R887   -  HH:MM:SS YY-MM-DD Multiplexed 3.3
5
 -   -  NV SRAM 114 1
DS1318 
Elapsed Time Counter
Binary Binary Bytewide 3.3 750 12.5 None  -  1
DS1340   -  HH:MM:SS YY-MM-DD I2C 1.8
3
3.3
5
800 12.5 None  -  0
DS1374 
Elapsed Time Counter
Watchdog Timekeeper
Binary Binary I2C 1.8
3
3.3
5
400 6 None  -  1
DS1338   -  HH:MM:SS YY-MM-DD I2C 1.8
3
3.3
5
800 12.5 NV SRAM 56 0
DS1339   -  HH:MM:SS YY-MM-DD I2C 2
3
3.3
5
400 6 None  -  2
DS1672 
Elapsed Time Counter
Binary Binary I2C 2
3
3.3
425 6 None  -  0
See All Timekeeping & Real-Time Clocks (86)




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