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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 Cntrl. Smart Socket w/Int. Batt. Li Batt. Monitor Pwr. Fail Out RAMs Controlled Reset Out VSUPPLY
(V)
RoHS Available Package/Pins Smallest Available Pckg.
(mm2)
Oper. Temp.
(°C)
max w/pins
DS1500  Yes No Yes No 1 Yes
3.3
5
Yes
TSOP/32
168 -40 to +85
See All Non-Volatile RAM Controllers (13)

Key Specifications:  Oscillator Modules
Part Number Freq. Osc. Type Tuning Adjustment Type Freq. Output Type Frequency Stability
(±ppm/yr)
Frequency Stability
(±ppm/yr)
Frequency Stability
(±ppm/yr)
Frequency Stability
(±ppm)
VSUPPLY
(V)
0 to +40°C -40 to 0°C/ +40 to +85°C vs. VCC vs. Aging
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 
See All Oscillator Modules (28)

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
DS32B35  - YY-MM-DD/ HH:MM:SS I2C
2.7 to 3.63
3.3
840 - FRAM
2K
8K
-
DS32C35  - YY-MM-DD/ HH:MM:SS I2C
2.7 to 3.63
3.3
840 - FRAM
2K
8K
-
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
DS1318  Elapsed Time Counter Binary Bytewide 3.3 750 12.5 None - 1
DS1340  - YY-MM-DD/ HH:MM:SS I2C
1.8
3
3.3
5
800 12.5 None - 0
DS1374 
Elapsed Time Counter
Watchdog Timekeeper
Binary I2C
1.8
3
3.3
5
400 6 None - 1
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
DS1500 
NV SRAM Control
Watchdog Timekeeper
YY-MM-DD/ HH:MM:SS Bytewide
3.3
5
-
6
12.5
NV SRAM 256 1
DS1672  Elapsed Time Counter Binary I2C
2
3
3.3
425 6 None - 0
See All Timekeeping & Real-Time Clocks (80)

Key Specifications:  Secure Supervisors
Part Number Analog Voltages Monitored Digital Inputs Monitored Internal Key Memory
(Bytes)
Ext. Memory Cntrl. Random Number Gen. Over Voltage Monitor Battery Monitor RoHS Available Package/Pins Smallest Available Pckg.
(mm2)
Oper. Temp.
(°C)
max w/pins
DS3655  - 4 64 No No No No Yes
CSBGA/16
16 -40 to +85
DS3650  2 - - No No Yes Yes
CSBGA/16
16
DS3600  4 1 64 Yes Yes No Yes
CSBGA/25
25
DS3641  5 3 1024 No Yes Yes Yes
CSBGA/25
25
See All Secure Supervisors (7)



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