Real-Time Clocks



Data Sheets
Part Number Description Key Advantages
MAX36025 DeepCover Security Manager for Tamper-Reactive Cryptographic-Node Control with AES Encryption

Advanced Physical Security and Hardware Encryption Provide Highest Level of Security and Encryption Key Protection 
MAX36051 DeepCover Security Manager with 128 Bytes of Nonimprinting Memory

Single-Chip Solution Integrates Advanced Physical Security to Protect Against Physical and Environmental Tamperings 
DS3644 DeepCover Security Manager with 1KB Secure Memory and Programmable Tamper Hierarchy

Tamper-Detection Hierarchy with On-Chip Nonimprinting Memory Safeguard Critical Data 
DS3655 DeepCover Security Manager with Ultra-Low-Power Tamper Detection and Nonimprinting Memory

Single-Chip Solution Integrates Advanced Physical Security to Protect Against Physical and Environmental Tamperings 
DS3650 DeepCover Security Manager with Thermal Tamper Detection

Single-Chip Solution Integrates Advanced Physical Security with On-Chip Encryption Key Destruction 
DS3641 DeepCover Security Manager with SPI-Compatible Interface and 1KB Nonimprinting Key Memory

Single-Chip Solution Integrates Advanced Physical Security to Protect Against Physical and Environmental Tamperings 
DS3640 DeepCover Security Manager with I²C Interface and 1KB Nonimprinting Battery-Backed Encryption Key SRAM

Single-Chip Solution Integrates Advanced Physical Security to Protect Against Physical and Environmental Tamperings 
DS1318 Parallel-Interface Elapsed Time Counter

Subsecond Elapsed-Time Counter Offers 244µs Resolution 
DS1340, DS1340C I²C RTC with Trickle Charger

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

 
DS1339, DS1339C, DS1339U I²C Serial Real-Time Clock

RTC Provides System Flexibility with Multiple Programmable Features 



Key Specifications:

Timekeeping & Real-Time Clocks
Part Number Interface VSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory Type Memory Size
(Bytes)
Time of Day Alarms Budgetary
Price
typ See Notes
DS1318  Bytewide 3.3 750 12.5 None - 1 $1.71 @1k
DS1340  I2C
1.8
3
3.3
5
800 12.5 None - 0 $1.39 @1k
DS1338  I2C
1.8
3
3.3
5
800 12.5 NV SRAM 56 0 $1.29 @1k
DS1339  I2C 1.8 to 5.5 400 6 None - 2 $1.46 @1k
See All Timekeeping & Real-Time Clocks (86)


Security Managers
Part Number Analog Voltages Monitored Digital Inputs Monitored Internal Key Memory
(Bytes)
Ext. Memory Cntrl. Random Number Gen. Over Voltage Monitor Battery Monitor Oper. Temp.
(°C)
MAX36025  4 2 1024 Yes Yes Yes Yes -55 to +95
MAX36051  2 0 128 No No Yes Yes -40 to +85
DS3644  4 2 1024 Yes Yes Yes Yes -55 to +95
DS3655  - 4 64 No No No No -40 to +85
DS3650  2 - - No No Yes Yes -40 to +85
DS3640  5 3 1024 No Yes Yes Yes -40 to +85
DS3641  5 3 1024 No Yes Yes Yes -40 to +85
See All Security Managers (11)