DS1691
3 Volt/5 Volt Serialized Real-Time Clock with NV RAM Control
Part Details
- +3 or +5V operation
- 64-bit Silicon serial number
- 64-bit customer specific ROM or additional serial number available
- Power control circuitry supports system power on from date/time alarm or key closure
- Automatic battery backup and write protection to external SRAM
- Crystal select bit allows RTC to operate with
- 6pF or 12.5pF crystal
- 114 bytes user NV RAM
- Auxiliary battery input
- RAM clear input
- Century register
- 32kHz output for power management
- 32-bit VCC powered elapsed time counter
- 32-bit VBAT powered elapsed time counter
- 16-bit power cycle counter
- Compatible with existing BIOS for original DS1287 functions
- Available as IC (DS1688) or stand-alone module with embedded battery and crystal (DS1691)
- Timekeeping algorithm includes leap year compensation valid up to 2100
The DS1688/DS1691 is a real-time clock (RTC) designed as a successor to the industry standard DS1285, DS1385, DS1485, and DS1585 PC real time clocks. This device provides the industry standard DS1285 clock function with the new feature of either +3.0 or +5.0V operation and automatic backup and write protection to an external SRAM. The DS1688 also incorporates a number of enhanced features including a silicon serial number, power on/off control circuitry, 114 bytes of user NV SRAM, power on elapsed timer, and power cycle counter.
Documentation
Data Sheet 1
Reliability Data 1
Application Note 1
This is the most up-to-date revision of the Data Sheet.
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