DS1691
3V/5V、串行实时时钟，带有NV RAM控制器
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产品详情
Incorporates industry standard DS1287 PC clock plus enhanced features:
- +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
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