DS1689 Datasheet Text
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DS1689/DS1693
3-Volt/5-Volt Serialized Real-Time Clock with NV RAM Control
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Features
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 6 pF or 12.5 pF crystal
- 114 bytes user NV RAM
- Auxiliary battery input
- RAM clear input
- Century register
- 32 kHz output for power management
- 32-bit VCC powered elapsed time counter
- 32-bit VBAT powered elapsed time counter
- 16-bit power cycle counter
- patible with existing BIOS for original DS1287 functions
- Available as IC (DS1689) or standalone module with embedded battery and crystal (DS1693)
- IC is available in industrial temperature version
- Timekeeping algorithm includes leap year pensation valid up to 2100
PIN ASSIGNMENT
VBAUX NC NC RCLR AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 PWR GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 CEI CEO VCCI VCCO SQW NC IRQ PSEL RD NC WR ALE CS KS VBAUX X1 X2 RCLR AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 PWR GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 CEI CEO VCCI VCCO SQW VBAT IRQ PSEL RD GND WR ALE CS KS
DS1693 28-Pin Encapsulated Package DS1689S 28-Pin SOIC (740-mil) (330-mil)
PIN DESCRIPTION
X1 X2...