(DS1688 / DS1691) 3 Volt/5 Volt Serialized Real Time Clock
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DS1688/DS1691
DS1688/DS1691 3 Volt/5 Volt Serialized Real Time Clock with NV RAM Control
FEATURES...
Description
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DS1688/DS1691
DS1688/DS1691 3 Volt/5 Volt Serialized Real Time Clock with NV RAM Control
FEATURES
Incorporates industry standard DS1287 PC clock plus enhanced features:
PIN ASSIGNMENT
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 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
+3
or +5 volt operation
64–bit Silicon serial number 64–bit
customer specific ROM or additional serial number available control circuitry supports system power on from date/time alarm or key closure battery backup and write protection to external SRAM 12.5 pF crystal
Power
Automatic
Crystal select bit allows RTC to operate with 6 pF or 114 bytes user NVRAM 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 Compatible with
functions existing BIOS for original DS1287
DS1688 28–PIN DIP (600 MIL) 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
DS1688S 28–PIN SOIC (330 MIL) CEI CEO VCCI VCCO SQW NC IRQ PSEL RD NC WR ALE CS KS
DS1691 28–PIN E...
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