DS1691 Datasheet

DS1691 (DS1688 / DS1691) 3 Volt/5 Volt Serialized Real Time Clock

X1 X2 RCLR AD0-AD7 PWR KS CS ALE WR RD VCCO – – – – – – – – – – – Crystal Input Crystal Output RAM Clear Input Mux’ed Address/Data Bus Power–on Interrupt Output Kickstart Input RTC Chip Select Input RTC Address Strobe RTC Write Data Strobe RTC Read Data Strobe RAM Power Supply Output • Timekeeping .

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 .