DS12B887 Overview
AD0-AD7 NC CS AS R/W DS IRQ SQW VCC GND RCLR Multiplexed Address/Data Bus No Connection Chip Select Address Strobe Read/Write Input Data Strobe Interrupt Request Output Square Wave Output +5 Volt Supply Ground RAM Clear Programmable square wave output signal Bus-patible interrupt signals (IRQ) Three interrupts are separately software-maskable and testable Time-of-day alarm once/second to once/day Periodic rates from...
DS12B887 Key Features
- Drop-in replacement for IBM AT puter clock/calendar
- Pin patible with the MC146818B and DS1287
- Self-contained
- Counts
- Binary or BCD representation of time, calendar, and
- 12- or 24-hour clock with AM and PM in 12-hour mode
- Daylight Savings Time option
- Multiplex bus for pin efficiency
- Interfaced with software as 128 RAM locations
- 14 bytes of clock and control registers