DESCRIPTION

The MSM62X42B is a bus-connection Micro computer peripheral IC of a Real Time Clock with built-in crystal in the perpetual calendar which can be read and written from a second unit. The interface between this IC and a microcomputer uses 4 data buses, 4 address buses, 3 control buses and 2 chip selects and carries out setting up, amending and reading time.

FEATURES

? 32.768kHz built-in crystal oscillator

(2 ranks of ±10PPM and ±50PPM ---DIP)

(2 ranks of ±20PPM and ±50PPM ---SOP)

? Real time clock of second, minute, date,month, year and day of week

? Interface corresponding to microcomputer bus

? 30-second compensation controlled by software

? Periodical interrupt function (or periodical waveform output) for alarm

? STOP/START function for clock

? 12/24 hour selectable

? AEL input for 8048 system, 8051 system or 8085 system (when a microcomputer does not provide the ALE output, fix the AEL input at H.)

? Low current consumption for CMOS device

? Low STANDBY voltage and small STANDBY current

? 18-pin plastic DIP(DIP18-P-300)

? 24-pin plastic SOP