DESCRIPTION
The M48T86 is an industry standard real time clock (RTC).The M48T86 is composed of a lithium energy source, quartz crystal, write-protection circuitry, and a 128 byte RAM array. This provides the user with a complete subsystem packaged in either a 24-pin DIP CAPHAT or 28-pin SNAPHAT SOIC. Functions available to the user include a non-volatile time-of-day clock, alarm interrupts, a one-hundred-year clock with programmable interrupts, square wave output, and 128 bytes of nonvolatile static RAM.

■ DROP-IN REPLACEMENT for PC COMPUTER CLOCK/CALENDAR
■ COUNTS SECONDS, MINUTES, HOURS, DAYS, DAY of the WEEK, DATE, MONTH and YEAR with LEAP YEAR COMPENSATION
■ INTERFACED WITH SOFTWARE AS 128 RAM LOCATIONS: – 14 Bytes of Clock and Control Registers – 114 Bytes of General Purpose RAM
■ SELECTABLE BUS TIMING (Intel/Motorola)
■ THREE INTERRUPTS are SEPARATELY SOFTWARE-MASKABLE and TESTABLE
   – Time-of-Day Alarm (Once/Second to Once/Day)
   – Periodic Rates from 122µs to 500ms
   – End-of-Clock Update Cycle
■ PROGRAMMABLE SQUARE WAVE OUTPUT
■ SELF-CONTAINED BATTERY and CRYSTAL in the CAPHAT DIP PACKAGE
■ PACKAGING INCLUDES a 28-LEAD SOIC and SNAPHAT® TOP (to be Ordered Separately)
■ SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT TOP CONTAINS the BATTERY and CRYSTAL
■ PIN and FUNCTION COMPATIBLE with bq3285/7A and DS128887