M48T86 Datasheet, PDF (1/23 Pages) STMicroelectronics – 5V PC REAL TIME CLOCK

M48T86
5V PC REAL TIME CLOCK
s DROP-IN REPLACEMENT for PC
COMPUTER CLOCK/CALENDAR
s COUNTS SECONDS, MINUTES, HOURS,
DAYS, DAY of the WEEK, DATE, MONTH and
YEAR with LEAP YEAR COMPENSATION
s INTERFACED WITH SOFTWARE AS 128
RAM LOCATIONS:
– 14 Bytes of Clock and Control Registers
– 114 Bytes of General Purpose RAM
s SELECTABLE BUS TIMING (Intel/Motorola)
s 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
s PROGRAMMABLE SQUARE WAVE OUTPUT
s SELF-CONTAINED BATTERY and CRYSTAL
in the CAPHAT DIP PACKAGE
s PACKAGING INCLUDES a 28-LEAD SOIC
and SNAPHAT^® TOP
(to be Ordered Separately)
s SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT TOP
CONTAINS the BATTERY and CRYSTAL
s PIN and FUNCTION COMPATIBLE with
bq3285/7A and DS128887
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)
24
1
PCDIP24 (PC)
Battery/Crystal
CAPHAT
Figure 1. Logic Diagram
VCC
8
AD0-AD7
E
R/W
DS
AS
RST
RCL
MOT
M48T86
SQW
IRQ
VSS
AI01640
May 2000
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