M48T86
5.0 V PC real-time clock
Not For New Design
Features
■
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
■
Clock accuracy better than ±1 minute per
month
■
Interfaced with software as 128 RAM locations:
– 14 bytes of clock and control registers
– 114 bytes of general purpose RAM
■
Three interrupts are separately softwaremaskable and testable
– Time-of-day alarm (once/second to
once/day)
– Periodic rates from 122 µs to 500 ms
– End-of-clock update cycle
1
PCDIP24 (PC)
Battery/Crystal
CAPHAT
uc
d
Selectable bus timing (Intel/Motorola)
■
24
te
le
so
Ob
-
■
Programmable square wave output
■
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 DS12887
SNAPHAT (SH)
Battery/Crystal
Self-contained battery and crystal in the
CAPHAT™ DIP package
■
ro
P
10 years of data retention and clock operation
in the absence of power
■
s)
t(
(s)
ct
du
o
Pr
e
28
1
let
o
SOH28 (MH)
bs
O
■
RoHS compliant
– Lead-free second level interconnect
December 2008
Rev 7
This is information on a product still in production but not recommended for new designs.
1/36
www.st.com
1
