SM8577B Datasheet, PDF (1/10 Pages) Nippon Precision Circuits Inc – Real-time Clock IC

NIPPON PRECISION CIRCUITS INC.
SM8577B
Real-time Clock IC
OVERVIEW
The SM8577B is a CMOS serial-interface type real-
time clock IC that operates at 32.768 kHz. It
employs a 3-line serial interface to transfer time and
date data. It incorporates a supply-voltage detect
function to determine data validity/invalidity. It
features an output interrupt with 32 kHz or 1 Hz
output frequency. It is available in 8-pin SOPs.
FEATURES
s 2.5 to 5.5 V operating voltage range
s 1.0 µA at 3.0 V (typ) current consumption
s 3-line serial interface
s 1.7 ± 0.3 V supply voltage detection threshold
s Timer counters for second, minute, hour, day, day
of the week, month, and year
s Automatic leap-year calendar adjustment
s 32.768 kHz and 1 Hz output interrupt selectable
s Crystal oscillator circuit built-in (C_D built-in)
s 24-hour time mode
s 8-pin SOP
PINOUT
CE 1
8
DATA
CLK
FOUT 4
5
PACKAGE DIMENSIONS
Unit: mm
8-pin SOP
VDD
XTN
XT
VSS
+
0.15−
0.10
0.05
ORDERING INFOMATION
Device
SM8577BS
Package
8pin SOP
5.2 0.3
1.27
0.4 0.1
0 to 10∞
NIPPON PRECISION CIRCUITS—1