SM8577B
OVERVIEW
The SM8577B is a CMOS serial-interface type realtime clock IC that operates at 32.768 k Hz. 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 k Hz or 1 Hz output frequency. It is available in 8-pin SOPs.
PINOUT
CE DATA CLK FOUT
VDD XTN XT VSS
8577B
FEATURES s s s s s
5 s s s s s
2.5 to 5.5 V operating voltage range 1.0 µA at 3.0 V (typ) current consumption 3-line serial interface 1.7 ± 0.3 V supply voltage detection threshold Timer counters for second, minute, hour, day, day of the week, month, and year Automatic leap-year calendar adjustment 32.768 k Hz and 1 Hz output interrupt selectable Crystal oscillator circuit built-in (CD built-in) 24-hour time mode 8-pin SOP
PACKAGE DIMENSIONS
Unit: mm
8-pin SOP
0.15- 0.05
+ 0.10
4.4 0.2 6.2 0.3
5.2 0.3
0 to 10∞
ORDERING INFOMATION
Device SM8577BS Package 8pin SOP
0.4...
