(China (Mainland))
Product Summary
The UPD4990AC is a CMOS LSI developed to input/output calendar & clock data serially to/from the micro computer. The crystal frequency of the UPD4990AC is 32.768 kHz and the data items included are time, minute, second, year, month, day, and week.
Parametrics
UPD4990AC absolute maximum ratings: (1) Supply Voltage VDD-VSS: -0.5 to 7V; (2) Input votlage VIN: VSS -0.3 to VDD +0.3V; (3) Operating Temperature Range Topt: -40 to +85°C; (4) Storage Temperature Range Tstg: -65 to +125°C; (5) Output Terminal Voltage VOUT: -0.5 to 7.0V.
Features
UPD4990AC features: (1) Built-in counters for time (hour, minute, and second) and date (year, month, day, and week) ; (2) Leap years are adjusted automatically; (3) Data is represented in BCD notation (except months in hexadecimal notation) and input/output serially; (4) Commands can be set by inputting serial data; (5) Selective timing pulses (TPs) are 64 Hz, 256 Hz, 2 048 Hz, and 4 096 Hz and selective output intervals are 1, 10, 30, and 60 seconds.
Diagrams
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