| Part number | UPD4990A |
|---|---|
| Download | UPD4990A Datasheet (PDF) |
| File Size | 129.98 KB |
| Manufacturer | NEC |
| Description | SERIAL I/O CALENDAR & CLOCK CMOS LSI |
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| Part Number | Description |
|---|---|
| UPD4991A | 4-BIT PARALLEL I/O CALENDAR CLOCK |
| UPD4992 | 8-Bit Parallel I/O Calendar Clock |
| UPD4016 | 2048 x 8 Bit Static NMOS RAM |
| UPD4066B | Quad Bilateral Switch |
| UPD4104 | 4096 x 1 STATIC NMOS RAM |
DATA SHEET MOS INTEGRATED CIRCUIT µPD4990A SERIAL I/O CALENDAR & CLOCK CMOS LSI The µPD4990A is a CMOS LSI developed to input/output calendar & clock data serially to/from the micro puter. The crystal frequency is 32.768 kHz and the data items included are time, minute, second, year, month, day, and week.
