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    D1990a

    Abstract: PPD4990AC
    Text: DATA SHEET SEC MOS INTEGRATED CIRCUtT ELECTRON DEVICE /¿PD4990A SERIAL I/O CALENDAR & CLOCK C M O S LSI The /xPD4990A is a CM OS LSI developed to input/output calendar & clock data serially to /fro m the micro com­ puter. The crystal frequency ¡5 3 2.768 kH z and the data items included are tim e, minute, second, year, m onth, day,


    OCR Scan     		PDF uPD4990A /xPD4990A 16PIN PD4990A 016-o 1C--1755 1989P D1990a PPD4990AC