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UPD4991A - 4-BIT PARALLEL I/O CALENDAR CLOCK

Datasheet Summary

Description

1.

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Thirteen types of counters are provided: 10-year, 1-year, 10-month, 1-month, 10-day, 1-day, date, 10-hour, 1hour, 10-minute, 1-minute, 10-second, and 1-second.

Date codes are 00H through 06H (0000 through 0110B).

Features

  • Time (hour, minute, and second) and calendar (leap year, year, month, day, and date) counters.
  • Leap year can be automatically identified or set.
  • 12- and 24-hour modes selectable.
  • 4-bit parallel input/output in BCD data format.
  • Alarm function (hour, minute, second, month, day, date).
  • One of 0.1, 1.0, 10, 30, and 60-s interval timer outputs selectable.
  • One of 2048, 1024, 64, 16, 1 Hz, 1-pulse output, and H→L output selectable as alar.

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Datasheet preview – UPD4991A

Datasheet Details

Part number UPD4991A
Manufacturer NEC
File Size 133.55 KB
Description 4-BIT PARALLEL I/O CALENDAR CLOCK
Datasheet download datasheet UPD4991A Datasheet
Additional preview pages of the UPD4991A datasheet.

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Full PDF Text Transcription

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DATA SHEET MOS INTEGRATED CIRCUIT µPD4991A 4-BIT PARALLEL I/O CALENDAR CLOCK The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar data to/from a microcomputer and includes an alarm function. Its reference oscillation frequency is 32.768 kHz. Hour, minute, second, year, month, day, and date data is stored internally. The µPD4991A consumes 30 % less power than the µPD4991. FEATURES: • Time (hour, minute, and second) and calendar (leap year, year, month, day, and date) counters • Leap year can be automatically identified or set • 12- and 24-hour modes selectable • 4-bit parallel input/output in BCD data format • Alarm function (hour, minute, second, month, day, date) • One of 0.1, 1.
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