UPD4991A - 4-BIT PARALLEL I/O CALENDAR CLOCK

NEC

The UPD4991A by NEC is a 4-BIT PARALLEL I/O CALENDAR CLOCK. Below is the official datasheet preview.

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UPD4991A 4-BIT PARALLEL I/O CALENDAR CLOCK by NEC - Datasheet Preview — Official preview page of the **UPD4991A** 4-BIT PARALLEL I/O CALENDAR CLOCK datasheet (NEC).

Datasheet Details

Part number	UPD4991A
Manufacturer	NEC
File Size	133.55 KB
Description	4-BIT PARALLEL I/O CALENDAR CLOCK
Datasheet	UPD4991A_NEC.pdf
Additional preview pages of the UPD4991A datasheet.

UPD4991A Product details

Description

1. 0 0 B) 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). If leap year identification function is not used, the last day of February is always the 28th.

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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Published: Apr 17, 2005 |