HD74LS190 Datasheet, PDF(6/11 Page) Hitachi Semiconductor – Synchronous Up/Down Decade Counters(single clock line)

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HD74LS190 Datasheet, PDF (6/11 Pages) Hitachi Semiconductor – Synchronous Up/Down Decade Counters(single clock line)

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HD74LS190

Count Sequences

Load

Clock

Down/Up

Enable G

Max/Min

Ripple

Clock

7 8 9 0 12

22 1 0 9 8 7

Load

Count Up

Inhibit

Count Down

Illustrated below is the following sequence:

1. Load (preset) to BCD seven.

2. Count up to eight, nine (maximum), zero, one and two.

3. Inhibit

4. Count down to one, zero (minimum), nine, eight, and seven.

Rev.3.00, Jul.15.2005, page 6 of 10

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