74F569 데이터 시트보기 (PDF) - Fairchild Semiconductor

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74F569

4-Bit Bidirectional Counter with 3-STATE Outputs

Fairchild Semiconductor 

CC Truth Table

Inputs

Output

SR PE CEP CET TC CP CC

(Note 1)

LXXX

X

X

H

X L XX

X

X

H

XXHX

X

X

H

XXXH

X

X

H

XXXX

HHL L

H

X

H

L

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

= HIGH-to-LOW-to-HIGH Clock Transition

Note 1: TC is generated internally

Mode Select Table

Inputs

Operating

MR SR PE CEP CET U/D

Mode

L X X X X X Asynchronous Reset

H L X X X X Synchronous Reset

H H L X X X Parallel Load

H H H H X X Hold

H H H X H X Hold

H H H L L H Count Up

H H H L L L Count Down

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

FIGURE 1. Multistage Counter with Ripple Carry

State Diagram

FIGURE 2. Multistage Counter with Lookahead Carry

3

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