74HC297 Ver la hoja de datos (PDF) - Philips Electronics

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74HC297

Digital phase-locked-loop filter

Philips Electronics 

Philips Semiconductors

Digital phase-locked-loop filter

Product specification

74HC/HCT297

Fig.4 Functional diagram.

K-COUNTER (DIGITAL CONTROL) FUNCTION TABLE

D

C

B

A

MODULO (K)

L

L

L

L

L

L

L

H

L

L

H

L

L

L

H

H

L

H

L

L

L

H

L

H

L

H

H

L

L

H

H

H

H

L

L

L

H

L

L

H

H

L

H

L

H

L

H

H

H

H

L

L

H

H

L

H

H

H

H

L

H

H

H

H

inhibited

23

24

25

26

27

28

29

210

211

212

213

214

215

216

217

EXCLUSIVE-OR PHASE DETECTOR FUNCTION

TABLE

φA1

φB

L

L

L

H

H

L

H

H

XORPDOUT

L

H

H

L

EDGE-CONTROLLED PHASE DETECTOR TABLE

φA2

H or L

↓

H or L

↑

φB

↓

H or L

↑

H or L

ECPDOUT

H

L

no change

no change

Notes

1. H = HIGH voltage level

L = LOW voltage level

↓ = HIGH-to-LOW transition

↑ = LOW-to-HIGH transition

September 1993

5

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