7.3 Device Functional Modes

The Function Tableand Latch Selection Table below list the functional modes of the CDx4HC(T)259.

Table 7-1. Function Table

INPUTS(1)

OUTPUT OF

ADDRESSED

LATCH(2)

EACH OTHER

OUTPUT(2)

FUNCTION

CLR

G

H

L

D

QiO

Addressable

latch

H

H

QiO

QiO

Memory

L

L

D

L

8-line

demultiplexer

L

H

L

L

Clear

(1)

H = High voltage level, L = Low voltage level

(2)

QiO = Previous output state of selected latch, D = Data input

logic value

Table 7-2. Latch Selection Table

SELECT INPUTS(1)

LATCH

ADDRESSED

S2

S1

S0

L

L

L

0

L

L

H

1

L

H

L

2

L

H

H

3

H

L

L

4

H

L

H

5

H

H

L

6

H

H

H

7

(1)

H = High Voltage Level, L = Low Voltage Level

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CD54HC259, CD74HC259, CD54HCT259, CD74HCT259

SCHS173D – NOVEMBER 1997 – REVISED NOVEMBER 2021

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