74AHCT259 查看數據表（PDF） - Philips Electronics

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74AHCT259

8-bit addressable latch

Philips Electronics 

Philips Semiconductors

8-bit addressable latch

Product specification

74AHC259;

74AHCT259

FUNCTION TABLE

See note 1.

INPUTS

OUTPUTS

OPERATING MODE

MR LE D A0 A1 A2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7

reset

LHXXXX L

L

L

L

L

L

L

L

d L L L Q=d L

L

L

L

L

L

L

d H L L L Q=d L

L

L

L

L

L

demultiplexer

dLHL L

L Q=d L

L

L

L

L

(active HIGH

8-channel)

dHHL L

L

L Q=d L

L

L

L

LL

dLLH L

L

L

L Q=d L

L

L

decoder (when D = H)

dHLH L

L

L

L

L Q=d L

L

d LHH L

L

L

L

L

L Q=d L

dHHH L

L

L

L

L

L

L Q=d

memory (do nothing) H H X X X X q0 q1 q2 q3 q4 q5 q6 q7

d L L L Q = d q1

q2

q3

q4

q5

q6

q7

dHL L

q0 Q = d q2

q3

q4

q5

q6

q7

d LHL

q0

q1 Q = d q3

q4

q5

q6

q7

addressable latch

d HH L

HL

q0

q1

q2 Q = d q4

q5

q6

q7

d L L H q0

q1

q2

q3 Q = d q5

q6

q7

d H L H q0

q1

q2

q3

q4 Q = d q6

q7

d L H H q0

q1

q2

q3

q4

q5 Q = d q7

H H H H q0

q1

q2

q3

q4

q5

q6 Q = d

Note

1. H = HIGH voltage level;

L = LOW voltage level;

X = don’t care;

d = HIGH or LOW data one set-up time prior to the LOW-to-HIGH LE transition;

q = lower case letters indicate the state of the referenced output established during the last cycle in which it was

addressed or cleared.

ORDERING INFORMATION

TYPE NUMBER

74AHC259D

74AHC259PW

74AHCT259D

74AHCT259PW

TEMPERATURE

RANGE

−40 to +125 °C

PINS

16

16

16

16

PACKAGES

PACKAGE

SO

TSSOP

SO

TSSOP

MATERIAL

plastic

plastic

plastic

plastic

CODE

SOT109-1

SOT403-1

SOT109-1

SOT403-1

2000 Mar 14

4

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