74ABT544 Datasheet, PDF (5/19 Pages) NXP Semiconductors – Octal latched transceiver with dual enable, inverting 3-State

Philips Semiconductors
74ABT544
Octal latched transceiver with dual enable; inverting; 3-state
Table 3:
Symbol
B3
B2
B1
B0
EBA
V_CC
Pin description …continued
Pin
Description
19
port B, 3-state output 3
20
port B, 3-state output 2
21
port B, 3-state output 1
22
port B, 3-state output 0
23
B-to-A enable input (active LOW)
24
supply voltage
7. Functional description
7.1 Function table
Table 4: Function table ^[1]
Status
Control
OExx
Exx
Disabled
H
X
X
H
Disabled + latch L
↑
Latch + display L
L
Transparent
L
L
Hold
L
L
LExx
X
X
L
↑
L
H
Input
An or Bn
X
X
h
l
h
l
H
L
X
[1] H = HIGH voltage level;
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition;
L = LOW voltage level;
l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition;
X = don’t care;
↑ = LOW-to-HIGH clock transition;
NC = no change;
Z = high-impedance OFF-state.
Output
An or Bn
Z
Z
Z
Z
L
H
L
H
NC
9397 750 14756
Product data sheet
Rev. 03 — 20 April 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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