74LVC544 查看數據表（PDF） - Philips Electronics
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74LVC544 Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal D-type registered transceiver, inverting
(3-State)
Product specification
74LVC544A
PIN DESCRIPTION
PIN NUMBER SYMBOL
1
LEBA
2
OEBA
3, 4, 5, 6,
7, 8, 9, 10
11
12
22, 21, 20, 19,
18, 17, 16, 15
A0–A7
EBA
GND
B0–B7
13
OEAB
14
LEAB
23
EAB
24
VCC
FUNCTION
‘B’ to ‘A’ latch enable input (active
LOW)
‘B’ to ‘A’ output enable input (active
LOW)
‘A’ data inputs/outputs
‘B’ to ‘A’ enable input (active LOW)
Ground (0V)
‘B’ data inputs/outputs
‘A’ to ‘B’ output enable input (active
LOW)
‘A’ to ‘B’ latch enable input (active
LOW)
‘A’ to ‘B’ enable input (active LOW)
Positive supply voltage
PIN CONFIGURATION
LEBA 1
OEBA 2
A0 3
A1 4
A2 5
A3 6
A4 7
A5 8
A6 9
A7 10
EAB 11
GND 12
24 VCC
23 EBA
22 B0
21 B1
20 B2
19 B3
18 B4
17 B5
16 B6
15 B7
14 LEAB
13 OEAB
SV00733
FUNCTION TABLE
OEXX
EXX
INPUTS
LEXX
DATA
OUTPUTS
H
X
X
X
Z
X
H
X
X
Z
L
↑
L
h
Z
L
↑
L
l
Z
L
L
↑
h
L
L
L
↑
l
H
L
L
L
H
L
L
L
L
L
H
L
L
H
X
NC
XX = AB for A-to-B direction, BA for B-to-A direction
H = HIGH voltage level
L = LOW voltage level
h = HIGH state must be present one set-up time before the LOW-to-HIGH transition of LEAB, LEBA, EAB, EBA
l
= LOW state must be present one set-up time before the LOW-to-HIGH transition of LEAB, LEBA, EAB, EBA
X = Don’t care
↑ = LOW–to–HIGH level transition
NC = No change
Z = High impedance OFF-state
STATUS
Disabled
Disabled
Disabled + Latch
Latch + Display
Transparent
Hold
1998 Jul 29
3
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