PI74LPT543A 查看數據表（PDF） - Pericom Semiconductor
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PI74LPT543A Datasheet PDF : 5 Pages
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PI74LPT543
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Product Pin Configuration
LEBA
OEBA
A0
A1
A2
A3
A4
A5
A6
A7
CEAB
GND
1
24
2
23
3
22
4 24-PIN 21
5 L24 20
6 Q24 19
7 R24 18
S24
8
17
9
16
10
15
11
14
12
13
VCC
CEBA
B0
B1
B2
B3
B4
B5
B6
B7
LEAB
OEAB
Product Pin Description
Pin Name
OEAB
OEBA
CEAB
CEBA
LEAB
LEBA
A0-A7
B0-B7
GND
VCC
Description
A-to-B Output Enable Input (Active LOW)
B-to-A Output Enable Input (Active LOW)
A-to-B Enable Input (Active LOW)
B-to-A Enable Input (Active LOW)
A-to-B Latch Enable Input (Active LOW)
B-to-A Latch Enable Input (Active LOW)
A-to-B Data Inputs or B-to-A 3-State Outputs
B-to-A Data Inputs or A-to-B 3-State Outputs
Ground
Power
Truth Table (Non-Inverting)(1,2)
For A-to-B (Symmetric with B-to-A)
Inputs
Latch
Status
CEAB LEAB OEAB
A-to-B
Output
Buffers
B0–B7
H
X
X
Storing
High-Z
X
H
X
Storing
X
X
X
H
X
High Z
L
L
L
Transparent
Current A Inputs
L
H
L
Storing
Previous* A Inputs
Notes:
1. *Before LEAB LOW-to-HIGH Transition
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care or Irrevelant
2. A-to-B data flow shown; B-to-A flow control is the same,
except using CEBA, LEBA, and OEBA.
2
PS2062A 01/15/97
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