74HC643 查看數據表（PDF） - Philips Electronics
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74HC643 Datasheet PDF : 6 Pages
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Philips Semiconductors
Octal bus transceiver; 3-state;
true/inverting
PIN DESCRIPTION
PIN NO.
SYMBOL NAME AND FUNCTION
1
DIR
direction control
2, 3, 4, 5, 6, 7, 8, 9
10
A0 to A7 data inputs/outputs
GND
ground (0 V)
18, 17, 16, 15, 14, 13, 12, 11 B0 to B7 data inputs/outputs
19
OE
output enable input (active LOW)
20
VCC
positive supply voltage
Product specification
74HC/HCT643
Fig.1 Pin configuration.
Fig.2 Logic symbol.
FUNCTION TABLE
INPUTS
OE DIR
L
L
L
H
HX
INPUTS/OUTPUTS
An
A=B
inputs
Z
Bn
inputs
B=A
Z
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
Fig.3 IEC logic symbol.
December 1990
Fig.4 Functional diagram.
3
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