74F640 查看數據表（PDF） - Philips Electronics
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74F640 Datasheet PDF : 11 Pages
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Philips Semiconductors
Octal bus transceiver, inverting (3-State)
Product specification
74F640
LOGIC SYMBOL
23 4 56 7 89
A0 A1 A2 A3 A4 A5 A6 A7
19
OE
1
T/R
B0 B1 B2 B3 B4 B5 B6 B7
VCC = Pin 20
GND = Pin 10
18 17 16 15 14 13 12 11
SF01140
FUNCTION TABLE
INPUTS
OE
T/R
L
L
L
H
H
X
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
LOGIC DIAGRAM
OUTPUTS
Bus B data to Bus A
Bus A data to Bus B
Z
A0
A1
A2
2
3
4
LOGIC SYMBOL (IEEE/IEC)
19
G3
3EN1(BA)
1
3EN2(AB)
1
2
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
SF01141
A3
A4
A5
A6
A7
5
6
7
8
9
OE 19
T/R 1
VCC = Pin 20
GND = Pin 10
1989 Nov 27
18
17
B0
B1
16
B2
15
B3
14
B4
13
12
11
B5
B6
B7 SF01142
3
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