74F621 查看數據表（PDF） - Philips Electronics
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74F621 Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal bus transceiver, non-inverting (open collector)
Product specification
74F621
LOGIC SYMBOL
23 4 56 7 89
A0 A1 A2 A3 A4 A5 A6 A7
1
OEAB
19
OEBA
B0 B1 B2 B3 B4 B5 B6 B7
VCC = Pin 20
GND = Pin 10
18 17 16 15 14 13 12 11
SF01126
LOGIC DIAGRAM
19
OEBA
OEAB 1
A0 2
A1 3
A2 4
A3 5
A4 6
A5 7
A6 8
A7 9
VCC = Pin 20
GND = Pin 10
18 B0
17 B1
16
B2
15 B3
14 B4
13
B5
12 B6
11 B7
SF01130
LOGIC SYMBOL (IEEE/IEC)
19
EN1
1
EN2
2
1
18
2
3
17
4
16
5
15
6
14
7
13
8
12
9
11
SF01137
FUNCTION TABLE
INPUTS
OEBA
OEAB
OPERATING MODES
L
L
B data to A bus
H
H
A data to B bus
H
L
OFF
L
H
B data to A bus
A data to B bus
H = High voltage level
L = Low voltage level
X = Don’t care
OFF= High if pull-up resistor is connected to open collector output
1996 Jan 05
3
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