74F240A Просмотр технического описания (PDF) - Philips Electronics
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74F240A Datasheet PDF : 12 Pages
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Philips Semiconductors
Buffers
Product specification
74F240/74F240A/
74F241/74F241A
PIN CONFIGURATION FOR 74F240/74F240A
OEa 1
Ia0 2
Yb0 3
Ia1 4
Yb1 5
Ia2 6
Yb2 7
Ia3 8
Yb3 9
GND 10
20 VCC
19 OEb
18 Ya0
17 Ib0
16 Ya1
15 Ib1
14 Ya2
13 Ib2
12 Ya3
11 Ib3
SF00320
IEC/IEEE SYMBOL FOR 74F240/74F240A
1
EN1
19
EN2
2
2D
1
18
4
16
6
14
8
12
17
2
3
15
5
13
7
11
9
SF00322
LOGIC SYMBOL FOR 74F240/74F240A
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
1
OEa
19
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
VCC = Pin 20
GND = Pin 10
18 16 14 12 3 5 7 9
SF00321
FUNCTION TABLE FOR 74F240/74F240A
INPUTS
OUTPUTS
OEa
Ia
OEb
Ib
Ya
Yb
L
L
L
L
H
H
L
H
L
H
L
L
H
X
H
X
Z
Z
Notes to function table for 74F240/74F240A
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
LOGIC DIAGRAM FOR 74F240/74F240A
2
Ia0
18
Ya0
17
Ib0
3
Yb0
4
Ia1
16
Ya1
15
Ib1
5
Yb1
6
Ia2
8
Ia3
14
Ya2
12
Ya3
13
Ib2
11
Ib3
7
Yb2
9
Yb3
OEa 1
OEb 10
VCC = Pin 20
GND = Pin 10
SF00323
January 2, 1991
3
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