Datasheet

5-2
FAST AND LS TTL DATA
SN54/74LS147 • SN54/74LS148 • SN54/74LS748
SN54/74LS147
FUNCTION TABLE
INPUTS OUTPUTS
1 2 3 4 5 6 7 8 9 D C B A
H H H H H H H H H H H H H
X XXXXXXXLLHHL
XXXXXXXLHLHHH
XXXXXXLHHHLLL
XXXXXLHHHHLLH
XXXXL HHHHHLHL
XX XLHHHHHHLHH
XX LHHHHHHHHLL
XL HHHHHHHHHLH
LHHHHHHHHHHHL
SN54/74LS148
SN54/74LS748
FUNCTION TABLE
INPUTS OUTPUTS
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
H X X X X X X X X H H H H H
L HHHHHHHH H HH H L
LXXXXXXXL L LL L H
LXXXXXXLH L LH L H
LXXXXXLHHL HL L H
LXXXXLHHHL HH L H
LX XXLHHHH H LL L H
LXXLHHHHH H LH L H
LX LHHHHHHH HL L H
LLHHHHHHHHHH L H
H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant
FUNCTIONAL BLOCK DIAGRAMS
SN54/74LS147 SN54/74LS148
1
2
3
4
5
6
7
8
9
(11)
(12)
(13)
(1)
(2)
(3)
(4)
(5)
(10)
(9)
(7)
(6)
(14)
A
B
C
D
0
1
2
3
4
5
6
7
EI
(10)
(11)
(12)
(13)
(1)
(2)
(3)
(4)
(5)
(15)
EO
(14)
GS
(8)
A0
(7)
A1
(6)
A2