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HD74HC147 Datasheet

  • HD74HC147

  • 10-to-4-line Priority Encoder

  • 8頁(yè)

  • HITACHI

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HD74HC147
10-to-4-line Priority Encoder
Description
The HD74HC147 features priority encoding of the inputs to ensure that only the highest order data line is
encoded. Nine input lines are encoded to a four line BCD output. The implied decimal zero codition
requires no input condition as zero is encoded when all nine data lines are at a high logic level. All data
inputs and outputs are active at the low logic level.
Features
鈥?/div>
High Speed Operation: t
pd
= 14.5 ns typ (C
L
= 50 pF)
鈥?/div>
High Output Current: Fanout of 10 LSTTL Loads
鈥?/div>
Wide Operating Voltage: V
CC
= 2 to 6 V
鈥?/div>
Low Input Current: 1 碌A(chǔ) max
鈥?/div>
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
Inputs
1
H
X
X
X
X
X
X
X
X
L
2
H
X
X
X
X
X
X
X
L
H
3
H
X
X
X
X
X
X
L
H
H
4
H
X
X
X
X
X
L
H
H
H
5
H
X
X
X
X
L
H
H
H
H
6
H
X
X
X
L
H
H
H
H
H
7
H
X
X
L
H
H
H
H
H
H
8
H
X
L
H
H
H
H
H
H
H
9
H
L
H
H
H
H
H
H
H
H
Outputs
D
H
L
L
H
H
H
H
H
H
H
C
H
H
H
L
L
L
L
H
H
H
B
H
H
H
L
L
H
H
L
L
H
A
H
L
H
L
H
L
H
L
H
L

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