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74HC148 Datasheet

8-to-3-line Octal Priority Encoder

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HD74HC148
8-to-3-line Octal Priority Encoder
Description
The HD74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable
input EI and enable output EO) is provided to allow octal expansion without the need for external circuitry.
The data inputs and outputs are active at the low logic level.
Features
High Speed Operation: tpd (0 - 7 to A0 - A2) = 15 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Outputs
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
HX X X X X X X X H H H H H
LH H H H H H H H H H H H L
LX X X X X X X L L L L L H
LX X X X X X L H L L H L H
LX X X X X L H H L H L L H
LX X X X L H H H L H H L H
LX X X L H H H H H L L L H
LX X L H H H H H H L H L H
LX L H H H H H H H H L L H
LL H H H H H H H H H H L H
H : High level
L : Low level
X : Irrelevant
Hitachi
Hitachi



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