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74HCT147

10-to-4 line priority encoder

Philips Electronics 

Philips Semiconductors

10-to-4 line priority encoder

Product specification

74HC/HCT147

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard

ICC category: MSI

Note to HCT types

The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.

To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

INPUT

A3, A4, A7, A8

A5, A6, A0, A1, A2

UNIT LOAD COEFFICIENT

1.50

1.10

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

Tamb (°C)

SYMBOL PARAMETER

74HCT

+25

−40 to +85

min. typ. max. min. max.

tPHL/ tPLH

propagation delay

An to Yn

20 35

44

tTHL/ tTLH

output transition

time

7 15

19

−40 to +125

min. max.

53

22

UNIT

ns

ns

TEST CONDITIONS

VCC WAVEFORMS

(V)

4.5 Fig.6

4.5 Fig.6

AC WAVEFORMS

(1) HC : VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.6 Waveforms showing the decimal data inputs (An) to output (Yn) propagation delays and the output

transition times.

PACKAGE OUTLINES

See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.

December 1990

7

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