74HC147 datasheet(7/7 Pages) PHILIPS

7 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

10-to-4 line priority encoder

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.

AC CHARACTERISTICS FOR 74HCT

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

AC WAVEFORMS

PACKAGE OUTLINES

See

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

INPUT

UNIT LOAD COEFFICIENT

A3, A4, A7, A8

1.50

A5, A6, A0, A1, A2

1.10

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT

VCC

(V)

WAVEFORMS

+25

−40 to +85

−40 to +125

min.

typ.

max.

min.

max.

min.

max.

tPHL/ tPLH

propagation delay

An to Yn

4.5

Fig.6

tTHL/ tTLH

output transition

time

4.5

Fig.6

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

transition times.

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

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

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