74HC161 datasheet(9/12 Pages) PHILIPS

9 / 12 page

December 1990

Philips Semiconductors

Product speciﬁcation

Presettable synchronous 4-bit binary

counter; asynchronous reset

74HC/HCT161

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

INPUT

UNIT LOAD COEFFICIENT

0.95

1.10

CEP

0.25

CET

0.75

0.30

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

CP to Qn

4.5

Fig.8

tPHL/ tPLH

propagation delay

CP to TC

4.5

Fig.8

tPHL

propagation delay

MR to Qn

4.5

Fig.9

tPHL

propagation delay

MR to TC

4.5

Fig.9

tPHL/ tPLH

propagation delay

CET to TC

4.5

Fig.10

tTHL/ tTLH

output transition time

4.5

Figs 8 and 10

clock pulse width

HIGH or LOW

4.5

Fig.8

master reset pulse

width; LOW

4.5

Fig.9

trem

removal time

MR to CP

4.5

Fig.9

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