74HC91 datasheet(6/7 Pages) PHILIPS

6 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

Nine wide Schmitt trigger buffer;

open drain outputs

74HC/HCT9115

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Transfer characteristics are given below.

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.

TRANSFER CHARACTERISTICS FOR 74HCT

Voltages are referred to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HCT

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

INPUT

UNIT LOAD COEFFICIENT

0.3

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.

VT+

positive-going threshold

0.9

1.2

1.50

1.70

2.0

2.1

0.9

1.2

2.0

2.1

0.9

1.2

2.0

2.1

4.5

5.5

Fig.6

VT−

negative-going threshold

0.7

0.8

1.06

1.27

1.4

1.7

0.7

0.8

1.4

1.7

0.7

0.8

1.4

2.7

4.5

5.5

Fig.6

hysteresis (VT+ − VT−)

0.2

0.44

0.8

0.2

0.8

0.2

0.8

4.5

5.5

Fig.6

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/ tPLZ

propagation delay

An to Yn

4.5

Fig.7

tTHL

output transition time

4.5

Fig.7

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