December 1990

6

Philips Semiconductors

Product specification

Nine wide Schmitt trigger buffer;

open drain outputs

74HC/HCT9115

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

Transfer characteristics are given below.

Output capability: standard

Note to HCT types

The value of additional quiescent supply current (

To determine

TRANSFER CHARACTERISTICS FOR 74HCT

Voltages are referred to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HCT

INPUT

UNIT LOAD COEFFICIENT

0.3

SYMBOL

PARAMETER

UNIT

TEST CONDITIONS

74HCT

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min.

typ.

max. min.

max.

min.

max.

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

V

4.5

5.5

Fig.6

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

V

4.5

5.5

Fig.6

0.2

0.2

0.44

0.44

0.8

0.8

0.2

0.2

0.8

0.8

0.2

0.2

0.8

0.8

V

4.5

5.5

Fig.6

SYMBOL

PARAMETER

UNIT

TEST CONDITIONS

74HCT

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min. typ. max.

min.

max.

min.

max.

propagation delay

18

31

39

47

ns

4.5

Fig.7

output transition time

7

15

19

22

ns

4.5

Fig.7