74HC91 datasheet(5/7 Pages) PHILIPS

5 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

Nine wide Schmitt trigger buffer;

open drain outputs

74HC/HCT9115

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see

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

Transfer characteristics are given below.

Output capability: standard

ICC category: MSI

TRANSFER CHARACTERISTICS FOR 74HC

Voltages are referred to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HC

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

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HC

VCC

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min.

typ.

max. min.

max.

min.

max.

VT+

positive-going threshold

0.70

1.75

2.30

1.13

2.37

3.11

1.50

3.15

4.20

0.70

1.75

2.30

1.50

3.15

4.20

0.70

1.75

2.30

1.50

3.15

4.20

2.0

4.5

6.0

Fig.6

VT−

negative-going threshold

0.30

1.35

1.80

0.70

1.80

2.43

1.10

2.40

3.30

0.30

1.35

1.80

1.10

2.40

3.30

0.30

1.35

1.80

1.10

2.40

3.30

2.0

4.5

6.0

Fig.6

hysteresis (VT+ − VT−)

0.2

0.4

0.5

0.43

0.57

0.68

0.80

1.00

1.10

0.18

0.40

0.50

0.80

1.00

1.10

0.15

0.40

0.50

0.80

1.00

1.10

2.0

4.5

6.0

Fig.6

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HC

VCC

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min. typ.

max. min.

max.

tPHL/ tPLZ

propagation delay

An to Yn

115

140

165

2.0

4.5

6.0

Fig.7

tTHL

output transition time

110

2.0

4.5

6.0

Fig.7

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