74HCT7541 datasheet(6/7 Pages) PHILIPS

Teilenummer	74HCT7541

Bauteilbeschribung	Octal Schmitt trigger buffer/line driver; 3-state

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Hersteller	PHILIPS [NXP Semiconductors]

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December 1990

6

Philips Semiconductors

Product speciﬁcation

Octal Schmitt trigger buffer/line driver; 3-state

74HC/HCT7541

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

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

Transfer characteristics are given below (not applicable for OEn inputs).

Output capability: bus driver

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

TRANSFER CHARACTERISTICS FOR 74HCT

Voltages are referred to GND (ground = 0 V)

INPUT

UNIT LOAD COEFFICIENT

OE1

OE2

An

1.30

0.20

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

19

32

40

48

ns

4.5

Fig.8

tPZH/ tPZL

3-state output enable time

OEn to Yn

18

32

40

48

ns

4.5

Fig.8

tPHZ/ tPLZ

3-state output disable time

OEn to Yn

20

32

40

48

ns

4.5

Fig.8

tTHL/ tTLH

output transition time

5

12

15

18

ns

4.5

Fig.8

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

2.0

2.1

2.0

2.1

2.0

2.1

V

4.5

5.5

Figs 6 and 7

VT−

negative-going threshold

0.70

0.80

0.64

0.74

0.60

0.70

V

4.5

5.5

Figs 6 and 7

VH

hysteresis (VT+ − VT−)

0.17

0.23

V

4.5

5.5

Figs 6 and 7

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