74HCT7540 데이터 시트보기 (PDF) - Philips Electronics

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74HCT7540

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

Philips Electronics 

Philips Semiconductors

Octal Schmitt trigger buffer/line driver;

3-state; inverting

Product specification

74HC/HCT7540

FEATURES

• Inverting outputs

• Schmitt trigger action on all data inputs

• Output capability: bus driver

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT7540 are high-speed Si-gate CMOS

devices and are pin compatible with low power Schottky

TTL (LSTTL). They are specified in compliance with

JEDEC standard no. 7A.

The 74HC/HCT7540 are octal Schmitt trigger inverting

buffer/line drivers with 3-state outputs. The 3-state outputs

are controlled by the output enable inputs OE1 and OE2.

A HIGH on OEn causes the outputs to assume a high

impedance OFF-state.

The Schmitt trigger action in the data inputs transforms

slowly changing input signals into sharply defined

jitter-free output signals.

The “7540” is identical to the “540” but has hysteresis on

the data inputs.

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns

SYMBOL PARAMETER

CONDITIONS

tPHL/ tPLH

CI

CPD

propagation delay An to Yn

input capacitance

power dissipation capacitance per buffer

CL = 15 pF; VCC = 5 V

notes 1 and 2

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW):

PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

∑ (CL × VCC2 × fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V

ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.

TYPICAL

HC

HCT

11

16

3.5

3.5

29

31

UNIT

ns

pF

pF

December 1990

2

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