HCT540 datasheet(2/7 Pages) PHILIPS

2 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state;

inverting

74HC/HCT540

FEATURES

• Inverting outputs

• Output capability: bus driver

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT540 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/HCT540 are octal 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 “540” is identical to the “541” but has inverting outputs.

QUICK REFERENCE DATA

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

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”.

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HCT

tPHL/ tPLH

propagation delay An to Yn

CL = 15 pF; VCC = 5 V

input capacitance

3.5

CPD

power dissipation capacitance per buffer notes 1 and 2

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