74HC240 데이터 시트보기 (PDF) - Philips Electronics

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74HC240

Octal buffer/line driver; 3-state; inverting

Philips Electronics 

Philips Semiconductors

Octal buffer/line driver; 3-state;

inverting

Product specification

74HC/HCT240

FEATURES

GENERAL DESCRIPTION

• Output capability: bus driver

• ICC category: MSI

The 74HC/HCT240 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/HCT240 are octal inverting buffer/line drivers

with 3-state outputs. The 3-state outputs are controlled by

the output enable inputs 1OE and 2OE. A HIGH on nOE

causes the outputs to assume a high impedance

OFF-state. The “240” is identical to the “244” but has

inverting outputs.

QUICK REFERENCE DATA

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

SYMBOL PARAMETER

tPHL/ tPLH

CI

CPD

propagation delay

1An to 1Yn;

2An to 2Yn

input capacitance

power dissipation capacitance per buffer

CONDITIONS

CL = 15 pF; VCC = 5 V

notes 1 and 2

TYPICAL

HC

9

HCT

9

UNIT

ns

3.5

3.5

pF

30

30

pF

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”.

December 1990

2

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