74HC643 datasheet(2/6 Pages) PHILIPS

2 / 6 page

December 1990

Philips Semiconductors

Product speciﬁcation

Octal bus transceiver; 3-state;

true/inverting

74HC/HCT643

FEATURES

• Octal bidirectional bus interface

• True and inverting 3-state outputs

• Output capability: bus driver

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT643 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/HCT643 are octal transceivers featuring true

and inverting 3-state bus compatible outputs in both send

and receive directions.

The “643” features an output enable (OE) input for easy

cascading and a send/receive (DIR) for direction control.

OE controls the outputs so that the buses are effectively

isolated.

QUICK REFERENCE DATA

GND = 0 V; Tamb =25 °C; tr =tf =6ns

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 Bn; inverting

Bn to An; true

CL = 15 pF; VCC = 5 V

input capacitance

3.5

CI/O

input/output capacitance

CPD

power dissipation capacitance per transceiver notes 1 and 2

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