74HC643 查看數據表（PDF） - Philips Electronics

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74HC643

Octal bus transceiver; 3-state; true/inverting

Philips Electronics 

Philips Semiconductors

Octal bus transceiver; 3-state;

true/inverting

Product specification

74HC/HCT643

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

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.

INPUT

An

Bn

OE

DIR

UNIT LOAD COEFFICIENT

1.50

0.40

1.50

0.90

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

Tamb (°C)

TEST CONDITIONS

SYMBOL

PARAMETER

74HCT

+25

−40 to +85

−40 to +125

UNIT

VCC

(V)

WAVEFORMS

min. typ. max. min. max. min. max.

tPHL/ tPLH propagation delay

An to Bn;

inverting

10 20

25

30 ns 4.5 Fig.5

tPHL/ tPLH propagation delay

Bn to An;

non-inverting (true)

13 23

29

35 ns 4.5 Fig.6

tPZH/ tPZL 3-state output enable time

16 30

38

45 ns 4.5 Fig.7

OE, DIR to An;

OE, DIR to Bn

tPHZ/ tPLZ 3-state output disable time

17 30

38

45 ns 4.5 Fig.7

OE, DIR to An;

OE, DIR to Bn

tTHL/ tTLH output transition time

5 12

15

18 ns 4.5 Fig.5 and Fig.6

December 1990

5

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