74HC640 查看數據表（PDF） - NXP Semiconductors.

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74HC640

Octal bus transceiver; 3-state; inverting

NXP Semiconductors. 

Philips Semiconductors

Octal bus transceiver; 3-state; inverting

Product specification

74HC/HCT640

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

1.50

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;

Bn to An

11 22

28

33 ns 4.5 Fig.5

tPZH/ tPZL 3-state output enable time

18 30

38

45 ns 4.5 Fig.6

OE, DIR to An;

OE, DIR to Bn

tPHZ/ tPLZ 3-state output disable time

19 30

38

45 ns 4.5 Fig.6

OE, DIR to An;

OE, DIR to Bn

tTHL/ tTLH output transition time

5 12

15

18 ns 4.5 Fig.5

March 1988

5

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