74HCT245D 查看數據表（PDF） - Philips Electronics

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74HCT245D

Octal bus transceiver; 3-state

Philips Electronics 

Philips Semiconductors

Octal bus transceiver; 3-state

Product specification

74HC/HCT245

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

0.40

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;

Bn to An

12 22

28

33 ns 4.5 Fig.5

tPZH/ tPZL 3-state output enable time

16 30

38

45 ns 4.5 Fig.6

OE to An;

OE to Bn

signalname DIR

tPHZ/ tPLZ 3-state output disable time

16 30

38

45 ns 4.5 Fig.6

OE to An;

OE to Bn

signalname DIR

tTHL/ tTLH output transition time

5 12

15

18 ns 4.5 Fig.5

September 1993

6

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