74HC243NB 查看數據表（PDF） - Philips Electronics

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74HC243NB

Quad bus transceiver; 3-state

Philips Electronics 

Philips Semiconductors

Quad bus transceiver; 3-state

Product specification

74HC/HCT243

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

OEA

OEB

UNIT LOAD COEFFICIENT

1.10

1.10

1.00

1.00

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

13 22

28

33 ns 4.5 Fig.5

tPZH/ tPZL 3-state output enable time

18 34

43

51 ns 4.5 Figs 6 and 7

OEA to An or Bn;

OEB to An or Bn

tPHZ/ tPLZ 3-state output disable time

23 35

44

53 ns 4.5 Figs 6 and 7

OEA to An or Bn;

OEB to An or Bn

tTHL/ tTLH output transition time

5 12

15

18 ns 4.5 Fig.5

December 1990

6

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