74HC595 查看數據表（PDF） - Philips Electronics

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74HC595

8-bit serial-in, serial or parallel-out shift register with output latches; 3-state

Philips Electronics 

Philips Semiconductors

8-bit serial-in, serial or parallel-out shift

register with output latches; 3-state

Product specification

74HC595; 74HCT595

handbook, full pagewidth

OE input

10%

tr

90%

VM

tPLZ

Qn output

LOW-to-OFF

OFF-to-LOW

Qn output

HIGH-to-OFF

OFF-to-HIGH

tPHZ

10%

90%

outputs

enabled

tf

tPZL

VM

tPZH

outputs

disabled

VM

outputs

enabled

MSA697

74HC595: VM = 50%; VI = GND to VCC.

74HCT595: VM = 1.3 V; VI = GND to 3 V.

Fig.11 Waveforms showing the 3-state enable and disable times for input OE.

handbook, full pagewidth

VI

PULSE

GENERATOR

VCC

D.U.T

RT

VCC

VO

RL = 1 kΩ

CL 50 pF

MGK563

TEST

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

SWITCH

open

VCC

GND

Definitions for test circuit:

RL = Load resistor.

CL = Load capacitance including jig and probe capacitance.

RT = Termination resistance should be equal to the output impedance Zo of the pulse generator.

Fig.12 Test circuit for 3-state outputs.

2003 Jun 25

21

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