CD74HCT670M 查看數據表（PDF） - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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比赛名单

CD74HCT670M

High-Speed CMOS Logic 4x4 Register File

TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 

CD54HC670, CD74HC670, CD74HCT670

Test Circuits and Waveforms (Continued)

6ns

OUTPUT

DISABLE

50%

OUTPUT LOW

TO OFF

tPLZ

tPHZ

OUTPUT HIGH

TO OFF

OUTPUTS

ENABLED

90%

10%

90%

6ns

10%

tPZL

tPZH

OUTPUTS

DISABLED

VCC

GND

50%

50%

OUTPUTS

ENABLED

FIGURE 7. HC THREE-STATE PROPAGATION DELAY

WAVEFORM

tr

6ns

OUTPUT

DISABLE

OUTPUT LOW

TO OFF

tPLZ

tPHZ

OUTPUT HIGH

TO OFF

OUTPUTS

ENABLED

tf

2.7

1.3

6ns

0.3

tPZL

3V

GND

10%

90%

tPZH

OUTPUTS

DISABLED

1.3V

1.3V

OUTPUTS

ENABLED

FIGURE 8. HCT THREE-STATE PROPAGATION DELAY

WAVEFORM

OTHER

INPUTS

TIED HIGH

OR LOW

OUTPUT

DISABLE

IC WITH

THREE-

STATE

OUTPUT

OUTPUT

RL = 1kΩ

CL

50pF

VCC FOR tPLZ AND tPZL

GND FOR tPHZ AND tPZH

NOTE: Open drain waveforms tPLZ and tPZL are the same as those for three-state shown on the left. The test circuit is Output RL = 1kΩ to

VCC, CL = 50pF.

FIGURE 9. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT

8

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