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CD74HC299 Datasheet(数据表) 9 Page - Texas Instruments

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部件型号  CD74HC299
说明  High Speed CMOS Logic 8-Bit Universal Shift Register; Three-State
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
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CD74HC299 Datasheet(HTML) 9 Page - Texas Instruments

 
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9
FIGURE 7. HC THREE-STATE PROPAGATION DELAY
WAVEFORM
FIGURE 8. HCT THREE-STATE PROPAGATION DELAY
WAVEFORM
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
Test Circuits and Waveforms (Continued)
50%
10%
90%
GND
VCC
10%
90%
50%
50%
OUTPUT
DISABLE
OUTPUT LOW
TO OFF
OUTPUT HIGH
TO OFF
OUTPUTS
ENABLED
OUTPUTS
DISABLED
OUTPUTS
ENABLED
6ns
6ns
tPZH
tPHZ
tPZL
tPLZ
0.3
2.7
GND
3V
10%
90%
1.3V
1.3V
OUTPUT
DISABLE
OUTPUT LOW
TO OFF
OUTPUT HIGH
TO OFF
OUTPUTS
ENABLED
OUTPUTS
DISABLED
OUTPUTS
ENABLED
tr
6ns
tPZH
tPHZ
tPZL
tPLZ
6ns
tf
1.3
IC WITH
THREE-
STATE
OUTPUT
OTHER
INPUTS
TIED HIGH
OR LOW
OUTPUT
DISABLE
VCC FOR tPLZ AND tPZL
GND FOR tPHZ AND tPZH
OUTPUT
RL = 1kΩ
CL
50pF
CD74HC299, CD74HCT299




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