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CD74HC243MG4 Scheda tecnica(PDF) 6 Page - Texas Instruments

Il numero della parte CD74HC243MG4
Spiegazioni elettronici  High-Speed CMOS Logic Quad-Bus Transceiver with Three-State Outputs
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD74HC243MG4 Scheda tecnica(HTML) 6 Page - Texas Instruments

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6
Test Circuits and Waveforms
FIGURE 1. HC AND HCT TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
FIGURE 3. HC THREE-STATE PROPAGATION DELAY
WAVEFORM
FIGURE 4. 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 5. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT
tPHL
tPLH
tTHL
tTLH
90%
50%
10%
50%
10%
INVERTING
OUTPUT
INPUT
GND
VCC
tr = 6ns
tf = 6ns
90%
tPHL
tPLH
tTHL
tTLH
2.7V
1.3V
0.3V
1.3V
10%
INVERTING
OUTPUT
INPUT
GND
3V
tr = 6ns
tf = 6ns
90%
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
CD54HC243, CD74HC243, CD54HCT243, CD74HCT243


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