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CD74FCT245 Datenblatt(PDF) 5 Page - Texas Instruments

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Teilenummer CD74FCT245
Bauteilbeschribung  BiCMOS FCT Interface Logic, Octal-Bus Tranceivers, Three-State
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CD74FCT245 Datenblatt(HTML) 5 Page - Texas Instruments

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5
Test Circuits and Waveforms
NOTE:
9. Pulse Generator for All Pulses: Rate
≤ 1.0MHz; ZOUT ≤ 50Ω;
tf, tr ≤ 2.5ns.
FIGURE 1. TEST CIRCUIT
FIGURE 2. SETUP, HOLD, AND RELEASE TIMING
FIGURE 3. PULSE WIDTH
FIGURE 4. ENABLE AND DISABLE TIMING
FIGURE 5. PROPAGATION DELAY
3V
0
DUT
PULSE ZO
GEN
7V
500
50pF
500
VCC
RT
RT = ZO
V0
CL
RL
RL
VI
tr, tf = 2.5ns
(NOTE 9)
SWITCH POSITION
TEST
SWITCH
tPLZ, tPZL, Open Drain
Closed
tPHZ, tPZH, tPLH, tPHL
Open
DEFINITIONS:
CL = Load capacitance, includes jig and probe
capacitance.
RT = Termination resistance, should be equal to ZOUT of
the Pulse Generator.
VIN = 0V to 3V.
Input: tr =tf = 2.5ns (10% to 90%), unless otherwise specified
ASYNCHRONOUS CONTROL
tH
tSH
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
tH
tSH
PRESET CLEAR
CLOCK ENABLE
ETC.
SYNCHRONOUS CONTROL
tREM
DATA
INPUT
TIMING
INPUT
tW
LOW-HIGH-LOW
PULSE
HIGH-LOW-HIGH
PULSE
1.5V
1.5V
3V
1.5V
0V
CONTROL INPUT
OUTPUT
NORMALLY LOW
OUTPUT
NORMALLY HIGH
SWITCH
OPEN
tPZL
3.5V
1.5V
1.5V
0V
tPLZ
tPHZ
tPZH
0V
3.5V
0.3V
0.3V
VOL
VOH
SWITCH
CLOSED
ENABLE
DISABLE
1.5V
3V
0V
1.5V
3V
0V
tPLH
SAME PHASE
INPUT TRANSITION
tPHL
tPLH
tPHL
OPPOSITE PHASE
INPUT TRANSITION
OUTPUT
1.5V
VOH
VOL
CD54FCT245, CD74FCT245


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