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M74HC643 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. M74HC643
Description  OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS INVERTING/NON INVERTING
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M74HC643 Datasheet(HTML) 6 Page - STMicroelectronics

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M74HC643
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TEST CIRCUIT
CL = 50pF/150pF or equivalent (includes jig and probe capacitance)
R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1 : PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
VCC
tPZH, tPHZ
GND


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