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N74F657N Datasheet(PDF) 8 Page - NXP Semiconductors |
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N74F657N Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 12 page Philips Semiconductors Product specification 74F657 Octal transceiver with 8-bit parity generator/checker 90 July 30 8 TEST CIRCUIT AND WAVEFORMS tw 90% VM 10% 90% VM 10% 90% VM 10% 90% VM 10% NEGATIVE PULSE POSITIVE PULSE tw AMP (V) 0V 0V tTHL (tf ) INPUT PULSE REQUIREMENTS rep. rate tw tTLH tTHL 1MHz 500ns 2.5ns 2.5ns Input Pulse Definition VCC family 74F D.U.T. PULSE GENERATOR RL CL RT VIN VOUT Test Circuit for Open Collector Outputs DEFINITIONS: RL = Load resistor; see AC electrical characteristics for value. CL = Load capacitance includes jig and probe capacitance; see AC electrical characteristics for value. RT = Termination resistance should be equal to ZOUT of pulse generators. tTHL (tf ) tTLH (tr ) tTLH (tr ) AMP (V) amplitude 3.0V 1.5V VM RL 7.0V SF00128 TEST SWITCH tPLZ closed tPZL closed All other open SWITCH POSITION |
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