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74F640 Datasheet(PDF) 7 Page - NXP Semiconductors |
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74F640 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 11 page Philips Semiconductors Product specification 74F640 Octal bus transceiver, inverting (3-State) 1989 Nov 27 7 AC WAVEFORMS For all waveforms, VM = 1.5V. An, Bn Bn, An tPHL VM VM VM VM tPLH SF00773 Waveform 1. Propagation Delay for Inverting Outputs VOL+0.3V VM VM VM An, Bn tPZL tPLZ SF00204 OE Waveform 2. 3-State Output Enable Time to Low Level and Output Disable Time from Low Level VOH–0.3V VM VM VM An, Bn tPZH tPHZ SF00203 OE 0V Waveform 3. 3-State Output Enable Time to High Level and Output Disable Time from High Level 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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