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74ALS258DB 데이터시트(PDF) 7 Page - NXP Semiconductors |
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74ALS258DB 데이터시트(HTML) 7 Page - NXP Semiconductors |
7 / 11 page Philips Semiconductors Product specification 74ALS257/74ALS258 Data selector/multiplexer 1991 Feb 08 7 TEST CIRCUIT AND WAVEFORMS tw 90% VM 10% 90% VM 10% 90% VM 10% 90% VM 10% NEGATIVE PULSE POSITIVE PULSE tw AMP (V) 0.3V 0.3V tTHL (tff) INPUT PULSE REQUIREMENTS Rep.Rate tw tTLH tTHL 1MHz 500ns 2.0ns 2.0ns Input Pulse Definition VCC Family 74ALS D.U.T. PULSE GENERATOR RL CL RT VIN VOUT Test Circuit for 3-State 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 3.5V 1.3V VM SC00072 RL 7.0V SWITCH POSITION TEST SWITCH tPLZ, tPZL closed All other open |
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