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74ALS138N Datasheet(PDF) 5 Page - NXP Semiconductors |
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74ALS138N Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 8 page  Philips Semiconductors Product specification 74ALS138 1-of-8 decoder/demultiplexer 1996 Jul 03 5 AC ELECTRICAL CHARACTERISTICS LIMITS SYMBOL PARAMETER TEST CONDITION Tamb = 0°C to +70°C VCC = +5.0V ± 10% CL = 50pF, RL = 500Ω UNIT MIN MAX tPLH tPHL Propagation delay An to Qn Waveform 1, 2 3.0 3.0 22.0 18.0 ns tPLH tPHL Propagation delay E1, E2 to Qn Waveform 2 3.0 3.0 17.0 17.0 ns tPLH tPHL Propagation delay E2 to Qn Waveform 1 3.0 3.0 17.0 17.0 ns AC WAVEFORMS For all waveforms, VM = 1.3V. VM VM VM VM Qn An, E2 tPHL tPLH SF00179 Waveform 1. Propagation Delay for Inverting Outputs VM VM VM VM Qn An, E0, E1 tPHL tPLH SF00180 Waveform 2. Propagation Delay for Non-inverting Outputs 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 Totem-pole 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 SC00005 |
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