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74ALS244ADB Scheda tecnica(PDF) 5 Page - NXP Semiconductors |
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74ALS244ADB Scheda tecnica(HTML) 5 Page - NXP Semiconductors |
5 / 9 page Philips Semiconductors Product specification 74ALS244A/74ALS244A-1 Octal buffer (3-State) 1991 Feb 08 5 AC WAVEFORMS For all waveforms, VM = 1.3V. VM VM VM VM Yn Ian, Ibn tPLH tPHL SF00231 Waveform 1. Propagation Delay for Non-inverting Outputs VOH–0.3V VM VM VM Yn tPZH tPHZ SF00233 OEn 0V Waveform 2. 3-State Output Enable Time to High Level and Output Disable Time from High Level VOL+0.3V VM VM VM Yn tPZL tPLZ SF00234 OEn 3.5V Waveform 3. 3-State Output Enable Time to Low Level and Output Disable Time from Low 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) 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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