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N74F244N Datasheet(PDF) 7 Page - NXP Semiconductors |
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N74F244N Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 12 page Philips Semiconductors Product specification 74F244/74F244B Octal buffers (3-State) 1994 Dec 5 7 AC WAVEFORMS For all waveforms, VM = 1.5V. VM VM VM VM Yn Ian, Ibn tPLH tPHL SF00231 Waveform 1. Propagation Delay for data to 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 VM VM Yn, Yn tsk(0) SF00232 Yn, Yn Waveform 3. Output skew VOL+0.3V VM VM VM Yn tPZL tPLZ SF00234 OEn 3.5V Waveform 4. 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) 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 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 3.0V 1.5V VM RL 7.0V SWITCH POSITION TEST SWITCH closed open All other tPLZ, tPZL SF000235 |
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