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74LVC240A Datasheet(PDF) 6 Page - NXP Semiconductors |
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74LVC240A Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 11 page 
Philips Semiconductors Product specification 74LVC240A Octal buffer/line driver with 5-volt tolerant inputs/outputs; inverting (3-State) 1998 May 20 6 AC WAVEFORMS VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V. VOL and VOH are the typical output voltage drop that occur with the output load. VX = VOL + 0.3V at VCC w 2.7V; VX = VOL + 0.1 VCC at VCC t 2.7V VY = VOH –0.3V at VCC w 2.7V; VY = VOH – 0.1 VCC at VCC t 2.7V INPUTS VM tPHL tPLH VOL VI VM GND VOH OUTPUTS SW00221 Waveform 1. Inputs (1An, 2An) to outputs (1Yn, 2Yn) propagation delays. SV00613 outputs disabled outputs enabled outputs enabled tPHZ tPZH tPZL tPLZ Qn OUTPUT HIGH-to-OFF OFF-to-HIGH Qn OUTPUT LOW-to-OFF OFF-to-LOW VM VM nOE INPUT VX VOL VOH VY GND GND VCC VI VM Waveform 2. 3-State enable and disable times. TEST CIRCUIT PULSE GENERATOR RT VIN D.U.T. VOUT 50pF VCC SWITCH POSITION TEST SWITCH tPLH/tPHL Open tPLZ/tPZL 2 <VCC tPHZ/tPZH GND Test Circuit for 3-State Outputs Open GND S1 2 <VCC DEFINITIONS VCC t 2.7V 2.7 – 3.6V VI VCC 2.7V RT = Termination resistance should be equal to ZOUT of pulse generators. SW00233 500 Ω 500 Ω Waveform 3. Load circuitry for switching times. |
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