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74LVCH244APW Datasheet(PDF) 6 Page - NXP Semiconductors |
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74LVCH244APW Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 10 page  Philips Semiconductors Product specification 74LVC244A 74LVCH244A Octal buffer/line driver with 5-volt tolerant inputs/outputs (3-State) 1998 May 20 6 AC CHARACTERISTICS GND = 0V; tr = tf v 2.5ns; CL = 50pF; RL = 500Ω; Tamb = –40°C to +85°C. LIMITS SYMBOL PARAMETER WAVEFORM VCC = 3.3V ±0.3V VCC = 2.7V VCC = 1.2V UNIT MIN TYP1 MAX MIN MAX TYP tPHL tPLH Propagation delay 1An to 1Yn; 2An to 2Yn 1, 3 1.5 3.5 5.9 1.5 6.9 16.0 ns tPZH tPZL 3-State output enable time 1OE to 1Yn; 2OE to 2Yn 2, 3 1.5 4.3 7.6 1.5 8.6 19.0 ns tPHZ tPLZ 3-State output disable time 1OE to 1Yn; 2OE to 2Yn 2, 3 1.5 3.7 5.8 1.5 6.8 17.0 ns NOTE: 1. Unless otherwise stated, all typical values are at VCC = 3.3V and Tamb = 25°C. AC WAVEFORMS VM = 1.5 V at VCC w 2.7 V; VM = 0.5 VCC at VCC < 2.7 V VOL and VOH are the typical output voltage drop that occur with the output load. VX = VOL + 0.3V at VCC ≥ 2.7V; VX = VOL + 0.1 VCC at VCC < 2.7V VY = VOH – 0.3V at VCC ≥ 2.7V; VY = VOH – 0.1 VCC at VCC < 2.7V SY00041 INPUT VM tPHL tPLH VOL VI VM GND VOH OUTPUT Waveform 1. Input (Dn) to output (Qn) propagation delays. tPLZ tPZL VI nOE INPUT GND VCC Qn OUTPUT LOW-to-OFF OFF-to-LOW VOL VOH Qn OUTPUT HIGH-to-OFF OFF-to-HIGH GND outputs enabled outputs enabled outputs disabled tPHZ VM VM VM tPZH VX VY SW00207 Waveform 2. 3-State enable and disable times. TEST CIRCUIT PULSE GENERATOR RT VIN D.U.T. VOUT CL VCC RL=500 Ω 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 VIN VCC 2.7V RL = Load resistor CL = Load capacitance includes jig and probe capacitance RT = Termination resistance should be equal to ZOUT of pulse generators. SW00047 RL=500 Ω Waveform 3. Load circuitry for switching times. |
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