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74HCT1284D Datasheet(PDF) 6 Page - NXP Semiconductors |
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74HCT1284D Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 12 page Philips Semiconductors Product specification 74HCT1284 Parallel printer interface transceiver/buffer 1998 Jul 10 6 TEST CIRCUITS AND WAVEFORM D.U.T VCC IO VOH/2 VOH is the voltage when 10µA is drawn from the high output. IO is measured by forcing VOH/2 on the output. RD can then be calculated using the equation RD = |VOH/2IO| . SK00007 Figure 1. Output Impedance RD PULSE GENERATOR RT VIN D.U.T VOUT 50pF VCC Test Circuit for Bn or Yn Outputs SWITCH POSITION Bn or Yn Outputs TEST SWITCH tPLH GND tPHL VCC tPZH GND tPHZ GND tPZL VCC tPLZ VCC 35 W S1 GND VCC 62 W PULSE GENERATOR RT VIN D.U.T VOUT CL RL VCC Test Circuit for An Outputs VM VM tW AMP (V) NEGATIVE PULSE 10% 10% 90% 90% 0V VM VM tW AMP (V) POSITIVE PULSE 90% 90% 10% 10% 0V tTHL (tf) tTLH (tr)tTHL (tf) tTLH (tr) VM = 1.5V Input Pulse Definition DEFINITIONS RL = Load resistor; see AC CHARACTERISTICS for value. CL = Load capacitance includes jig and probe capacitance; see AC CHARACTERISTICS for value. RT = Termination resistance should be equal to ZOUT of pulse generators. INPUT PULSE REQUIREMENTS FAMILY Amplitude Rep. Rate tW tr tf 74HCT 3.0V 1MHz 500ns 3ns 3ns SK00008 |
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