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74HC244D Datasheet(PDF) 14 Page - NXP Semiconductors |
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74HC244D Datasheet(HTML) 14 Page - NXP Semiconductors |
14 / 22 page 74HC_HCT244_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 03 — 22 December 2005 14 of 22 Philips Semiconductors 74HC244; 74HCT244 Octal buffer/line driver; 3-state Test data is given in Table 12. Definitions test circuit: RT = Termination resistance should be equal to output impedance Zo of the pulse generator CL = Load capacitance including jig and probe capacitance RL = Load resistor S1 = Test selection switch Fig 8. Load circuitry for switching times Table 12: Test data Type Input Load S1 position VI tr, tf CL RL tPHL, tPLH tPZH, tPHZ tPZL, tPLZ 74HC244 VCC 6 ns 15 pF, 50 pF 1 k Ω open GND VCC 74HCT244 3 V 6 ns 15 pF, 50 pF 1 k Ω open GND VCC VM VM tW tW 10 % 90 % 0 V VI VI negative pulse positive pulse 0 V VM VM 90 % 10 % tf tr tr tf 001aad983 DUT VCC VCC VI VO RT RL S1 CL open PULSE GENERATOR |
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