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74HC Scheda tecnica(PDF) 11 Page - NXP Semiconductors |
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74HC Scheda tecnica(HTML) 11 Page - NXP Semiconductors |
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11 / 19 page ![]() March 1988 11 Philips Semiconductors HCMOS family characteristics FAMILY SPECIFICATIONS Test circuit for 74HC AC waveforms 74HC (continued) CL = load capacitance including jig and probe capacitance (see AC CHARACTERISTICS for values). RT = termination resistance should be equal to the output impedance Zo of the pulse generator. Fig.5 Test circuit. handbook, halfpage MGK565 PULSE GENERATOR D.U.T VCC VI VO RT CL 50 pF Fig.6 Propagation delays of 3-state outputs. handbook, full pagewidth MGK562 tPLZ tPHZ outputs disabled outputs enabled 90% 10% 10% 90% 50% outputs enabled OUTPUT LOW-to-OFF OFF-to-LOW OUTPUT HIGH-to-OFF OFF-to-HIGH OUTPUT ENABLE VCC GND tPZL tf tr tPZH 50% 50% |
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