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74HC14N 데이터시트(PDF) 7 Page - NXP Semiconductors |
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74HC14N 데이터시트(HTML) 7 Page - NXP Semiconductors |
7 / 21 page 74HC_HCT14 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 6 — 19 September 2012 7 of 21 NXP Semiconductors 74HC14; 74HCT14 Hex inverting Schmitt trigger 12. Waveforms Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 6. Input to output propagation delays mna722 tPLH tPHL VM VM 90 % 10 % VM VM nY output nA input VI GND VOH VOL tTLH tTHL Table 8. Measurement points Type Input Output VM VM VX VY 74HC14 0.5VCC 0.5VCC 0.1VCC 0.9VCC 74HCT14 1.3 V 1.3 V 0.1VCC 0.9VCC Test data is given in Table 9. 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. Fig 7. Load circuitry for measuring switching times 001aah768 tW tW tr tr tf VM VI negative pulse GND VI positive pulse GND 10 % 90 % 90 % 10 % VM VM VM tf VCC DUT RT VI VO CL G |
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