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74HC14PW Scheda tecnica(PDF) 10 Page - NXP Semiconductors |
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74HC14PW Scheda tecnica(HTML) 10 Page - NXP Semiconductors |
10 / 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 10 of 21 NXP Semiconductors 74HC14; 74HCT14 Hex inverting Schmitt trigger 15. Application information The slow input rise and fall times cause additional power dissipation, this can be calculated using the following formula: Padd =fi (tr ICC(AV) +tf ICC(AV)) VCC where: Padd = additional power dissipation (W); fi = input frequency (MHz); tr =rise time (ns); 10 %to90%; tf = fall time (ns); 90 % to 10 %; I CC(AV) = average additional supply current (A). Average I CC(AV) differs with positive or negative input transitions, as shown in Figure 12 and Figure 13. An example of a relaxation circuit using the 74HC14; 74HCT14 is shown in Figure 14. a. VCC =4.5 V b. VCC =5.5 V Fig 11. Typical 74HCT transfer characteristics 05 1.5 0 0.3 0.6 0.9 1.2 12 3 4 mna849 ICC (mA) VI (V) 01 2 3 6 1.8 0 0.6 0.3 1.2 1.5 0.9 45 mna850 ICC (mA) VI (V) |
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