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74LV14PWDH Arkusz danych(PDF) 7 Page - NXP Semiconductors |
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74LV14PWDH Arkusz danych(HTML) 7 Page - NXP Semiconductors |
7 / 12 page Philips Semiconductors Product specification 74LV14 Hex inverting Schmitt-trigger 1998 Apr 20 7 APPLICATION INFORMATION The slow input rise and fall times cause additional power dissipation, this can be calculated using the following formula: Pad = fi × (tr × ICCa + tf × ICC a ) × VCC. Where: Pad = additional power dissipation ( mW) fi = input frequency (MHz) tr = input rise time (ns); 10% – 90% tf = input fall time (ns); 10% – 90% I CCa = average additional supply current ( mA) Average I CCadiffers with positive or negative input transitions, as shown in Figure 7. SV00431 1.0 0 25 50 75 average ICC ( mA) VCC(V) 100 1.5 2.0 2.5 3.0 negative-going edge positive-going edge Figure 7. Average ICC for LV Schmitt-trigger devices; linear change of VI between 0.1 VCC to 0.9 VCC. SV00433 R C Figure 8. Relaxation oscillator using the LV14. Note to application information: All values given are typical unless otherwise specified. Note to Figure 8 f + 1 T [ 1 0.8 RC |
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