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74HCT14 Arkusz danych(PDF) 8 Page - NXP Semiconductors |
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74HCT14 Arkusz danych(HTML) 8 Page - NXP Semiconductors |
8 / 8 page September 1993 8 Philips Semiconductors Product specification Hex inverting Schmitt trigger 74HC/HCT14 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 × ICCa) × VCC. Where: Average ICCa differs with positive or negative input transitions, as shown in Figs 14 and 15. Pad = additional power dissipation ( µW) fi = input frequency (MHz) tr = input rise time ( µs); 10% − 90% tf = input fall time ( µs); 10% − 90% ICCa = average additional supply current ( µA) Fig.14 Average ICC for HC Schmitt trigger devices; linear change of Vi between 0.1 VCC to 0.9 VCC Fig.15 Average ICC for HCT Schmitt trigger devices; linear change of Vi between 0.1 VCC to 0.9 VCC. HC/HCT14 used in a relaxation oscillator circuit, see Fig.16. Fig.16 Relaxation oscillator using HC/HCT14. HC : f 1 T --- 1 0.8 RC ------------------- ≈ = HCT : f 1 T --- 1 0.67 RC ---------------------- ≈ = Note to Application information All values given are typical unless otherwise specified. PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”. |
Podobny numer części - 74HCT14 |
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Podobny opis - 74HCT14 |
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