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74AHCU04 Datenblatt(PDF) 8 Page - NXP Semiconductors |
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74AHCU04 Datenblatt(HTML) 8 Page - NXP Semiconductors |
8 / 14 page 74AHCU04_3 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 03 — 14 November 2007 8 of 14 NXP Semiconductors 74AHCU04 Hex inverter Table 8. External components for resonator (f < 1 MHz) All values given are typical and must be used as an initial set-up. Frequency R1 R2 C1 C2 10 kHz to 15.9 kHz 22 M Ω 220 k Ω 56 pF 20 pF 16 kHz to 24.9 kHz 22 M Ω 220 k Ω 56 pF 10 pF 25 kHz to 54.9 kHz 22 M Ω 100 k Ω 56 pF 10 pF 55 kHz to 129.9 kHz 22 M Ω 100 k Ω 47 pF 5 pF 130 kHz to 199.9 kHz 22 M Ω 47 k Ω 47 pF 5 pF 200 kHz to 349.9 kHz 10 M Ω 47 k Ω 47 pF 5 pF 350 kHz to 600 kHz 10 M Ω 47 k Ω 47 pF 5 pF Table 9. Optimum value for R2 Frequency R2 Optimum for 3 kHz 2.0 k Ω minimum required ICC 8.0 k Ω minimum influence due to change in VCC 6 kHz 1.0 k Ω minimum required ICC 4.7 k Ω minimum influence by VCC 10 kHz 0.5 k Ω minimum required ICC 2.0 k Ω minimum influence by VCC 14 kHz 0.5 k Ω minimum required ICC 1.0 k Ω minimum influence by VCC >14 kHz - replace R2 by C3 with a typical value of 35 pF |
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