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74AHCU04D Arkusz danych(PDF) 10 Page - NXP Semiconductors |
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74AHCU04D Arkusz danych(HTML) 10 Page - NXP Semiconductors |
10 / 16 page 1999 Sep 27 10 Philips Semiconductors Product specification Hex inverter 74AHCU04 Table 1 External components for resonator (f < 1 MHz) Note 1. All values given are typical and must be used as an initial set-up. Table 2 Optimum value for R2 FREQUENCY (kHz) R1 (M Ω)R2 (kΩ) C1 (pF) C2 (pF) 10 to 15.9 22 220 56 20 16 to 24.9 22 220 56 10 25 to 54.9 22 100 56 10 55 to 129.9 22 100 47 5 130 to 199.9 22 47 47 5 200 to 349.9 10 47 47 5 350 to 600 10 47 47 5 FREQUENCY (kHz) R2 (k Ω) OPTIMUM FOR 3 2.0 minimum required ICC 8.0 minimum influence due to change in VCC 6 1.0 minimum required ICC 4.7 minimum influence by VCC 10 0.5 minimum required ICC 2.0 minimum influence by VCC 14 0.5 minimum required ICC 1.0 minimum influence by VCC >14 replace R2 by C3 with a typical value of 35 pF Fig.14 Used as an astable multivibrator. handbook, halfpage U04 U04 C RS R MNA356 The average ICC (mA) is approximately 3.5 + 0.05 × f (MHz) × C (pF) at VCC = 5.0 V. R S 2R × ≈ 1 1 T --- 1 2.2RC ----------------- ≈ = |
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