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74HCU04 Datasheet(PDF) 7 Page - NXP Semiconductors |
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74HCU04 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 7 page September 1993 7 Philips Semiconductors Product specification Hex inverter 74HCU04 OPTIMUM VALUE FOR R2 EXTERNAL COMPONENTS FOR RESONATOR (f < 1 MHz) Note 1. All values given are typical and must be used as an initial set-up. FREQUENCY (MHz) R2 (k Ω) OPTIMUM FOR 3 2 8 minimum required ICC minimum influence due to change in VCC 6 1 4.7 minimum ICC minimum influence by VCC 10 0.5 2 minimum ICC minimum influence by VCC 14 0.5 1 minimum ICC minimum influence by VCC > 14 replace R2 by C3 with a typical value of 35 pF FREQUENCY (kHz) R1 (M Ω) R2 (k Ω) 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 Fig.13 Crystal oscillator configuration. C1 = 47 pF (typ.) C2 = 33 pF (typ.) R1 = 1 to 10 MΩ (typ.) R2 optimum value depends on the frequency and required stability against changes in VCC or average minimum ICC (ICC is typically 5 mA at VCC = 5 V and f = 10 MHz). Note to Application information All values given are typical unless otherwise specified. PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”. Fig.14 HCU04 used as an astable multivibrator RS ≈ 2 × R. The average ICC (mA) is approximately 3.5 + 0.05 × f (MHz) × C (pF) at VCC = 5.0 V (for more information refer to “DESIGNERS GUIDE”). f 1 T --- 1 2.2 RC ------------------ ≈ = Fig.15 Typical input capacitance as a function of input voltage. (1) VCC = 2.0 V. (2) VCC = 3.0 V. (3) VCC = 4.0 V. (4) VCC = 5.0 V. (5) VCC = 6.0 V. |
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