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74HC4060PW 数据表(PDF) 11 Page - NXP Semiconductors |
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74HC4060PW 数据表(HTML) 11 Page - NXP Semiconductors |
11 / 12 page December 1990 11 Philips Semiconductors Product specification 14-stage binary ripple counter with oscillator 74HC/HCT4060 Fig.7 Test set-up for measuring forward transconductance gfs =dio / dvi at vo is constant (see also graph Fig.8); MR = LOW. handbook, halfpage MBA333 14 12 10 8 6 4 2 0123 456 g fs (mA/V) CC V (V) max. min. typ. Fig.8 Typical forward transconductance gfs as a function of the supply voltage VCC at Tamb =25 °C. Fig.9 RC oscillator frequency as a function of Rt and Ct at VCC = 2.0 to 6.0 V; Tamb =25 °C. Ct curve at Rt = 100 kΩ; R2 = 200 kΩ. Rt curve at Ct = 1 nF; R2 = 2 × Rt. RC OSCILLATOR Fig.10 Example of a RC oscillator. Typical formula for oscillator frequency: f osc 1 2.5 R t C t × × -------------------------------- = TIMING COMPONENT LIMITATIONS The oscillator frequency is mainly determined by RtCt, provided R2 ≈ 2Rt and R2C2 << RtCt. The function of R2 is to minimize the influence of the forward voltage across the input protection diodes on the frequency. The stray capacitance C2 should be kept as small as possible. In consideration of accuracy, Ct must be larger than the inherent stray capacitance. Rt must be larger than the “ON” resistance in series with it, which typically is 280 Ω at VCC = 2.0 V, 130 Ω at VCC = 4.5 V and 100 Ω at VCC = 6.0 V. The recommended values for these components to maintain agreement with the typical oscillation formula are: Ct > 50 pF, up to any practical value, 10 k Ω< Rt < 1 MΩ. In order to avoid start-up problems, Rt ≥ 1 kΩ. |
类似零件编号 - 74HC4060PW |
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类似说明 - 74HC4060PW |
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