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74LV4060D Arkusz danych(PDF) 11 Page - NXP Semiconductors |
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74LV4060D Arkusz danych(HTML) 11 Page - NXP Semiconductors |
11 / 18 page Philips Semiconductors Product specification 74LV4060 14-stage binary ripple counter with oscillator 1998 Jun 23 11 SV00732 Ct C2 R2 RS 11 Rt RTC CTC 10 9 MR (from logic) Figure 3. Example of an RC oscillator. Typical formula for oscillator frequency: f OSC + 1 2.5xRt xCt SV00328 10–2 Ct (mF) 10–1 Rt (W) 103 10 102 103 105 104 fosc (Hz) 10–4 104 10–3 105 106 Figure 4. RC oscillator frequency as a function of Rt and Ct at VCC = 1.2 to 3.6 V; Tamb = 25°C. Ct curve at Rt = 100 kW; R2 = 200 kW. Rt curve at Ct = 1 nF; R2 = 2 x Rt. TIMING COMPONENTS LIMITATIONS The oscillator frequency is mainly determined by Rt . Ct, provided R2 2Rt and R2 . C2 % Rt . Ct. 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 W at VCC = 1.2 V, 130 W at VCC = 2.0 V and 100 W at VCC 3.0 V. The recommended values for these components to maintain agreement with the typical oscillation formula are: Ct > 50pF, up to any practical value, 10 kW < Rt < 1 MW. In order to avoid start-up problems, Rt > 1 kW. |
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