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HEF4001UBT bảng dữ liệu(PDF) 6 Page - NXP Semiconductors |
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HEF4001UBT bảng dữ liệu(HTML) 6 Page - NXP Semiconductors |
6 / 8 page January 1995 6 Philips Semiconductors Product specification Quadruple 2-input NOR gate HEF4001UB gates APPLICATION INFORMATION Some examples of applications for the HEF4001UB are shown below. Because of the fact that this circuit is unbuffered, it is suitable for use in (partly) analogue circuits. Fig.9 (a) Astable relaxation oscillator using two HEF4001UB gates; the diodes may be BAW62; C2 is a parasitic capacitance. (b) Waveforms at the points marked A, B, C and D in the circuit diagram. INH O HL L OSC In Fig.9 the oscillation frequency is mainly determined by R1C1, provided R1 << R2 and R2C2 << R1C1. The function of R2 is to minimize the influence of the forward voltage across the protection diodes on the frequency; C2 is a stray (parasitic) capacitance. The period Tp is given by Tp =T1 + T2, in which VST is the signal threshold level of the gate. The period is fairly independent of VDD, VST and temperature. The duty factor, however, is influenced by VST. T 1 R1C1 ln V DD V ST + V ST --------------------------- and T 2 R1C1 ln 2V DD V ST – V DD V ST – --------------------------------- where = = |
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