Wide power voltage and low power consumption timer circuit

Abstract

The invention discloses a wide power voltage and low power consumption timer circuit which comprises a reference voltage generating circuit (100), a comparer (200), a latch input stage (500), a latch (400), a digital output buffering stage and discharging circuit (700), a bias current generating circuit (300) and a clear circuit (600). The circuit adopts voltage-resistant transistors to realize voltage resistance under a high power voltage. The reference voltage generating circuit adopts depletion-type CMOS (Complementary Metal Oxide Semiconductor) transistors to realize low-voltage working; the latch input stage adopts an amplitude limiting circuit to realize the grid voltage resistance, reduce an effect of the high voltage on a circuit working condition, and ensure normal working of the latch under the high power voltage by adding a switching tube; and the bias current generating circuit with a starting circuit ensures that system power consumption under all the power voltages remains constant.

Description

technical field [0001] The invention relates to a CMOS integrated circuit, in particular to a low-power timer circuit based on a standard CMOS process, which can work under a wide power supply voltage of 2V-20V, and is suitable for various application occasions that require a large working voltage range. Background technique [0002] Timer circuits are widely used in instrumentation, household appliances, electronic measurement and automatic control, etc. As a timing solution with low cost, high reliability, simple peripheral circuits and wide application range, the classic 555 timer circuit can realize multi-harmonic Pulse generation and conversion circuits such as oscillators, monostable triggers and Schmitt triggers. The 555 timer circuit as figure 1 shown. [0003] The 555 timer circuit includes two voltage comparators, three equivalent series resistors, an RS flip-flop, a discharge tube T and a power output stage, providing two reference voltages V CC / 3 and 2V CC / ...

AI Technical Summary

Problems solved by technology

[0005] With the expansion of the application range of the timer circuit, the power supply voltage range that the timer needs to adapt to is also larger. The existing timer scheme cannot meet this requirement. Therefore, a new design scheme must be proposed from the aspects of device selection and circuit design. Ensure that the timer circuit can adapt to the changing requirements of wide power supply voltage

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