Delay circuit for semiconductor integrated circuit devices

Details Delay circuit for semiconductor integrated circuit devices Delay circuit for semiconductor integrated circuit devices

1989-11-16

1990-07-24

James, Andrew J.

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307605, 307608, 307591, 307597, 328 55, 328 66, H03K 5159

Patent

active

049437453

ABSTRACT:
A delay circuit for an IC device is disclosed, which comprises a charging/discharging circuit, a voltage divider and a comparator. The charging/discharging circuit selectively effects a charging/discharging operation in response to an input sigal to thereby generate a variable output voltage. The voltage divider divides a source voltage of the IC device to provide a reference voltage having a predetermined constant potential. The comparator is coupled to the charging/discharging circuit and voltage divider at its inverting input and non-inverting input, respectively, and compares the output voltage of the charging/discharging circuit with the reference voltage. A switch circuit is provided which performs a switching operation in response to the input signal to thereby electrically disconnect the non-inverting input of the comparator from the voltage divider. A capacitor is provided which retains the reference voltage at the non-inverting input of the comparator while the comparator is electrically disconnected from the voltage divider.

REFERENCES:
patent: 3541352 (1970-11-01), Merrill et al.
patent: 3569842 (1971-03-01), Schroyer
patent: 3675047 (1972-07-01), Vahlstrom et al.
patent: 4137503 (1979-01-01), Ziesmer
patent: 4584494 (1986-04-01), Arakawa et al.
patent: 4651270 (1987-03-01), Edwards
patent: 4710654 (1987-12-01), Saitoh et al.
Sakamoto, H.: Timing Generator: in: Motorola, Technical Developments, vol. 6, Oct. 1986; pp. 26 to 27.

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