Digital circuit for conserving static current in an electronic d

Details Digital circuit for conserving static current in an electronic d Digital circuit for conserving static current in an electronic d

1997-07-01

1999-08-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 18, 327198, H03L 700

Patent

active

059429240

ABSTRACT:
This invention relates to a digital circuit for controlling the power usage of an electronic device such as a read only memory (ROM) for a computer device, particularly a portable computer device that relies on a battery power source. The circuit includes the latch, a positive edge detecting circuit, a negative edge detecting circuit, a guaranteed reset circuit, and a delay circuit. Control signals from the device open and close the latch when either a rising or falling edge of these control signals is detected by the edge detecting circuits. The latch itself includes a three input NAND gate and a two input NAND gate. The guaranteed reset circuit ensures that the circuit is initiated. The delay circuit includes a series of inverters and loads. The edge detecting circuits generate a pulse when a rising or falling edge is detected, and include a pulse generating portion, a NAND gate and inverters.

REFERENCES:
patent: 4039858 (1977-08-01), Stewart
patent: 4843264 (1989-06-01), Galbraith
patent: 5111078 (1992-05-01), Miyamoto et al.
patent: 5374894 (1994-12-01), Fong
patent: 5638016 (1997-06-01), Eitrheim
patent: 5770952 (1998-06-01), Yu
Yukihiro Saeki, et al.; "Low-Power Consumption and Low-Voltage Operation PLA (L2-PLA) Using 1.2um Double Poly-Silicon CMOS E2Prom Technology"; Proceedings of the Midwest Symposium on Circuits and Systems, Champaign; Aug. 14-16, 1989; vol. 2; No. SYMP. 32, Aug. 14, 1989; pp. 1061-1065; IEEE .

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