Power-on detection and enabling circuit with very fast detection

Details Power-on detection and enabling circuit with very fast detection Power-on detection and enabling circuit with very fast detection

1997-09-30

1999-08-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, H03L 700

Patent

active

059429259

ABSTRACT:
Power-on detection circuitry with almost instantaneous response to a power-off condition includes a network of several transistors (30, 32, 38, 40) and a resistor (34). When a supply voltage (+VCC) used with the circuitry is first turned on, the network produces at an output (terminal 52) a short pulse which is subsequently used to generate a power-on (PWRON) signal (line 24) to reset or initialize circuit elements termed "latches" (14). The latches (14) in turn provide operating information to other (main) circuits (16). A reverse coupled diode-connected transistor (30) is provided to shunt to ground charge stored in parasitic capacitance (36) at an input (terminal 50) when power is interrupted, such as by a sudden negative voltage transient. This shunting action of the diode-connected transistor (30) virtually instantly brings the voltage at the input down almost to zero so that whenever power comes back on another short pulse at the output is sure to be generated. This short pulse at the output in turn generates a new PWRON signal for re-setting the latches (14) even though power has been interrupted for only a few nanoseconds.

REFERENCES:
patent: 4591745 (1986-05-01), Shen
patent: 4607178 (1986-08-01), Sugie et al.
patent: 4886984 (1989-12-01), Nakaoka
patent: 4983857 (1991-01-01), Steele
patent: 5467039 (1995-11-01), Bae
patent: 5721502 (1998-02-01), Thomson et al.
patent: 5767710 (1998-06-01), Cho

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