Power-on detection circuit

Details Power-on detection circuit Power-on detection circuit

1987-06-11

1989-07-18

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

3072993, 307591, 3072963, 340663, 361 56, 323315, H03K 5153, H03K 1714, H03K 1716, H03K 1760

Patent

active

048496561

ABSTRACT:
A threshold comparator having hysteresis wherein the repeatable threshold levels are established by multiple current paths and resistance ratios, which provides an under-voltage lock-out signal. The current paths are established by transistors fabricated on a common substrate and include a split collector P-N-P transistor that provides the distribution of the input signal to the various current paths. The turn-on and turn-off threshold points of the circuit according to the present invention are established by resistance ratios which are more easily maintained than are absolute resistance values. Similarly, when implemented on a common substrate, the remaining component values may be selected so that the thresholds values are nearly independent of temperature, providing an easily manufactured, high yield circuit.

REFERENCES:
patent: 4184087 (1980-01-01), Nutz
patent: 4408132 (1983-10-01), Kuwahara
patent: 4525638 (1985-06-01), Gray
patent: 4717839 (1988-01-01), Miller
Lefferts, "A New Interfacing Concept; the Monolithic Temperature Transducer", National Semiconductor, AN-132, p. 7, 1975.

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