Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1978-09-05
1980-09-23
Anagnos, Larry N.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307297, 307364, 323 22R, 340636, H03K 520, H03K 1730, H03K 112
Patent
active
042245397
ABSTRACT:
There is provided a voltage level detecting circuit useful as power-up/power-down voltage indicator for a field effect transistor integrated circuit. A constant voltage reference generator is provided by a depletion type transistor in series with two enhancement type transistors coupled between power supply terminals of the integrated circuit chip. Each of the enhancement type transistors have their gate electrodes connected to their drain electrodes while the depletion type transistor has its gate electrode connected to the more negative or reference terminal of the power supply voltage. A constant voltage output is taken from between the junction of one of the enhancement mode transistors and the depletion type transistor. This constant voltage output can be compared against a voltage obtained from a voltage divider circuit which provides an output that varies in accordance with variations in the power supply. The voltage level detector circuit is particularly useful in microprocessors and microcomputer integrated circuit chips.
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Richman, Characteristics and Operation of MOS Field-Effect Devices, pp. 114-118; McGraw-Hill Book Co., 1967.
Musa Fuad H.
Shaw Pern
Anagnos Larry N.
Barbee Joe E.
Motorola Inc.
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