Electrostatic discharge protection circuitry for any two externa

Details Electrostatic discharge protection circuitry for any two externa Electrostatic discharge protection circuitry for any two externa

1988-06-27

1989-09-26

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361111, 357 2313, H02H 320, H02H 904

Patent

active

048705306

ABSTRACT:
A protective circuit for bipolar integrated circuits to prevent inadvertent damage caused by electrostatic discharge includes a plurality of clamping networks (12a-12n). Each of the plurality of clamping networks (12a-12n). is connected between a corresponding one of a number of external input/output pins (P1-Pn) of the integrated circuit and a common bus line (14) which is connected to an external substrate pin (PS). Each of the plurality of clamping networks (12a-12n) includes a silicon-controlled rectifier (T1), a diode (D1), a first resistor (R1) and a second resistor (R2). When any one of the number of external input/output pins (P1-Pn) receives a voltage higher than a predeter-mined value and any remaining one of the external input/output pins (P1-Pn) contacts a ground potential, a discharge path is formed by a single silicon-controlled rectifier and a single diode so as to protect an internal circuit portion.

REFERENCES:
patent: 3626249 (1971-12-01), Snedeker
patent: 4079211 (1978-03-01), Janssen
patent: 4484244 (1984-11-01), Avery
patent: 4631567 (1986-12-01), Kokado et al.
patent: 4686602 (1987-08-01), Bucksch

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