Input protection circuit for protecting an internal circuit of a

Details Input protection circuit for protecting an internal circuit of a Input protection circuit for protecting an internal circuit of a

1993-03-31

1995-07-04

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

361 91, 361111, 257360, H02H 320

Patent

active

054306027

ABSTRACT:
A circuit is provided for protecting the internal circuit of a semiconductor device from electrostatic discharge (ESD). This circuit includes an input pad for applying an input signal to the internal circuit, a metal line for electrically connecting the input pad and internal circuit. This metal line has at least one RC delay stage caused by inherent parasitic resistances and capacitances. Also, a punch-through element is provided to connect the metal line to a ground voltage terminal disposed between the input pad and a delay stage. Finally, a resistor is used to connect the at least one delay stage to the internal circuit.

REFERENCES:
patent: 4745450 (1988-05-01), Hartranft et al.
patent: 4937700 (1990-06-01), Iwahashi
patent: 5027252 (1991-06-01), Yamamura
Duvvury et al., "Internal Chip ESD Phenomena Beyond the Protection Circuit", IEEE, 1988, vo. 35, No. 12, pp. 2133-2139.

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