Output circuit in which induced switching noise is reduced by pr

Details Output circuit in which induced switching noise is reduced by pr Output circuit in which induced switching noise is reduced by pr

1986-11-21

1988-02-09

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307475, 307481, 307242, 307262, 365233, H03K 1716, H03K 1720

Patent

active

047243406

ABSTRACT:
An integrated circuit has a plurality of outputs which switch to a valid condition at the same time. Because integrated circuits have leads for power supply terminals, there is inductance on these leads. When an output switches logic states, there is a change in current flow so that there is a voltage drop across the inductive lead which is used for power supply coupling. This voltage drop, expressed Ldi/dt, is proportional to the number of outputs which are switched. The worst case for the positive power supply terminal Ldi/dt is when all of the outputs switch from a logic low to a logic high. This worst case is reduced in half by predisposing half of the outputs to one logic state and the other half to the other logic state. This also reduces the worst case for the negative power supply terminal, frequently ground, in half which is the case when all of the outputs switch from a logic high to a logic low.

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