Multi-input transition detector with a single delay

Details Multi-input transition detector with a single delay Multi-input transition detector with a single delay

1995-04-24

1996-07-02

Westin, Edward P.

Electronic digital logic circuitry

Clocking or synchronizing of logic stages or gates

Field-effect transistor

326 98, 326121, 327172, 327176, 327354, H03K 19096

Patent

active

055326226

ABSTRACT:
A transition detector circuit produces an output pulse upon detection of a transition at any one of several input nodes using a single delay path so all input transitions produce the same output pulse width and with only one gate delay in the circuit. The circuit includes precharging means, coupled between the plurality of transitioning inputs and the output node, for charging the output node high. The precharging means comprises stacked field effect transistor (FET) devices, each having a gate connected to a respective one of the transitioning inputs. A first charging device for charging the output node high is coupled to the output node. A second charging device for discharging the output node low is coupled to the output node. A single delay means, coupled between the plurality of transitioning inputs and both the first and second charging devices, both turns off the first charging device and turns on the second charging device. Switching means, controlled by the plurality of transitioning inputs and coupled between the output node and the second charging device, disconnects the second charging device from the output node.

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