Angela Wang

US Patent:

6731139, May 4, 2004

Filed:

Jun 12, 2002

Appl. No.:

10/171393

Inventors:

Joseph D. Wert - Arlington TX
Angela H. Wang - San Jose CA

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

H03K 906

US Classification:

327 49, 327 47, 327 48, 327156, 327163, 327 67

Abstract:

A latch for detecting a state transition of an input signal and generating a self-clearing reset signal on an output. The latch comprises: 1) a transfer gate for passing the input signal to a first node when the input transfer gate is enabled; 2) a transition detector for detecting a transition of the first node from a first to a second state, wherein the transition detector, in response to the transition, disables the transfer gate and enables the reset signal; and 3) a feedback loop circuit for detecting enabling of the reset signal. The feedback loop circuit, in response to the enabling, changes the first node from the second state back to the first state. The transition detector, in response to the changing of the first node back to the first state, disables the reset signal.

US Patent:

6960940, Nov 1, 2005

Filed:

May 3, 2004

Appl. No.:

10/837812

Inventors:

Joseph D. Wert - Arlington TX, US
Angela H. Wang - San Jose CA, US

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

H03K009/06

US Classification:

327 47, 327 49, 327156, 327163

Abstract:

A latch for detecting a state transition of an input signal and generating a self-clearing reset signal on an output. The latch comprises: 1) a transfer gate for passing the input signal to a first node when the input transfer gate is enabled; 2) a transition detector for detecting a transition of the first node from a first to a second state, wherein the transition detector, in response to the transition, disables the transfer gate and enables the reset signal; and 3) a feedback loop circuit for detecting enabling of the reset signal. The feedback loop circuit, in response to the enabling, changes the first node from the second state back to the first state. The transition detector, in response to the changing of the first node back to the first state, disables the reset signal.