Jose A Cavazos

US Patent:

D504346, Apr 26, 2005

Filed:

Jul 14, 2004

Appl. No.:

29/209280

Inventors:

Jose R. Cavazos - Van Nuys CA, US

International Classification:

1005

US Classification:

D10116

US Patent:

20040124899, Jul 1, 2004

Filed:

Feb 12, 2003

Appl. No.:

10/344488

Inventors:

Jose Cavazos - Houston TX, US
Robert Simie - Seabrook TX, US

International Classification:

H03K003/02

US Classification:

327/199000

Abstract:

A synchronizer eliminates metastability due to violation of either the setup time or the hold time of a circuit. The input of a first flip-flop () is tied to a constant logic level (VDD or ground). The first flip-flop receives an asynchronous signal into the reset (preset or clear) input of the flip-flop. No violation of the setup or hold times of the flip-flop can occur. The second flip-flop () receives the output of the first flip-flop as its clock input. The second flip-flop () is configured as a toggler. The second flip-flop produces a synchronized partial signal () of the original asynchronous signal (). Third and fourth flip-flops () may similarly be configured to produce a second synchronized partial signal () of the asynchronous signal recovery and may prevent runt pulses from being received by the flip-flops.