Adjustable output driver circuit having parallel pull-up and pull-down elements

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United States Patent

5838177

Link to this page

http://www.wikipatents.com/5838177.html

Inventor(s)

Keeth; Brent (Boise, ID)

Abstract

An output driver circuit offers control and logic level adjustment for high speed data communications in a synchronous memory such as a synchronous dynamic random access memory (SDRAM). Level adjustment is obtained by resistive division between a termination resistor and controllable impedances between an output node and VDD and VSS power supplies. Control functions include slew rate modification of the signal at the output node, by sequentially turning on or off output transistors in response to a transition in an input signal. Different schemes of weighting the output transistors obtains different characteristics of the output signal. Load matching circuitry and voltage level forcing circuitry is described for improving high frequency operation.

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5694065 Hamasaki 327/108 Dec,1997	Your vote accepted [0 after 0 votes]		5668763 Fujioka 365/200 Sep,1997	Your vote accepted [0 after 0 votes]
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5276642 Lee 365/189.04 Jan,1994	Your vote accepted [0 after 0 votes]		5274276 Casper 326/21 Dec,1993	Your vote accepted [0 after 0 votes]
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5165046 Hesson 327/111 Nov,1992	Your vote accepted [0 after 0 votes]		5150186 Pinney 326/87 Sep,1992	Your vote accepted [0 after 0 votes]
5134311 Biber 327/108 Jul,1992	Your vote accepted [0 after 0 votes]		5128560 Chern 326/81 Jul,1992	Your vote accepted [0 after 0 votes]
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4984204 Sato 365/189.11 Jan,1991	Your vote accepted [0 after 0 votes]		4958088 Farah-Bakhsh 326/24 Sep,1990	Your vote accepted [0 after 0 votes]
4888498 Kadakia 327/546 Dec,1989	Your vote accepted [0 after 0 votes]		4829199 Prater 326/27 May,1989	Your vote accepted [0 after 0 votes]
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4404474 Dingwall 327/170 Sep,1983	Your vote accepted [0 after 0 votes]		4096402 Schroeder 327/77 Jun,1978	Your vote accepted [0 after 0 votes]
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