Off chip driver having slew rate control and differential voltag

Details Off chip driver having slew rate control and differential voltag Off chip driver having slew rate control and differential voltag

1995-12-18

1997-10-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327108, 326 80, H03L 500

Patent

active

056821166

ABSTRACT:
An OCD (off chip driver) to be used in either a mixed power supply (i.e. three and five volts) environment, without causing damaging stress to the circuitry, or in a single power supply environment (three volts). The OCD has sequential circuitry to control the slew rate of the current leaving the chip. By providing three output driver circuits, the logic states can control the slew rate (dl/dt) of the current and thus control the switching speed between a logical one and zero. Additionally, with this circuitry, the control logic on the gates of pull up PFETs, the low voltage on the gates will be above a certain level, for example 0.5 volts at the gates that eliminates the PFET's stresses due to the OCD operation in an external 5 volt environment. Furthermore, the logic circuitry is designed to have no direct current penalties; there is no draw of any direct current. Also there are resistors that are operable on the OCD to short out the stress reducing control logic if the chip is intended to operate in only a 3 volt environment.

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