Electronic digital logic circuitry – Interface – Supply voltage level shifting
Patent
1995-12-14
1997-11-25
Hudspeth, David R.
Electronic digital logic circuitry
Interface
Supply voltage level shifting
326 34, 326 81, H03K 1716
Patent
active
056916540
ABSTRACT:
A method of limiting or translating the voltages of input signals, and of generating output signals such that the input's high state and low state differ by a different voltage than the output's high and low state. The present invention also teaches a system comprising a level translator circuit having level translators controlled by an operational amplifier or by a Zener diode that regulates the voltage level on one side of the translators, the other side of the translators being regulated by an external power supply. The operational amplifier or Zener diode, in some embodiments of the present invention, ensures that the second side of the level translators are limited to a given reference voltage. Often, a resistor is connected to the Zener diode or to the output of the operational amplifier, and in some embodiments a resistor-capacitor network removes higher-frequency components from the voltage supply. The invention includes a system level embodiment, in which the voltage level translators protect a memory and bus from voltage levels that would otherwise cause damage.
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Arcoleo Mathew R.
Green Gary W.
Sevalia Piyush
Cypress Semiconductor Corp.
Hudspeth David R.
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