Logic level voltage translator

a translator and logic technology, applied in the direction of pulse delivery arrangement, oscillator generator, pulse technique, etc., can solve the problems of circuits introducing distortions and/or delays in low-voltage signals, level-shifting circuits may not function properly, etc., to prevent incorrect operation and unnecessary power use

Inactive Publication Date: 2005-08-25
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The invention arises, in part, from the realization that a voltage level shifting circuit can include an enabling circuit to prevent incorrect operation and unnecessary power use when an internal voltage supply is not ready for normal operation. The invention also arises, in part, from the realization that a voltage level shifting circuit can include a signal stabilizing circuit to improve, for example, the shape and delay characteristics of a shifted signal.

Problems solved by technology

Unfortunately, a level-shifting circuit may fail to function properly when an internal voltage supply is producing less than its full operating voltage.
Moreover, level-shifting circuits can introduce distortions and / or delays in the low-voltage signals that they convert to high-voltage signals.

Method used

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Embodiment Construction

[0027] This invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,”“comprising,” or “having,”“containing”, “involving”, and variations thereof herein, is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0028] The term “connected” is herein used to refer to components that are either in direct or indirect electrical communication. A direct connection is an uninterrupted interconnect pathway having an essentially non-variable resistance. An indirect connection includes additional components, such as transistors. Thus, an indirect connection can be variable. F...

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Abstract

A voltage level translator provides an output signal having an external voltage in response to an input signal having an internal voltage. The voltage level translator includes first and second input signal transistors, first and second output signal transistors, and includes a signal stabilization circuit and/or an enable circuit. A ready-signal generation circuit provides a ready signal indicating that a voltage supply is at an operating voltage. The ready-signal generation circuit can include unbalanced transistors.

Description

BACKGROUND OF INVENTION [0001] 1. Field of Invention [0002] The invention relates to operating voltage levels of integrated circuits. In particular, the invention relates to apparatus and methods for translating voltage levels of signals traveling between integrated circuits that operate at different voltage levels. [0003] 2. Discussion of Related Art [0004] Electronic systems often include circuits that operate at relatively low voltages, at times including core logic circuits and memory circuits, and other circuits that operate at higher voltages. Such mixed-mode voltage systems typically require voltage translation and voltage clamping capabilities. Voltage translation components allow proper communication of the I / O signals traveling between circuits operating at different voltage levels. [0005] Circuits that employ transistors having smaller gate dimensions typically require an associated decrease in supply voltage level. Microprocessors and memory circuits, for example, often ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03B1/00H03K3/356H03K5/153H03K17/10
CPCH03K17/102H03K3/356113
Inventor JOHANSSON, BRIAN DAVIDPATTERSON, STUART
Owner ANALOG DEVICES INC
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