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Rail to rail enable signal and level conversion circuit

A conversion circuit, control circuit technology, applied in the automatic control of power, logic circuit coupling/interface using field effect transistors, logic circuits, etc.

Active Publication Date: 2013-09-18
FAIRCHILD SEMICON SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, in order to solve the problem of providing an enable control signal in the prior art, the main purpose of the present invention is to provide a control method, circuit and level conversion circuit for a rail-to-rail enable signal

Method used

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  • Rail to rail enable signal and level conversion circuit
  • Rail to rail enable signal and level conversion circuit
  • Rail to rail enable signal and level conversion circuit

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Experimental program
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Embodiment Construction

[0021] The basic idea of ​​the present invention is: the first signal of the input signal of the control circuit is connected to the level conversion circuit; the level conversion circuit performs enabling control according to the high and low levels of the first signal; Output disable signal when power is off.

[0022] Specifically, when the power supply voltage is normal, the level conversion circuit outputs the enabling signal according to the high level of the first signal, and outputs the disabling signal according to the low level of the first signal; when the power supply is powered off, the level conversion circuit Outputting the disable signal directly according to the low level of the first signal.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present invention realizes a control method of a rail-to-rail enable signal, such as figure 2 As shown, the method...

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Abstract

The invention discloses a rail to rail enable signal control method. A first signal of an input signal of a control circuit accesses a level conversion circuit. The level conversion circuit carries out enable control according to high and low level of the first signal. The level conversion circuit outputs an enable signal when a power supply loses power. The invention further disclosed is a rail to rail enable signal control circuit and the level conversion circuit. Through the scheme of the invention, a corresponding rail to rail enable control signal is output according to high and low level of the input signal when the voltage of the power supply is normal; and when the power supply loses power, the enable signal is normally output, so as to provide the accurate enable control signal for a device under enable control.

Description

technical field [0001] The invention relates to enabling signal control technology, in particular to a rail-to-rail (Rail-to-Rail) enabling signal control method, circuit and level conversion circuit. Background technique [0002] With the continuous emergence of digital integrated circuits (ICs) with different operating voltages, the necessity of logic level conversion is more prominent, and the level conversion method will also change with the logic voltage, data bus form, and data transmission rate. The form of the data bus may be a four-wire serial peripheral interface (SPI, Serial Peripheral Interface), a 32-bit parallel data bus, and the like. Now, although many logic chips can realize the control of the rail-to-rail enable signal, when the power is turned off, the logic chip will stop working, the output of the rail-to-rail enable signal is confused, and the disable signal cannot be output correctly. [0003] Such as figure 1 The control circuit of the rail-to-rail ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0185
CPCH03K3/35613H03K19/018521H03L5/00
Inventor 黄雷
Owner FAIRCHILD SEMICON SUZHOU