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US 6,552,568 B2Granted
Level shifter circuit for level adjustment
AssigneePhoenix Contact GmbH & Co. KG
InventorRainer Esch
Life of this patent
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Abstract
Apparatuses for level adjustment are essential to make adjustments to signals between integrated circuits having differing signal levels in electronic circuits. To assure signal adjustment for a large number of signals, as occur in parallel busses, an apparatus for level adjustment is used. This digital level adjustment uses the I/O cells already present in the integrated circuits with an externally wired pullup resistor and an internal digitally programmed or constructed signal connection for controlling output drivers.
Claims9
An integrated circuit, comprising:
- a) an output driver having a low signal voltage;
- b) a digital logic gate coupled to the output driver;
- c) an input buffer providing a feed-back looped input from the output driver to the digital logic gate;
- d) an output terminal coupled to the output driver;
- and
- e) a pullup resistor;
- wherein the pullup resistor is connected to the output terminal and an output signal of the output driver is adjusted from the low signal voltage to a second integrated circuit having a high signal voltage, to increase the output signal from the low signal level to the high signal level;
- wherein the output driver is switched inactive for the period during which the level of the output signal from said output terminal is increased across the pullup resistor by the level difference between the low signal level and the high signal level.
5 more elements
An integrated circuit, comprising:
- a) an output driver having a low signal voltage;
- b) a digital logic gate coupled to the output driver;
- c) an input buffer providing a feed-back looped input from the output driver to the digital logic gate and the input signal for bidirectional application with bidirectional functionality to the digital part;
- d) an output terminal coupled to the output driver;
- and
- e) a pullup resistor;
- wherein the pullup resistor is connected to the output terminal and an output signal of the output driver is adjusted from the low signal voltage to a second integrated circuit having a high signal voltage, to increase the output signal from the low signal level to the high signal level;
- and
- wherein the output driver is switched inactive for the period during which the level of the output signal from said output terminal is increased across the pullup resistor by the level difference between the low signal level and the high signal level.
6 more elements
Dependencies are inferred from the claim text.