3.3v转5v 电平转换方法参考（3.3V 5V level conversion method）.docVIP

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3.3v转5v 电平转换方法参考（3.3V 5V level conversion method）.doc

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3.3v转5v 电平转换方法参考（3.3V 5V level conversion method）

3.3v转5v 电平转换方法参考（3.3V 5V level conversion method） 3.3V 5V level conversion method Level conversion The transistor + pull-up resistor method Is a bipolar transistor or MOSFET, C/D take a pull-up resistor to a positive power input level, output level is very flexible, generally positive power level. (2) OC/OD device + pull-up resistor method 1) with similar. Applicable to the outputs of the devices just for OC/OD. (3) 74xHCT series chip boost (3.3V to 5V) 5V CMOS and 5V TTL level input devices that are compatible with 3.3V, can be used as 5V level conversion. This is due to the level of 3.3V CMOS and 5V TTL compatible (just a coincidence), while the output level CMOS is always close to the power level. Such as 74xHCT choose cheap (HCT/AHCT/VHCT/AHCT1G/VHCT1G/...) series (the T said TTL compatible). (4) input method (5V, blood pressure gauge 3.3V, 3.3V, 1.8V,...) That allows the input logic device level exceeds the power supply, can be used as a lower level. Here the overrun means more than power, many older devices are not allowed to exceed the input voltage of power supply, but more and more new devices to cancel this limit (to change the input protection circuit). For example, 74AHC/VHC series chip, the datasheets clearly marked the input voltage range is 0~5.5V, if the 3.3V power supply, can achieve 5V and 3.3V level conversion. (5) special level conversion chip The most famous is the 164245, not only can be used as a step-up / step-down power supply, and allow both sides of synchronization. This is the most general level conversion scheme, but it is very expensive (I bought not long ago or $45/, although it is also expensive retail, scary), so if not necessary, the best use of the first two programs. (6) resistance pressure method One of the easiest ways to reduce the level of. The 5V level, the 1.6k+3.3k resistor divider, is 3.3V. (7) the current limiting resistor method If you above two resistance too much, sometimes can only be connected to a current limiting r