하드웨어 > Level Shifting Made Easy with the 74LVC06A and 74LVC07A

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작성자 키트 작성일2017-08-25 09:28 조회1,879회 댓글0건

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Level Shifting Made Easy with the 74LVC06A and 74LVC07A
To level shift down from a 5V system you can use a simple open drain buffer as a solution. The 74LVC06A is an open drain inverting buffer, and the 74LVC07A is and open drain non-inverting buffer. These devices are 3.3V counterparts to the popular 74F06 and 74F07 5V parts.
The LVC inputs are 5V tolerant and can connect to 5V devices. Since the outputs are open drain, they will shift the output VOH level to the chosen pull-up voltage (e.g., 3.3V or 2.5V). At V_CC=3.3V, the V_OL level is still guaranteed to be 0.55V maximum. JEDEC standards specify V_IH and V_IL levels of 2.0V and 0.8V for 3.3V systems and V_IH and V_IL levels of 1.7V and 0.7V for 2.5V systems. The LVC06A and LVC07A can be used to level shift down from a 5V system to a 3V or 2.5V system and still meet the input threshold voltage requirements.
To level shift up from a 3.3V system to drive 5V CMOS input levels, simply connect the LVC output to a 5V termination voltage through a pullup resistor as shown below. The outputs of these devices are 5V tolerant and provide a simple solution to drive 5V CMOS input levels.

http://ics.nxp.com/support/techtips/simpleshifter/

These hex buffers/drivers feature high-voltage open-collector outputs to interface with high-level circuits or for driving high-current loads. They are also characterized for use as buffers for driving TTL inputs.
The ’LS07 devices have a rated output voltage of 30 V, and the SN74LS17 has a rated output voltage of 15 V. The maximum sink current is 30 mA for the
SN54LS07 and 40 mA for the SN74LS07 and SN74LS17.

출력은 30V까지 가능 하므로
5V 입력으로 12V 레벨로 올리기 위해서도 사용 할 수 있습니다.

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