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My crystal ball is a bit cloudy bss138 datasheet afternoon. You may be able to get 1MHz from the transistor you want to use if you don’t mind very rounded edges. As expected, xatasheet AOA performs badly oat this frequency. Sign up using Email and Password.

BSS Datasheet(PDF) – Fairchild Semiconductor

As you guessed it was easy bbss138 understand up-shifting. By using our site, bss138 datasheet acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I bss138 datasheet easy to build level shifter circuit at SparkFun website. For simplicity bss138 datasheet the explanation, I’ll assume that LV is 3. When the input pin is high, there is nothing in the circuit pulling the output down.

TL;DR; It will work, but it will be slow. fatasheet

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You can simulate it or build bss138 datasheet and test it. The input pin is sinking current from both R3 and R4. I’ve added a bit on how the circuit works.

If you don’t care at all about speed it dahasheet work. As such it will be pulled up bss138 datasheet 3. Sign up using Facebook. Probably no more than kHz data rate. These capacitors will also act to slow the circuit down.

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If you reduce the pullup resistor you can gain some bss138 datasheet the speed back but whatever is driving it will have to sink more current and have an appropriately low output voltage to yield enough noise immunity and the power consumption will be higher.

When the input is pulled low, the body diode of the MOSFET which goes from source to drain will start conducting and pull the output down. It was also for a device that was very sensitive to rounding bss138 datasheet the signal edges it was an SPI flash device.

Questions Tags Users Badges Unanswered. Speed is already pretty bss138 datasheet because of the bss138 datasheet pullup and other capacitance.

Do a simulation and see if it will exceed your exact requirements by a sufficient margin. Up to what speed it will be safe to use? It is using BSS datasheet which Datasneet don’t have. In fact, I don’t know exactly how this bss138 datasheet works! A larger on-resistance will slow down the falling edge slightly, but given the rising edge is entirely driven by bss138 datasheet pull-up resistor fatasheet, the level shifter is no good for high-speed circuits any-way a few MHz tops depending on trace length and capacitive load.

Junaid I’ve gotten 4MHz bss138 datasheet of this type of level shifter before by using 2. Once the MOSFET turns on, the output voltage will then drop towards bss138 datasheet as the current through Hss138 flows through the channel rather than the bss138 datasheet diode.

How it works I’ll add a bit about how the circuit works for completeness. Down-shifting with input high is also not hard to understand.

I’ll add a bit about how the circuit bss138 datasheet for completeness. The higher the capacitance, the slower the circuit.

The capacitance has the biggest impact in down-shifting on both rising and falling edges. Thanks for detailed explanation! bss138 datasheet

By clicking “Post Your Answer”, you acknowledge that you have bss138 datasheet our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. When the input is pulled low, the source will be at 0V, but the bss138 datasheet will remain at 3. This compares to only datasheett 40ns rise time for the BSS I am asking this because Bss138 datasheet don’t have yet AOA to test.

Need to learn how to simulate circuits: The channel resistance essentially acts as a potential divider with R4 or R3 when the output is pulled low. A screenshot of the results is shown bss138 datasheet in case the URL breaks.