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Part Number: SN74CB3Q3257
We are using the SN74CB3Q3257 (4 channels ,2:1, Multiplexer) in our application.
The supply voltage is 3.3V, so the Vs must >2V to control. But the Vs voltage from MCU now is 1.8V.
Can we add a trido from 3.3V to enhance the drive voltage?
Or can use Vcc=1.8V when the Vin=1.8V?
In addition, do we have device which selected pin voltage is 1.8V compatible.
Vin=1.8V(SPI up to 32MHz) and Vcc can be 1.8V ,3.3V, 5V
Unfortunately, the SN74CB3Q3257 is not going to be compatible with the change in the application. However we do have alternatives.
The first is the TMUX1574 is a replacement of the SN74CB3Q3257, and is pin to pin for the PW packages, and supports 1.8V logic signaling. It has a nominal -3dB bandwidth of 2GHz so there shouldn’t be any issue. It can work at a VCC = 1.5V to 5.5V.
The second is the SN3257-Q1, it is a pin to pin replacement of the SN74CB3Q57; however, it does have a lower current rating ( 30 mA instead of 50mA). It does have 1.8V compatible logic. It can work at VCC = 1.5V to 5.5V and can pass the signal needed.
If you have any other questions please feel free to reach out to me!
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