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Original question:

SN74CB3Q3244: Some spec about SN74CB3Q3244

SN74CB3Q3244: About the output state of SN74CB3Q3244

Andy Liu3
Intellectual 2500 points
Part Number: SN74CB3Q3244

Hi team.

I see SN74CB3Q3244 have a charge pump that can support 0~5.5V output;

So I want to ask three more questions:

1. What's the output type of SN74CB3Q3244, Is it a bidirectional NFET?

2. Can the input voltage of different channels be different?, for example, Vcc uses 3.3V, some channels input 3.3V, and some channels input 5V;

3. Can the input and output voltages of I/O be different, I mean pulled up the output I/O; for example, input 3.3V, output with 5V pull-up, is this okay?

Best regards,

Andy Liu

  • 0
    Guru 316400 points

    1. Yes, a switch consists of a single N-channel MOSFET.

    2. This is an analog switch; you can use any voltage inside the valid range.

    3. The two sides are connected directly through the switch. A higher voltage on one side can pull up the voltage on the other side. If you need level shifting, consider a CB3T device, or a TXS/LSF level shifter.

  • 0
    TI__Genius 10974 points

    Hi Andy,

    To answer your questions, see below:

    1) This device uses a bidirectional NFET with charge pump architecture.

    2) As long as the input signals fall within the supported range based on your VCC (0-5V switching on a 3.3V VCC and 0-3.3V on a 2.5V VCC), the inputs can be any voltage you please.

    3) Since the input and output are shorted together when the channel is connected, this may not be practical to try to achieve. If you are trying to level shift the input/output, we do have level shifting multiplexers we can suggest to help here.

    Let me know if you have any other inquiries.

    Thanks!

    Bryan