• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 3 answers
  • Subscribers 18 subscribers
  • Views 263 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CD74HC4067: 1 to 12 part chosen

Corry Weng
Expert 6450 points
Part Number: CD74HC4067
Other Parts Discussed in Thread: TMUX1208, SN74HCS151

Tool/software:

Hi team,

I am searching 1: 12 mux on TI web but I only find CD74HC4067, which I think is too old.

Is this part still recommended?

The requirement I want is as below:

1

architecture same as TUX1208 

2

application voltage 3.3V.

3. single direction is enough

Can CD74HC4067 meet the requirement above?

if this is not recommended anymore, any other part suggested

Thanks

Corry

  • 0
    TI__Genius 17375 points

    Hello Corry,

    Yes, the CD74HC4067 can still be used in new designs.
    Note, the configuration is 16:1 so four of the input pins need to be tied together to create a 12:1 mux. 

    I am not sure exactly what do you mean by same architecture. The TMUX1208 is a GPIO controlled 8:1 mux, while the CD74HC4067 is also a GPIO controlled, but 16:1 mux.
    They are both bidirectional and can work with 3.3V.

    Thanks,

    Nir  

  • 0 in reply to Nir Gilgur
    TI__Expert 6450 points

    HI Nir,

    I am using this part to have a switch on 25MHZ clk.

    is this suitable?

    and how much is the delay?

    Thanks

    Corry

  • 0 in reply to Corry Weng
    Guru 316220 points

    The CD74HC4067 has an analog bandwidth of 89 MHz, so a digital 25 MHz signal will get through, but with slower edges.

    A switch behaves like a small resistor, so the propagation delay usually is very small. But when you go near the bandwidth limit, then the edges will be slowed down by the low-pass filter formed by RON and CCOM.

    There is no other 16:1 switch for 3.3 V. There are digital, buffered multiplexers like the SN74HCS151, but only as 8:1, so the propagation delays of two cascaded multiplexers would add up.

  • 0 in reply to Clemens Ladisch
    TI__Expert 6450 points

    Hi Clemens,

    few questions

    1.

    how to distinguish TSSOP package by part number?

    2.

    By using CD74HC4067, how to config the direction of this mux? (ex.. clk from left to right or right to left? )

    Thanks

    Corry

  • 0 in reply to Corry Weng
    Guru 316220 points

    1. Devices in the TSSOP package have the PW suffix. The CD74HC4067 is not available in the TSSOP package.

    2. Analog switches are bidirectional.

  • 0 in reply to Clemens Ladisch
    TI__Expert 6450 points

    Hi Clemens,

    So TSSOP is not MP?

    For example, if my S0~S3 are 1111, is it mean that my CLK signal can either from channel 15 (=I15=pin 16) to pin 1 (common output)?

    Thanks

    Corry

  • 0 in reply to Corry Weng
    Guru 316220 points

    The TMUX1208 would be available in TSSOP.

    A closed switch behaves like a small resistor; this is similar to a mechanical switch.