MDC buffer part number required

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Attaching the configuration of MDC and MDIO.

One master is used to configure 9 slaves. Kindly do revert with a suitable buffer part number.

Regards

Shilpa

Hello Shilpa,

Can you provide more detail around controller vs peripheral voltage?

Do you need translation or just buffering?

Are you expecting large capacitances on the lines?

Are you expecting there to be any communication from the peripheral back to the controller, or are the signals fixed direction?

Best,
Michael

Hello Michael,

Plz find below answers:

Controller and Peripheral are at 3.3V

Only Buffering is required

There is no capacitance on the line. Other than the trace capacitance. Trace length maximum of 5 inches

It is only a Clock and hence is only from Controller to Periheral and not other side.

Regards

Shilpa

For a single unidirectional signal, use a plain buffer like the SN74LVC1G34.

Hi

It is one source(Controller) and a maximum of 9 slave devices (Peripherals). Every device to operate independently. Not all Slaves will be configured at once.

Is there any other Buffer IC or a clock buffer dedicated for MDC applications (Used to Configure Ethernet transceivers)

Plz suggest.

Regards

Shilpa

What do you mean with "operate independently"? Do you want to prevent some slaves from seeing the clock signal? Are you asking only about the clock signal, or about all MDC/MDIO signals?

I am discussing on the MDC line.

Can i use an IC with part number CDCLVC1110. With this i can drive the MDC line from the processor to all the Slave devices.

Plz ignore "operate independently". It is fine even if  some slaves see the clock signal.

Regards

Shilpa

A single logic buffer is more than enough to drive 5 inches to 9 slaves. The CDC device would also work, but in a simple application like this, its additional capabilities are not needed.

Hi

The total trace length is 15 inches. Was a typo error. Can i use a Single logic buffer as SN74LVC1G34 for MDC line with this trace length?

Also will this buffer work for low frequency of >100KHz and upto 20MHz?