SN74AUC1G07: SN74AUC1G07

Youry Kirpichnikov1

Prodigy 170 points

Part Number: SN74AUC1G07
Other Parts Discussed in Thread: SN74AUC1G125

What is the maximum frequency for this Open Drain gate and how a pull up value will affect it?

I see AUC series will work above 175MHz but this is an Open drain one, will be the same?

Regards,

Youry

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 316470 points

With an open-drain device, the speed of rising edges is limited by the low-pass filter formed by the pull-up resistor and any trace/device capacitances.

In general, you would not use an open-drain output if speed matters. What is the actual problem you're trying to solve?

0 Youry Kirpichnikov1 over 1 year ago in reply to Clemens Ladisch

Prodigy 170 points

Trying to solve SI issue with a multi-device SPI bus MISO signal with about 33MHz frequency.

0 Clemens Ladisch over 1 year ago in reply to Youry Kirpichnikov1

Guru 316470 points

And why did you choose an open-drain buffer?

To combine multiple MISO signals, you need three-state buffers like the SN74AUC1G125. (Their /OE can be controlled with the respective /CS.)

0 Youry Kirpichnikov1 over 1 year ago in reply to Clemens Ladisch

Prodigy 170 points

Thank you, I will

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SN74AUC1G07: SN74AUC1G07