SN74AUC1G125: Can SN74AUC1G125 support 125MHz at 1.8Vcc?

Alan Chang

Part Number: SN74AUC1G125

Hi,

On data sheet, 10ns/V is max. SR at 1.8V. So the rising / rising time will be 10*1.8 = 18ns, right? In other words, the max. freq. is 1/36ns = 27.78MHz only at 1.8V. Is it correct?

Is there part suggestion for 125MHz/ 1.8V?

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 290400 points

The Δt/Δv value is the maximum; your input signals are allowed to be faster.

With a 15 pF load, the maximum propagation delay is 1.5 ns, which corresponds to 333 Mhz.

0 Owen Westfall over 2 years ago

TI__Genius 9321 points

Hi Alan

To clarify Clemens Δt/Δv is used to refer to how slow your rising edge is allowed to be before you might have issues relating to a slow input signal. You are meant to operate under this maximum time.

Clemens Ladisch said:
With a 15 pF load, the maximum propagation delay is 1.5 ns, which corresponds to 333 Mhz.

This device I is officially rated to 275 MHz (Looking at SN74AUC1G74), but given it's not a clocked device it's actual max could be closer to what Clemens put.

Regards,

Owen

0 Alan Chang over 2 years ago in reply to Owen Westfall

TI__Intellectual 2260 points

Hi Owen,

the rising/ falling time is 0.75ns max. at 1.8V. so looks like no issue at 125MHz with 1.8Vcc, right?

0 Owen Westfall over 2 years ago in reply to Alan Chang

TI__Genius 9321 points

Yes no issue

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SN74AUC1G125: Can SN74AUC1G125 support 125MHz at 1.8Vcc?