SN74ACT244: Could SN74ACT244 support 10Mhz signal input?

Yuting Li

Part Number: SN74ACT244

Hi team,

Could SN74ACT244 support 5V or 3.3V, 10Mhz signal input? Does it depend on Δt/Δv ? Thanks

Tim

0 Clemens Ladisch over 4 years ago

Guru 316440 points

Δt/Δv is a limit on the slope of the edges. This is independent from the distance between the edges.

In other words: CMOS inputs need fast edges, but have no lower limit on the signal frequency.

ACT supports any data rate between DC and 125 Mbps.

0 Yuting Li over 4 years ago in reply to Clemens Ladisch

Hi Clemens,

Thanks for your reply. If there is 5V input, the shortest rise time of edge is 8ns/V * 5V = 40ns, right?

0 Clemens Ladisch over 4 years ago in reply to Yuting Li

Guru 316440 points

The Δt/Δv limit forbids slow edges. It does not forbid fast edges, so it is not related to the device's frequency limit.

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