SN74AHC245: SN74AHC245 bandwidth

Roy Chou1

Genius 13445 points

Part Number: SN74AHC245
Other Parts Discussed in Thread: SN74AHC74

Hi team,

Can you provide the recommended max BW of SN74AHC245?

Or can you provide me the related calculation that you could calculate the max BW? I think it's related to tr and tf.

Roy

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 266330 points

0 Emrys Maier over 3 years ago

TI__Guru* 96681 points

Hi Roy,

We have an FAQ on this topic here: (+) [FAQ] What is the maximum data rate (or operating frequency) for a logic gate or buffer? - Logic forum - Logic - TI E2E support forums

For the AHC245 operating at 5V, I would expect it to work up to 110 MHz with a light load (15 pF) or up to 75 MHz with a relatively heavy load (50 pF).

This comes from the SN74AHC74 datasheet: