SN74LVC1G74: Project schematic review

Jimmy Huang

Genius 3575 points

Part Number: SN74LVC1G74

Hello：

Please assist in conducting a review of the MC project schematic about SN74LVC1G74

Due to the urgency of the project, we hope to receive feedback as soon as possible. Thanks!!!

over 1 year ago

0 Malcolm Lyn over 1 year ago

TI__Mastermind 27340 points

The schematic looks ok. It depends on the transition time of the signal on the D pin: the RC delay created from the resistor on /Q and the capacitor could violate input transition rate requirements.

0 Jimmy Huang over 1 year ago in reply to Malcolm Lyn

Genius 3575 points

Hi Malcolm：

Regarding SN74LVC1G74, What are the appropriate pull-up resistance values for the D pin and/PRE pin, respectively?

0 Malcolm Lyn over 1 year ago in reply to Jimmy Huang

TI__Mastermind 27340 points

That depends, see here: (+) [FAQ] How do I size pull-up or pull-down resistors? - Logic forum - Logic - TI E2E support forums

For the D pin it depends on how it effects the rise time of the signal. That would be something you'd have to measure.