SN74AVC4T245: D/S Description Question

Qiang Ren

Intellectual 1325 points

Part Number: SN74AVC4T245
Other Parts Discussed in Thread: SN74AVC2T245

Team,

I'm confused about SN74AVC2T245 datasheet as below, can you help me with it? Thanks!

What's Vtp? Why we should have Vtp considered when calculating Tplz and Tphz?

11 months ago

0 Michael Ikwuyum 11 months ago

TI__Mastermind 29490 points

Hi Qiang,

Vtp is the threshold for a PMOS transistor. To turn OFF a pFET, gate voltage Vg > Vtp and Vg < Vtp to ON.

Hence, Vtp is considered when calculating the enable / disable time (i.e time to go from off-state Hi-z to a defined High/Low or from a defined High/Low level to off-state Hi-z), thanks.

Best Regards,

Michael.

Logic

Logic forum

SN74AVC4T245: D/S Description Question