Message	Date	From	Subject
14029	2017-06-17 21:08:23	AD7ZU	3.3v TI 3253 mux as a QSD?
Any experience with 3.3v TI 3253 mux as a QSD? I had built a couple of projects using the Fairchild FST3253s which is a 5v part. In both instances the level translation from Si570 was in the Dflops I would like to eliminate the 4x divider and use Si5351 to directly drive the 3.3v, SN74CBT3253C, not to be confused with SN74CB3Q3253RGYR which uses a charge pump to boost the gate voltage but has a limited switching speed of 20mhz. I didn’t see any issues reading the data sheet but the lore is that the TI parts are not suitable ..could be the limited switching rate of charge pump version? Im going straight to a pcb with this design so thought I would ask before committing Randy AD7ZU
14031	2017-06-18 09:17:51	Tayloe, Dan (Noki...	Re: 3.3v TI 3253 mux as a QSD?
The NC2030 kit I did for Norcal a few years ago used this part in a 3v phasing receiver. It produced a pretty stout receiver. - Dan, N7VE Sent from my T-Mobile 4G LTE device ------ Original message------ From: AD7ZU ad7zu@yahoo.com [emrfd] Date: Sat, Jun 17, 2017 9:08 PM To: yahoogroups; Cc: Subject:[emrfd] 3.3v TI 3253 mux as a QSD? Any experience with 3.3v TI 3253 mux as a QSD? I had built a couple of projects using the Fairchild FST3253s which is a 5v part. In both instances the level translation from Si570 was in the Dflops I would like to eliminate the 4x divider and use Si5351 to directly drive the 3.3v, SN74CBT3253C, not to be confused with SN74CB3Q3253RGYR which uses a charge pump to boost the gate voltage but has a limited switching speed of 20mhz. I didn’t see any issues reading the data sheet but the lore is that the TI parts are not suitable ..could be the limited switching rate of charge pump version? Im going straight to a pcb with this design so thought I would ask before committing Randy AD7ZU

The NC2030 kit I did for Norcal a few years ago used this part in a 3v phasing receiver. It produced a pretty stout receiver.

- Dan, N7VE

Sent from my T-Mobile 4G LTE device

------ Original message------

From: AD7ZU ad7zu@yahoo.com [emrfd]

Date: Sat, Jun 17, 2017 9:08 PM

To: yahoogroups;

Cc:

Subject:[emrfd] 3.3v TI 3253 mux as a QSD?

Any experience with 3.3v TI 3253 mux as a QSD?

I had built a couple of projects using the Fairchild FST3253s which is a 5v part. In both instances the level translation from Si570 was in the Dflops

I would like to eliminate the 4x divider and use Si5351 to directly drive the 3.3v, SN74CBT3253C, not to be confused with SN74CB3Q3253RGYR which uses a charge pump to boost the gate voltage but has a limited switching speed of 20mhz.

I didn’t see any issues reading the data sheet but the lore is that the TI parts are not suitable ..could be the limited switching rate of charge pump version?

Im going straight to a pcb with this design so thought I would ask before committing

Randy

AD7ZU