Unable to find a Non inverting Schmitt trigger (OCT/HEX) SOIC buffer

[arjunprabu]

Hello All,

I Need a Non inverting Schmitt trigger (OCT/HEX) SOIC buffer that can drive an output current of more than 10mA. I am using this to unload the dspic output pins.

I tried searching online, but I cannot get a package with more than 3 buffers (Triple).

Any help is appreciated.

Thank you.

 

[Analog Ground]

74HC7541D or 74HCT7541D (Octal, from NXP or others) Watch out for the maximum total supply or ground current. At 10mA per gate, you are probably over the max for an SOIC package. Anyway, try looking for a variation on the "541" type of parts. Why do you need Schmitt trigger inputs for a signal from a dspic? This signal should be clean.

 

[arjunprabu]

Thank you for your reply.

There are two reasons why i am being specific in search of this part.

1.) Firstly i want to unload the dspic digital output pins, so as to lower the high frequency currents flowing into the digital ground. (I am doing this to get a stable digital ground, which is net-tied to the ADC ground)

2.) I wanted a schmitt trigger output to keep the digital signals clean due to switching transients.

74HC7541D can only sink/source 7.8mA max.


Other devices i found are

1.) https://www.onsemi.com/pub_link/Collateral/NL37WZ17-D.PDF (Needed atleast Hex package)
2.) https://www.ti.com/lit/ds/symlink/sn74lv8151.pdf (Non Stock item)

Thank you.

-Arjun

 

[dick_freebird]

Distinguish between a rating-point, like a VOL@IOL spec,
and the actual maximum current obtainable, and the maximum
current sustainable over the long term.

You might be better off using something like a standard Schmitt
inverter and driving the input of some more stout "power switch";
for example I have made E-loads using hex 74HC14 Schmitts
and small surface mount logic level NMOSFETs. Then you are
really not limited in output current anymore, just have to eat
board area. Your local power dissipation will drop, though, as
the FETs are way less dissipative (Ron).