I need an IC like 74HC244, but with |Iout|>20mA?

[leotim]

74hc244 and 74abt244

I need a logic buffer for 8-bit microcontroller port, like 74HC244, but with an output current of more than 20mA, to drive high current LED. Any suggestion?

 

[IanP]

74lvc244 74hc244

Check out the ACT series ..

Regards,
IanP

 

[shwoo]

74hc244 led buffer

If you don't have space for dedicated drivers, you might consider
74ABT244 which can sink 64mA and source 32mA.
Will this be enough?
Regards,
S. H.

 

[leotim]

ic 74hc244

Is there any document that describes AC, ACT, ABT families?

 

[power-twq]

74hc244 led

if your power is 3.3V, you can sonsider using TI's 74LVC244,

the speed is faster than 74HC244.

best regards

I need a logic buffer for 8-bit microcontroller port, like 74HC244, but with an output current of more than 20mA, to drive high current LED. Any suggestion?

 

[VSMVDD]

fan out 74hc244

**broken link removed**

74FR 244 60ma per i/o

if you need more than 50-60 ma you should use some fets

dont trust i/c's to switch heeps of current

 

[yonkiman]

I'm bumping this ancient thread because I think this is a good question and no one suggested one good option, which is to parallel multiple channels of an HC244 together. Most 244s claim a typical 6mA output drive (which I suspect is slightly conservative), so three 244 outputs tied together (with their inputs tied together as well, of course) should be able to source/sink 20mA. Just one more option to consider...

-Fred

 

[ark5230]

Could it make matter simple using power drivers like Darlington ULN 2803?

 

[yonkiman]

Sure, a Darlington would work too. It's just a good thing to know you can parallel identical FETs/CMOS logic and get higher current drive. A lot of times that's handy when you're only using a few of the channels in a device, but need more drive. You can use the unused channels to boost your drive.