From the data sheet:

http://focus.ti.com/lit/ds/symlink/sn74hc595.pdf

Up to 15 LSTTL loads
Continuous output current, IO (VO =3D 0 to VCC) =B135 mA
Continuous current through VCC or GND =B170 mA
=B16-mA Output Drive at 5 V (This is the one I live by.)

I use these all the time with the low current AlGAs LEDs, about 2 or 3
mA each.  I'd be wary about using a lot of regular LEDs.  Go to the
TPIC6C595 or TPIC6595, NOT the TPIC6B595 as kicked around last week I
believe.

Bill

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Bob Axtell
Sent: Tuesday, February 10, 2004 7:29 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:] multiplex 7seg LED with drivers


Wouter van Ooijen wrote:

>>The 74HC595 is hefty BUS-driver part, and can pump a lot of
>
>
> What is the maximum (peak and average if they differ) current for a=20
> HC595 output pin? I recall reading the datasheet but not finding this=20
> info.
>
> Wouter van Ooijen

I don't think I've seen a spec, either, but I think I calculated about
40mA sink/source.

--Bob

--

              --------------
                Bob Axtell
        PIC Hardware & Firmware Dev
          http://beam.to/baxtell
              1-520-219-2363

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu