Spehro Pefhany wrote:

> At 12:29 PM 11/2/2005 -0700, you wrote:
>
>> Peter wrote:
>>
>>> I prefer CD4094 + CD4021 for this sort of application. Voltage range 
>>> is 3 to 15V ;-) It's only the good stuff they don't make anymore (or 
>>> so they say - I think that these chips will be around forever).
>>>
>>> Peter
>>
>> I like the LV595 if below 5V and HC595 if 5V. The advantage is that 
>> these
>> chips are VERY gutsy, can deliver 25mA ea at either rail all day long.
>>
>> --Bob
>
>
> Yes, abs. max. is 35mA on the Qn outputs, but it's pretty easy to exceed
> the maximum Icc or Ignd rating of 70mA. 8-(
>
Rarely are more than one or two outputs driving that hard at the same 
time, unless
you are driving LED arrays. I've never run into a problem with 
overheating. Most of
my designs have one or two external 25mA source/sinks, then the rest of 
the device
is simple logic controls.

--Bob

> Best regards,
>
> Spehro Pefhany --"it's the network..."            "The Journey is the 
> reward"
> speff@interlog.com             Info for manufacturers: 
> http://www.trexon.com
> Embedded software/hardware/analog  Info for designers:  
> http://www.speff.com
> ->> Inexpensive test equipment & parts 
> http://search.ebay.com/_W0QQsassZspeff
>
>


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