Need to find parts 82S23 / 74S188

[Eric Smith]

On 10/31/2010 10:11 AM, Chuck Guzis wrote:
> On 31 Oct 2010 at 8:28, Glen Slick wrote:
>
>    
>> On Sat, Oct 30, 2010 at 2:40 PM, Chuck Guzis<cclist at sydex.com>  wrote:
>>      
>>>> The bigger problem for me would be finding a programmer for these
>>>>          
>>> things.  I've got a mess of SN74S471s and no way to program them.>
>>>        
>> I have the Nat Semi DM74LS471 on the device list of my programmer, but
>> not the SN74S471.  Any chance the programming algorithms are the same?
>>      
> They probably are.  Somewhere in the history of TI part numbers, they
> changed some of the bipolar memories from the SN74xxx part number to
> TBPxxx.  I can't recall which way my parts are labeled, but they're
> 471s under the hood.
>    
True, but it has absolutely *nothing* to do with whether a National 
Semiconductor DM74LS471 uses the same programming algorithm and 
electrical parameters as the SN74S471.  They might, but it was not 
uncommon for different vendors to have parts that did NOT program in the 
same way.  They often did their own designs, with different types of 
fuses and materials, requiring different programming parameters.

Eric