Interfacing with HP-HIL

Jon Elson elson at
Sat May 7 16:00:31 CDT 2016

On 05/07/2016 02:05 PM, Jon Elson wrote:
> On 05/07/2016 12:35 PM, Chuck Guzis wrote:
>> On 05/06/2016 10:26 AM, Paul Koning wrote:
>>> I think a well chosen hearing aid tube can outperform a 
>>> classic (not
>>> L or LS) 7400 series IC.
>> This application sound like a perfect candidate for a CPLD.
> The Xilinx 9500 series of CPLDs are not low-power, by any 
> means. They have a formula in the data sheet and a power 
> calculator program, that are both WRONG!  They 
> underestimate power by a factor of 3!!  I reported this to 
> them, and they said I was right, but they were not going 
> to fix the documentation!  Sheesh!
> (The internal architecture is 36-input diode gates with 
> pull-up resistors.  You have two choices of resistor, 
> low-power and fast.)
> The Xilinx CoolRunner II is quite low power, basically a 
> CMOS FPGA architecture.
> Jon
Oh, but only the 9500 series is a 5V part.  The 9500 XL is 5 
V tolerant, but needs 3.3 V supply.


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