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Need information for building an IC tester for TTL and CMOS

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wpm

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IC-tester

Hi,

I want to build an IC tester for TTL and CMOS.
Where can I find informations, circuits etc. ?
 

Roel

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IC-tester

What do you want to build? And what do you want to test?

Do you want to test each and every IC from the 74HCxx, 74HCTxx, 74ACxx, 74LVxx, 74LVTxx, ........... series? In that case it's gonna be a difficult job.
If you just want to test the logic circuitry of a 74xxxx IC, not the voltage levels, I would recommand to develop a user interface (with a display and a keyboard where you can select which IC is in your test socket (for example, a74xx244, then you have to test a sequence of inputs and see if the outputs are correct). I think you need a microcontroller with a quite big memory for that. You have to store for each IC the necessary test inputs and the expected outputs. Maybe it's easier to use a FPGA or a PAL/MACH for those test sequences, combined with a microcontroller for the user interface.
But it looks quite interesting project. Well suited for a student to build.

Roel
 

Fragrance

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Please find it

Ok

you do the following things first go at
www.epemag.wimborne.co.uk

then browse to fttp server pub pic and download a pic micro based design
for digital ic-tester
also download the oct 2002 mag from mcu forum for schmetic

broowse to e-book the mag then epe

regards
Fragrance
 

wpm

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IC TESTER

I want only test if a IC is defect.

Wim
 

dpechman

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so try one protoboard+PSU regulated 5Vcc+multimeter+databook.
 

BENOIT

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Re: IC-tester

at this resource page
you have software and schematics to build a Universal Programmer
and tester
http://matthieu.benoit.free.fr/all03/source.htm
this can be actually done for now in wrapping .
with regards,
MB.


wpm said:
Hi,

I want to build an IC tester for TTL and CMOS.
Where can I find informations, circuits etc. ?
 

Fragrance

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Re: IC-tester

BENOIT said:
at this resource page
you have software and schematics to build a Universal Programmer
and tester
http://matthieu.benoit.free.fr/all03/source.htm
this can be actually done for now in wrapping .
with regards,
MB.


wpm said:
Hi,

I want to build an IC tester for TTL and CMOS.
Where can I find informations, circuits etc. ?
Which i told you on epe thats checks the both cmos and ttl also
regards
Fragrance
 

luben111

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Hi,

I used to build many years ago such tester.

I used one non standart approach - signature analyze and pseudorandom generating of input stimulus. The result was amazing (14 years ago) - I reached 100MHz real time test operation (to test schemes with paterns with 100MHz frequency).

The programming of new parts is very yeasy - you just say what is input and what is output and on the inputs you apply pseudorandom sequence. Then you just record the signature from working chip. If the new chip yield other signature - it's damaged.

I think that with the current technology you can build with this approach up to 1 GHz tester.

If you need more information - just contact me via email.

Regards
Luben Christov
 

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