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Stabilant 22 Contact Enhancer Technical Notes

Tech. Note 39 - Signal Rise Time & Stabilants

Background

In many "professional" computers the use of Socketed Integrated Circuits is avoided due to the lowered reliability of the Socketed I.C.'s. This is caused by a predisposition towards contact generated noise, signal loss in the contact means, and a slower rise time on waveforms. The latter is a consequence of the higher connector resistance in the signal lead together with the internal capacity of the I.C. The result of increased rise times is an occasional system failure, as certain signal paths are not enabled by other timing signals, within the "windows" necessary to keep the equipment operating.

Hypothesis

If the resistance in the I.C. Socket to I.C. pin contact means could be kept at a low level or lowered to that of a new I.C. Socket, then the rise time could be kept within the specifications necessary to maintain the critical timing of the signals.

Method

An old and unreliable S-100 type 64k memory board was set up on a connector extender in a Z- 80 based computer, and measurements were made of the rise time of the chip refresh signals using a very high impedance low capacity probe. The measurements were made:

  • A/ On the contact where it was soldered to the circuit board (on the back of the board) and,
  • B/ to the I.C. pin itself using needle sharp spring loaded probes so as not, in the latter case, to disturb the seating of the I.C. in its socket.

The measurements were made before and after the application of Stabilant to the I.C. contacts.

The procedure was duplicated on 10 of the memory chips.

Results

Upon using the stabilant there was an average reduction in rise time of 40% with one contact having a reduction of 70% in its signal rise time. The board, which had hitherto been unreliable, now functioned properly once all I.C.'s were treated.

Conclusions

The tests demonstrate that in the case of Dynamic Memory I.C.'s, the reduction in rise time could well be the difference in the I.C. performing acceptably, and failing.

Comments

If manufacturer did not require soldered-in-I.C.'s to ensure reliability, the cost of repairing boards because of bad I.C.'s could be reduced. Lower cost I.C.'s might be employed in manufacturing in the knowledge that a marginal I.C. could be replaced. This could cut the cost of parts.

Caution

With very high speed memory applications or where very high rise times are encountered, it must be remembered that the capacitance between adjacent contacts is increased by the application of Stabilants on the socket insulation. In most applications any effect of this added capacitance will be offset by the reduced resistance of the contact; however in very high speed applications using chip carriers with very small spacings between contacts it may be necessary to remove the IC's - applying the Stabilants only to the metal contacts themselves. This can be accomplished by using a piece of thin felt (saturated with Stabilant 22a) as the applicator. Remember, only a very thin film of Stabilant is needed in this type of application.

Revision 4


NATO/CAGE Supply Code 38948

The 15 mL size has NATO Part # 5999-21-900-6937


The Stabilants are patented in Canada - 1987; US Patent number 4696832. World-wide patents pending. Because the patents cover contacts treated with the material, a Point-of-sale License is granted with each purchase of the material.


MATERIAL SAFETY DATA SHEETS ARE AVAILABLE ON REQUEST


NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither D.W. Electrochemicals Ltd., their distributors or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.

Stabilant, Stabilant and product type variations thereof, are Trade Marks of D.W. Electrochemicals Ltd. Stabilant, Stabilant 22, and .the term "Contact Enhancer" is 1983 Wright Electroacoustics and is used with permission.

Copyright 1987,'88.'89.'90. 91 - D.W. Electrochemicals Ltd.

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Stabilant
Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.
Stabilant 22
APPLICATION NOTES
1. Electronic Equipment
2. Computer cards
3. Schadow switches
4. Mic connectors
5. RTS & Dual plug patch bays
6. Biomedical Electronics
7. Computing & Peripherals
8. Cable TV
9. Robotics
10. Environmental Impact
11. Recording studios
12. Broadcast equipment
13. Mobile Radio
14. Educational computing
15. Stereo systems
16. Aid to IC insertion
17. Navigational equipment
18. Card edge conn. problems
19. Complex process control
20. Automotive service
21. Gold plating/solder alloy
22. Very high humidity
23. High current thermal runaway
24. Car stereo systems
25. Plastic element pots.
26. Farm machinery & trucks
27. Model & hobby
28. RF case seals
29. Outdoor environments
30. Computer crashes
31. Relays & switches
32. Silicone problems
33. Tin-plated contacts
34. Solder flux & resin residue
35. Post application color tinting
36. Aircraft connectors w/ flurosilicones
37. Avoiding unsafe solvents
38. S22 R&D Design Goals
39. Stabilant use on PLCC's
40. Sensor problem solution
41. Repair of flood damage
42. Marine electrical & electronics
43. All Cameras & Video Equipment
44. SCSI removable SCA drives, caddies & connections
45. Home Theater & Computer Connectors

Some of these application notes are repetitive of material in other application notes. We realize this. But some were written as a reference to a contact problem in a particular field or application.

NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither R.A.L. Audio Services, D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
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Stabilant 22
REVIEWS
Over the years, Stabilant 22 has been highly parsed in publications that target a wide range of electronics applications including:
* Andrew Marshall's Audio Ideas Guide
* BYTE Magazine (7 articles)
* Windows Magazine
* Q.S.T. Amateur Radio
* Model Railroads (2 articles)
* Motor Magazine
Stabilant 22
TECHNICAL NOTES
1. MSDS - Stabilant 22
2. General Information
4. MSDS - Stabilant 22A
5. MSDS - Stabilant 22E
9. MSDS - Stabilant 22L
20. Military Applications
21. Elastomer Compatibility
22. Effectiveness of Stabilants
24. Connector Harmonic Distortion
39. Signal rise time

There are gaps in the sequence numbers below because some Technical Note s were written by the manufacturer for specific companies and are confidential.

NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither R.A.L. Audio Services, D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
Stabilant
Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.

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