2
Rev A
NOTICE TO USER
The information contained in this manual is believed to be correct. However, MicroBee Systems
assumes no responsibility for any of the circuits described herein, conveys no license under any
patent or other right, and makes no representations that the circuits are free from patent
infringement. MicroBee Systems makes no representation or warranty that such applications will
be suitable for the use specified without further testing or modification.
MicroBee Systems Corporation general policy does not support the use of its products in life
support applications where the failure or malfunction of a component may directly threaten life or
injury. It is a Condition of Sale that the user of MicroBee Systems products in life support
applications assumes the risk of such use and indemnifies MicroBee Systems against all
damage.
Please read before installing your product.
MicroBee’s products are designed to be high in performance while consuming very little power. In
order to maintain this advantage, CMOS circuitry is used. CMOS chips have specific needs and
some special requirements that the user must be aware of. Read the following to help avoid
damage to your card from the use of CMOS chips.
Using CMOS Circuitry
Industrial Control originally used LSTTL circuits. Because many PC components are used in
laptop computers, IC manufacturers are exclusively using CMOS technology. Both TTL and
CMOS have failure mechanisms, but they are different. This section describes some of the
common failures which are common to all manufacturers of CMOS equipment.
Improper power causes catastrophic failure.
If a card has had reverse polarity or high voltage applied, replacing a failed component is not an
adequate fix. Other components probably have been partially damaged or a failure mechanism
has been induced. Therefore, a failure will probably occur in the future. For such cards, MicroBee
highly recommends that these cards be replaced.
Other over-voltage symptoms
In over-voltage situations, the programmable logic devices, EPROM’s and CPU chips, usually fail
in this order. The failed device may be hot to the touch. It is usually the case that only one IC will
be overheated at a time.
Hot insertion
Hot insertion is not supported. Doing so voids your warranty.
(18 paginas)
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