GE VMIVME2120

This board may be ordered with positive or negative true I/O

options. The data conversion (inversion) is determined by the

selection of data latches which control the output driver

transistors.

A positive true output option causes a VMEbus logical one to

turn the corresponding output transistor ON, which supplies the

user with zero volts.

The negative true output option causes a VMEbus logical one to

turn the corresponding output transistor OFF, which supplies the

user with an open circuit for open-collector output circuits or

with a high for electronic switch type output circuits.

Boards manufactured with the negative true TTL option are

designed such that a VMEbus logical one causes the output

driver to produce a logic one (high) to the user.

Conversely, the positive true TTL option is designed such that a

VMEbus logical one causes the output driver to produce a logic

zero (low) to the user. 

Output Features: The high current driver (600mA sink) outputs

are designed to drive incandescent lamps and inductive loads

without external current limiting or warming resistors. Due to

cold filament inrush currents, it is recommended that only one

lamp be driven by the output driver. However, if more than one

bulb must be driven by a single wire, then another driver must

be connected in parallel. If more than one bulb must be driven

by a single output, it is recommended the VMIVME-2131 (current

source/sink) or the VMIVME-2130 (current source only) be used if

the application will allow. The output drivers of the

VMIVME-2131 and VMIVME-2130 will not necessarily support all

of the VMIVME-2120 current sink (open collector) applications. In

addition to this, the VMIVME-2120 and VMIVME-213x have

dissimilar power requirements. 

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