Data Translation DT9835, User Manual

Page: 56 / 80

Appendix A
46
Table 5 lists the specifications for the digital input subsystem.
Table 5: DIN Subsystem Specifications
Feature Specifications
Number of lines 64 shared digital I/O lines and 32 dedicated
digital input lines
a
a. The DT9835 board can generate a PCI-bus interrupt when any of the digital input
lines corresponding to banks 10 and 11 changes state.
Termination 100 k
Ω
Pullup to +5V_I
b
b. You can drive the +5V_I isolated output pin from an external power supply. This
will allow the last digital output value to be latched to the input stage; therefore, if
the power is reduced by the host, the digital output values will not change. Current
requirements are 50 mA plus load.
Inputs
Input type:
Input load:
High-level input voltage:
Low-level input voltage:
High-level input current:
Low-level input current:
Level sensitive
1 (HCT)
2.0 V minimum
0.8 V maximum
100 k
Ω
Pullup to +5V_I
b
−
100
µ
A
Back EMF diodes Yes