Digital I/O Specifications - Data Translation DT9850 Series User Manual

Appendix A

Digital I/O Specifications

Table 27
Digital logic type
Number of lines
Digital I/O transfer rate
Power on and reset state
Pull-up/pull-down
configuration
Digital input loading
Inputs
Outputs
a. For pull-up, connect the Digital I/O Termination Select pin to the +5 V Out pin. For
90
lists the digital input and digital output specifications for the DT9850 Series modules.
Table 27: Digital Input and Digital Output Specifications
Feature
Input type:
Input load:
High-level input voltage:
Low-level input voltage:
Interrupt-on-change:
Output driver:
Output driver high voltage:
Output driver low voltage:
pull-down, connect the Digital I/O Termination select pin to the Digital Ground pin.
Specifications
CMOS
8 digital inputs (port B);
8 digital outputs (port A)
Up to 1 kHz (system dependent)
Digital input
User-configurable on inputs
By default, all input pins floating
TTL (default)
47 kΩ (pull-up/pull-down configuration)
Level sensitive
Schmitt trigger
3.5 V minimum
1.5 V maximum
Digital input lines 0 to 6
Push-pull logic
4.3 V minimum (IOH = –2 mA);
0.6 V maximum (IOL = 10 mA)
a
;