Digital Input/Output - Measurement Computing USB-5200 Series User Manual

USB-5203 User's Guide
Number of Input
Channels
1
2
3
4
5
6
7
8

Digital input/output

Parameter
Digital type
Number of I/O
Configuration
Pull up/pull-down
configuration
Digital I/O transfer rate
(software paced)
Input high voltage
Input low voltage
Output low voltage
(IOL = 2.5 mA)
Output high voltage
(IOH = –2.5 mA)
All ground pins on the device (pins 9, 19, 28, 38) are common and are isolated from earth ground. If a
Note 2:
connection is made to earth ground when using digital I/O and conductive thermocouples, the
thermocouples are no longer isolated. In this case, thermocouples must not be connected to any
conductive surfaces that may be referenced to earth ground.
Table 9. Throughput rate specifications
Maximum Throughput
2 Samples/second
2 S/s on each channel, 4 S/s total
2 S/s on each channel, 6 S/s total
2 S/s on each channel, 8 S/s total
2 S/s on each channel, 10 S/s total
2 S/s on each channel, 12 S/s total
2 S/s on each channel, 14 S/s total
2 S/s on each channel, 16 S/s total
Table 10. Digital input/output specifications
Specification
CMOS
8 (DIO0 through DIO7)
Independently configured for input or output.
Power on reset is input mode unless bit is configured for alarm.
All pins pulled up to +5 V via 47 K resistors (default). Pull down to ground (GND) also
available.
Digital input – 50 port reads or single bit reads per second typ

Digital output – 100 port writes or single bit writes per second typ

2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
0.7 V max
3.8 V min
26
Specifications