Measurement Computing USB-5203 - Manual (Page 26)

USB-5203 User's Guide Specifications
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Table 9. Throughput rate specifications
Number of Input
Channels Maximum Throughput
1 2 Samples/second
2 2 S/s on each channel, 4 S/s total
3 2 S/s on each channel, 6 S/s total
4 2 S/s on each channel, 8 S/s total
5 2 S/s on each channel, 10 S/s total
6 2 S/s on each channel, 12 S/s total
7 2 S/s on each channel, 14 S/s total
8 2 S/s on each channel, 16 S/s total
Digital input/output
Table 10. Digital input/output specifications
Parameter Specification
Digital type CMOS
Number of I/O 8 (DIO0 through DIO7)
Configuration Independently configured for input or output.
Power on reset is input mode unless bit is configured for alarm.
Pull up/pull-down
configuration All pins pulled up to +5 V via 47 K resistors (default). Pull down to ground (GND) also
available.
Digital I/O transfer rate
(software paced)  Digital input – 50 port reads or single bit reads per second typ
 Digital output – 100 port writes or single bit writes per second typ
Input high voltage 2.0 V min, 5.5 V absolute max
Input low voltage 0.8 V max, –0.5 V absolute min
Output low voltage
(IOL = 2.5 mA) 0.7 V max
Output high voltage
(IOH = –2.5 mA) 3.8 V min
Note 2: All ground pins on the device (pins 9, 19, 28, 38) are common and are isolated from earth ground. If a
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.