External Trigger; Pattern Trigger; Memory; Power - Measurement Computing USB-1808X User Manual

USB-1808X User's Guide

External trigger

Parameter
Trigger source
Trigger mode
Trigger latency
Trigger pulse width
Input type
Schmitt trigger hysteresis
Input high voltage
Input low voltage

Pattern trigger

Parameter
Trigger source
Trigger types
Trigger stability
Trigger bit width
Trigger latency

Memory

Parameter
Data FIFO
Non-volatile memory

Power

Parameter
Supply current (Note 3)
+VO user output voltage range
(Note 4)
+VO user output current
Note 3: This is the total quiescent current requirement for the device that includes up to 10 mA for the status LED. This
does not include any potential loading of the digital I/O bits, +VO terminal, or the AOUTx outputs.
Note 4: The +4.5 V min limit includes the +VO 10 mA load, it does not include any potential loading of the digital I/O
bits or the AOUTx outputs.
Table 15. External trigger specifications
Specification
ITRIG for inputs, OTRIG for outputs
Software programmable for edge or level sensitive, rising or falling edge, high or low
level. Power on default is edge sensitive, rising edge.
1 µs + 1 clock cycle max
100 ns min
Schmitt trigger, 33 Ω series resistor and 49.9 kΩ pull-down to ground
0.4 V to 1.2 V
2.2 V min
5.5 V absolute max
1.5 V max
–0.5 V absolute min
0 V recommended min
Table 16. Pattern trigger specifications
Specification
DIO0 – DIO3
Above pattern, Below pattern, Equal pattern, or Not equal pattern
Digital port must be stable for 50 ns to be recognized as a pattern
Up to 4, adjustable through bitmask
Up to 1 scan period
Table 17. Memory specifications
Specification
4 kS analog input/2 kS analog output
32 KB (28 KB firmware storage, 4 KB calibration/user data)
Table 18. Power specifications
Condition
Quiescent current
Available at connector pin 13
Available at connecter pin 13
24
Specification
305 mA
4.5 V min to 5.25 V max
10 mA max
Specifications