Measurement Computing USB-205 - Manual (Page 18)

USB-205 User's Guide Specifications
18
Counter
Table 8. CTR specifications
Parameter Specification
Pin name CTR
Number of channels 1 channel
Resolution 32-bit
Counter type Event counter
Input type Schmitt trigger, 47 kΩ pull-down to ground
Counter read/write rates
(software paced) 33 to 4,000 reads/writes per second typ, system dependent
Schmitt trigger hysteresis 1.01 V typ
0.6 V min
1.5 V max
Input high voltage threshold 2.43 V typ
1.9 V min
3.1 V max
Input low voltage threshold 1.42 V typ
1.0 V min
2.0 V max
Input voltage limits 5.5 V absolute max
–0.5 V absolute min
0 V recommended min
Input frequency 1 MHz max
High pulse width 25 ns min
Low pulse width 25 ns min
Memory
Table 9. Memory specifications
Parameter Specification
Data FIFO 12 K (12,288) analog input samples
Non-volatile memory 2 KB (768 B calibration storage, 256 B UL user data, 1 KB DAQFlex user data)
Power
Table 10. Power specifications
Parameter Condition Specification
Supply current Typical (Note 3) 150 mA
Maximum (including user voltage, DIO and
AICKO loading) 500 mA
User voltage output
terminal (+VO) 4.25 V min, 5.25 V max
User voltage output current 100 mA max
Note 3: This is the total quiescent current requirement for the device which includes up to 10 mA for the Status
LED. This value does not include any potential loading of the digital I/O bits, AICKO, or user voltage.