Measurement Computing USB-205 - Manual (Page 17)

USB-205 User's Guide Specifications
17
External pacer input/output
Table 7. External pacer I/O specifications
Parameter Specification
Terminal names AICKI, AICKO
Terminal types AICKI: Input, active on rising edge
AICKO: Output, power on default is 0 V, active on rising edge
Terminal descriptions AICKI: Receives pacer clock from external source
AICKO: Outputs internal pacer clock
Input clock rate 500 kHz max
Clock pulse width AICKI: 400 ns min
AICKO: 400 ns min
Input type Schmitt trigger, 47 kΩ pull-down to ground
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
Output high voltage 4.4 V min (IOH = –50 µA)
3.80 V min (IOH = –8 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 8 mA)
Output current ±8 mA max