Measurement Computing BTH-1208LS - Manual (Page 24)

BTH-1208LS User's Guide Specifications
24
Input low voltage threshold 0.98 V typ
0.6 V min
1.5 V max
Input low voltage limit –0.5 V absolute min
0 V recommended min
External clock input
Table 13. External clock input specifications
Parameter Specification
Terminal name AICKI
Terminal type Input
Input clock rate 50 kHz, max
Clock pulse width 1 µs min
Input type Schmitt trigger, 47
kΩ pull-down to ground
Schmitt trigger hysteresis 0.76 V typ
0.4 V min
1.2 V max
Input high voltage threshold 1.74 V typ
1.3 V min
2.2 V max
Input high voltage limit 5.5 V absolute max
Input low voltage threshold 0.98 V typ
0.6 V min
1.5 V max
Input low voltage limit –0.5 V absolute min
0 V recommended min
Counter
Table 14. Counter specifications
Parameter Specification
Pin name CTR
Counter type Event counter
Number of channels 1
Input type
Schmitt trigger, 47 kΩ pull-down to ground, rising edge triggered
Input source CTR screw terminal
Resolution 32 bits
Maximum input frequency 1 MHz
High pulse width 500 ns min
Low pulse width 500 ns min
Schmitt trigger hysteresis 0.76 V typ
0.4 V min
1.2 V max
Input high voltage threshold 1.74 V typ
1.3 V min
2.2 V max
Input high voltage limit 5.5 V absolute max
Input low voltage threshold 0.98 V typ
0.6 V min
1.5 V max