Measurement Computing USB-1208HS-4AO - Manual (Page 20)

USB-1208HS-4AO User's Guide Specifications
20
Counters
Table 9. Counter specifications
Parameter Specification
Counter terminal names CTR0, CTR1
Counter type Event counter
Number of channels 2
Input type Schmitt trigger, 33
Ω series resistor, 47 kΩ pull-down to ground
Schmitt trigger hysteresis 0.4 V to 1.2 V
Input high voltage 2.2 V min
5.5 V absolute max
Input low voltage 1.5 V max
–0.5 V absolute min
0 V recommended min
Resolution 32 bits
Maximum input frequency 20 MHz
Counter read/write rates
(software paced) 33 to 8000 reads/writes per second typ, system dependent
High pulse width 25 ns min
Low pulse width 25 ns min
Timer
Table 10. Timer specifications
Parameter Specification
Timer terminal name TMR
Timer type PWM output with count, period, delay, and pulse width registers
Output value Default state is idle low with pulses high, software-selectable output invert
Internal clock frequency 40 MHz
Register widths 32 bits
High pulse width 20 ns min
Low pulse width 20 ns min
Output high voltage 4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
Output low voltage 0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
Output current ±24 mA max per pin (refer to Power section for additional information)
Memory
Table 11. Memory specifications
Parameter Specification
Data FIFO 4 kS analog input/4 kS analog output
Non-volatile memory 32 KB (16 KB firmware storage, 16 KB calibration/user data)