Counters; Timer; Memory - Measurement Computing USB-1208HS-2AO User Manual

USB-1208HS-2AO User's Guide

Counters

Parameter
Counter terminal names
Counter type
Number of channels
Input type
Schmitt trigger hysteresis
Input high voltage
Input low voltage
Resolution
Maximum input frequency
Counter read/write rates
(software paced)
High pulse width
Low pulse width

Timer

Parameter
Timer terminal name
Timer type
Output value
Internal clock frequency
Register widths
High pulse width
Low pulse width
Output high voltage
Output low voltage
Output current

Memory

Parameter
Data FIFO
Non-volatile memory
Table 9. Counter specifications
Specification
CTR0, CTR1
Event counter
2
Schmitt trigger, 33 Ω series resistor, 47 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
32 bits
20 MHz
33 to 8000 reads/writes per second typ, system dependent
25 ns min
25 ns min
Table 10. Timer specifications
Specification
TMR
PWM output with count, period, delay, and pulse width registers
Default state is idle low with pulses high, software-selectable output invert
40 MHz
32 bits
20 ns min
20 ns min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
±24 mA max per pin (refer to
Table 11. Memory specifications
Specification
4 kS analog input/4 kS analog output
32 KB (16 KB firmware storage, 16 KB calibration/user data)
Power section for additional information)
20
Specifications