ADLINK PXI-2022 - Manual (Page 13)

Introduction 5
Digital I/O
General Purpose Timer/Counter (GPTC)
Digital I/O Specifications
Model Name PXI-2020/2022
Number of Channel 4 input/output
Compatibility
Input 3.3 V or 5 V TTL
Output 3.3 V TTL
Input Logic Levels
Input low voltage: 0.8 V (max)
Input high voltage: 2.0 V(min)
Output Logic Levels
Output low voltage: 0.4 V (max)
Output high voltage: 2.8 V (min)
Output Driving Capacity ±24 mA
Power-on State Input, pull-low with 10KΩ resistor
Data Transfer Polling mode
Table 1-3: Digital I/O
General Purpose Specifications
Model Name PXI-2020/2022
Number of Channels 2 up/down counter/timers (by AFI)
Resolution 32-bit
Compatibility
Input 3.3 V or 5V TTL
Output 3.3 V TTL
Base clock available 20 MHz
Data Transfer Polling mode
Table 1-4: General Purpose Timer/Counter