Figure 2-8. Frequency Measurement Application - National Instruments PC-TIO-10 User Manual

Chapter 2
Signal
Source
I/O Connector
Two or more counters can be concatenated by connecting the OUT signal from one counter to
the SOURCE signal of another counter. The counters can then be treated as one 32-bit or larger
counter for most counting applications. It is possible to create up to a 160-bit counter in this
manner.
The GATE, SOURCE, OUT, and FOUT signals on the I/O connector are connected directly to
the Am9513A input and output pins. The input and output ratings and timing specifications for
the Am9513A signals are given as follows.
The following specifications and ratings apply to the Am9513A I/O signals.
Absolute maximum voltage rating
Am9513A Digital Input Specifications (referenced to GND):
Input logic high voltage
Input logic low voltage
Input current (0 < V in < 5.25 V)
© National Instruments Corporation
Gate
Source
33

Figure 2-8. Frequency Measurement Application

-0.5 to +7.0 V with respect to GND
Minimum
-10 µA
SOURCE
GATE
GND
PC-TIO-10 Board
Maximum
2.0 V
0.0 V
2-11
Configuration and Installation
Counter
OUT
5.25 V
0.8 V
10 µA
PC-TIO-10 User Manual