National Instruments AT-MIO-16X

Chapter 2 Configuration and Installation

AT-MIO-16X User Manual 2-40

National Instruments Corporation

The signals for Counters 1, 2, and 5, and the FOUT outpu t signal ar e

directly tied from the Am9513A input and output pins to the I/O

connector. In addition, the GATE, SOURCE, and OUT1 pins are pulled

up to +5 V through a 4.7-kΩ resistor. The input and output ratings and

timing specifications for the Am9513A signals are given as follows:

Absolute maximum voltage input rating –0.5 V to +7.0 V with

respect to DIG GND

Am9513A digital input specifications (referenced to DIG GND):

VIH input logic high voltage 2.2 V minimum

VIL input logic low voltage 0.8 V maximum

Input load current ±10 µA maximum

Am9513A digital output specifications (referenced to DIG GND):

VOH output logic high voltage 2.4 V minimum

VOL output logic low voltage 0.4 V maximum

IOH output source current, at VOH 200 µA maximum

IOL output sink current, at VOL 3.2 mA maximum

Output current, high-impedance state ±25 µA maximum

Figure 2-19 shows the timing requirements for the GATE and SOURCE

input signals and the timing specifications for the OUT output signals

of the Am9513A.