National Instruments NI 6509 Digital Logic Levels Input Signals, Output Signals (Vcc = 5 V)

NI 6509 User Guide and Specifications 20 ni.com
Power-on state........................................Inputs high-Z (default),
user-selectable input,
output 1 or 0
Data transfers..........................................Interrupts, programmed I/O
I/O connector..........................................100-pin female 0.050 series SCSI
Digital Logic Levels
Input Signals
The maximum input logic high and output logic high voltages assume a
Vcc supply voltage of 5.0 V. Given a Vcc supply voltage of 5.0 V, the
absolute maximum voltage rating for each I/O line is –0.5 V to 5.5 V with
respect to GND.
Output Signals (Vcc = 5 V)
The total current sinking/sourcing from one port cannot exceed 100 mA.
+5V power available at
I/O connector (pins 49 and 99)...............+4.65 to +5.25 V
Note The I/O connector power has a fuse for overcurrent protection. This fuse is not
customer replaceable. If the fuse is blown, return the device to NI for repair.
Programmable power-up states
response time..........................................400 ms
Level Min Max
Input voltage (VI)0 V Vcc
Input logic low voltage (VIL) — 0.8 V
Input logic high voltage (VIH)2 V —
Level Min Max
High-level output current (IOH) — –24 mA
Low-level output current (IOL) — 24 mA
Output voltage (VO) 0 Vcc
Output low voltage (VOL), at 24 mA —0.55 V
Output high voltage (VOH), at –24 mA 3.7 V —