National Instruments PCI-6509, Руководство пользователя

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PCI/PXI/PCIe-6509 User Guide and Specifications
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© National Instruments
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23
Output Signals
The total current sinking/sourcing from one port cannot exceed 100 mA.
Without the disk drive power connector installed, the +5 V supply and the DIO lines share the
same power source. In this case, use the following equation to determine the current available at
the +5 V terminal. In the equation, I
DIO
is the total current sourced on all DIO lines.
I
+5V
= 1.2 A

I
DIO
With the disk drive power connector installed, the current at the +5 V terminal is supplied by an
external power source. In this case, the current at the +5 V terminal can be up to 1 A.
Negative-going threshold (VT

) 0.8 V —
Delta VT hysteresis (VT+

VT

) 0.2 V —
Input high current (I
IH
)
(V
in
= 5 V, resistors set to pull-up)
— 260

A
Input high current (I
IH
)
(V
in
= 5 V, resistors set to pull-down)
— 260

A
Input low current (I
IL
)
(V
in
= 0 V, resistors set to pull-up)
— –1250

A
Input low current (I
IL
)
(V
in
= 0 V, resistors set to pull-down)
—

20

A
Level Minimum Maximum
High-level output current (I
OH
) — –24 mA
Low-level output current (I
OL
) — 24 mA
Output voltage (V
out
) 0 V 5.5 V
Output high voltage (V
OH
), at –24 mA 3.4 V —
Output low voltage (V
OL
), at 24 mA — 0.78 V
Level Minimum Maximum