National Instruments DAQ PCI-4451, User Manual

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Chapter 4 Signal Connections
© National Instruments Corporation 4-11 PCI-4451/4452/4453/4454 User Manual
Table 4-6. Digital I/O Signal Summary
Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA at
V)
Rise
Time
(ns) Bias
DGND DIO — — — — — —
+5 V DIO 0.15
Ω
Short-circuit
to ground 1A — — —
DIO<0..7> DIO — V
cc
+0.5 13 at
(V
cc
−
0.4)
24 at 0.4 1.1 50 k
Ω
pu
RESERVED1 DO — — — — — 50 k
Ω
pu
EXTSTROBE* DO — — 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI0/TRIG1
(EXT_TRIG) DIO — V
cc
+0.5 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI1/TRIG2 (PRETRIG) DIO — V
cc
+0.5 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
CONVERT* DO — — 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI3/GPCTR1_SOURCE DIO — V
cc
+0.5 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI4/GPCTR1_GATE DIO — V
cc
+0.5 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
GPCTR1_OUT DO — — 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
UPDATE* DO — — 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI6/WFTRIG DIO — V
cc
+0.5 3.5 at
(V
cc
-0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI7 DI — V
cc
+0.5 — — — 50 k
Ω
pu
PFI8/GPCTR0_SOURCE DIO — V
cc
+0.5 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
PFI9/GPCTR0_GATE DIO — V
cc
+0.5 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
GPCTR0_OUT DO — — 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
FREQ_OUT DO — — 3.5 at
(V
cc
−
0.4)
5 at 0.4 1.5 50 k
Ω
pu
DI = Digital Input DIO = Digital Input/Output DO = Digital Output pu = pullup
Note: The tolerance on the 50 k
Ω
pullup and pulldown resistors is very large. Actual value may range from 17 to 100 k
Ω
.