Chapter 4
Signal Connections
©
National Instruments Corporation
4-7
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
PFI5/UPDATE*
DIO
—
V
cc
+0.5
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/STARTSCAN
DIO
—
V
cc
+0.5
3.5 at (V
cc
-0.4)
5 at 0.4
1.5
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
1
Applies to gain
≤
1, impedance refers to ACH<0..3>–
2
Applies to gain > 1, impedance refers to ACH<0..3>–
AI = Analog Input, DIO = Digital Input/Output, pu = pull-up, AO = Analog Output, DO = Digital Output,
AI/DIO = Analog Input/Digital Input/Output
The tolerance on the 50 k
Ω
pull-up and pull-down resistors is very large. Actual value may range between 17 and 100 k
Ω
.
Table 4-2.
I/O Signal Summary for the 611
X E (Continued)
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
PCI_E.book Page 7 Thursday, June 25, 1998 12:55 PM