National Instruments PCI-4452 Switch User Manual


 
Chapter 4 Signal Connections
PCI-4451/4452 User Manual 4-8
©
National Instruments Corporation
Table 4-4.
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
Short-circuit
to ground
1A
DIO<0..7>
DIO
Vcc +0.5 13 at
(Vcc
0.4)
24 at 0.4
1.1
50 k pu
RESERVED1
DO
50 k pu
EXTSTROBE*
DO
3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
PFI0/TRIG1 (EXT_TRIG)
DIO
Vcc +0.5 3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
PFI1/TRIG2 (PRETRIG)
DIO
Vcc +0.5 3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
CONVERT*
DO
3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
PFI3/GPCTR1_SOURCE
DIO
Vcc +0.5 3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
PFI4/GPCTR1_GATE
DIO
Vcc +0.5 3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
GPCTR1_OUT
DO
3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
UPDATE*
DO
3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
PFI6/WFTRIG
DIO
Vcc +0.5 3.5 at
(Vcc -0.4)
5 at 0.4
1.5
50 k pu
PFI7
DI
Vcc +0.5
50 k pu
PFI8/GPCTR0_SOURCE
DIO
Vcc +0.5 3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
PFI9/GPCTR0_GATE
DIO
Vcc +0.5 3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
GPCTR0_OUT
DO
3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
FREQ_OUT
DO
3.5 at
(Vcc
0.4)
5 at 0.4
1.5
50 k pu
DIO = Digital Input/Output pu = pullup
DO = Digital Output DI = Digital Input
Note: The tolerance on the 50 k pullup and pulldown resistors is very large. Actual value may range between 17 and 100 k.
User.book Page 8 Tuesday, April 14, 1998 10:20 AM