Appendix A
Specifications
SCXI-1141/1142/1143 User Manual
A-4
ni.com
Digital Input/Output
EXTCLK pin input voltage
with respect to DIGGND ........................5.5 V max
–0.5 V min
Absolute maximum voltage input rating
with respect to DIGGND ........................–0.5 to 5.5 V
Digital input referenced to DIGGND
VIH, input logic high voltage ..........2 V min
VIL, input logic low voltage ...........0.8 V max
Digital output referenced to DIGGND
VOH, output logic high voltage ......3.7 V min at 4 mA
VOL, output logic low voltage........0.4 V max at 4 mA
Physical
Dimensions .............................................1.2 by 6.8 by 8.0 in.
(3.0 by 17.3 by 24.4 cm)
I/O connectors
Rear connector.................................50-pin male ribbon-cable
Front connector................................96-pin DIN C male
(screw-terminal adapters available)
Maximum Working Voltage
Maximum working voltage refers to the signal voltage plus the
common-mode voltage.
Channel-to-earth
.....................................±
5 V, Installation Category I
Channel-to-channel
.................................±
10 V, Installation Category I