National Instruments SCXI-1163 - page 46

Chapter 3 Theory of Operation
© National Instruments Corporation 3-7 SCXI-1163 User Manual
output channels and the Vcc and ground connections. Table 3-2 shows the channel and port
assignments.
These outputs are open-collector outputs with 4.7 kΩ pullups, which can sink 12 mA while
maintaining an output voltage below 0.6 V. The rise time of the outputs is 1 µsec into a 100 pF
load; you can obtain shorter rise times by adding additional pullup resistors between the output
and Vcc for that port.
VCC
VOUT
TTL Input from
SCXI-1163 
Data Register
4.7 kΩ
GND
Figure 3-5. SCXI-1163 Digital Output Diagram
Note: It is important to notice that this module has no access to the analog backplane; this
protects the backplane from faults when high voltages are available at the module
outputs.
Table 3-2. Channel and Bank Assignments
Bank Channels Front Connector Pins
0 0, 1, 2, 3, Vcc, GND B30, A30, B29, A29, C30, C29
1 4, 5, 6, 7, Vcc, GND B26, A26, B25, A25, C26, C25
2 8, 9, 10, 11, Vcc, GND B22, A22, B21, A21, C22, C21
3 12, 13, 14, 15, Vcc, GND B18, A18, B17, A17, C18, C17
4 16, 17, 18, 19, Vcc, GND A13, B13, A14, B14, C13, C14
5 20, 21, 22, 23, Vcc, GND A9, B9, A10, B10, C9, C10
6 24, 25, 26, 27, Vcc, GND A5, B5, A6, B6, C5, C6
7 28, 29, 30, 31, Vcc, GND A1, B1, A2, B2, C1, C2