Figure 2 - i/o equivalent circuit – CTI Products IOB I/O Interface User Manual
Page 8
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IOB Hardware Reference
Specifications
CTI Products, Inc.
68-11168-105
3
Figure 2 shows the equivalent circuits of the IOB I/O pins. The pull-up voltage
Vp by jumper E1B, located on the rear of the module.
• Vp = 13.8 Vdc with jumper E1B out
• Vp = 5.0 Vdc with jumper E1B in
CA-80043-100
0.1uF
22K
Vp
150K
HCMOS
IC
INPUT
PROTECTION
ESD
30V
TRANSORB
0.1uF
22K
Vp
PROTECTION
ESD
30V
TRANSORB
180K
+5V
0.1uF
22K
Vp
150K
HCMOS
IC
INPUT
PROTECTION
ESD
30V
TRANSORB
+5V
+5V
INPUT/OUTPUT
OUTPUT
INPUT
Figure 2 - I/O Equivalent Circuit
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