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Figure 2 - i/o equivalent circuit – CTI Products IIB Console Interface User Manual

Page 8

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IIB Hardware Reference

Specifications

CTI Products, Inc.

68-10844-115

3

Figure 2 shows the equivalent circuits of the IIB 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

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