20 34980A Service Guide
2 Specifications
34945A/34945EXT Module Specifications and Characteristics
34945EXT switch drive (64 channels, low side drive mode)
Driver off voltage (max) 30V
Driver off leakage current 500 A
Driver on current (max) 600 mA
Driver on voltage (max) 0.5 V @ 600 mA
34945EXT switch drive (64 channels, TTL drive mode)
Hi output voltage 3 V @ I
out
= 2 mA
Lo output voltage 0.4 V @ I
in
= 20 mA
Lo input Current 20 mA
34945EXT position indicator sense inputs
Channels 64
Lo input voltage (max) 0.8 V
Hi input voltage (min) 2.5 V
Input resistance > 100 k@ V
in
5 V
> 20 k@ V
in
5 V
Maximum input voltage 30 V
34945EXT switch drive power supply
(34945EXT powered by 34945A)
Voltage 24 V nominal (external power supply
required for switches needing more than 24
V)
Current 100 mA continuous +
200 mA (15 msec pulse, 25% duty cycle)
34945EXT external power connection
Voltage range 4.75 V to 30 V
Current limit 2 A
LED indicators (current mode drivers)
Channels 64
Supply voltage 5 V nominal
LED drive current 5 mA nominal
(programmable 1 to 20 mA)
Compliance voltage 0.8 V
34945EXT Dimensions
11.2 x 4.5 x 1.5 inches high with
distribution boards installed
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