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Chapter 9 Specifications
44474A 16-Bit Digital I/O Module
4
9
44474A 16-Bit Digital I/O Module
I/O LINES
Number of Bits:
16
Maximum Voltage:
Line-Chassis: +30 V dc
Output Characteristics:
Vout (high):
Vout (low):
I (low):
≥ 2.4 V @ I ≤ 8 mA output
≤ 0.4 V @ I ≤ 16 mA input
= 125 mA @ Vout (low) ≤ 1.25 V
fused at 250 mA
Input Characteristics:
Vin (high):
Vin (low):
≥ 2.0 V
≤ 0.8 V
HANDSHAKE LINES
Maximum Voltage:
Line-Chassis: +5 V dc
Output Characteristics:
Vout (high):
Vout (low):
≥ 2.4 V @ I ≤ 400 µA output
≤ 0.5 V @ I ≤ 2 mA input
Input Characteristics:
Vin (high):
Vin (low):
≥ 2.0 V
≤ 0.8 V
External Increment (EI):
a
a. Both EI and CC lines are used for external controlled scanning. The 3499A/B/C will advance to the next channel in
the scan list on the falling edge of EI pulse.
Minimum TTL Pulse Width: 0.25 µs
Channel Closed (CC):
b
b. When the next channel closes, the 44474A outputs a CC pulse to trigger the voltmeter.
Minimum TTL Pulse Width: 10 µs
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