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NI 5421 Specifications 22 ni.com
DIGITAL DATA & CONTROL (DDC)
Optional Front Panel Connector
Table 7.
Specification Value Comments
Connector
Type
68-pin VHDCI female receptacle —
Number of
Data Output
Signals
16 —
Control
Signals
1. DDC CLK OUT (clock output)
2. DDC CLK IN (clock input)
3. PFI 2 (input)
4. PFI 3 (input)
5. PFI 4 (output)
6. PFI 5 (output)
—
Ground 23 pins —
Output Signal Characteristics (Includes Data Outputs, DDC CLK OUT, and PFI<4..5>)
Signal Type LVDS (Low-Voltage Differential Signal) —
Signal
Characteristics
Minimum Typical Maximum
1. Tested with
100 Ω
differential
load.
2. Measured at
the front panel.
3. Load
capacitance
<10 pF.
4. Driver and
receiver
comply with
ANSI/TIA/
EIA-644.
5. Rise time is
20% to 80%.
V
OH
— 1.3 V 1.7 V
V
OL
0.8 V 1.0 V —
Differential
Output Voltage
0.25 V — 0.45 V
Output
Common-Mode
Vo l t a g e
1.125 V — 1.375 V
Rise/Fall Time — 0.8 ns 1.6 ns