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Model T940 User Manual
Publication No. 980938 Rev. K
UR14 Driver/Receiver Board I-6
Astronics Test Systems
UR14
AUX[5:8] B
AUX RH[5:8]B
50
Ω
-2V
Vbb
MC100ELT25
MC100ELT24
74LVT125
Rt = 50
Ω
2:1 MUX
NC
FRONT
PANEL
DSB
AUX EN[5:8]B
AUX DATA[5:8]B
I/O CONTROL
CONTROL
LOGIC
Figure I-4: Auxiliary AUX[5:8] B LVTTL | SE ECL I/O
For these Auxiliary signals, an I/O pin assignment of either ECL or LVTTL
requires no Sequencer assignment changes.
Signal Descriptions (Figure I-4)
AUX RH[5:8]B
Auxiliary Response Inputs to the Data Sequencer from the
LVTTL or ECL input buffers.
AUX EN[5:8]B
Auxiliary Enable outputs from the Data Sequencer to the
LVTTL output buffers.
AUX DATA[5:8]B Auxiliary Data outputs from the Data Sequencer to the ECL
and LVTTL output buffers.
I/O CONTROL
Control Logic signals to control isolation, termination and
configuration relays
AUX[5:8] B
Auxiliary I/O 5B through 8B programmable selection
between SE ECL or LVTTL I/O
Vbb
ECL Switching threshold typically –1.29 V