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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
UR14 Driver/Receiver Board I-29
UR14 I/O (J1A, J1B, J2A, J2B, J3A, J3B)
Table I-12: UR14 Resources
Name
Description
CH1– CH32
Bi-directional Open Collector Channels
PROBE_IN (AUX1 A)
Probe input channel or bi-directional)general purpose
programmable level auxiliary I/O
PROBE_CAL (AUX2 A)
Probe calibration output channel or bi-directional
general purpose programmable level auxiliary I/O
AUX[1:4] B
Programmable I/O
AUX3 A
Bi-directional general purpose LVTTL
AUX4 A
Probe support signal or bi-directional general purpose
LVTTL
AUX[5|9] A
AUX[6|10] A
AUX[7|11] A
AUX[8|12] A
LVTTL or ECL These channels share a pin on the
connector. They are a programmable selection of one
of three types; LVTTL, SE ECL or Differential ECL (see
the next entry)
AUX[9:12]- A
Negative side of differential ECL AUX[9|12] A used
when these channels are configured as differential ECL
AUX[5:8] B
LVTTL or ECL these channels are a programmable
selection of either LVTTL or SE ECL
AUX[9:11]+ B
AUX[9:11]- B
SE ECL or Differential ECL bi-directional general
purpose I/O
PROBE OUT
Probe Support. External probe module probe
compensation test point. This is a direct connection to
PROBE_IN
PROBE MODE
PBUT
BCLK
PROBE DETECT
Probe Support. These signals provide dedicated support
for the external probe module.
+12V
-12V
Probe Support. These power pins provide low current
power for the external probe module. The maximum
current is limited with an in-line poly fuse.
+VEXT
These power inputs provide a means to expand pull-up
options for the Open Collector channels.
DUT_GND
DUT/UUT ground reference. All of the Pin Electronics
devices have a UUT ground reference input that can be
selected to be this signal or signal ground.
GND_REF
Buffered selected DUT_GND for the Pin Electronics.
GND
Signal Ground reference
Refer to Figure I-14 and Tables I-4 through I-9.