6
DATA BUS INTERFACE
The designer can connect the UT63M1XX to the data bus via a
short-stub (direct-coupling) connection or a long-stub
(transformer-coupling) connection. Use a short-stub connection
when the distance from the isolation transformer to the data bus
does not exceed a one-foot maximum. Use a long-stub
connection when the distance from the isolation transformer
exceeds the one-foot maximum and is less than twenty-five feet.
Figure 5 shows various examples of bus coupling
configurations. The UT63M1XX series transceivers are
designed to function with MIL-STD-1553A and 1553B
compatible transformers.
RECOMMENDED THERMAL PROTECTION
All packages, single and dual, should mount to or contact a heat
removal rail located in the printed circuit board. To insure proper
heat transfer between the package and the heat removal rail, use
a thermally conductive material between the package and the
heat removal rail. Use a material such as Mereco XLN-589 or
equivalent to insure heat transfer between the package and heat
removal rail.
Figure 4. Typical Receiver Waveforms
QUIESCENT IDLE LOW
RXOUT
RXOUT
LINE-TO-LINE
DIFFERENTIAL
INPUT
RXOUT
RXOUT
tRXDD
Table 2. Transceiver Model Capabilities
MODEL
VCC
VEE
VCCA
IDLE
UT63M105
+5V
-15V
+5 to +15V
Low
UT63M107
+5V
-12V
+5 to +12V
Low
UT63M125
+5V
-15V
+5 to +15V
Low
UT63M127
+5V
-12V
+5 to +12V
Low
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