5
TRANSMITTER
The transmitter section accepts Manchester II biphase TTL data
and converts this data into differential phase-modulated current
drive. Transmitter current drivers are coupled to a MIL-STD-
1553 data bus via a transformer driven from the TXOUT and
TXOUT terminals. Transmitter output terminals’ non-
transmitting state is enabled by asserting TXIHB (logic 1), or
by placing both TXIN and TXIN at the same logic level. Table
1, Transmit Operating Mode, lists the functions for the output
data in reference to the state of TXIHB. Figure 3 shows typical
transmitter waveforms.
RECEIVER
The receiver section accepts biphase differential data from a
MIL-STD-1553 data bus at its RXIN and RXIN inputs. The
receiver converts input data to biphase Manchester II TTL
format and is available for decoding at the RXOUT and RXOUT
terminals. The outputs RXOUT and RXOUT represent positive
and negative excursions (respectively) of the inputs RXIN and
RXIN. Figure 4 shows typical receiver output waveforms.
Models UT63M105, UT63M107, UT63M125, and UT63M127
idle in the “0” state when disabled or receiving no signal.
POWER SUPPLY VOLTAGES
The UT63M1XX series meets device requirements over a wide
range of power supply voltages. Table 2 shows the overall
capabilities of all available devices. Each channel of the dual
transceiver is electrically and physically separate from the other
and fully independent, including all power and signal lines. Thus
there will be no interaction between the channels.
Notes:
1. x = Don’t care.
2. Transmitter output terminals are in the non-transmitting mode during Off
time.
3. Transmitter output terminals are in the non-transmitting mode during Off
time, independent of TXIHB status.
Table 1. Transmit Operating Mode
TXIN
TXIN
TXIHB
TXOUT
x
1
x
1
Off
2
0
0
x
Off
3
0
1
0
On
1
0
0
On
1
1
x
Off
3
TXIN
Figure 3. Typical Transmitter Waveforms
TXIN
tTXDD
90%
10%
TXOUT, TXOUT
TXIN
LINE-TO-LINE
DIFFERENTIAL
OUTPUT
TXIN
TXIHB
BOTH HIGH
OR
BOTH LOW
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