Standard Products
UT63M143 MIL-STD-1553A/B Bus +3.3V
Transceiver
Datasheet
June 20, 2008
www.aeroflex.com/RadHard
FEATURES
3.3-volt only operation
Dual-cavity monolithic silicon technology
Fit and functionally compatible to industry standard
transceiver
Idle low transmitter inputs and receiver outputs
Military operating temperature range: -55°C to +125°C
Radiation performance
- Total-dose tolerance: 300 krads and 1Mrad(Si)
- SEL Immune to a LET of 111 MeV-cm
2
/mg
Packaging options:
- 24-lead flatpack, dual-channel 50-mil center
- 36-pin DIP, dual-channel 100-mil center
Standard Microcircuit Drawing (SMD): 5962-07242
- QML Q and QML V compliant part
INTRODUCTION
The monolithic UT63M143 Transceivers are complete
transmitter and receiver pairs for +3-volt MIL-STD-1553A and
1553B applications. Encoder and decoder interfaces are idle
low.
The receiver section of the UT63M143 series accepts biphase-
modulated Manchester II bipolar data from a MIL-STD-1553
data bus and produces TTL-level signal data at its RXOUT and
RXOUT outputs. An external RXEN input enables the receiver
outputs or disables them low.
The transmitter section accepts biphase TTL-level signal data
at its TXIN and TXIN and produces MIL-STD-1553 data
signals. The transmitter’s output voltage is typically 7.5 V
PP,LL
.
Activating the TXIHB input or setting both data inputs to the
same logic level disables the transmitter outputs.
The UT63M143 series offers complete transmitter and receiver
pairs packaged in a dual-channel 36-pin DIP or 24-lead flatpack
configurations designed for use in any MIL-STD-1553
application.
RXEN
RXOUT
RXIN
RXIN
FILTER
and
LIMITER
THRESHOLD
REFERENCE
TXOUT
DRIVERS
TXOUT
COMPARE
TXIN
FROM ENCODER
FILTER
TO DECODER
RXOUT
TXIN
TXIHB
Figure 1. Functional Block Diagram
1
Legend for TYPE field:
TI
TO
DO
DI
DIO
()
[]
=
=
=
=
=
=
=
TTL input
TTL output
Differential output
Differential input
Differential input/output
Channel designator
24-lead flatpack
TRANSMITTER
NAME
TXOUT
1
(A)
TXOUT
(B)
TXOUT
1
(A)
TXOUT
(B)
TXIHB
(A)
TXIHB
(B)
TXIN
(A)
TXIN
(B)
TXIN
(A)
TXIN
(B)
PIN
NUMBER
1 [1]
10 [7]
2 [2]
11 [8]
34 [22]
25 [16]
35 [23]
26 [17]
36 [24]
27 [18]
TYPE
DO
[DIO]
DO
[DIO]
DO
[DIO]
DO
[DIO]
TI
TI
TI
TI
TI
TI
TXIN is the complement of TXIN input.
Transmitter input: TXIN and TXIN are complementary TTL-
level Manchester II encoder inputs.
Transmitter inhibit: This is an active high input signal. High
input disables transmitter outputs.
TXOUT is the half-cycle complement of TXOUT.
DESCRIPTION
Transmitter outputs: TXOUT and TXOUT are differential data
signals.
Note:
1. The 24-lead flatpack internally connects TXOUT to RXIN (CHA, CHB) and TXOUT to RXIN (CHA, CHB) for each channel.
2
RECEIVER
NAME
RXOUT
(A)
RXOUT
(B)
RXOUT
(A)
RXOUT
(B)
RXEN
(A)
RXEN
(B)
RXIN
1
(A)
RXIN
(B)
RXIN
1
(A)
RXIN
(B)
PIN
NUMBER
5 [4]
14 [10]
8 [6]
17 [12]
6 [5]
15 [11]
29 [1]
20 [7]
30 [2]
21 [8]
TYPE
TO
TO
TO
TO
TI
TI
DI
[DIO]
DI
[DIO]
DI
[DIO]
DI
[DIO]
RXIN is the half-cycle complement of RXIN input.
Receiver input: RXIN and RXIN are biphase-modulated
Manchester II bipolar inputs from MIL-STD-1553 data bus.
Receiver enable/disable: This is an active high input signal. Low
input forces RXOUT and RXOUT low.
RXOUT is the complement of RXOUT output.
DESCRIPTION
Receiver outputs: RXOUT and RXOUT are complementary
Manchester II decoder outputs.
Note:
1. The 24-lead flatpack internally connects TXOUT to RXIN (CHA, CHB) and TXOUT to RXIN (CHA, CHB) for each channel.
POWER AND GROUND (Note 1)
NAME
V
DD
(A)
V
DD
(B)
GND
(A)
GND
(B)
PIN
NUMBER
33 [20]
24 [14]
3, 7, 31
[3,19,21]
12, 16, 22
[9,13,15]
TYPE
PWR
PWR
GND
GND
DESCRIPTION
+3.3 V
DC
power (±0.15V)
Recommended decoupling capacitors:
1μF (tantalum) and 0.1μF (ceramic)
Ground reference
Note:
1. Recommended decoupling it to place one
1μF
Tantalum and one
0.1μF
ceramic, capacitor as close as possible to each V
DD
power pin.
3
TXOUT
TXOUT
GND
NC
RXOUT
RXEN
GND
RXOUT
NC
TXOUT
TXOUT
GND
NC
RXOUT
RXEN
GND
RXOUT
NC
1
2
3
4
5
6
7
8
9
10
11
12
CHANNEL A
36
35
34
33
32
31
30
29
28
27
26
25
TXIN
TXIN
TXIHB
V
DD
NC
GND
RXIN
RXIN
NC
TXIN
TXIN
TXIHB
V
DD
NC
GND
RXIN
RXIN
NC
13
CHANNEL B
24
23
14
15
16
17
18
22
21
20
19
Figure 2a. Functional Pin Diagram -- Dual Channel (36)
CHA
CHA
GND
RXOUT
RXEN
RXOUT
1
2
3
4
5
6
7
8
9
10
11
12
CHANNEL B
CHANNEL A
24
23
22
21
20
19
18
17
16
15
14
13
TXIN
TXIN
TXIHB
GND
V
DD
GND
CHB
CHB
GND
RXOUT
RXEN
RXOUT
TXIN
TXIN
TXIHB
GND
V
DD
GND
Figure 2b. Functional Pin Diagram -- Dual Channel (24)
1
Note:
1. The 24-lead flatpack internally connects TXOUT to RXIN (CHA, CHB) and TXOUT to RXIN (CHA, CHB) for each channel.
4
TRANSMITTER
The transmitter section accepts TTL-level, biphase Manchester
II encoded data and converts this data into differential phase-
modulated current drive. The transmitter current drivers are
coupled to a MIL-STD-1553 data bus via a transformer driven
from the TXOUT and TXOUT terminals. The 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. Reference Table 1, Transmit Operating Mode, for a list of
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 TTL-level, biphase Manchester
II 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.
Table 1. Transmit Operating Mode
TXIN
x
1
0
0
1
1
TXIN
x
0
1
0
1
TXIHB
1
x
0
0
x
TXOUT
OFF
2
OFF
3
ON
ON
OFF
3
TXIN
TXIN
BOTH HIGH
OR
BOTH LOW
TXIHB
LINE-TO-LINE
DIFFERENTIAL
OUTPUT
TXOUT, TXOUT
90%
10%
TXIN
TXIN
t
TXDD
Figure 3. Typical Transmitter Wave
LINE-TO-LINE
DIFFERENTIAL
INPUT
RXOUT
RXOUT
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.
RXOUT
RXOUT
t
RXDD
Figure 4. Typical Receiver Waveforms
5
Microchip MCU
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