BU-63147 and BU-63149
MIL-STD-1553 DATA BUS
+5V TRANSCEIVER
DESCRIPTION
The BU-63147/49 transceiver is a com-
plete dual transmitter and receiver pair
conforming fully to MIL-STD-1553A
and 1553B. Features include: mono-
lithic design, +5V power supply voltage,
Harris or Smiths type decoder inter-
face, completely independent dual
redundant operation, and small size
(36 pin DIP). The receiver section of
the BU-63147/49 series accepts
phase-modulated bipolar data from a
MIL-STD-1553 Data Bus and pro-
duces TTL Signal data at its output.
RX DATA OUT and
RX DATA OUT
These outputs represent positive and
negative variations of the input data
signals beyond an internally fixed
threshold level. An external STROBE
input enables or disables the receiver’s
outputs.
The transmitter section accepts
bi-phase TTL signal data at its
TX DATA IN and
TX DATA IN
inputs
and produces phase-modulated
bipolar data at the TX DATA OUT and
TX DATA OUT
outputs.
The
transmitter’s output voltage level is
typically about 11Vpp. An external
input, INHIBIT, takes priority over the
transmitter inputs and disables the
transmitter when activated with a logic
“1”.
The small size, +5V power supply volt-
age,
and
compliance
with
MIL-STD-1553 simplify engineering
design, making it an excellent choice
for interfacing with any MIL-STD-1553
system.
FEATURES
•
•
•
•
•
•
•
•
+5V Power Supply
Low Power
Conforms Fully To MIL-STD-1553A
AND 1553B
Dual Transceiver
Available with MIL-STD-1760
Compliant Transmitter Voltage
Available with McAir Compatible
Waveform
36-Pin DIP
HARRIS or SMITHS I/O
Compatibility
+5 V
1553
DATA
BUS
RECEIVER STROBE
BI PHASE
TTL DATA
COMPARATOR
RX DATA OUT
RX DATA OUT
DECODER
PHASE MODULATED
BIPOLAR DATA
RX DATA IN
SHORT OR
LONG STUB
COUPLING
ISOLATION
TRANSFORMER
RX DATA IN
RECEIVER SECTION
FILTER
FILTER
COMPARATOR
TRANSMITTER SECTION
TX Data Out
SHAPING
NETWORK
TX DATA IN
TX Data Out
SHAPING
NETWORK
ENCODER
TX DATA IN
CASE/GND
TX INHIBIT
FIGURE 1. BU-63147/49 BLOCK DIAGRAM
(one
channel shown)
©
2000
Data Device Corporation
TABLE 1. BU-63147/49 SPECIFICATIONS
PARAMETER
ABSOLUTE MAXIMUM RATING
Supply Voltage
!
+5 V (Vcc)
Receiver
!
Input Voltage
Logic
!
Voltage Input Range
RECEIVER
Differential Input Resistance
(Notes 1-6)
Differential Input Capacitance
(Notes 1-6)
Threshold Level (Note 7)
Common Mode Voltage (Note 8)
TRANSMITTER
Differential Output Voltage
!
Direct Coupled Across 35
Ω,
Measured on Bus
!
Transformer Coupled Across
70
Ω,
Measured on Stub:
• BU-63147XX-XX0
• BU-63147X3-XX2 (Note 9)
Output Noise, Differential (Direct
Coupled)
Output Offset Voltage, Transformer
Coupled Across 70 ohms
Rise/Fall Time
• BU-63147X3
• BU-63147X4
LOGIC
VIH
VIL
IIH
Tx Data In, Tx Inhibit Rx Strobe
IIL
Tx Data In, Tx Inhibit Rx Strobe
VOH (Vcc=4.75V,IOH=max)
VOL (Vcc=4.75V, IOL=max)
IOL
IOH
POWER SUPPLY REQUIREMENTS
Voltages/Tolerances
!
+5V
Current Drain (Total Hybrid)
BU-63147/9XX-XX0
• Idle (Both Channels)
• 25% Transmitter Duty Cycle
(One Channel)
• 50% Transmitter Duty Cycle
(One Channel)
• 100% Transmitter Duty Cycle
(One Channel)
BU-63147/9X3-XX2
• Idle (Both Channels)
• 25% Transmitter Duty Cycle
(One Channel)
• 50% Transmitter Duty Cycle
(One Channel)
• 100% Transmitter Duty Cycle
(One Channel)
20
-100
2.4
0.4
3.4
-3.4
MIN
TYP
MAX
UNITS
-0.3
5.0
7.0
20
V
Vp-p
differential
-0.3
2.5
Vcc+10%
V
kohm
5
0.20
0.860
10
pF
Vp-p
Vpeak
6
7
9
Vp-p
18
20
20
22
27
27
10
250
-250
150
Vp-p
Vp-p
mVp-p,
diff
mVp-p,
diff
ns
ns
V
100
200
2.0
150
250
300
300
0.8
100
-20
V
µA
µA
V
V
mA
mA
TABLE 1. BU-63147/49 SPECIFICATIONS
PARAMETER
MIN TYP
MAX
POWER DISSIPATION
(Note 10)
Total Hybrid
BU-63147/9XX-XX0
• Idle (Both Channels)
0.55
• 25% Transmitter Duty Cycle
0.78
(One Channel)
• 50% Transmitter Duty Cycle
1.00
(One Channel)
• 100% Transmitter Duty Cycle
1.44
(One Channel)
BU-63147/9X3-XX2
• Idle (Both Channels)
0.55
• 25% Transmitter Duty Cycle
0.84
(One Channel)
• 50% Transmitter Duty Cycle
1.13
(One Channel)
• 100% Transmitter Duty Cycle
1.70
(One Channel)
Hottest Die
BU-63147/9XX-XX0
• Idle (Both Channels)
0.28
• 25% Transmitter Duty Cycle
0.51
(One Channel)
• 50% Transmitter Duty Cycle
0.75
(One Channel)
• 100% Transmitter Duty Cycle
1.22
(One Channel)
BU-63147/9X3-XX2
• Idle (Both Channels)
0.28
• 25% Transmitter Duty Cycle
0.58
(One Channel)
• 50% Transmitter Duty Cycle
0.88
(One Channel)
1.48
• 100% Transmitter Duty Cycle
(One Channel)
THERMAL
• Thermal Resistance, Junction-to-
25
Case, Hottest Die (θJC)
-55
150
• Operating Junction Temperature
-65
150
• Storage Temperature
+300
• Lead Temperature
(soldering, 10 sec.)
PHYSICAL CHARACTERISTICS
Size
36-Pin DIP
1.895 x 0.775 x 0.210
(48.1 x 19.7 x 5.3)
36-Lead Flatpack
1.905 x 0.785 x 0.165
(48.4 x 19.9 x 4.2)
Weight
0.6
(17)
Notes:
UNITS
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
°C/W
°C
°C
°C
4.75
5.0
5.5
V
in.
(mm)
in.
(mm)
oz
(g)
100
205
310
520
mA
mA
mA
mA
Notes 1 through 6 are applicable to the Receiver Differential Resistance and
Differential Capacitance specifications:
100
216
332
565
mA
mA
mA
mA
(1) Specifications include both transmitter and receiver (assumed tied together
externally).
(2) Impedance parameters are specified directly between pins TX/RX A(B) and
TX/RX A(B) hybrid.
(3) It is assumed that all power and ground inputs to the hybrid are connected and
that the hybrid case is connected to ground for the impedance measurement.
2
Notes (continued)
(4) The specifications are applicable for both unpowered and powered conditions.
(5) The specifications assume a 2 volt rms balanced, differential, sinusoidal input.
The applicable frequency range is 75 kHz to 1 MHz.
(6) Minimum resistance and maximum capacitance parameters are guaranteed
over the operating range, but are not tested.
(7) The Threshold Level, as referred to in this specification, is meant to be the
maximum peak-to-peak voltage (measured on the data bus) that can be
applied to the receiver's input without causing the output to change from the
OFF state.
(8) Assumes a common mode voltage within the frequency range of dc to 2 MHz,
applied to pins of the isolation transformer on the stub side (either direct or
transformer coupled), and referenced to transceiver ground. Transformer must
be a DDC recommended transformer or other transformer that provides an
equivalent minimum CMRR.
(9) MIL-STD-1760 requires minimum output voltage of 20 Vp-p on the stub con-
nection. The -XX2 option is
not
available for the BU-63147X4 version.
(10) Power dissipation specifications assume a transformer coupled configura-
tion, with external dissipation (while transmitting) of 0.14 watts for the active
isolation transformer, 0.08 watts for the active coupling transformer, 0.45 watts
for each of the two bus isolation resistors, and 0.15 watts for each of the two
bus termination resistors.
TABLE 2. TRANSMIT OPERATING MODE
TX Data In
X
0
0
1
1
TX Data In
X
0
1
0
1
TX INHIBUIT
H
X
L
L
X
DRIVER OUTPUT
OFF (NOTE)
OFF
TX DATA OUT ON,
TX DATA OUT OFF
TX DATA OUT ON,
TX DATA OUT OFF
OFF
NOTE:
DRIVER OUTPUT terminals are in the high impedance mode
during OFF time, independent of INHIBIT status.
RECEIVER OPERATING MODE
The receiver section accepts data from a MIL-STD-1553 Data
Bus when coupled to the Data Bus as shown in FIGURE 3. This
data is converted to bi-phase TTL and furnished to
RX DATA OUT and
RX DATA OUT
.
When STROBE is high data passes throught the receiver to
RX DATA OUT and
RX DATA OUT
. Applying a low to STROBE
disables the receiver output terminals.
As illustrated in FIGURE 2, the receiver in the BU-65147 pro-
vides compatibility to the Harris decoder, while the BU-63149
provides compatibility to the Smiths decoder.
INTRODUCTION
The BU-63147/49 is a dual redundant transmitter and receiver
packaged in a 36-pin DDIP. It is directly compatible to Harris
15530 encoder/decoder and has internal (factory preset) thresh-
old levels. The dual transceiver only requires +5V power and
conforms to MIL-STD-1553A and 1553B. For McAir compatabili-
ty, versions are available with rise/fall times of 200 to 300 nsec.
FIGURE 3 illustrates the connection between a BU-63147/49
transceiver and a MIL-STD-1553 Data Bus. After transformer
isolating the transceiver, it can be either direct coupled (short
stub) or transformer coupled (long stub) to the Data Bus.
WAVEFORMS
FIGURE 2 illustrates the BU-63147 with Harris type decoder
interface and the BU-63149 with Smiths type decoder interface.
Note that DATA and
DATA
inputs must be complementary wave-
forms with a 50% duty cycle.
ENCODER
OUTPUT
(NOTE 2)
TX Data In
TX Data In
LINE-TO-LINE
OUTPUT
LINE-TO-LINE
INPUT
XXX
XXX
X X X
X X X
TRANSMIT OPERATING MODE
The transmitter section accepts encoded TTL data and converts
it to phase-modulated bipolar form using a waveshaping network
and driver circuits. The driver outputs TX DATA OUT and
TX DATA OUT
are transformer coupled to the Data Bus.
The transmitter output terminals can be put into a high imped-
ance state by setting INHIBIT high, or setting TX DATA IN and
TX DATA IN
to the same logic level. The operating modes are
shown in TABLE 2.
The transceivers are able to operate in a “wraparound” mode.
This allows output data to be monitored by the receiver section
and returned to the decoder where it is checked for errors.
RX Data Out
BU-63147
RX Data Out
RX Data Out
BU-63149
RX Data Out
Notes:
(1) TX Data In and RX Data Out are TTL signals.
(2) TX Data In inputs must be at opposite logic levels during transmission, and at
the same logic level when not transmitting.
(3) LINE-TO-LINE output voltage is measured between TX Data Out and TX Data Out.
(4) LINE-TO-LINE input voltage is measured on the Data Bus.
FIGURE 2. WAVEFORMS FOR HARRIS/SMITHS
TYPE ENCODER/DECODERS
3
(1:2.5)
TX
BU-63147/49
TX
RX
RX
11.2 VPP
1
2
3
4
8
SHORT STUB
(DIRECT COUPLED)
1 FT MAX
55Ω
Z0(70 to 85Ω)
55Ω
28 VPP
OR
LONG STUB
(TRANSFORMER
COUPLED)
(1:1.4)
(1:1.79)
TX
1
2
3
5 20 FT MAX 8
7
20 V PP
4
1
3
0.75
Z0
0.75
Z0
BU-63147/49
TX
RX
RX
Z0(70 to 85Ω)
Notes:
One half of dual transceivers shown.
FIGURE 3. INTERFACE TO 1553 BUS
PULSE TRANSFORMERS
Interfacing the BU-63147/49 to a MIL-STD-1553 bus requires a
pair of pulse transformers. Beta Transformer Technology
Corporation (BTTC), a subsidiary of DDC, manufactures trans-
NOTES:
1.
formers in a variety of mechanical configurations with the
required turns ratios of 1:2.5 direct coupled, or 1:1.79 trans-
former coupled. Table 3 provides a listing of many of these. For
further information, contact BTTC at 631-244-7393 or at
www.bttc-beta.com.
For the BU-63147/49X4-XX0 versions, which include McAIR compatible transceivers,
only
the B-3818 or B-3819 transformers
(shown in
bold
in the table) may be used.
For the BU-63147/49X3-XXX versions with 1553B (and possibly 1760) transceivers,
any
of the other transformers listed may be used.
There are
no
BU-63147/49X4-XX2 versions.
2.
3.
4
TABLE 3. RECOMMENDED BTTC TRANSFORMERS FOR USE WITH BU-63147/49 TRANSCEIVERS
TRANSFORMER CONFIGURATION
Single epoxy transformer, through-hole, 0.625 X 0.625, 0.250" max height
Single epoxy transformer, through-hole, 0.625 X 0.625, 0.220" max height.
(May be used with BU-63147/49X4-XX0 version.)
Single epoxy transformer, flat pack, 0.625" X 0.625", 0.275" max height
Single epoxy transformer, surface mount, 0.625" X 0.625", 0.275" max height
Single epoxy transformer, surface mount, hi-temp solder, 0.625" X 0.625", 0.220" max height.
(May be used with BU-63147/49X4-XX0 version.)
Single epoxy transformer, flat pack, 0.625" X 0.625", 0.150" max height
Single epoxy transformer, surface mount, 0.625" X 0.625", 0.150" max height
Dual epoxy transformer, twin stacked, 0.625" X 0.625", 0.280" max height
Dual epoxy transformer, twin stacked, surface mount, 0.625" X 0.625", 0.280" max height
Dual epoxy transformer, twin stacked, flat pack, 0.625" X 0.625", 0.280" max height
Dual epoxy transformer, side by side, through-hole, 0.930" X 0.630", 0.155 max height
Dual epoxy transformer, side by side, flat pack, 0.930" X 0.630", 0.155 max height
Dual epoxy transformer, side by side, surface mount, 0.930" X 0.630", 0.155 max height
Single metal transformer, hermetically sealed, flat pack, 0.630" X 0.630", 0.175" max height
Single metal transformer, hermetically sealed, surface mount, 0.630" X 0.630", 0.175" max height
BTTC PART NO.
B-3226
B-3818
B-3231
B-3227
B-3819
LPB-5014
LPB-5015
TST-9007
TST-9017
TST-9027
B-3300
B-3261
B-3310
HLP-6014
HLP-6015
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TABLE 4. BU-63147/49 PIN LISTING
FUNCTION
PIN
TX Data Out A
TX Data Out A
GND A
NC
RX Data Out A
RX Strobe A
GND A
RX Data Out A
GND (case)
TX Data Out B
TX Data Out B
GND B
NC
RX Data Out B
RX Strobe B
GND B
RX Data Out B
NC
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
NC
RX Data In B
RX Data In B
GND B
NC
+5 VDC B
TX Inhibit B
TX Data In B
TX Data In B
NC
RX Data In A
RX Data In A
GND A
NC
+5 VDC A
TX Inhibit A
TX Data In A
TX Data In A
FUNCTION
5
