Standard Products
UT63M14x MIL-STD-1553A/B Bus
Transceiver
Data Sheet
March 2005
FEATURES
5-volt only operation (+10%)
Completely monolithic bipolar technology
Fit and functionally compatible to industry standard
transceiver
Idle low transmitter inputs and receiver outputs
Dual-channel 50-mil center 24-lead Flatpack
Dual-channel 100-mil center 36-pin DIP
Full military operating temperature range, -55°C to +125°C,
screened to QML Q or QML V requirements
Radiation hardened to 1.0E6 rads(Si)
Supports MIL-STD-1553 (UT63M147)
Standard Microcircuit Drawing (SMD) 5962-93226 available
INTRODUCTION
The monolithic UT63M14x Transceivers are complete
transmitter and receiver pairs for MIL-STD-1553A and 1553B
applications. Encoder and decoder interfaces are idle low.
The receiver section of the UT63M14x 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 or disables
the receiver outputs.
RXEN
RXOUT
RXIN
RXIN
F ILTER
and
LIMITER
THRESHOLD
REFERENCE
DRIVERS
TXOUT
COMPARE
TXOUT
TXIN
F ILTER
TO DECODER
RXOUT
TXIN
TXIHB
Figure 1. Functional Block Diagram
1
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
12 V
PP, L-L
. Activating the TXIHB input or setting both data
inputs to the same logic level disables the transmitter outputs.
The UT63M14x 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.
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]
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.
TXOUT is the half-cycle complement of TXOUT.
DESCRIPTION
Transmitter outputs: TXOUT and TXOUT are differential data
signals.
11 [8]
34 [22]
25 [16]
35 [23]
26 [17]
36 [24]
27 [18]
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]
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.
RXOUT is the complement of RXOUT output.
DESCRIPTION
Receiver outputs: RXOUT and RXOUT are complementary
Manchester II decoder outputs.
21 [8]
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
NAME
V
CC
(A)
V
CC
(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
Ground reference
DESCRIPTION
+5 V
DC
power (±10%)
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
TXIN
TXIN
TXIHB
V
CC
NC
GND
RXIN
RXIN
NC
27
26
25
TXIN
TXIN
TXIHB
V
CC
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
CHANNEL A
24
23
22
21
20
19
18
17
CHANNEL B
16
15
14
13
TXIN
TXIN
TXIHB
GND
V
CC
GND
CHB
CHB
GND
RXOUT
RXEN
RXOUT
7
8
9
10
11
12
TXIN
TXIN
TXIHB
GND
V
CC
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 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.
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
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
RXOUT
RXOUT
t
RXDD
Note:
Figure 4. Typical Receiver Waveforms
5
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