Standard Products
UT63M14x MIL-STD-1553A/B Bus Transceiver
Data Sheet
Sept. 1999
FEATURES |
INTRODUCTION |
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q 5-volt only operation (+10%) |
The monolithic UT63M14x Transceivers are complete |
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q Completely monolithic bipolar technology |
transmitter and receiver pairs for MIL-STD-1553A and 1553B |
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applications. Encoder and decoder interfaces are idle low. |
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q Fit and functionally compatible to industry standard |
The receiver section of the UT63M14x series accepts biphase- |
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transceiver |
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modulated Manchester II bipolar data from a MIL-STD-1553 |
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q Idle low transmitter inputs and receiver outputs |
data bus and produces TTL-level signal data at its RXOUT and |
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q Dual-channel 50-mil center 24-lead Flatpack |
RXOUT |
outputs. An external RXEN input enables or disables |
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the receiver outputs. |
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qDual-channel 100-mil center 36-pin DIP
qFull military operating temperature range, -55°C to +125°C, screened to QML Q or QML V requirements
qRadiation hardened to 1.0E6 rads(Si)
qSupports MIL-STD-1760 (UT63M145) and MIL-STD-1553 |
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RXEN |
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(UT63M147) |
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q Standard Microcircuit Drawing (SMD) 5962-93226 |
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available |
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RXOUT |
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RXIN |
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F ILTER |
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F ILTER |
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TO DECODER |
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RXIN |
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LIMITER |
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THRESHOLD |
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RXOUT |
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DRIVERS |
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REFERENCE |
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TXOUT |
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TXIN |
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COMPARE |
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FROM ENCODER |
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TXOUT |
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TXIN |
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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 VPP, L-L. Activating the TXIHB input or setting both data inputs to the same logic level disables the transmitter outputs.
Legend for TYPE field:
TI |
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TTL input |
TO |
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TTL output |
DO |
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Differential output |
DI |
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Differential input |
DIO |
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Differential input/output |
( ) |
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Channel designator |
[ ] |
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24-lead flatpack |
TRANSMITTER
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.
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NAME |
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PIN |
TYPE |
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DESCRIPTION |
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NUMBER |
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TXOUT 1 |
1 |
[1] |
DO |
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Transmitter outputs: TXOUT and |
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are differential data |
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TXOUT |
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(A) |
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[DIO] |
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signals. |
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TXOUT |
10 [7] |
DO |
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(B) |
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[DIO] |
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1 |
2 |
[2] |
DO |
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is the half-cycle complement of TXOUT. |
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TXOUT |
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TXOUT |
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[DIO] |
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(A) |
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11 [8] |
DO |
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TXOUT |
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(B) |
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[DIO] |
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TXIHB |
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34 |
[22] |
TI |
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Transmitter inhibit: This is an active high input signal. |
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(A) |
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TXIHB |
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25 |
[16] |
TI |
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(B) |
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TXIN |
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35 |
[23] |
TI |
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Transmitter input: TXIN and |
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are complementary TTL- |
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TXIN |
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(A) |
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level Manchester II encoder inputs. |
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TXIN |
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26 |
[17] |
TI |
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(B) |
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36 |
[24] |
TI |
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is the complement of TXIN input. |
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TXIN |
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TXIN |
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(A) |
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27 |
[18] |
TI |
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TXIN |
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(B) |
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Note:
1. The 24-lead flatpack internally connects TXOUT to RXIN (CHA, CHB) and TXOUT to RXIN (CHA, CHB) for each channel.
2
RECEIVER
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TYPE |
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DESCRIPTION |
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NUMBER |
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RXOUT |
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5 |
[4] |
TO |
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Receiver outputs: RXOUT and |
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are complementary |
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RXOUT |
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(A) |
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Manchester II decoder outputs. |
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RXOUT |
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14 |
[10] |
TO |
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(B) |
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8 |
[6] |
TO |
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is the complement of RXOUT output. |
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RXOUT |
RXOUT |
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(A) |
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17 |
[12] |
TO |
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RXOUT |
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(B) |
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RXEN |
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6 |
[5] |
TI |
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Receiver enable/disable: This is an active high input signal. |
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(A) |
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RXEN |
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15 |
[11] |
TI |
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(B) |
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RXIN 1 |
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29 [1] |
DI |
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Receiver input: RXIN and |
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are biphase-modulated |
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RXIN |
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(A) |
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[DIO] |
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Manchester II bipolar inputs from MIL-STD-1553 data bus. |
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RXIN |
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20 [7] |
DI |
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(B) |
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[DIO] |
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1 |
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30 [2] |
DI |
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is the half-cycle complement of RXIN input. |
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RXIN |
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RXIN |
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[DIO] |
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(A) |
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21 [8] |
DI |
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RXIN |
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(B) |
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[DIO] |
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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 |
PIN |
TYPE |
DESCRIPTION |
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NUMBER |
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VCC |
33 [20] |
PWR |
+5 VDC power (±10%) |
(A) |
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VCC |
24 [14] |
PWR |
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(B) |
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GND |
3, 7, 31 |
GND |
Ground reference |
(A) |
[3,19,21] |
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GND |
12, 16, 22 |
GND |
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(B) |
[9,13,15] |
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1 |
36 |
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TXIN |
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TXOUT |
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2 |
35 |
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TXIN |
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TXOUT |
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3 |
34 |
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TXIHB |
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GND |
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NC |
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4 |
CHANNEL A 33 |
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VCC |
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5 |
32 |
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NC |
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RXOUT |
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6 |
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31 |
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RXEN |
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GND |
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7 |
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GND |
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RXIN |
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8 |
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RXIN |
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RXOUT |
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TXOUT |
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TXIN |
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TXOUT |
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TXIHB |
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13 CHANNEL B 24 |
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RXOUT |
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Figure 2a. Functional Pin Diagram -- Dual Channel (36)
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1 |
24 |
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CHA |
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CHA |
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GND |
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CHANNEL A |
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TXIHB |
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RXOUT |
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RXEN |
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GND |
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RXOUT |
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CHB |
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TXIN |
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CHB |
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GND |
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TXIHB |
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CHANNEL B |
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RXOUT |
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RXEN |
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12 |
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RXOUT |
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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’ nontransmitting 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 |
TXIN |
TXIHB |
TXOUT |
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x1 |
x |
1 |
Off2 |
0 |
0 |
x |
Off3 |
0 |
1 |
0 |
On |
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1 |
0 |
0 |
On |
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1 |
1 |
x |
Off3 |
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.
TXIN
BOTH HIGH OR
BOTH LOW
TXIN
TXIHB
LINE-TO-LINE
DIFFERENTIAL 90%
OUTPUT
TXOUT, TXOUT |
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10% |
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TXIN
TXIN
tTXDD
Figure 3. Typical Transmitter
Wave
LINE-TO-LINE
DIFFERENTIAL
INPUT
RXOUT
RXOUT
RXOUT
RXOUT
tRXDD
Figure 4. Typical Receiver Waveforms
5
DATA BUS INTERFACE 1
The designer can connect the UT63M14x 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 feet. Figure 5 shows various examples of bus coupling configurations. The UT63M14x series transceivers are designed to function with MIL-STD-1553A and 1553B compatible transformers.
Note:
1. The 24-lead flatpack internally connects TXOUT to RXIN and TXOUT to RXIN for each channel.
RECOMMENDED THERMAL PROTECTION
All packages 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 thermallyconductive 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.
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SHORT-STUB |
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1:2.5 |
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DIRECT COUPLING |
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ZO |
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55 OHMS |
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1 FT. MAX. |
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+5V DC OPERATION |
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55 OHMS |
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TXOUT |
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1:1.79 |
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20 FT MAX |
1:1.4 |
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.75 ZO |
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RXIN |
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.75 ZO |
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TXOUT |
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LONG-STUB |
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RXIN |
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TRANSFORMER COUPLING |
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Figure 8. Transceiver Test Circuit MIL-STD-1553B
Note:
ZO defined per MIL-STD-1553B, Section 4.5.1.5.2.1.
ZO
Figure 5. Bus Coupling Configuration
6