CT 2542 / CT2543
Dual Redundant Remote Terminal
FOR MIL-STD-1553B
Features
• CT2542 Replaces DDC BUS-65142 and BUS-65144
• CT2543 Replaces DDC BUS-65143 and BUS-65145
• Functions as a Complete Remote Terminal Unit
• Supports 13 Mode Codes, Illegalization of Codes Allowed
• Transfers Data with DMA Type Handshaking
• Latched Outputs for Command Word and Word Count
• 14 Bit Built-ln-Test Word Register
• 4 Error Flag Outputs
• Advanced Low Power VLSI Technology
• DESC SMD# 5962–89798 Approved
CIRCUIT TECHNOLOGY
www.aeroflex.com
A E
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ISO
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RT
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.
General Description
The CT2542 contains 2 transceivers, 2 encoder/decoders, bit processors and complete Remote Terminal (RT)
logic. The device is constructed using Aeroflex advanced VLSI custom chip and hybrid technology. It
functions as a complete dual redundant MIL-STD-1553B RT Unit supporting all 13 mode codes for dual
redundant operation. The CT2542 is a pin-for-pin functional equivalent of the DDC BUS-65142/144 and
performs parallel data transfers with a DMA type handshake. Multiple error flag outputs and host access to
many of the RT Status Word bits are just some of the features that make this part ideal for many RT
applications. The unit has an operating range of -55°C to + 125°C. Aeroflex is a MIL-PRF-38534 Certified
Manufacturer.
See "Ordering Information" (last sheet) for CT2543.
DATA BUS A
DUAL
TRANSCEIVER
DATA BUS B
ENCODER/
DECODER
MIL-STD-1553B
PROTOCOL
AND
BIT
I/O
INTERFACE
DB0-DB15
A0-A11
ERROR FLAG
TIMING FLAGS
STATUS BITS
ENCODER/
DECODER
PROCESSING
LOGIC
Figure 1 – Functional Block Diagram
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCDCT2542 REV E 8/23/00
Absolute Maximum Ratings
Parameter
Power Supply Voltage (V
EE
)
Limits
+0.3 to -18.0
Units
Volts
Power Supply Voltage (V
CCL
)
-0.3 to +7.0
Volts
Receiver Differential Input
±20 (40Vp-p)
Volts
Receiver Input Voltage
±15
Volts
Driver Output Current
+200
mA
Transmission Duty Cycle at T
C
= 125°C
100
%
Operating Case Temperature Range (T
C
)
-55 to +125
°C
Power and Thermal Data (Transceiver and Logic Section)
Parameter/Conditions
Power Supply Voltage
V
EE
V
CCL
Power Dissipation of most critical (hottest) device in
hybrid during continuous transmission (100% Duty
Cycle)
Thermal Resistance, most critical device
Junction to case temperature rise of most critical device
at 100% duty cycle
Total supply current standby mode, or transmitting at
less than 1% duty cycle (e.g. 20µs of transmission
every 2ms or longer interval)
Total supply curren transmitting at 1Mhz into a 35-ohm
load at point A in Figure 2
-14.25
4.5
-15
5
-15.75
5.5
V
V
Symbol
Min
Typ
Max
Units
P
C
350
mW
Note 1
Ø
JC
T
JC
I
CCL
I
EE
I
EE
@ 50%
I
EE
@ 100%
60
60
80
50
50
70
175
270
°C/W
°C
mA
mA
Note 2
mA
Note 3
mA
Note 3
Note 1: Decreases linearly to zero at zero duty cycle.
Note 2: I
CCL
limit does not change with mode of operation or duty cycle.
Note 3: Decreases linearly to applicable "standby" values at zero duty cycle.
Aeroflex Circuit Technology
1
SCDCT2542 REV E 8/23/00 Plainview NY (516) 694-6700
Electrical Characteristics (Receiver Section)
Parameter/Conditions
Differential input impedance
DC to 1MHz, Point B, Figure 2
Symbol
Z
IN
V
DIR
V
ICR
Min
2K
Typ
Max
Units
Ω
Differential voltage range
Input common mode voltage
range
Common mode rejection ratio
(from point A, Figure 2)
Threshold characteristics
(Sine wave at 1MHz)
Note: Threshold voltages refer to point A, Figure 2.
±20V
±10V
Vpeak
Vpeak
CMMR
40
dB
V
th
0.6
1.2
Vp-p
Electrical Characteristics (Transmitter Section)
Parameter/Conditions
Differential output level at point B, Figure 2 (145 ohm load)
Symbol
V
O
Min
24
Typ
Max
35
Units
Vp-p
Rise and Fall times (10% to 90% of p-p output)
Output offset at point A in Figure 2 (35-ohm load) 2.5us
after mid-bit crossing of
parity bit of last word of a
660us message
Differential output noise
T
r
100
300
nS
V
OS
±20
±90
mV Vpeak
V
NOI
10
mV pp
Aeroflex Circuit Technology
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SCDCT2542 REV E 8/23/00 Plainview NY (516) 694-6700
Logic Characteristics
Symbol
V
IH
V
IL
I
IL
I
IH
I
IL
I
IH
I
IL
I
IH
V
OH
V
OL
Parameter
Input "1"
Input "0"
Input l
Input l
Input l
Input l
Input l
Input l
Output "1"
Output "0"
Min
2.4
Typ
Max
0.7
Units
VDC
VDC
µA
µA
µA
µA
µA
µA
VDC
Conditions
-80
-40
-20
-20
-20
-40
2.7
-400
-200
+20
+20
-200
-400
Note 1A
Note 1B
Note 2A
Note 1B
Note 5
Note 3A/4A
Note 3B/4B
0.4
VDC
Note 1
For INPUT pins 12,13,14,15, 53, 54, 55.
VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V
All remaining INPUTS other than in Note 1.
VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V
For OUTPUT pins 4 through 11 and 43 through 50.
A. @ VCC = 4.5V and IOH = 2mA
B. @ VCC = 4.5V and IOL = 4mA
All remaining OUTPUTS other than in Note 3.
A. @ VCC = 4.5V and IOH = 1mA
B. @ VCC = 4.5V and IOL = 2mA
For INPUT pins 4-11, 43-50.
VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V
Note 2
Note 3
Note 4
Note 5
Aeroflex Circuit Technology
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SCDCT2542 REV E 8/23/00 Plainview NY (516) 694-6700
Transformer Coupled Stubs
STUB
DATA TX/RX
2:1
ISOLATION
1 : 1.41
55Ω
70Ω
2542
DATA TX/RX
C
A
55Ω
Zoi
V
CMT
= ±10 V
PK
DC to 2MH
Z
Direct Coupled Stubs
STUB
DATA TX/RX
1.4 :1
55Ω
2542
DATA TX/RX
B
A
55Ω
Zoi
35Ω
35Ω
NOTES:
1. Point C, Vo = 18 Vpp Minimum
2. Transformer self Impedance
≥
3KΩ at 1MHz
3. V
CMT
for transformer coupled stubs
V
CMD
for direct coupled stubs
+
±V
CMD
-
Figure 2 – Typical Bus Coupling
Aeroflex Circuit Technology
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SCDCT2542 REV E 8/23/00 Plainview NY (516) 694-6700
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