eroflex Circuit T
echnology
Data Bus Modules For The Future SCDCT2512 REV C 8/14/01
Features
CT2512 Replaces DDC BUS-65112 and BUS-65117
CT2513 Replaces DDC BUS-65113 and BUS-65118
CT2510 Replaces DDC BUS-65110 and BUS-65120
CT2511 Replaces DDC BUS-65111 and BUS-65121
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
Approved DESC SMD# 596287535
General Description
The CT2512 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 CT2512 is a pin-for-pin functional equivalent of the DDC BUS-65112/117 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 -55C to + 125C. Aeroflex is a MIL-PRF-38534 Certified
Manufacturer. See "Ordering Information" (last sheet) for CT2513 / CT2510 / CT2511.
Figure 1 Functional Block Diagram
DB0-DB15
A0-A11
ERROR FLAG
TIMING FLAGS
STATUS BITS
I/O
INTERFACE
MIL-STD-1553B
PROTOCOL
AND
BIT
PROCESSING
LOGIC
ENCODER/
DECODER
ENCODER/
DECODER
DUAL
TRANSCEIVER
DATA BUS A
DATA BUS B
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
CT2512 / CT2513 / CT2510 / CT2511
Dual Redundant Remote Terminal
FOR MIL-STD-1553B
F
I
E
I
D
C
E
R
T
A
E
R
O
F
L E
X L A
B
S
I
N
C
.
ISO
9001
Aeroflex Circuit Technology
SCDCT2512 REV C 8/14/01 Plainview NY (516) 694-6700
2
Absolute Maximum Ratings
Parameter
Limits
Units
Power Supply Voltage (V
CC
)
(Pins 18, 76)
-0.3 to +18.0
Volts
Power Supply Voltage (V
EE
)
(Pins 38, 57)
+0.3 to -18.0
Volts
Power Supply Voltage (V
CCL
)
(Pins 37, 58 / 51)
-0.3 to +7.0
Volts
Receiver Differential Input
(Pins 20, 59 / 74, 36)
20 (40Vp-p)
Volts
Receiver Input Voltage
(Pins 20, 59 / 74, 36)
15
Volts
Driver Output Current
(Pins 56, 17 / 39, 77)
+200
mA
Transmission Duty Cycle at T
C
= 125C
100
%
Operating Case Temperature Range (T
C
)
-55 to +125
C
Power and Thermal Data (Transceiver and Logic Section)
Parameter/Conditions
Symbol
Min
Typ
Max
Units
Power Supply Voltage
V
CC
V
EE
V
CCL
14.25
-14.25
4.5
15
-15
5
15.75
-15.75
5.5
V
V
V
Power Dissipation of most critical (hottest) device in
hybrid during continuous transmission (100% Duty
Cycle)
P
C
Note 1
350
mW
Thermal Resistance, most critical device
JC
60
C/W
Junction to case temperaturer rise of most critical
device at 100% duty cycle
T
JC
60
80
C
Total supply current standby mode, or transmitting at
less than 1% duty cycle (e.g. 20us of transmission
every 2ms or longer interval)
I
CC
I
EE
I
CC1
Note 2
Note 2
30
50
90
44
70
130
mA
mA
mA
Total supply curren transmitting at 1Mhz into a 35-ohm
load at point A in Figure 2
ICC @ 25%
ICC @ 100%
Note 3
Note 3
70
200
100
260
mA
mA
Note 1: Decreases linearly to zero at zero duty cycle.
Note 2: I
EE
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
SCDCT2512 REV C 8/14/01 Plainview NY (516) 694-6700
3
Electrical Characteristics (Receiver Section)
Parameter/Conditions
Symbol
Min
Typ
Max
Units
Differential input impedance
DC to 1MHz
Z
IN
9K
V
Differential voltage range
V
DIR
20V
Vpeak
Input common mode voltage
range
V
ICR
10V
Vpeak
Common mode rejection ratio
(from point A, Figure 1)
CMMR
40
dB
Threshold characteristics
(Sine wave at 1MHz)
Note: Threshold voltages refer to point A, Figure 2.
V
th
0.8
1.1
Vp-p
Electrical Characteristics (Transmitter Section)
Parameter/Conditions
Symbol
Min
Typ
Max
Units
Differential output level at point B, Figure 1 (145 ohm load)
V
O
26
28
35
Vp-p
Rise and Fall times (10% to 90% of p-p output)
T
r
100
160
300
nS
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
V
OS
20
90
mV Vpeak
Differential output noise
V
NOI
10
mV pp
Aeroflex Circuit Technology
SCDCT2512 REV C 8/14/01 Plainview NY (516) 694-6700
4
Logic Characteristics
Symbol
Parameter
Min
Typ
Max
Units
Conditions
V
IH
Input "1"
2.4
VDC
V
IL
Input "0"
0.7
VDC
I
IL
Input l
-100
-650
A
Note 1A
I
IH
Input l
-650
A
Note 1B
I
IL
Input l
-20
+20
A
Note 2A
I
IH
Input l
-20
+20
A
Note 1B
V
OH
Output "1"
2.7
VDC
Note 3A/4A
V
OL
Output "0"
0.4
VDC
Note 3B/4B
Note 1:
For INPUT pins 12,13,14,15, 53, 54, 55.
VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V
Note 2:
All remaining INPUTS other than in Note 1.
VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V
Note 3:
For OUTPUT pins 4 through 11 and 43 through 50.
A. @ VCC = 4.5V and IOH = 3mA
B. @ VCC = 2.4V and IOL = 6mA
Note 4:
All remaining OUTPUTS other than in Note 3.
A. @ VCC = 4.5V and IOH = 2mA
B. @ VCC = 5.5V and IOL = 4mA
Aeroflex Circuit Technology
SCDCT2512 REV C 8/14/01 Plainview NY (516) 694-6700
5
Taps at N1:N3 For
Stub Coupling
(See Table)
CT
}
Figure 2 Typical Direct Coupled Configuration
B
A
For
Direct
Coupling
55
55
(N1 : N2)
(See Table)
Turns Ratio
CT2512
N1:N2
1.4:1
N1:N3
2:1
Technitrol Part #
T-1553-2
CT2512
CH A/B
CH A/B
GND
TX DATA
TX DATA
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