eroflex Circuit T
echnology
Data Bus Modules For The Future SCDCT3232 REV A 6/27/02
Features
1.5 Watt Total Hybrid Dissipation at 25% Transmitting Duty Cycle
Monolithic Design
Compatible with MIL-STD-1553A/B & Macair A3818, A5232, A5690 & A4905
Meets MIL-STD-1553B
TTL Compatible
Full Military (-55C to +125C) Temperature Range
Driver / Receiver in a single Package for Space & Weight Savings
Filtering on Receiver to Improve S/N Ratio of System
Pin for Pin interchangeable with CT3231 Series
Packaging Hermetic Metal Plug-In or Flat Package
24 Lead, 1.27" sq. max x .2" Ht Flat package
24 Pin, 1.27" sq. max x .175" Ht Plug-In package
DRIVER DESCRIPTION
The CT3232 Driver section accepts complementary TTL Data at the input, and produces a 30
Volt nominal peak-to-peak differential signal across a 140
load at the output. When coupled to the
Data Bus with a 1:1 transformer, isolated on the Data Bus side with two 55.0
fault isolation
resistors, and loaded by two 70
terminations plus additional receivers, the Data Bus signal
produced is 7.2 Volts nominal peak-to-peak.
When both "DATA" and "DATA" inputs are held low or both are held high, the driver output
becomes a high impedance and is "removed" from the line. In addition, an overriding "INHIBIT"
input provides for removal of the Driver output from the line. A logic "1" applied to the "INHIBIT"
takes priority over the condition of the data inputs and disables the Driver. See Driver Logic
Waveforms, Figure 3.
DATA and DATA inputs must be complementary waveforms, of 50% duty cycle average, with no
gate delays between them.
RECEIVER DESCRIPTION
The CT3232 Receiver section accepts Bi-Phase Differential data at the input and produces two
TTL signals at the output. The outputs are "DATA" and "DATA", and represent positive and negative
excursions (respectively) of the input beyond a predetermined threshold. See Receiver Logic
Waveforms, Figure 2.
The positive and negative thresholds may be internally set by grounding the appropriate pins, or
externally set with resistors. The pre-set internal thresholds will detect Data Bus signals exceeding
1Volt p-p and ignore signals less than 0.5Volt p-p when used with 1:1 transformer (See Figure 4 for
a suitable transformer and typical connection).
A low level at the STROBE input inhibits the DATA and DATA outputs. If unused, a 2K
pull-up to
+5V is recommended.
CT 3232M
For MIL-STD-1553 & Macair
Low Power Driver / Receiver
CIRCUIT TECHNOLOGY
www.aeroflex.com
Aeroflex Circuit Technology
2
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Figure 1 CT3232 Functional Block Diagram and Pinouts
+ REG
(
10V )
LINEAR
AMP
+
FILTER
LEVEL
DET.
+
LEVEL
DET.
+
REG
(
-10V )
LINEAR
AMP
LINEAR
AMP
V +
V+
V
V
+V
CCRX
INT. DATA THRES.
INT. DATA THRES.
RX DATA IN
RX DATA IN
-V
EERX
+V
CCL
TX INHIBIT
TX DATA IN
TX DATA IN
+5V
CASE
GROUND A
- V
EETX
TX DATA OUT
GROUND C
TX DATA OUT
+V
CCTX
GROUND B
EXT. DATA THRES.
RX DATA OUT
STROBE
RX DATA OUT
EXT. DATA THRES.
NOTE: GROUNDS A, B, & C
MUST ALL BE EXTERNALLY
GROUNDED
11
6
13
15
16
19
7
10
12
24
4
9
8
3
17
18
20
21
2
1
23
22
5
Aeroflex Circuit Technology
3
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Absolute Maximum Ratings
Parameter
Range
Units
Supply Voltage, Pin 4 or 13
-0.3 to +18.0
Volts
Supply Voltage, Pin 24 or 19
0.3 to -18.0
Volts
Supply Voltage, Pin 20
-0.3 to + 7.0
Volts
Logic Input Voltage, Pin 8, 21, 22, or 23
-0.3 to +5.5V
Volts
Receiver Differential Input, Pin 15 to Pin 16
20 (40 Vp-p)
Volts
Receiver Input Voltage, Pin 15 or Pin 16
15
Volts
Driver Peak Output Current, Pin 1 or Pin 2
300
mA
Total Package Power Dissipation at (Ambient) T
A
= + 25C
(Derate above T
A
= + 25C at 40 mW/C)
4.0 (Note 1)
Watts
Power Dissipation at Specified Case Temperatures
See Figure 5
Operating Case Temperature Range (T
C
)
(See Figure 5 for limitations)
-55 to +125
C
Electrical Characteristics
Parameter / Condition
Sym
Min
Typ
Max
Unit
Receiver
Power Supply Voltage Ranges
V
CCRX
V
EERX
V
CCL
+11.75
-11.75
+4.75
-
-
-
+15.75
-15.75
+5.25
V
V
V
Supply Current
I
CCRX
I
EERX
I
CCL
-
-
-
25
30
35
-
-
-
mA
mA
mA
Differential Input Impedance
f= 1MHz
Z
IN
9K
-
-
Differential Voltage Range
V
IDR
20
-
-
Vpeak
Input Common Mode Voltage Range
V
ICR
10
-
-
Vpeak
Common Mode Rejection Ratio (From Point A, Fig. 4)
CMRR
40
-
-
dB
Strobe Characteristics (Logic "0" inhibits Output)
"0" Input Current (V strobe = 0.5 V)
"1" Input Current (V strobe = 2.7 V)
"0" Input Voltage
"1" Input Voltage
Strobe Delay (turn-on or turn-off)
I
IL
I
IH
V
IL
V
IH
t
SD
-
-
-
2.0
-
-
-
-
-
20
-4
400
0.7
-
-
mA
A
V
V
ns
Threshold Characteristics (Sinewave input, 100KHz to 1MHz)
Note: Threshold voltages are referred to the Input
Internal (Pin 6 & 11 grounded)
External (Pin 6 & 11 open; threshold setting resistors from Pin 5
to ground & from Pin 12 to ground; R
TH
Max = 10K
)
V
TH
1
R
TH
/V
TH
1
0.6
-
-
4000
1.0
-
Vp-p
/
Vp-p
Filter Characteristics (Pin 6 & 11 Grounded)
(Sinewave input)
f = 2MHz
f= 3MHz
V
TH
2
V
TH
3
1.0
3.0
-
-
3.0
-
Vp-p
Vp-p
Aeroflex Circuit Technology
4
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Receiver con't
Output Characteristics, RX Data & Data
"1" State (I
SOURCE
= -0.4 mA) Note 2
"0" State (I
SINK
= 4 mA) Note 2
Note: With Receiver input below threshold, both RX Data & RX
Data outputs remain in "1" state.
Delay (average) from differential input zero crossings to RX Data
& RX Data output 50% points.
V
OH
V
OL
t
DRX
2.5
-
-
3.3
-
290
-
0.5
450
V
V
ns
Note 1: Assumes unit in free air (natural convection cooling).
Driver
Power Supply Voltage Ranges
(See Receiver Section for V
CCL
)
V
CCTX
V
EETXL
+11.75
-11.75
-
-
+15.75
-15.75
V
V
Supply Current
,
"Standby" mode
(See Receiver Section for I
CCL
)
(TX Inhibit high; or TX Data & TX Data both high or both low)
I
CCTXS
I
EETXS
-
-
12
0
Note 2
1.0
mA
mA
Supply Current transmitting at 1MHz into a 35
load
at point A in Figure 4
(I
CCL
limits do not change with mode of operation
or duty cycle)
Duty Cycle
I
CCX
25
Note 4
45
Note 2
mA
25%
I
EEX
25
Note 3
35
Note 2
mA
100%
V
CCTX
Note 4
150
Note 2
mA
I
EETX
Note 3
135
Note 2
mA
Input Characteristics, TX Data In or TX Data In
"0" Input Current (V
IN
= 0.4 V)
"1" Input Current (V
IN
= 2.7 V)
"0" Input Voltage
"1" Input VoltageV
I
ILD
I
IHD
V
ILD
V
IHD
-
-
-
2.0
-
-
-
-
-1.2
100
0.7
-
mA
a
V
V
Inhibit Characteristic
"0" Input Current (V
IN
= 0.4 V)
"1" Input Current (V
IN
= 2.7 V)
"0" Input Voltage
"1" Input Voltage
Delay from TX Inhibit (0
1) to inhibited output impedance
Delay from TX Inhibit (1
0) to active output impedance
Differential output noise, inhibit mode
Differential output impedance (inhibited) at 1MHz
I
ILI
I
IHI
V
ILI
V
IHI
I
t
DXOFF
t
DXON
V
NOI
Z
OI
-
-
-
2.0
-
-
-
10K
-
-
-
-
300
100
-
-
-0.8
50
0.7
-
450
350
10
-
mA
A
V
V
ns
ns
mV
PEAK
Output Characteristics (Figure 3)
Differential output level (140 ohm load)
Differential Active output impedance at 1MHz
Rise and Fall times (10% to 90% of p-p output)
Output offset at point A in Fig. 4 (35
load) 2.5S after mid-bit
crossing of the parity bit of the last word of a 660S message
Delay from 50% point of TX Data or TX Data input to zero
crossing of differential output
V
O
Z
OA
t
R
/ t
F
V
OS
t
DTX
28
-
200
-
-
32
-
-
20
220
35
10
300
75
350
Vp-p
ns
mVpeak
ns
Note 2: Maximum supply currents for driver and receiver combined are included in power and thermal data table.
Electrical Characteristics con't
Parameter / Condition
Sym
Min
Typ
Max
Unit
Aeroflex Circuit Technology
5
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Power and Thermal Data, Total Hybrid (Driver and Receiver)
Total Supply Current, "Standby" mode or transmitting at less than
1% duty cycle (e.g. 20S of transmission every 2mS or longer
interval)
I
CCS
I
EES
I
CCL
-
-
-
40
30
35
50
40
45
mA
mA
mA
Total Supply Current transmitting at 1MHz into a 35
load at point A in Figure 4
(I
CCL
limits do not change with mode of operation
or duty cycle)
Duty Cycle
I
CC
25
Note 4
70
80
mA
25%
I
EE
25
Note 4
65
75
mA
100%
I
CC
100
Note 4
175
190
mA
I
EE
100
Note 3
165
180
mA
Power Dissipation of most critical (hottest) device in
hybrid during continuous transmission
(100% duty cycle)
Supply
Voltage
12V
15V
P
C
12
P
C
15
Note 3
Note 3
300
450
400
600
mA
mA
Thermal Resistance, junction-to-case, of most critical device
JC
-
80
100
C / W
Allowable transmitting duty cycle when case is held to +100C
maximum
Note 5
-
-
100
%
Allowable transmitting duty cycle when case is held
to +125C maximum
Supply
Voltage
12V
15V
Note 5
Note 5
-
-
-
-
80
55
%
%
Note 3: Decreases linearly to zero at zero duty cycle.
Note 4: Decreases linearly to applicable "Standby" value at zero duty cycle.
Note 5: Based upon operating junction temperature of 160C for hottest device. For lower operating junction temperatures,
reduce maximum duty cycle accordingly.
Electrical Characteristics con't
Parameter / Condition
Sym
Min
Typ
Max
Unit
Figure 2 Receiver Logic Waveforms
LINE-TO-LINE
INPUT
DATA
OUT
DATA
OUT
INPUT tr
90%
10%
NOTE: BOTH OUTPUTS HIGH
WITH NO INPUT OR STROBE
AT LOGIC "0"
OVERLAP
V
TH1
(p-p) x INPUT tr
0.8 x V
IN
(
p-p
)
V
IN
(
p-p
)
Aeroflex Circuit Technology
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SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Figure 5 Typical Power Dissipation (Total Hybrid)
Figure 4 Typical Input / Output Connections
Figure 3 Driver Logic Waveforms
Aeroflex ACT15530
or
Harris HD15530
CT3232
22
22
23
16
15
HI OR LOW
INHIBIT
BOTH HIGH
OR BOTH LOW
= INHIBIT
TX DATA IN
TX DATA IN
t
DTX
V
O
t
R
t
DXOFF
t
DXON
OVERRIDING
INHIBIT
50%
HI OR LOW
10%
90%
BIPOLAR
ONE
OUT
BIPOLAR
ZERO
OUT
BIPOLAR
ZERO
OUT
BIPOLAR
ONE
OUT
Taps at 1:.707 For
Stub Coupling
CT
}
A
For
Direct
Coupling
(1 : 1)
55
55
Do not
Connect
2
1
10
7
22
15
17
7
6
TECHNITROL
T1553-1
OR EQUIVALENT
TRANSFORMER
CT3232
RX
DATA
IN
RX
DATA
IN
TX
DATA
OUT
TX
DATA
IN
TX
DATA
IN
RX
OUT
DATA
RX
OUT
DATA
TX
DATA
OUT
Note: Case Temperature must be held to +100C Maximum
PO
W
E
R
D
I
SSIP
A
TIO
N
W
A
T
T
S
0 10 20 30 40 50 60 70 80 90 100
4
3
2
1
0
DUTY CYCLE PERCENT
12V
15V
for 100% Duty Cycle. For Operation at Case Temperature
of +125C, See "Power and Thermal Data".
Transmit & Receive Time
% Duty Cycle =
Transmit Time
x 100
Aeroflex Circuit Technology
7
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Pin #
Function
Pin #
Function
1
Tx Data Out
13
+V
CCRX
2
Tx Data Out
14
NC
3
Ground C
15
Rx Data In
4
+V
CCTX
16
Rx Data In
5
Ext. Data Threshold
17
Ground A
6
Int. Data Threshold
18
Case
7
Rx Data Out
19
-V
EERX
8
Strobe
20
+V
CCL
(+5V)
9
Ground B
21
Tx Inhibit
10
Rx Data Out
22
Tx Data In
11
Int. Data Threshold
23
Tx Data In
12
Ext. Data Threshold
24
-V
EETX
Table I CT3232 Pin Out Description (Plug-In & Flat Package)
Figure 6 Package Outline Drawings
1.27
MAX
24
13
12
1.10
MAX
.24
MIN
.018 DIA.
.002
.100 Typ
.002
1.27
.080 .015
.009
.002
Notes: 1. Dimensions shown are in inches.
2. Pins are equally spaced at .100 .002 tolerance non-cumulative each row.
1.27 MAX
1.10
1.27 MAX
.017
.400
MIN
2 sides
PLUG-IN PACKAGE
.100
0.167 for Low Profile Flat Pack
0.200 for Std Flat Pack
.175
Pin 1 & ESD
Designator
Pin 1 & ESD
Designator
FLAT PACKAGE
TOP VIEW
TOP VIEW
12
13
24
MAX
1.10
Aeroflex Circuit Technology
8
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
C I R C U I T T E C H N O L O G Y
Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11803
Telephone: (516) 694-6700
FAX: (516) 694-6715
Toll Free Inquiries: (800) THE-1553
Specifications subject to change without notice
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E-Mail: sales-act@aeroflex.com
The information contained in this data sheet is believed to be accurate; however, Aeroflex Laboratories Incorporated assumes no
responsibility for its use, and no license or rights are granted by implication or otherwise in connection therewith.
Ordering Information
Model Number
Screening
Package
CT3232M
Military Temperature, -55C to +125C,
Screened to the Individual Test Methods of
MIL-STD-883
Plug-In
CT3232MFP
Flat Package
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