CT 3232M
Low Power Driver / Receiver
For MIL-STD-1553 & Macair
Features
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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 (-55°C to +125°C) 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
CIRCUIT TECHNOLOGY
Packaging – Hermetic Metal Plug-In or Flat Package
www.aeroflex.com
•
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 140Ω load at the output. When coupled to the
Data Bus with a 1:1 transformer, isolated on the Data Bus side with two 55.0Ω fault isolation
resistors, and loaded by two 70Ω 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 2KΩ pull-up to
+5V is recommended.
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCDCT3232 REV A 6/27/02
+V
CCRX
INT. DATA THRES.
13
6
+ REG
(
≈
10V )
V+
5
–
LEVEL
DET.
+
+
LINEAR
AMP
–
FILTER
V+
–
LEVEL
DET.
+
– REG
(
≈
-10V
)
V–
EXT. DATA THRES.
7
RX DATA OUT
RX DATA IN
RX DATA IN
15
16
8
STROBE
10
RX DATA OUT
INT. DATA THRES.
-V
EERX
GROUND A
CASE
11
19
17
18
V–
12
9
EXT. DATA THRES.
GROUND B
NOTE: GROUNDS A, B, & C
MUST ALL BE EXTERNALLY
GROUNDED
+5V
+V
CCL
20
4
TX INHIBIT
+V
CCTX
21
LINEAR
AMP
2
TX DATA OUT
TX DATA IN
22
3
GROUND C
TX DATA IN
23
LINEAR
AMP
1
TX DATA OUT
24
- V
EETX
Figure 1 – CT3232 Functional Block Diagram and Pinouts
Aeroflex Circuit Technology
2
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Absolute Maximum Ratings
Parameter
Supply Voltage, Pin 4 or 13
Supply Voltage, Pin 24 or 19
Supply Voltage, Pin 20
Logic Input Voltage, Pin 8, 21, 22, or 23
Receiver Differential Input, Pin 15 to Pin 16
Receiver Input Voltage, Pin 15 or Pin 16
Driver Peak Output Current, Pin 1 or Pin 2
Total Package Power Dissipation at (Ambient) T
A
= + 25°C
(Derate above T
A
= + 25°C at 40 mW/°C)
Power Dissipation at Specified Case Temperatures
Operating Case Temperature Range (T
C
)
(See Figure 5 for limitations)
Range
-0.3 to +18.0
0.3 to -18.0
-0.3 to + 7.0
-0.3 to +5.5V
±20 (40 Vp-p)
±15
±300
4.0 (Note 1)
See Figure 5
-55 to +125
Units
Volts
Volts
Volts
Volts
Volts
Volts
mA
Watts
°C
Electrical Characteristics
Parameter / Condition
Sym
Min
Typ
Max
Unit
Receiver
Power Supply Voltage Ranges
V
CCRX
V
EERX
V
CCL
I
CCRX
I
EERX
I
CCL
f=1MHz
Z
IN
V
IDR
V
ICR
CMRR
I
IL
I
IH
V
IL
V
IH
t
SD
+11.75
-11.75
+4.75
-
-
-
9K
±20
±10
40
-
-
-
2.0
-
-
-
-
25
30
35
-
-
-
-
-
-
-
-
20
+15.75
-15.75
+5.25
-
-
-
-
-
-
-
-4
400
0.7
-
-
V
V
V
mA
mA
mA
Ω
Vpeak
Vpeak
dB
mA
µA
V
V
ns
Supply Current
Differential Input Impedance
Differential Voltage Range
Input Common Mode Voltage Range
Common Mode Rejection Ratio (From Point A, Fig. 4)
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)
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
Ω
)
Filter Characteristics (Pin 6 & 11 Grounded)
(Sinewave input)
Aeroflex Circuit Technology
V
TH
1
R
TH
/V
TH
1
V
TH
2
V
TH
3
0.6
-
1.0
3.0
-
4000
-
-
1.0
-
3.0
-
Vp-p
Ω
/
Vp-p
Vp-p
Vp-p
f = 2MHz
f= 3MHz
3
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Electrical Characteristics con’t
Parameter / Condition
Sym
Min
Typ
Max
Unit
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.
Note 1: Assumes unit in free air (natural convection cooling).
V
OH
V
OL
2.5
-
3.3
-
-
0.5
V
V
t
DRX
-
290
450
ns
Driver
Power Supply Voltage Ranges
(See Receiver Section for V
CCL
)
Supply Current
,
“Standby” mode (See Receiver Section for I
CCL
)
(TX Inhibit high; or TX Data & TX Data both high or both low)
Supply Current transmitting at 1MHz into a 35Ω load
at point A in Figure 4
(I
CCL
limits do not change with mode of operation
or duty cycle)
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
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
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 (35Ω load) 2.5µS after mid-bit
crossing of the parity bit of the last word of a 660µS message
Delay from 50% point of TX Data or TX Data input to zero
crossing of differential output
Duty Cycle
25%
100%
I
EETX
I
ILD
I
IHD
V
ILD
V
IHD
I
ILI
I
IHI
V
ILI
V
IHI
I
t
DXOFF
t
DXON
V
NOI
Z
OI
V
O
Z
OA
t
R
/ t
F
V
OS
t
DTX
Note 3
-
-
-
2.0
-
-
-
2.0
-
-
-
10K
28
-
200
-
-
135
-
-
-
-
-
-
-
-
300
100
-
-
32
-
-
±20
220
Note 2
-1.2
100
0.7
-
-0.8
50
0.7
-
450
350
10
-
35
10
300
±75
350
mA
mA
µa
V
V
mA
µA
V
V
ns
ns
mV
PEAK
Ω
Vp-p
Ω
ns
mVpeak
ns
V
CCTX
V
EETXL
I
CCTXS
I
EETXS
I
CCX
25
I
EEX
25
V
CCTX
+11.75
-11.75
-
-
Note 4
Note 3
Note 4
-
-
12
0
45
35
150
+15.75
-15.75
Note 2
1.0
Note 2
Note 2
Note 2
V
V
mA
mA
mA
mA
mA
Note 2: Maximum supply currents for driver and receiver combined are included in power and thermal data table.
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4
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
Electrical Characteristics con’t
Parameter / Condition
Sym
Min
Typ
Max
Unit
Power and Thermal Data, Total Hybrid (Driver and Receiver)
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 Current transmitting at 1MHz into a 35Ω
load at point A in Figure 4
(I
CCL
limits do not change with mode of operation
or duty cycle)
Power Dissipation of most critical (hottest) device in
hybrid during continuous transmission
(100% duty cycle)
Duty Cycle
25%
100%
I
EE
100
Supply
Voltage
±12V
±15V
Note 3
165
180
mA
I
CCS
I
EES
I
CCL
I
CC
25
I
EE
25
I
CC
100
-
-
-
Note 4
Note 4
Note 4
40
30
35
70
65
175
50
40
45
80
75
190
mA
mA
mA
mA
mA
mA
P
C
12
P
C
15
Ø
JC
Note 5
Note 3
Note 3
-
-
300
450
80
-
400
600
100
100
mA
mA
°C / W
%
Thermal Resistance, junction-to-case, of most critical device
Allowable transmitting duty cycle when case is held to +100°C
maximum
Allowable transmitting duty cycle when case is held
to +125°C 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 160°C for hottest device. For lower operating junction temperatures,
reduce maximum duty cycle accordingly.
90%
LINE-TO-LINE
INPUT
INPUT tr
10%
DATA
OUT
DATA
OUT
NOTE: BOTH OUTPUTS HIGH
WITH NO INPUT OR STROBE
AT LOGIC "0"
V
IN
(
p-p
)
OVERLAP
≈
V
TH1
(p-p) x INPUT tr
0.8 x V
IN
(
p-p
)
Figure 2 – Receiver Logic Waveforms
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5
SCDCT3232 REV A 6/27/02 Plainview NY (516) 694-6700
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