Standard Products
CT3231M Low Power Driver / Receiver
for MIL-STD-1553B & SAE-AS15531
www.aeroflex.com/Avionics
March 15, 2005
FEATURES
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±12V to ±15V/+5V DC power supply operation
1.5Watt total hybrid dissipation at 25% transmitting duty cycle
Monolithic construction
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
Designed for commercial, industrial and aerospace applications
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
Packaging – hermetic metal plug-in or flat package
24 Lead, 1.27" sq. max x .200"H Flat package
24 Pin, 1.27" sq. max x .175"H Plug-In package
DRIVER DESCRIPTION
The CT3231 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. It is recommended that those inputs be driven from a “D” type flip-flop.
RECEIVER DESCRIPTION
The CT3231 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.
SCDCT3231 Rev B
+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 – CT3231 Functional Block Diagram and Pinouts
SCDCT3231 Rev B
2
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Positive Supply Voltage, Pin 4 or 13
Negative Supply Voltage, Pin 24 or 19
Logic 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 +5.5
±20 (40Vp-p)
±15
±300
4.0 (Note 1)
See Figure 5
- 55 to + 125
°C
UNITS
Volts
Volts
Volts
Volts
Volts
Volts
mA
Watts
ELECTRICAL CHARACTERISTICS
RECEIVER SECTION
Parameter / Condition
Power Supply Voltage Ranges
Sym
V
CCRX
V
EERX
V
CCL
I
CCRX
I
EERX
I
CCL
DC
f = 1MHz
R
IN
Z
IN
V
IDR
V
ICR
CMRR
I
IL
I
IH
V
IL
V
IH
t
SD
Min
+11.75
-11.75
+4.75
-
-
-
6K
4K
±20
±10
40
-
-
-
2.0
-
Typ
-
-
-
25
30
35
-
-
-
-
-
-
-
-
-
6
Max
+15.75
-15.75
+5.25
-
-
-
-
-
-
-
-
-4
400
0.7
-
-
Unit
V
V
V
mA
mA
mA
Supply Current
Differential Input Impedance
Ω
Ω
Vpeak
Vpeak
dB
mA
µA
V
V
ns
Differential Voltage Range
Input Common Mode Voltage Range
Common Mode Rejection Ratio (From Point A, Figure 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)
SCDCT3231 Rev B
V
TH
1
R
TH
/V
TH
1
V
TH
2
V
TH
3
0.6
-
-
4000
0.9
-
Vp-p
Ω/
Vp-p
f = 2MHz
f = 4MHz
3
0.8
4.2
-
-
1.5
8.5
Vp-p
Vp-p
ELECTRICAL CHARACTERISTICS con’t
RECEIVER SECTION
Parameter / Condition
Output Characteristics, RX Data & RX 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).
Sym
V
OH
V
OL
Min
2.5
-
Typ
3.3
-
Max
-
0.5
Unit
V
V
t
DRX
-
190
450
ns
DRIVER SECTION
Parameter / Condition
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 35
Ω
load
at point A in Figure 4
Note: 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 Voltage
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 (35
Ω
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%
Sym
V
CCTX
V
EETXL
I
CCTXS
I
EETXS
I
CCX
25
I
EEX
25
V
CCTX
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
Min
+11.75
-11.75
-
-
Note 4
Note 3
Note 4
Note 3
-
-
-
2.0
-
-
-
2.0
-
-
-
10K
26
-
100
-
-
Typ
-
-
12
0
45
35
150
135
-
-
-
-
-
-
-
-
300
100
-
-
30
4
150
±20
100
Max
+15.75
-15.75
Note 2
1.0
Note 2
Note 2
Note 2
Note 2
-1.2
100
0.7
-
-0.8
50
0.7
-
400
250
10
-
35
-
300
±75
250
Unit
V
V
mA
mA
mA
mA
mA
mA
mA
µa
V
V
mA
µA
V
V
ns
ns
mV
PEAK
Ω
Vp-p
Ω
ns
mVpeak
ns
Note 2: Maximum supply currents for driver and receiver combined are included in power and thermal data table.
SCDCT3231 Rev B
4
ELECTRICAL CHARACTERISTICS con’t
POWER AND THERMAL DATA, TOTAL HYBRID (DRIVER AND RECEIVER) SECTION
Parameter / Condition
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 35
Ω
load at point A in Figure 4
Note: Iccl 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)
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
Duty Cycle
25%
100%
Sym
I
CCS
I
EES
I
CCL
I
CC
25
I
EE
25
I
CC
100
I
EE
100
Supply
Voltage
±12V
±15V
Min
-
-
-
Note 4
Note 4
Note 4
Note 3
Typ
40
30
35
70
65
175
165
Max
50
40
45
80
75
190
180
Unit
mA
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
mW
mW
°C / W
%
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
SCDCT3231 Rev B
5
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