Legacy CT3231M Low Power Driver/Receiver for MIL-STD-1553 (3/05)

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
+VCCRX
13
INT. DATA THRES.
6
RX DATA IN
RX DATA IN
+ REG
( ≈ 10V )
–
LEVEL
DET.
+
+
16
LINEAR
AMP
–
11
-VEERX
19
GROUND A
17
CASE
18
+VCCL
20
TX INHIBIT
21
FILTER
TX DATA IN
EXT. DATA THRES.
7
RX DATA OUT
8
STROBE
V+
–
LEVEL
DET.
+
– REG
( ≈ -10V )
10
RX DATA OUT
12
EXT. DATA THRES.
V–
9
GROUND B
4
+VCCTX
2
TX DATA OUT
3
GROUND C
1
TX DATA OUT
NOTE: GROUNDS A, B, & C
MUST ALL BE EXTERNALLY
GROUNDED
+5V
LINEAR
AMP
TX DATA IN
5
V–
15
INT. DATA THRES.
V+
22
23
LINEAR
AMP
24
- VEETX
FIGURE 1 – CT3231 Functional Block Diagram and Pinouts
SCDCT3231 Rev B
2
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RANGE
UNITS
Positive Supply Voltage, Pin 4 or 13
-0.3 to +18.0
Volts
Negative Supply Voltage, Pin 24 or 19
0.3 to -18.0
Volts
Logic Voltage, Pin 20
-0.3 to + 7.0
Volts
Logic Input Voltage, Pin 8, 21, 22, or 23
-0.3 to +5.5
Volts
±20 (40Vp-p)
Volts
Receiver Input Voltage, Pin 15 or Pin 16
±15
Volts
Driver Peak Output Current, Pin 1 or Pin 2
±300
mA
4.0 (Note 1)
Watts
Receiver Differential Input, Pin 15 to Pin 16
Total Package Power Dissipation at (Ambient) TA = + 25°C
(Derate above TA = + 25°C at 40 mW/°C)
Power Dissipation at Specified Case Temperatures
See Figure 5
Operating Case Temperature Range (TC)
(See Figure 5 for limitations)
- 55 to + 125
°C
ELECTRICAL CHARACTERISTICS
RECEIVER SECTION
Parameter / Condition
Sym
Min
Typ
Max
Unit
Power Supply Voltage Ranges
VCCRX
VEERX
VCCL
+11.75
-11.75
+4.75
-
+15.75
-15.75
+5.25
V
V
V
Supply Current
ICCRX
IEERX
ICCL
-
25
30
35
-
mA
mA
mA
RIN
ZIN
6K
4K
-
-
Ω
Ω
Differential Voltage Range
VIDR
±20
-
-
Vpeak
Input Common Mode Voltage Range
VICR
±10
-
-
Vpeak
CMRR
40
-
-
dB
IIL
IIH
VIL
VIH
tSD
2.0
-
6
-4
400
0.7
-
mA
µA
V
V
ns
VTH1
RTH /VTH1
0.6
-
4000
0.9
-
Ω/ Vp-p
VTH2
VTH3
0.8
4.2
-
1.5
8.5
Vp-p
Vp-p
Differential Input Impedance
DC
f = 1MHz
Common Mode Rejection Ratio (From Point A, Figure 4)
Strobe Characteristics (Logic “0” inhibits Output)
“0” Input Current (VSTROBE = 0.5 V)
“1” Input Current (VSTROBE = 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; RTH Max = 10KΩ)
Filter Characteristics (Pin 6 & 11 Grounded)
(Sinewave input)
f = 2MHz
f = 4MHz
SCDCT3231 Rev B
3
Vp-p
ELECTRICAL CHARACTERISTICS con’t
RECEIVER SECTION
Parameter / Condition
Sym
Min
Typ
Max
Unit
VOH
VOL
2.5
-
3.3
-
0.5
V
V
tDRX
-
190
450
ns
Sym
Min
Typ
Max
Unit
Power Supply Voltage Ranges
(See Receiver Section for VCCL)
VCCTX
VEETXL
+11.75
-11.75
-
+15.75
-15.75
V
V
Supply Current, “Standby” mode (See Receiver Section for ICCL)
(TX Inhibit high; or TX Data & TX Data both high or both low)
ICCTXS
IEETXS
-
12
0
Note 2
1.0
mA
mA
Supply Current transmitting at 1MHz into a 35Ω load
at point A in Figure 4
Duty Cycle
ICCX25
Note 4
45
Note 2
mA
25%
IEEX25
Note 3
35
Note 2
mA
Note: ICCL limits do not change with mode of
operation or duty cycle
100%
VCCTX
Note 4
150
Note 2
mA
IEETX
Note 3
135
Note 2
mA
IILD
IIHD
VILD
VIHD
2.0
-
-1.2
100
0.7
-
mA
µa
V
V
IILI
IIHI
VILI
VIHII
tDXOFF
tDXON
VNOI
ZOI
2.0
10K
300
100
-
-0.8
50
0.7
400
250
10
-
mA
µA
V
V
ns
ns
mVPEAK
VO
ZOA
tR / tF
VOS
26
100
-
30
4
150
±20
35
300
±75
Vp-p
ns
mVpeak
tDTX
-
100
250
ns
Output Characteristics, RX Data & RX Data
“1” State (ISOURCE = -0.4 mA) Note 2
“0” State (ISINK = 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).
DRIVER SECTION
Parameter / Condition
Input Characteristics, TX Data In or TX Data In
“0” Input Current (VIN = 0.4 V)
“1” Input Current (VIN = 2.7 V)
“0” Input Voltage
“1” Input Voltage
Inhibit Characteristic
“0” Input Current (VIN = 0.4 V)
“1” Input Current (VIN = 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
Note 2: Maximum supply currents for driver and receiver combined are included in power and thermal data table.
SCDCT3231 Rev B
4
Ω
Ω
ELECTRICAL CHARACTERISTICS con’t
POWER AND THERMAL DATA, TOTAL HYBRID (DRIVER AND RECEIVER) SECTION
Parameter / Condition
Sym
Min
Typ
Max
Unit
Total Supply Current, “Standby” mode or transmitting at less than
1% duty cycle (e.g. 20µS of transmission every 2mS or longer interval)
ICCS
IEES
ICCL
-
40
30
35
50
40
45
mA
mA
mA
Total Supply Current transmitting at 1MHz into a 35Ω
load at point A in Figure 4
Duty Cycle
ICC25
Note 4
70
80
mA
25%
IEE25
Note 4
65
75
mA
Note: Iccl limits do not change with mode of operation
or duty cycle
100%
ICC100
Note 4
175
190
mA
IEE100
Note 3
165
180
mA
PC12
PC15
Note 3
Note 3
300
450
400
600
mW
mW
ØJC
-
80
100
°C / W
Note 5
-
-
100
%
Note 5
Note 5
-
-
80
55
%
%
Power Dissipation of most critical (hottest) device in
hybrid during continuous transmission
(100% duty cycle)
Supply
Voltage
±12V
±15V
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 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
VIN(p-p)
10%
DATA
OUT
DATA
OUT
NOTE: BOTH OUTPUTS HIGH
WITH NO INPUT OR STROBE
AT LOGIC "0"
OVERLAP ≈ VTH1(p-p) x INPUT tr
0.8 x VIN (p-p)
FIGURE 2 – Receiver Logic Waveforms
SCDCT3231 Rev B
5
TX DATA IN
BOTH HIGH
OR BOTH LOW
= INHIBIT
TX DATA IN
tDTX
INHIBIT
OVERRIDING
INHIBIT
HI OR LOW
HI OR LOW
tDXON
tDXOFF
90%
tR
50%
VO
10%
FIGURE 3 – Driver Logic Waveforms
BIPOLAR
ZERO
OUT
15
22
TX
DATA
IN
TX
DATA
OUT
55Ω
(1 : 1)
1
CT
BIPOLAR
ONE
OUT
22
17
22
23
Do not
Connect
TX
DATA
IN
Aeroflex ACT15530
or
CT3231
TX
DATA
OUT
BIPOLAR
ZERO
OUT
7
6
10
7
A
55Ω
2
TECHNITROL
T1553-1
OR EQUIVALENT
TRANSFORMER
Harris HD15530
BIPOLAR
ONE
OUT
}
Taps at 1:.707 For
Stub Coupling
RX
DATA
OUT
RX
DATA
IN
15
RX
DATA
IN
16
RX
DATA
OUT
Aeroflex ACT15530
or
Harris HD15530
CT3231
FIGURE 4 – Typical Input / Output Connections
POWER DISSIPATION – WATTS
4
3
% Duty Cycle =
±15V
x 100
Transmit & Receive Time
±12V
2
Note: Case Temperature must be held to +100°C Maximum
for 100% Duty Cycle. for Operation at Case Temperature
of +125°C, See "Power and Thermal Data".
1
0
0
Transmit Time
10
20
30 40 50 60 70 80
DUTY CYCLE – PERCENT
90 100
FIGURE 5 – Typical Power Dissipation (Total Hybrid)
SCDCT3231 Rev B
6
For
Direct
Coupling
PLUG-IN PACKAGE
FLAT PACKAGE
TOP VIEW
1.27 MAX
TOP VIEW
1.27 MAX
1.10
.017
±.002
24
24
13
1.27
MAX
Designator
Pin 1 & ESD
1.27
MAX
1.10
1.10
.100 Typ
12
Designator
Pin 1 & ESD
12
13
.400
MIN
2 sides
.175
MAX
.009
±.002
.24
MIN
.018 DIA.
±.002
0.167 for Low Profile Flat Pack
0.200 for Std Flat Pack
.100
.080 ±.015
Notes:1. Dimensions shown are in inches.
2. Pins are equally spaced at .100 ±.002 tolerance non-cumulative each row.
FIGURE 6 – Package Outline Drawings
Pin #
Function
Pin #
Function
1
Tx Data Out
13
+VCCRX
2
Tx Data Out
14
NC
3
Ground C
15
Rx Data In
4
+VCCTX
16
Rx Data In
5
Ext. Data Threshold
17
Ground A
6
Int. Data Threshold
18
Case
7
Rx Data Out
19
-VEERX
8
Strobe
20
+VCCL (+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
-VEETX
TABLE I – CT3231 Pin Out Description (Plug-In & Flat Package)
SCDCT3231 Rev B
7
ORDERING INFORMATION
Model Number
CT3231M
Screening
Package
Military Temperature, -55°C to +125°C,
Screened to the Individual Test Methods of MIL-STD-883
Plug-In
CT3231MFP
Flat Package
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Aeroflex Microelectronic Solutions reserves the right to
change at any time without notice the specifications, design,
function, or form of its products described herein. All
parameters must be validated for each customer's application
by engineering. No liability is assumed as a result of use of
this product. No patent licenses are implied.
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SCDCT3231 Rev B
8