Standard Products
ACT4433 Dual Transceivers
for MIL-STD-1553 / MIL-STD-1760 & SAE-AS15531
www.aeroflex.com/Avionics
February 18, 2005
FEATURES
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Small size, light weight and low power dissipation dual transceiver
Smaller Case Outline then ACT4489D
Bipolar supply ±12V, Logic supply +5V
Outstanding MIL-STD-1553 / MIL-STD-1760
/
SAE-AS15531 performance
Monolithic construction
Designed for commercial, industrial and aerospace applications
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
GENERAL DESCRIPTION
The Aeroflex-Plainview ACT4433 is a next generation monolithic transceiver design which provides full compliance
to MIL-STD-1553A/B and 1760 requirements in a small package with lower pin count then the ACT4489D, for
those designs with less board space.
The dual channel Model ACT4433 performs the front-end analog function of inputting and outputting data through a
transformer to the MIL-STD-1553 data bus.
Design of this transceiver reflects particular attention to active filter performance. This results in low bit and word
error rate with superior waveform purity and minimal zero crossover distortion. Efficient transmitter electrical and
thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles.
Each channel of the dual transceiver is completely separate from the other and fully independent. This includes
power leads as well as signal lines. Hence, each channel may be connected to a different data bus with no interaction.
TRANSMITTER
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 ratio
transformer the data bus signal is typically 7 Volts P-P at point A (See Figure 5). When both DATA and DATA inputs
are held low or high, the transmitter output becomes a high impedance and is “removed” from the line. In addition, an
overriding “INHIBIT" input provides for the removal of the transmitter output from the line. A logic “1” signal
applied to the “INHIBIT” takes priority over the condition of the data inputs and disables the transmitter (See
Transmitter Logic Waveform, Figure 1).
The Transmitter may be safely operated for an indefinite period with the 1553 bus (point A) short circuited at 100%
duty cycle.
RECEIVER
The 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 of the input beyond a pre-determined
threshold (See Receiver Logic Waveform, Figure 2).
The pre-set internal thresholds will detect data bus signals, point A Figure 5, exceeding 1.20 Volts P-P and reject
signals less than 0.6 Volts P-P when used with a transformer (See Figure 5 for transformer data and typical
connection).
A low level at the RX Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is
recommended.
SCD4433D Rev C
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V (V
L
)
+12 V (V
CC
)
-12 V (V
EE
)
GND1
GND2
GND3
RX STROBE IN
RX DATA IN
RX DATA IN
CASE
TX DATA OUT
DRIVER
ACTIVE
FILTER
OUTPUT
STAGE
TX DATA OUT
REFERENCE
COMP.
RX DATA OUT
INPUT
AMPLIFIER
ACTIVE
FILTER
COMP.
RX DATA OUT
BLOCK DIAGRAM (WITHOUT TRANSFORMER)
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
NOTE:
DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them,
and must be in the same state during off times (both high or low).
FIGURE 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED
LINE TO LINE
INPUT
STROBE
DATA OUT
DATA OUT
Note overlap
FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED
SCD4433D Rev C
2
ABSOLUTE MAXIMUM RATINGS
Operating Case Temperature
Storage Case Temperature
Power Supply Voltages
V
CC
V
EE
V
L
Logic Input Voltage
Receiver Differential Input
Receiver Input Voltage (Common Mode)
Driver Peak Output Current
Total Package Power Dissipation over the Full Operating
Case Temperature Range
Maximum junction to Case Temperature
Thermal resistance – Junction to Case
-55°C to +125°C
-65°C to +150°C
-0.3 V
DC
to +18 V
DC
+0.3 V
DC
to -18 V
DC
-0.3 V
DC
to +7.0 V
DC
-0.3 V
DC
to +5.5 V
DC
±40V
P
-
P
±10V
300 mA
2.5 Watts
(Note: Normal operation conditions require one transmitter
on and the other off at any given time)
10°C
4°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION
2/ 3/
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN
Parameter
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Condition
V
IN
= 0.4V
V
IN
= 2.7V
Symbol
I
ILD
I
IHD
V
ILD
V
IHD
Min
-
-
-
2.0
Typ
-0.1
1
-
-
Max
-0.2
40
0.7
-
Unit
mA
µA
V
V
INHIBIT CHARACTERISTICS
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Delay from TX inhibit, (0➝1) to inhibited output
Delay from TX inhibit, (1➝0) to active output
Differential Output Noise, inhibit mode
Differential Output Impedance (inhibited) Note 1.
See Figure 5
Point B
Point C
From mid pt
inhibit to ±1.2V
Figure 5,
Point B
V
IN
= 0.4V
V
IN
= 2.7V
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
Z
OI
-
-
-
2
-
-
-
2K
1K
-0.1
1.0
-
-
175
90
2
-
-
-0.2
40
0.7
-
225
150
10
-
-
mA
µA
V
V
nS
nS
mVp-p
Ω
Ω
OUTPUT CHARACTERISTICS
Differential output level
Rise and fall times (10% to 90% of Vp-p output)
Output Offset at point A on Figure 3, 2.5µS after
midpoint 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 signal
SCD4433D Rev C
Figure 5,
Point A
V
O
6.5
100
-
-
7.5
160
-
100
9.0
300
±90
200
Vp-p
nS
mVpeak
nS
t
R
/ t
F
V
OS
t
DTX
3
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION
Parameter
Differential Voltage Range, Figure 5 Point B
Common Mode Rejection Ratio (Note 3)
"1" State – Rx Data or Rx Data Output
"0" State – Rx Data or Rx Data Output
Delay (average) from Differential Input Zero
Crossings to RX DATA and RX DATA Output 50%
points
Input Threshold Voltage (referred to the bus)
100KHz–1MHz
I
OH
= -0.4 mA
I
OI
= 4 mA
Condition
TXFMR 1:1
Symbol
V
IDR
CMRR
V
OH
V
OL
Min
-
45
2.5
-
-
0.60
Typ
-
-
3.7
0.35
270
0.75
Max
40
-
-
0.5
400
1.15
Unit
V
PK
dB
V
V
nS
V
P
-
P
t
DXT
V
TH
STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT)
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Strobe Delay (Turn-on or Turn-off)
V
S
= 0.4V
V
S
= 2.7V
I
IL
I
IH
V
IL
V
IH
-
-
-
2.0
-
-0.1
1
-
-
50
-0.2
+40
0.7
-
100
mA
µA
V
V
nS
t
SD
POWER DATA
POWER SUPPLY CURRENTS – PER CHANNEL – SEE FIGURE 4
Transmitter Standby
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
I
CC
I
EE
I
L
-
-
-
-
-
-
-
-
-
-
-
-
0
12
18
58
12
18
115
12
18
230
12
18
1
16
30
63
20
30
mA
125
20
30
250
20
30
25% duty cycle
50% duty cycle
100% duty cycle
POWER SUPPLY VOLTAGES
±12V Operating Power Supply Voltage Range
+5V Operating Power Supply Voltage Range)
V
CC
V
EE
V
L
+11.40 +12.00 +12.60
-11.40 -12.00 -12.60
+4.75
+5.00
+5.25
V
V
V
Notes:
1. Power on or off, measured from 75KHz to 1MHz at point A and transformer self impedance of 3KΩ minimum at 1MHz.
2. Power Supplies: +12 Volts ±0.60 V & +5 Volts ±0.5V, bypassed by 10 µF (Tantalum recommended) Capacitor minimum. All
measurements & specifications apply over the temperature range of -55°C to +125°C (Case temperature) unless otherwise specified.
3. When measured as shown per Figure 5 with ± 10 Volt peak, line to ground, DC to 2MHz
4. Typical power is measured with V
BUS
at point A = 7.5 VP-P
SCD4433D Rev C
4
LAST BIT
Magnified View
OUTPUT OFFSET
*
*
Transformer Coupled Stub
70Ω
0 Volts
OUTPUT OFFSET
2.5 µS
ACT4433
*
Offset measured at point A in Figure 5
TX DATA OUT
1:0.707
7
3
2
C
1:1.4 52.5Ω
FIGURE 3 – TRANSMITTER (TX) OUTPUT
OFFSET
A
TX DATA OUT
RX DATA IN
RX DATA IN
1
5
T1553-1
Zoi
V
CM
52.5Ω
Direct Coupled Stub
ACT4433
TX DATA OUT
3.0W
POWER DISSIPATION
MILLIWATTS
2800
2400
2000
1600
1200
800
400
0
0
10
20
30
40
50
60
Typical Hybrid
Dissipation
Typical Hybrid Input Power
TX DATA OUT
1.9W
RX DATA IN
RX DATA IN
4
1
T1553-1
52.5Ω
Zoi
70Ω
1:1
3
2
8
B
A
3600
3200
52.5Ω
0.270
70
80
90 100
Transformer Model use Technitrol Part# 1553-1
or equivalent
DUTY CYCLE – PERCENT
Note: V
CC
= +12V, V
EE
= -12V, V
L
= +5V, Transformer ratio 1:1,
V
BUS
(point A) at 7VP-P.
FIGURE 5 – TYPICAL 1553 BUS
CONNECTION
FIGURE 4 – POWER DISSIPATION VS.
DUTY CYCLE
(Total hybrid with one channel transmitting
and the other not powered)
SCD4433D Rev C
5
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