Standard Products
ACT4454/4460 Single Supply Dual Transceivers
for MIL-STD-1553A/B & MacAir A3818, A4905, A5232, A5690
& SAE-AS15531
www.aeroflex.com/Avionics
November 10, 2004
FEATURES
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Small size, light weight and low standby power dual transceivers
Single +5V power supply
Monolithic construction
Input and output TTL compatible design
Designed for commercial, industrial and aerospace applications
Processed and screened to MIL-STD-883 specs
MIL-PRF-38534 compliant devices available
Aeroflex-Plainview is a Class H & K MIL-PRF-38534 manufacturer
DESC SMD# 5962–92061
ACT 4454
Case Style
Actual Size
GENERAL DESCRIPTION
The Aeroflex-Plainview ACT4454/4460 series are next generation monolithic transceiver designs which provides full
compliance with MIL-STD-1553A /B, MacAir A3818, A5690, A5232, A4905 and meets SAE-AS15531 requirements in the
smallest packages with low power consumption and single power supply operation. The series performs the front-end analog
function of inputting and outputting data through a transformer to the MIL-STD-1553 data bus.
The ACT4454/4460 series can be considered a "Universal" Transceiver in that it is compatible with MIL-STD-1553A & B,
Macair A-3818, A-4905, A-5232, A-5690, A-5690, and meets SAE-AS15531.
Design of these transceivers 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 1:2.5 ratio transformer
the data bus signal is typically 7.0 volts P-P at A-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” applied to the “INHIBIT” takes priority over the
condition of the data inputs and disables the transmitter (See Figure 1 Transmitter Logic Waveform). The Transmitter may be
safely operated for an indefinite period with the bus (point A-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 Figure 2
Receiver Logic Waveform) .
The pre-set internal thresholds will detect data bus signals 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 connections).
A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended.
SCD4454 Rev B
TX DATA IN
TX DATA IN
TX DATA OUT
DRIVER
ACTIVE
FILTER
OUTPUT
STAGE
TX DATA OUT
TX INHIBIT
+5 V
REFERENCE
COMP.
RX DATA OUT
+5V RTN
RX DATA IN
RX DATA IN
INPUT
AMPLIFIER
ACTIVE
FILTER
COMP
.
RX DATA OUT
STROBE
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
* See Figure 7 for Actual Waveforms
Note overlap
FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED *
SCD4454 Rev B
2
ABSOLUTE MAXIMUM RATINGS
Operating case temperature
Storage case temperature
Power supply voltage
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
-0.3V
DC
to +7.0V
DC
-0.3V
DC
to +5.5V
DC
±10 V
±5V
800 mA
2.0 Watts
(Note: Normal operation conditions require one transmitter on and the
other off at any given time)
10°C
5°C/W
ELECTRICAL CHARACTERISTICS – DRIVER SECTION
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN
(Notes 2 & 3 Apply)
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
-0.2
1
-
-
Max
-0.4
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
V
IN
= 0.4V
V
IN
= 2.7V
I
ILI
I
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
-
-
-
2
-
-
-
2K
-0.2
1.0
-
-
250
150
2
-
-0.4
40
0.7
-
450
450
10
-
mA
µA
V
V
nS
nS
mVp-p
Ω
OUTPUT CHARACTERISTICS
Differential output level
Rise and fall times (10% to 90% of p-p output)
Output offset at point A-A’ on Figure 5, 2.5 µS
after midpoint crossing of the parity bit of the last
word of a 600µS message
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
SCD4454 Rev B
R
L
= 35
Ω
V
O
6.3
200
-
-
7.0
240
-
290
7.7
300
±90
400
Vp-p
nS
mVpeak
nS
t
r
R
L
= 35
Ω
V
OS
t
DTX
3
ELECTRICAL CHARACTERISTICS – RECEIVER SECTION
Parameter
Differential Voltage Range
(See Figure 5, point P-P’)
Common Mode Rejection Ratio (Note 3)
Condition
TXFMR
2.5 :1
Symbol
V
IDR
CMRR
Min
-
45
Typ
14
-
Max
20
-
Unit
Vp-p
dB
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
-
-0.2
1
-
-
50
-0.4
+40
0.7
-
100
mA
µA
V
V
nS
t
SD
THRESHOLD CHARACTERISTICS (SINEWAVE INPUT )
Internal Threshold Voltage (Referred to the bus)
100KHz-1MHz
V
TH
0.60
0.82
1.10
Vp-p
OUTPUT CHARACTERISTICS, RX DATA AND RX DATA
"1" State
"0" State
Delay, (average) from differential input zero
crossings to RX DATA and RX DATA output
I
OH
= -0.4mA
I
OL
= -4mA
50% points
V
OH
V
OL
2.5
-
-
3.7
0.35
340
-
0.5
500
V
V
nS
t
DRX
POWER DATA
POWER SUPPLY CURRENTS – PER CHANNEL
Transmitter Standby
25% Duty Cycle
50% Duty Cycle
100% Duty Cycle
Note 4
I
CC
-
-
-
-
13
170
320
700
30
195
345
750
mA
POWER SUPPLY VOLTAGE
Operating Power Supply Voltage Range
V
CC
+4.75
+5.00
+5.50
V
NOTES:
1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3KΩ minimum.
2. V
CC
= 5 Volts ±0.1 V, bypassed by 2.2 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 at point A-A’ with ± 10 Volt peak, line to ground, DC to 2MHz.
4. Typical power is measured with V
bus
at point A-A’ = 7.0 Vp-p.
SCD4454 Rev B
4
LAST BIT
t
f
*
90%
Magnified View
OUTPUT OFFSET
*
*
6V P-P MIN
9V P-P MAX
0 Volts
0 volts
OUTPUT OFFSET
10%
2.5 µsec
t
r
*
*
Rise and fall times measured at point A-A' in Figure 5
*
Offset measured at point A-A' in Figure 5
FIGURE 3 – TRANSMITTER (TX) OUTPUT
WAVEFORM
FIGURE 4 – TRANSMITTER (TX) OUTPUT
OFFSET
2200
70Ω
70Ω
2000
1800
POWER DISSIPATION
MILLIWATTS
1600
1400
Maximum
1200
1000
Typical
800
600
400
200
0
0
10
20
30
40
50
60
70
80
90 100
N1:N2
TX DATA OUT
P
B
52.5Ω
A
Center
Tap
N1:N3 for
Stub
Coupling
TX DATA OUT
RX DATA IN
RX DATA IN
P'
B'
52.5Ω
A'
Transformer turns ratios:
N1:N2 = 1:2.5
N1:N3 = 1:1.77
Use Technitrol 1553-45 or equivalent
DUTY CYCLE – PERCENT
Note: V
CC
=5 Volts,Transformer ratio 1:2.5, V
BUS
(pt A-A') at 7.0 Volts P-P
FIGURE 5 – TYPICAL TRANSFORMER
DIRECT CONNECTION
FIGURE 6 – POWER DISSIPATION VS.
DUTY CYCLE
(Total, hybrid with one channel transmitting
and the other not powered)
SCD4454 Rev B
5
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