SCD4444 Rev B
FEATURES
Transceiver meets MIL-STD-1553A & B, Macair A3818, A4905, A5232 and A5690 specs
Bipolar Supply 15V to 12V, Logic Supply +5V
Replacement for function of CT3232 & ACT4404 in new designs
Voltage source output
Monolithic construction
Aeroflex is a Class H & K MIL-PRF-38534 Manufacturer
Miniature Chipscale Package Bumped Chip Carrier
TM
(BCC++)
GENERAL DESCRIPTION
The Aeroflex Laboratories transceiver model ACT4444 is a monolithic transceiver which provides full compliance with Macair and
MIL-STD-1553 data bus requirements. The model ACT4444 performs the front-end analog function of inputting and outputting data through a
transformer to a MIL-STD-1553 or Macair data bus with a few external components.
The ACT4444 can be considered a "Universal" Transceiver in that it is compatible with MIL-STD-1553A, B, Macair A-3818, A-4905, A-5232
and A-5690.
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. The ACT4444 active filter design has additional high frequency roll-off to provide the
required Macair low harmonic distortion waveform without increasing the pulse delay characteristics significantly.
Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high and well as low duty cycles.
An optional receiver input threshold adjustment can be accomplished by the use of the "External Threshold" terminals.
TRANSMITTER
The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 transformer, isolated on the data bus
side with two 55 Ohm fault isolation resistors, and loaded by two 70 thru 85 Ohm terminations plus additional receivers, the data bus signal
produced is 7.0 Volts minimum P-P at A-A' (See Figure 3 or 4). 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 Transmitter Logic Waveforms - Figure 1).
The transmitter utilizes an active filter to suppress harmonics above 1 MHz to meet Macair specifications A-3818, A-4905, A-5232 and A-5690.
The transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit.
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 Waveforms -
Figure 2).
The internal threshold is nominally set to detect data bus signals exceeding 1.05 Volts P-P and reject signals less than 0.6 Volts P-P when used
with a 1:1 turns ratio transformer (See Figure 3 or 4 for transformer data and typical connections). This threshold setting can be held by
grounding the appropriate pins or modified with the use of external resistors.
A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K Ohm pull-up to +5 Volts is recommended.
NOTE: BCC++ and Bumped Chip Carrier are Trademarks of Fujitsu Ltd.
ACT4444 Transceiver
Standard Products
for MIL-STD-1553 / MACAIR in a Chipscale Package
October 1, 2003
Preliminary
2
SCD4444 Rev B
DATA IN
DATA IN
INHIBIT
LINE TO LINE
OUTPUT
Notes:
2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.
3. DATA and DATA must be in the same state during off time (both high or low).
FIGURE 1 - TRANSMITTER LOGIC WAVEFORMS
FIGURE 2 - RECEIVER LOGIC WAVEFORMS
Note overlap
LINE TO LINE
INPUT
DATA OUT
DATA OUT
1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal.
NORMALLY HIGH OR LOW OUTPUT IN STANDBY (SEE FIGURE 3 OR 4)
SHAPING
OUTPUT
STAGE
COMP.
COMP.
ACTIVE
FILTER
INPUT
AMP
DRIVER
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
RX DATA IN
RX DATA IN
STROBE
TX DATA OUT
TX DATA OUT
RX DATA OUT
RX DATA OUT
-12V or -15V
EXT. THRESHOLD
DATA
SET INTERNAL
DATA
DATA
EXT. THRESHOLD
DATA
+15V or +12V
V+
V-
THRESHOLD
BLOCK DIAGRAM (WITHOUT TRANSFORMER)
3
SCD4444 Rev B
ABSOLUTE MAXIMUM RATINGS
Operating Case Temperature
-40C to +85C
Storage Case Temperature
-65C to +150C
Power Supply Voltages
16 V
+7 V
Logic Input Voltage
-0.3 V to +5.5 V
Receiver Differential Input
40 V
Receiver Input Voltage (Common Mode)
10V
Driver Peak Output Current
150 mA
Total Package Power Dissipation over the Full Operating Case
Temperature Range
*
3.25 Watts
Maximum Junction to Case Temperature
3.25C
Junction-Case, Thermal Resistance
1C/W
*
See Aeroflex Application Note # 112 for reference.
ELECTRICAL CHARACTERISTICS TRANSMITTER SECTION
1/ 2/
INPUT CHARACTERISTICS, TX DATA IN OR TX DATA IN
Parameter
Condition
Symbol
Min
Typ
Max
Unit
"0" Input Current
V
IN
= 0.4 V
I
ILD
-
-0.2
-0.4
mA
"1" Input Current
V
IN
= 2.7 V
I
IHD
-
1.0
40
A
"0" Input Voltage
-
V
IHD
-
-
0.7
V
"1" Input Voltage
-
V
IHD
2.0
-
-
V
INHIBIT CHARACTERISTICS
"0" Input Current
V
IN
= 0.4 V
I
ILI
-
-0.2
-0.4
mA
"1" Input Current
V
IN
= 2.7 V
I
IHI
-
1.0
40
A
"0" Input Voltage
-
V
ILI
-
-
0.7
V
"1" Input Voltage
-
V
IHI
2
-
-
V
Delay from TX inhibit(0
1) to inhibited output
-
t
DXOFF
-
300
500
nS
Delay from TX inhibit, (1
0) to active output
-
t
DXON
-
300
500
nS
Differential output noise, inhibit mode
3/
V
NOI
-
0.8
10
mVp-p
Differential output impedance
*
4/
Z
OI
2K
-
-
*
See Aeroflex Application Note # 113 for reference.
OUTPUT CHARACTERISTICS
Differential output - Direct coupled stub
(See Figure 3 or 4)
Pt. B - B'
Z
O
=
70
-85
5/
V
O
26
29
32
Vp-p
Differential output offset - Direct coupled stub
Figure 3 or 4
V
OS
-
-
360
mVpk
Differential output rise / fall times (See Figure 5)
10% - 90%
t
R
& t
F
200
250
300
nS
Delay from 50% point of TX DATA or TX DATA input
to zero crossing of differential output.
-
t
DTX
280
350
nS
4
SCD4444 Rev B
ELECTRICAL CHARACTERISTICS RECEIVER SECTION
1/ 2/
Parameter
Condition
Symbol
Min
Typ
Max
Unit
Differential Input Impedance
f = 1MHz
Z
IN
10K
-
-
Differential Input Voltage Range
-
V
IDR
-
-
40 Vp-p
Input Common Mode Voltage Range
-
V
ICR
10
-
-
Vp-p
Common Mode Rejection Ratio
-
CMRR
40
-
-
dB
STROBE CHARACTERISTICS (LOGIC "0" INHIBITS OUTPUT)
"0" Input Current
V
S
= 0.4 V
I
IL
-
-0.2
-0.4
mA
"1" Input Current
V
S
= 2.7 V
I
IH
-
1.0
+40
A
"0" Input Voltage
-
V
IL
-
-
0.7
V
"1" Input Voltage
-
V
IH
2.0
-
-
V
Strobe Delay (Turn-on or Turn-off)
-
t
SD
-
-
250
nS
THRESHOLD CHARACTERISTICS (SINEWAVE INPUT )
Internal Threshold Voltage
(See Figure 3 or 4)
Pt. B - B'
1MHz
V
TH
0.60
0.80
1.10
Vp-p
OUTPUT CHARACTERISTICS, RX DATA AND RX DATA
"1" State
I
OH
= -0.4 mA
V
OH
2.5
3.6
-
V
"0" State
I
OL
= 4 mA
V
OL
-
0.35
0.5
V
Delay (average), from differential input zero
crossings to RX DATA and RX DATA output
50% points
6/
t
DRX
-
300
500
nS
POWER SUPPLY CURRENT
1/ 2/
Duty Cycle
Condition
Symbol
Typ
Max
Unit
Transmitter
Standby
Pt. B - B', Z
O
= 70
,
V
O
= 29 V
PK
-
PK
Bit Pattern = FFFF
HEX
Figure 3 or 4
I
CC
I
EE
I
L
5
25
18
10
35
30
mA
25%
I
CC
I
EE
I
L
20
40
18
30
60
30
50%
I
CC
I
EE
I
L
40
60
18
60
80
30
100%
I
CC
I
EE
I
L
85
105
18
120
140
25
5
SCD4444 Rev B
TYPICAL HYBRID POWER DISSIPATION
*
Power Supply
Conditions
Condition
Standby
100% Duty
Cycle
Unit
PSC1
V
CC
= +15V
V
EE
= -15V
V
L
= +5V
Pt. B - B', Z
O
= 70
,
V
O
= 29 V
PK
-
PK
Bit Pattern = FFFF
HEX
Figure 3 or 4
0.540
2.167
Watts
PSC2
V
CC
= +15V
V
EE
= -12V
V
L
= +5V
0.465
1.852
PSC3
V
CC
= +12V
V
EE
= -12V
V
L
= +5V
0.450
1.600
*
See Aeroflex Application note# 112 for reference.
RECOMMENDED POWER SUPPLY VOLTAGE RANGE
V
CC
+11.4 Volts to +15.75 Volts
V
EE
-11.4 Volts to -15.75 Volts
V
L
+4.5 Volts to +5.5 Volts
Notes:
1. V
CC
= +15Volts 0.75V, V
EE
= -15Volts 0.75V, V
IL
= +5Volts 0.5V, T
C
= -40C to +85C, unless otherwise specified.
2. All typical values are measured at +25C.
3. Characteristics guaranteed by design, not production tested.
4. Power ON/OFF, measured from 75KHz to 1MHz at Point A-A' Figure 3 or 4, in accordance with MIL-STD-1553B paragraph
4.5.2.2.2.3.
5. At point A-A' on Figure 3 or 4, 2.5S after midpoint crossing of the parity bit of the last word of a 660 S message.
6. This test is peformed while the Transceiver is reading its own transmission. This condition is called "Wraparound". Standard TTL
loads applied to RX DATA Outputs.
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