CIRCUIT TECHNOLOGY
www.aeroflex.com
EROFLEX CIRCUIT TECHNOLOGY - Data Bus Modules for the Future ©SCD4077 REV A 3/25/03
ACT4077FP
USA-88379
AEROFLEX
ACT4077
USA-88379
AEROFLEX
Features
• ACT4077 Driver meets MIL-STD-1553A & B, Macair A3818, A4905,
A5232 and A5690 specs
• Bipolar Supply ±15V to ±12V, Logic Supply +5V
• Direct replacement for CT2077 and CT3077
• Voltage source output for higher bus drive power
• Plug-in, flat package or low profile flat package
• Monolithic construction using linear ASICs
• Processed and screened to MIL-STD-883 specs
• MIL-PRF-38534 Compliant Devices Available
ACT4077 Driver
Block Diagram (without Transformer)
TX DATA IN
TX DATA OUT
DRIVER SHAPING OUTPUT
STAGE
TX DATA IN
TX DATA OUT
TX INHIBIT
ACT4077 Driver for
MACAIR A3818, A5690, A5232, A4905
& MIL-STD-1553
Aeroflex Circuit Technology SCD4077 REV A 3/25/03 Plainview NY (516) 694-6700
2
The Aeroflex Laboratories driver ACT4077
are new generation monolithic Drivers which
provide full compliance with Macair and
MIL-STD-1553 data bus requirements
The ACT4077 performs the front-end analog
function of inputting and outputting data
through a transformer to a MIL-STD-1553 or
Macair data bus. The ACT4077 can be
considered a "Universal" Driver in that it is
compatible with MIL-STD-1553A, B, Macair
A-3818, A-4905, A-5232 and A-5690.
Design of the Driver 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 ACT4077 series
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 Driver electrical and thermal design
provides low internal power dissipation and
heat rise at high and well as low duty cycles.
The Driver 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 52.5 Ohm fault isolation
resistors, and loaded by two 70 Ohm
terminations plus additional receivers, the data
bus signal produced is 7.0 Volts minimum P-P
at A-A’. (See Figure 4.) When both DATA and
DATA inputs are held low or high, the Driver
output becomes a high impedance and is
“removed” from the line. In addition, an
overriding “INHIBIT" input provides for the
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 1)
The Driver utilizes an active filter to suppress
harmonics above 1 MHz to meet Macair
specifications A-3818, A-4905, A-5232 and
A-5690. The Driver may be safely operated for
an indefinite period at 100% duty cycle into a
data bus short circuit.
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 - Driver Logic Waveforms
1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal
General Description
Aeroflex Circuit Technology SCD4077 REV A
3/25/03
Plainview NY (516) 694-6700
3
Absolute Maximum Ratings
Operating case temperature -55°C to +125°C
Storage Case Temperature -65°C to +150°C
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 300 mA
Total Package Power Dissipation over the Full
Operating Case Temperature Range 3.6 Watts
Maximum Junction to Case Temperature 18°C
Junction-Case, Thermal Resistance 5°C/W
Electrical Characteristics, Driver Section
Input Characteristics, TX DATA IN or TX DATA IN
Parameter Condition Symbol Min Typ Max Unit
"0" Input Current VIN = 0.4 V IILD --0.2 -0.4 mA
"1" Input Current VIN = 2.7 V IIHD -1.0 40 µA
"0" Input Voltage VIHD --0.7 V
"1" Input Voltage VIHD 2.0 - - V
Inhibit Characteristics
"0" Input Current VIN = 0.4 V IILI --0.2 -0.4 mA
"1" Input Current VIN = 2.7 V IIHI -1.040 µA
"0" Input Voltage VILI --0.7 V
"1" Input Voltage VIHI 2- - V
Delay from TX inhibit(0→1) to inhibited output Note 1 tDXOFF - 300 450 nS
Delay from TX inhibit, (1→0) to active output Note 1 tDXON - 300 450 nS
Differential output noise, inhibit mode VNOI -0.810mVp-p
Differential output impedance (inhibited) Note 2 ZOI 2K - - Ω
Output Characteristics
Differential output level RL = 35 Ω V
O77.59 Vp-p
Rise and fall times
(10% to 90% of p-p output) tR & tF200 250 300 nS
Output offset at point A-A’ on Fig 5., 2.5 µS
after midpoint crossing of the parity bit of the
last word of a 660 µS message
RL = 35 Ω V
OS ±90 mVpeak
Delay from 50% point of TX DATA or
TX DATA input to zero crossing of
differential signal. (Note 1)
tDTX 240 300 nS
Aeroflex Circuit Technology SCD4077 REV A
3/25/03
Plainview NY (516) 694-6700
4
Power Data
Power Supply Currents (Power Supplies set at +15V, -15V, +5V)
Parameter Condition Symbol Min Typ Max Unit
Driver Standby
ICC
IEE
IL
15
27
13
30
50
20
mA
25% duty cycle
ICC
IEE
IL
34
50
14
50
80
20
50% duty cycle
ICC
IEE
IL
50
70
14
80
100
20
100% duty cycle
ICC
IEE
IL
110
120
13
140
150
20
Recommended Power Supply Voltage Range
+V +11.4 Volts to +15.75 Volts
-V -11.4 Volts to -15.75 Volts
Logic +4.5 Volts to +5.5 Volts
Aeroflex Circuit Technology SCD4077 REV A
3/25/03
Plainview NY (516) 694-6700
5
Notes:
1. Characteristics guaranteed by design, not production tested.
2. Measured from 75KHz to 1MHz at point A-A’, power on or off.
3. Specifications apply over the temperature range of -55°C to +125°C (case temperature)
unless otherwise noted.
4. All typical values are measured at +25°C
The information contained in this data sheet is believed to be accurate; however, Aeroflex Circuit
Technology. assumes no responsibility for its use, and no licence or rights are granted by
implication or otherwise in connection therewith.
Figure 2 - Driver (TX) Output Wave form Figure 3 - Driver (TX) Output offset
Figure 4 - Typical Transformer connection Figure 5 - Power Dissipation vs. Duty Cycle
0 10 20 30 40 50 60 70 80 90 100
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
DUTY CYCLE, PERCENT
POWER DISSIPATION
WATTS
6.5V P-P MIN
8.5V P-P MAX
90%
10%
tr*
tf*
* Rise and fall times measured at point A-A’ in Fig 5
0 Volts
OUTPUT OFFSET*
OUTPUT OFFSET*
Last Bit
2.5 µsec
*Offset measured at point A-A’ in Fig 5
N1:N2
A
A’
B’
B
TX DATA OUT
TX DATA OUT
70Ω70Ω
52.5Ω
52.5Ω
Ctr
tap
Transformer turns ratios:
N1:N2 = 1:1
N1:N3 = 1:0.71
Use Aeroflex 25T1553-1
N1:N3 for
stub
coupling
0 Volts
Magnified View
(TYPICAL)
Aeroflex Circuit Technology SCD4077 REV A
3/25/03
Plainview NY (516) 694-6700
6
Ordering Information
Model No. Case
ACT4077 Plug In
ACT4077-FP Flat Pack
1.27
MAX
24 13
12
FLAT PACKAGE
1.10
MAX
0.24
MIN
0.018 DIA.
±0.002
0.100 Typ
±0.003
1.255 MAX
0.072 ±0.012
0.010
±0.002
Notes 1. Dimensions shown are in inches
2. Pins are equally spaced at 0.100±0.002 tolerance non-cumulative each row.
1.27 MAX
1.10
1.255 MAX
0.015
0.500
MIN 2 sides
PLUG-IN PACKAGE
0.100 0.175 MAX
0.175
Pin 1 & ESD
Designator
Pin 1 & ESD
Designator
CIRCUIT TECHNOLOGY
Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11803
Telephone: (516) 694-6700
FAX: (516) 694-6715
Toll Free Inquiries: (800) 843-1553
Specifications subject to change without notice
www.aeroflex.com E-Mail: sales-act@aeroflex.com
Pin #’s & Functions
1 +15V (TX)
2NC
3TX DATA
IN
4 TX GND (+5V)
5 TX INHIBIT
6+5V
7 TX DATA IN
8NC
9 CASE GND
10 GND
11 NC
12 -15V (TX)
13 NC
14 NC
15 NC
16 TX DATA OUT
17 NC
18 NC
19 NC
20 NC
21 TX DATA OUT
22 NC
23 NC
24 NC
