eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCD4455 REV A 1/29/98
CIRCUIT TECHNOLOGY
www.aeroflex.com/act1.htm
Features
• Single 5 Volt Supply Operation
• Low Power Dissipation
• Small Size & Light Weight
• Single Transceiver Save Space & Cost
• Outstanding MIL-STD-1553 performance
• Processed and Screened to Mil-STD-883
Specs
• Radiation Hard Dielectric Isolation
Monolithic construction for Severe
Environments
• Superior High Frequency Line Transient and
Input Ripple Rejection
• Input and Output TTL Compatible Design
• DESC SMD# 5962-96741
General Description:
The Aeroflex Circuit Technology
ACT4455 / 4459 series are next
generation monolithic transceiver
designs which provides full
compliance with MIL-STD-1553A/B
and 1760 requirements in the
smallest packages with low power
consumption and single power supply
operation.
The ACT4455 / 4459 series
performs the front-end analog
function of inputting and outputting
data through a transformer to the
MIL-STD-1553 data bus.
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.
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, isolated on
the data bus side with two 52.5 Ohm
fault isolation resistors, and loaded by
two 70 Ohm terminations, the data
bus signal is typically 7.5 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,
Block Diagram (without Transformer)
ACTIVE OUTPUT
STAGE
COMP.
COMP.
REFERENCE
ACTIVE
FILTER
INPUT
AMPLIFIER
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
FILTER
+5V RTN
ACT 4455 / 4459
SINGLE SUPPLY TRANSCEIVERS
FOR MIL-STD-1553/1760
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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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
Waveform, Figure 1.) 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 Receiver Logic
Waveform. Figure 2.)
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
connection.)
A low level at the Strobe input
inhibits the DATA and DATA
outputs. If unused, a 2K pull-up to
+5 Volts is recommended
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*
Figure 2 — Receiver Logic Waveforms Idealized*
Note overlap
LINE TO LINE
INPUT
DATA OUT
DATA OUT
STROBE
* See Figure 8 For Actual Waveforms
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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Note 1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3KΩ
minimum
Absolute Maximum Ratings
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +150°C
Power supply voltage -0.3 V to +7.0 V
Logic input voltage -0.3 V to +5.5 V
Receiver differential input ±10 V
Receiver input voltage (common mode) ±5 V
Driver peak output current 600 mA
Total package power dissipation over the full operating
case temperature rise 2 Watts
Maximum junction to case temperature 10°C
Thermal resistance – junction to case 5°C/W
Electrical Characteristics — Driver Section
Input Characteristics, TX DATA in or TX DATA in (Notes 2 & 3 apply)
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 40 µA
"0" Input Voltage VILD 0.7 V
"1" Input Voltage VIHD 2.0 V
Inhibit Characteristics
"0" Input Current VIN=0.4V IILI -0.2 -0.4 mA
"1" Input Current VIN=2.7V IIHI 1.0 40 µA
"0" Input Voltage VILI 0.7 V
"1" Input Voltage VIHI 2.0 V
Delay from TX inhibit, (0→1) to inhibited output tDXOFF 250 350 nS
Delay from TX inhibit, (1→0) to active output tDXON 150 250 nS
Differential output noise, inhibit mode VNOI 210 mVP-P
Differential output impedance (inhibited) Note 1 ZOI 2K Ω
Output Characteristics
Differential output level RL=35 Ω VO67.5 9VP-P
Rise and fall times(10% to 90% of P-P output) tr100 200 300 nS
Output offset at point A-A' on Figure 5, 2.5µS
after midpoint crossing of the parity bit of the
last word of a 660µS message RL=35 Ω VOS ± 90 mV peak
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal tDTX 120 250 nS
(Note: Normal operation conditions require one transceiver on and the
other off.)
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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Note 2: Vcc = 5 Volts ±0.1 V, bypassed by 2.2µF (Tantalum recommended) Capacitor minimum. All measurements &
specifications apply over the temperature range of -55°C to +125°C (case temperature) unless otherwise
specified.
Note 3: When measured at point A-A’ with ± 10 Volt peak, line to ground, DC to 2MHz
Note 4: Typical power is measured with Vbus at point A-A’ = 7.5 VP-P
Electrical Characteristics — Receiver Section
Parameter Condition Symbol Min Typ Max Unit
Differential Receiver Input Voltage Range
(See Figure 5, point P–P') TXFMR
2.12:1 VIDR 14 20 VP-P
Common Mode Rejection Ratio (Note 3) CMRR 45 dB
Strobe Characteristics (Logic "O" Inhibits Output)
"0" Input Current VS=0.4 V IIL -0.2 -0.4 mA
"1" Input Current VS=2.7V IIH 1+40 µA
"0" Input Voltage VIL 0.7 V
"1" Input Voltage VIH 2.0 V
Strobe Delay (Turn-on or Turn-off) tSD 50 100 nS
Threshold Characteristics (Sinewave Input)
Input Threshold Voltage (referred to the bus) 100KHz–1MHz VTH 0.60 0.82 1.10 V P-P
Output Characteristics – RX DATA and RX DATA
"1" State IOH = -0.4 mA VOH 2.5 3.7 V
"0" State IOL = -4.0 mA VOL 0.35 0.5 V
Delay, (average) from Differential Input Zero
Crossings to RX DATA and RX DATA Output
50% points
tDRX 340 500 nS
Power Data
Power Supply Currents – Per Channel
Transmitter Standby
Note 4 ICC
18 30
mA
25% duty cycle 150 175
50% duty cycle 300 350
100% duty cycle 600 700
Power Supply Voltage
Operating Power Supply Voltage Range VCC +4.75 +5.00 +5.50 V
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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Figure 3 – Transmitter (TX) Output Wave form Figure 4 – Transmitter (TX) Output offset
Figure 5 – Typical direct transformer connection Figure 6 – Power Dissipation vs. Duty Cycle
0 10 20 30 40 50 60 70 80 90 100
1600
1400
1200
1000
800
600
400
200
0
DUTY CYCLE – PERCENT
POWER DISSIPATION
MILLIWATTS
6V P-P MIN
9V P-P MAX
90%
10%
tr*
tf*
* Rise and fall times measured at point A-A' in Figure 5
0 Volts
OUTPUT OFFSET*
OUTPUT OFFSET*
LAST BIT
2.5 µsec
*Offset measured at point A-A' in Figure 5
N1:N2
A
A'
B'
B
TX DATA OUT
TX DATA OUT
RX DATA IN
RX DATA IN
70Ω70Ω
52.5Ω
52.5Ω
Center
Tap
Transformer turns ratios:
N1:N2 = 1:2.5
N1:N3 = 1:1.77
Use Technitrol 1553-45 or equivalent
N1:N3 for
Stub
Coupling
0 volts
Magnified View
(Total hybrid with one channel transmitting
and the other not powered)
Note:Vcc=5 Volts,Transformer ratio 1:2.5, Vbus (pt A-A') at 7.5 Volts P-P
P
P'
1800
2000
Maximum
Typical
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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TX DATA IN
BUS OUT
RX DATA OUT
RX DATA OUT
Figure 8 ACTUAL HYBRID WAVEFORMS* — 25°C TYPICAL
START OF WORD – 33 WORD TRANSMISSION
Point A–A'
See Figure 5
CH 2
CH 1
CH 3
CH 4
END OF WORD – 33 WORD TRANSMISSION
TX DATA IN
BUS OUT
RX DATA OUT
RX DATA OUT
Point A–A'
See Figure 5
*
Oscilloscope used is a TEK TDS540 with Probe 6139A.
CH 2
CH 1
CH 3
CH 4
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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Figure 7 – Pin Numbers & Functions
ACT4455/4459
Pin # Function
1 TX DATA OUT
2 +5V
3 +5V
4 TX DATA OUT
5 TX DATA OUT
6 GROUND 1
7 NC
8 NC
9 +5V
10 RX DATA OUT
11 STROBE
12 NC
13 RX DATA OUT
14 NC
15 +5V
16 GROUND 3
17 NC
18 RX DATA IN
19 RX DATA IN
20 NC
21 NC
22 GROUND 4
23 +5V
24 INHIBIT
25 TX DATA IN
26 TX DATA IN
27 GROUND 2
28 TX DATA OUT
Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700
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Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11830
Telephone: (516) 694-6700
FAX: (516) 694-6715
Toll Free Inquiries: 1-(800)THE-1553
Specifications subject to change without notice.
CIRCUIT TECHNOLOGY
Configurations and Ordering Information
Model No. DESC No. Receiver Data level Case Configuration
ACT 4455 5962-96741 Normally Low Rx LCC Single
ACT 4459 5962-96741 Normally High Rx LCC Single
ACT4455/4459 LCC LEADLESS CHIP CARRIER
0.055
0.045
0.055
0.045
0.028
0.022
0.458
0.442
0.458
0.442
0.100
MAX
0.055
0.045
Notes
2. Pins are equally spaced at 0.100±0.002 tolerance,
non-cumulative, each row
