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www.aeroflex.com/act1.htm
ACT 4489 SINGLE TRANSCEIVER
FOR MIL-STD-1553/1760
Features
• +5 / ±12 Volt Supply Operation
• Low Power Dissipation
• Small Size & Light Weight
• Outstanding MIL-STD-1553 performance
• Radiation Hard Dielectric Isolation Monolithic
Construction for Severe Environments
• Superior High Frequency Line Transient and
Input Ripple Rejection
• Input and Output TTL Compatible Design
• Processed and Screened to MIL-STD-883 Specs
• MIL-PRF-38534 Compliant Devices Available
CIRCUIT TECHNOLOGY
General Description
The Aeroflex Circuit
Technology ACT 4489 is a next
generation monolithic transceiver
design which provides full
compliance to MIL-STD-1553A/B
and 1760 requirements in a small
package with low power
consumption.
The ACT4489 series 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.
Transmitter:
TX DATA IN
TX DATA
TX INHIBIT IN
+5V (VL)
+12V (VCC)
-12V (VEE)
GND1
GND2
GND3
RX DATA
RX DATA IN
CASE
RX STROBE IN
IN
IN
DRIVER
INPUT
AMPLIFIER
ACTIVE
FILTER
REFERENCE
ACTIVE
FILTER
OUTPUT
STAGE
COMP.
COMP.
TX DATA OUT
TX DATA
OUT
OUT
RX DATA
RX DATA OUT
Block Diagram (Without Transformer)
The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
1:1 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 Volts P-P at point A (See
Figure5). 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
eroflex Circuit Technology – Data Bus Modules For The Future © SCD4489 REV A 1/29/98
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for the removal of the transmitter
Note overlap
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, Figure1). The
Transmitter may be safely operated
for an indefinite period with the 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
Figure 1 — Transmitter Logic Waveforms Idealized
DATA IN
DATA IN
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.
INHIBIT
LINE TO LINE
OUTPUT
Note:
DATA and DATA
and must be in the same state during off times (both high or low).
inputs must be complementary waveforms or 50% duty cycle average, with no delays between them,
Figure 2 — Receiver Logic Waveforms Idealized (ACT4489)
LINE TO LINE
INPUT
STROBE
DATA OUT
DATA OUT
Aeroflex Circuit Technology SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
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Absolute Maximum Ratings
Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +150°C
Power supply voltage
CC
V
VEE
VL
-0.3 V to +18 V
+0.3 V to-18 V
-0.3 V to +7.0 V
Logic input voltage -0.3 V to +5.5 V
Receiver differential input ±40 V
Receiver input voltage (common mode) ±10 V
Driver peak output current 300 mA
Total package power dissipation over the full operating
2.5 Watts
case temperature rise
Maximum junction to case temperature 10°C
Thermal resistance – junction to case 4°C/W
Electrical Characteristics — Driver Section
Input Characteristics, TX DATA IN or TX DATA IN (Notes 2 & 3 apply)
P-P
Parameter Condition Symbol Min Typ
"0" Input Current VIN = 0.4 V I
"1" Input Current V
= 2.7 V I
IN
"0" Input Voltage V
"1" Input Voltage V
ILD
IHD
IHD
IHD
2.0 V
-0.1 -0.2
Inhibit Characteristics
"0" Input Current
"1" Input Current
"0" Input Voltage
"1" Input Voltage
Delay from TX inhibit, (0→1) to inhibited output From mid pt
Delay from TX inhibit, (1→0) to active output
Differential output noise, inhibit mode
Differential output impedance (inhibited) Note 1
See Figure 5
= 0.4 V I
V
IN
=2.7V I
V
IN
inhibit to
±1.2V pt B,
See Figure 5
Point B
Point C
ILI
IHI
V
ILI
V
IHI
t
DXOFF
t
DXON
V
NOI
Z
OI
Z
OI
-0.1 -0.2
1.0 40
2.0
175 225
90 150
2K
1K
Ma
x
Unit
mA
1 40 µA
0.7
mA
µA
0.7
V
V
nS
nS
2 10 mV
Ω
Ω
V
P-P
Output Characteristics
Differential output level,
See Figure 5
Rise and fall times(10% to 90% at pt A output)
See Figure 5
Output offset, Figure 3, 2.5µS after midpoint
crossing of the parity bit of the last word of a 660µS
Point A V
Point A
Point A
V
t
OS
O
r
6 7 9
100 160 300 nS
± 90
message See Figure 5
Delay from 50% point of TX DATA or TX DATA
to zero crossing of differential signal. See Fig 5
Aeroflex Circuit Technology SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
input
Point A t
3
DXT
100 200
V
mV peak
nS
P-P
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Electrical Characteristics — Receiver Section
Parameter Condition Symbol Min Typ Max Unit
Differential Receiver Input Voltage Range
(See Figure 5, Point B)
TXFMR
1:1
V
Common Mode Rejection Ratio (Note 3) CMRR
"1" State – Rx Data or Rx Data
"0" State – Rx Data or Rx Data
Output IOH = -0.4 mA
Output IOI = 4 mA
V
V
Delay (average) from Differential Input Zero
Crossings to RX DATA and RX DATA
Output
t
50% points
Input Threshold Voltage (referred to the bus)
100KHz–1MHz
V
Strobe Characteristics (Logic "0" Inhibits Output)
"0" Input Current VS=0.4V
"1" Input Current V
"0" Input Voltage
"1" Input Voltage V
Strobe Delay (Turn-on or Turn-off)
=2.7V
S
IDR
OH
OL
DXT
TH
I
IL
I
IH
V
t
SD
40
V
P-P
45 dB
2.5 3.7 V
0.35
0.5
V
270 400 nS
0.60
0.75
-0.1
IL
IH
2.0
50 100
1.20 V
-0.2
1 +40
0.7
P-P
mA
µA
V
V
nS
Power Data
Power Supply Currents – Per Channel – See Figure 4
I
CC
I
I
I
I
I
I
I
EE
I
L
CC
EE
I
L
CC
EE
I
L
CC
EE
I
L
Transmitter Standby
25% duty cycle
50% duty cycle
100% duty cycle
Power Supply Voltages
V
±12V Operating Power Supply Voltage Range
+5V
Operating Power Supply Voltage Range) V
CC
VEE
Note 1. Power on or off, measured from 75KHz to 1MHz at point A and transformer self impedance of 3KΩ minimum
at 1MHz.
Note 2. Power Supplies: ±12 Volts ±0.60 V & +5 Volts ±0.5 V, bypassed by 10µF (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 as shown per Figure 5 with ± 10 Volt peak, line to ground, DC to 2MHz
Note 4. Typical power is measured with V
at point A = 7 V
BUS
P-P
+11.40
-11.40
L +4.50 +5.00 +5.50
0
12
18
58
12
18
115
12
18
230
12
18
+12.00
-12.00
1
16
30
63
20
30
125
20
30
250
20
30
+12.60
-12.60
mA
V
V
Aeroflex Circuit Technology SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
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Figure 3 – Transmitter (TX) Output Offset
POWER DISSIPATION
MILLIWATTS
Figure 5 – Typical 1553 Bus Connections
LAST BIT
Magnified View
0 Volts
2.5 µsec
OUTPUT OFFSET*
OUTPUT OFFSET
*
*Offset measured at point A in Figure 5
Figure 4 – Hybrid Power Dissipation vs. Duty Cycle
3600
0.270
3200
2800
2400
2000
1600
1200
800
400
0
Typical Hybrid Input Power
Typical Hybrid
Dissipation
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE – PERCENT
3.0W
1.9W
Transformer Coupled Stub
ACT 4489
TX DATA OUT
TX DATA
OUT
RX DATA IN
RX DATA
IN
1 : 0.707
3
7
2
1
5
T1553-1
1 : 1.4
C
Zoi
VCM
Direct Coupled Stub
ACT 4489
TX DATA OUT
TX DATA
OUT
RX DATA IN
RX DATA
IN
Transformer Model use Technitrol Part# 1553-1
or equivalent
1 : 1
3
2
1
T1553-1
8
4
52.5Ω
B
52.5Ω
Zoi
52.5
52.5Ω
70Ω
Ω
A
A
70
Ω
Note: Vcc= +12V, VEE = -12V, VL= +5V, Transformer ratio 1:1,
(point A) at 7VP-P.
V
BUS
Configurations and Ordering Information
ACT
Model # / Ordering Part #
ACT 4489 Plug In TBA Normally Low
ACT 4489-I Plug In TBA Normally High
ACT 4489-F Flat Package TBA Normally Low
ACT 4489-FI Flat Package TBA Normally High
Specifications subject to change without notice.
Aeroflex Circuit Technology SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
Case
Style
5
DESC
Number
Rx Standby
Page 6
Figure 6 – Lead Numbers & Functions
ACT4489
Pin # Function
1 TX DATA OUT
2 TX DATA
3 GROUND
4 NC
5 NC
6 NC
7 RX DATA OUT
8 STROBE
9 GROUND
OUT
10 RX DATA
OUT
11 NC
12 NC
13 V
CC
14 NC
15 RX DATA IN
16 RX DATA
IN
17 NC
18 CASE
19 V
EE
20 +5 V
21 TX INHIBIT
22 TX DATA IN
23 TX DATA
IN
24 NC
Aeroflex Circuit Technology SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
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CIRCUIT TECHNOLOGY
Plug In Package Outline
1.385 MAX.
1324
Pin 1 & ESD
Designator
.240
MIN.
.100
12
.015
.018
1.100
(11 Equal Spaces at .100)
Flat Package Outline
1.315 MAX.
.015
1324
0.805
MAX.
0.200
MAX.
.200
MAX.
.065
0.600
0.735
.375
MIN.
MAX.
.100
12
.010
1.100
(11 Equal Spaces at .100)
Telephone: (516) 694-6700
FAX: (516) 694-6715
Toll Free Inquiries: (800) THE-1553
E-Mail: sales-act@aeroflex.com
7
Lead 1 & ESD
Designator
Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11830
www.aeroflex.com/act1.htm
Aeroflex Circuit Technology SCD4489 Rev A 1/29/98 Plainview NY (516) 694-6700
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