ACT ACT4460, ACT4454 Datasheet
Features
ACT 4454 / 4460 Single Supply Transceivers
for MIL-STD-1553A/B &
MacAir A3818, A4905, A5232 & A5690
• Single 5 Volt Supply Operation
• Low Power Dissipation
• Small Size & Light Weight
• Dual Transceivers Save Space & Cost
• Outstanding MIL-STD-1553A/B and MacAir A3818, A4905,
A5232, A5690 Performance
• Processed and Screened to Mil-STD-883 Specs
• Radiation Hard Dielectric Isolation Monolithic Construction
for Severe Space Environments
• Superior High Frequency Line Transient and Input Ripple
Rejection
• Input and Output TTL Compatible Desig n
• DESC SMD# 5962-92061
TX DATA IN
TX DATA IN
TX INHIBIT
+5 V
+5V RTN
RX DATA IN
RX DATA IN
STROBE
DRIVER
INPUT
AMPLIFIER
Case Styl e
ACT 4454FP
Actual Size
REFERENCE
ACTIVE
FILTER
ACTIVE
FILTER
OUTPUT
STAGE
COMP.
COMP.
TX DATA OUT
TX DATA OUT
RX DATA OUT
RX DATA OUT
Block Diagram (without Transformer)
CIRCUIT TECHNOLOGY
www.aeroflex.com
General Description
The Aeroflex Circuit Technology
ACT4454 / 4460 series are next
generation monolithic transceiver
designs which provides full
compliance with MIL-STD-1553A/B
and MacAir A3818, A56 90, A5232 &
A4905 requirements in the smallest
packages with low power
consumption and single power supply
operation.
The ACT4454 / 4460 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 and A-5690.
Design of these transceivers
reflects particular attention to active
filter per formance. This results in low
bit and word error rate with super ior
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
eroflex Circuit T
echnology
– Data Bus Modules For The Future © SCD4454 REV A 3/17/99
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 7.0 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 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 transfor mer 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 Vol ts is recommended
Figure 1 — Transmitter Logic Waveforms Idealized
DATA IN
IN
DATA
INHIBIT
LINE TO LINE
OUTPUT
Note
:
DATA and DATA
and must be in the same state during off times (both hi gh or low) .
inputs must be complementary w avef orms or 50% duty cycle average , with no delays between them ,
Figure 2 — Receiver Logic Waveforms Idealized*
*
LINE TO LINE
INPUT
STROBE
DATA OUT
DATA OUT
* See Figure 7 For Actual Waveforms
Aeroflex Circuit Technology SCD4454 REV A 3/17/99 Plainview NY (516) 694-6700
2
Note overlap
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 800 mA
Total package power dissipation over the full operating
case temperat ur e rise
(Note: Normal operation conditions require
one transceiver on and the other off.)
2 Wa t ts
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 I
"1" Input Current V
= 2.7 V I
IN
"0" Input Voltage V
"1" Input Voltage V
Inhibit Characteristics
"0" Input Current VIN=0.4V
"1" Input Current
=2.7V I
V
IN
"0" Input Voltage V
"1" Input Voltage V
Delay from TX inhibit, (0→1) to inhibited output t
Delay from TX inhibit, (1→0) to active output t
Differential output noise, inhibit mode
Differential output impedance (inhibited)
Note 1
Output Characteristics
Differential output level
R
L
=35 Ω
I
ILI
DXOFF
DXON
V
Z
V
O
ILD
IHD
ILD
IHD
IHI
ILI
IHI
NOI
OI
-0.2 -0.4
mA
140 µA
0.7
2.0 V
-0.2 -0.4
1.0 40
mA
µA
0.7
2.0
250 450
150 450
210
nS
nS
mV
2K
6.3 7.0 7.7 V
P-P
V
V
V
P-P
Ω
Rise and fall times(10% to 90% of P-P output)
t
r
200 250 300 nS
Output offset at point A-A' on Figure 5, 2.5µS
R
after midpoint crossing of the parity bit of the
=35 Ω V
L
OS
± 90
mV peak
last word of a 660µS message
Delay from 50% point of TX DATA or TX DATA
input to zero crossing of differential signal
t
DTX
290 400
nS
Note 1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3K
minimum
Aeroflex Circuit Technology SCD4454 REV A 3/17/99 Plainv iew NY (516) 694-6700
3
Ω
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