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ACT4487 Datasheet(PDF) 2 Page - Aeroflex Circuit Technology

Part # ACT4487
Description  ACT 4487 DUAL TRANSCEIVER FOR MIL-STD-1553/1760
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Manufacturer  AEROFLEX [Aeroflex Circuit Technology]
Direct Link  http://www.aeroflex.com
Logo AEROFLEX - Aeroflex Circuit Technology

ACT4487 Datasheet(HTML) 2 Page - Aeroflex Circuit Technology

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Aeroflex Circuit Technology
SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700
2
terminations, the data bus signal is
typically 7.5 Volts P-P at point 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”
signal
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) 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
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.
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 (ACT4487D)
Note overlap
LINE TO LINE
INPUT
DATA OUT
DATA OUT
STROBE


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