ACT4487 Aeroflex Circuit Technology, ACT4487 Datasheet - Page 2

• Manufacturer Part Number: ACT4487
• Description: Act 4487 Dual Transceiver For Mil-std-1553/1760
• Manufacturer: Aeroflex Circuit Technology

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,
becomes a high impedance and is
“removed” from the line. In addition,
an
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
Aeroflex Circuit Technology
LINE TO LINE
DATA IN
DATA IN
INHIBIT
LINE TO LINE
DATA OUT
DATA OUT
INPUT
STROBE
OUTPUT
Figure 1 — Transmitter Logic Waveforms Idealized
Figure 2 — Receiver Logic Waveforms Idealized (ACT4487D)
overriding
the
Note: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them,
the
and must be in the same state during off times (both high or low).
transmitter
transmitter
“INHIBIT"
output
input
(See
Transmitter
Figure 1). The Transmitter may be
safely operated for an indefinite
period with the bus (point A) short
circuited at 100% duty cycle.
Receiver:
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,
The Receiver section accepts
Logic
2
Waveform,
Note overlap
SCD4487D REV B 3/10/98 Plainview NY [phone]
Figure 2).
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).
input inhibits the DATA
DATA outputs. If unused, a 2K
pull-up
recommended.
The pre-set internal thresholds
A low level at the RX Strobe
to
+5
Volts
and
is