ACT4454 Aeroflex Circuit Technology, ACT4454 Datasheet - Page 2

• Manufacturer Part Number: ACT4454
• Description: Act 4454 / 4460 Single Supply Transceivers For Mil-std-1553a/b & MacaIR A3818, A4905, A5232 & A5690
• Manufacturer: Aeroflex Circuit Technology

Aeroflex Circuit Technology
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
provides for the removal of the
transmitter output from the line. A
logic “1” applied to the “INHIBIT”
LINE TO LINE
DATA IN
DATA IN
INHIBIT
LINE TO LINE
STROBE
DATA OUT
DATA OUT
INPUT
OUTPUT
* See Figure 7 For Actual Waveforms
Figure 1 — Transmitter Logic Waveforms Idealized
Figure 2 — Receiver Logic Waveforms Idealized
overriding
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).
“INHIBIT
input
takes priority over the condition of
the data inputs and disables the
transmitter. (See Transmitter Logic
Waveform,
Transmitter may be safely operated
for an indefinite period with the bus
(point A-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
DATA, and represent positive and
The Receiver section accepts
*
Figure
2
*
1.)
Note overlap
The
and
negative excursions of the input
beyond
threshold.(See
Waveform. Figure 2.)
will
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.)
inhibits
outputs. If unused, a 2K pull-up to
+5 Volts is recommended
SCD4454 REV A 3/17/99 Plainview NY [phone]
The pre-set internal thresholds
A low level at the Strobe input
detect
the
a
data
DATA
Receiver
pre-determined
bus
and
signals
Logic
DATA