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ACT4433-DF

DUAL TRANSCEIVER FOR MIL-STD-1553/1760

Aeroflex Corporation 

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.

Figure 1 — Transmitter Logic Waveforms Idealized

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 2 — Receiver Logic Waveforms Idealized (ACT 4433D)

LINE TO LINE

INPUT

STROBE

DATA OUT

DATA OUT

Aeroflex Circuit Technology

Note overlap

2

SCD4433D REV B 1/30/98 Plainview NY (516)694-6700

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