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ACT4487-D

DUAL TRANSCEIVER FOR MIL-STD-1553/1760

Aeroflex Corporation 

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.

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 (ACT4487D)

LINE TO LINE

INPUT

STROBE

DATA OUT

DATA OUT

Aeroflex Circuit Technology

Note overlap

2

SCD4487D REV B 3/10/98 Plainview NY (516) 694-6700

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