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5962-92061-08

ACT 4487 DUAL TRANSCEIVER FOR MIL-STD-1553/1760

Aeroflex Corporation 

two 70 Ohm terminations, the data

bus signal is typically 7.5 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 overriding “INHIBIT input

provides for the removal of the

transmitter output from the line. A

logic “1” 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-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 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 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*

LINE TO LINE

INPUT

STROBE

DATA OUT

DATA OUT

* See Figure 8 For Actual Waveforms

Aeroflex Circuit Technology

Note overlap

2

SCD4458 REV A 1/29/98 Plainview NY (516) 694-6700

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