2

SCD4404N Rev D 12/19/07

Aeroflex Plainview

FIGURE 1 – TRANSMITTER LOGIC WAVEFORMS IDEALIZED

FIGURE 2 – RECEIVER LOGIC WAVEFORMS IDEALIZED

DATA IN

DATA IN

INHIBIT

LINE TO LINE

OUTPUT

Notes:

2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them.

3. DATA and DATA must be in the same state during off time (both high or low).

1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal.

Note overlap

LINE TO LINE

INPUT

DATA OUT

DATA OUT

1. Normally high output in standby.

Notes:

(Shown for normally high only)

TRANSMIT

OUTPUT

STAGE

COMP.

COMP.

INPUT

AMP

DRIVER

TX DATA IN

TX DATA IN

TX INHIBIT

+5 V

RX DATA IN

RX DATA IN

STROBE

TX DATA OUT

TX DATA OUT

RX DATA OUT

RX DATA OUT

-12V or -15V

EXT. THRESHOLD

DATA

SET INTERNAL

DATA

DATA

EXT. THRESHOLD

DATA

+15V or +12V

V+

V-

THRESHOLD

GND

CASE GND

ACTIVE

FILTER

FILTER

RECEIVE

ACTIVE

FILTER

BLOCK DIAGRAM (WITHOUT TRANSFORMER