2

SCD4444 Rev B

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).

FIGURE 1 - TRANSMITTER LOGIC WAVEFORMS

FIGURE 2 - RECEIVER LOGIC WAVEFORMS

Note overlap

LINE TO LINE

INPUT

DATA OUT

DATA OUT

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

NORMALLY HIGH OR LOW OUTPUT IN STANDBY (SEE FIGURE 3 OR 4)

SHAPING

OUTPUT

STAGE

COMP.

COMP.

ACTIVE

FILTER

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

BLOCK DIAGRAM (WITHOUT TRANSFORMER)