Integrated T1/E1/J1 Short-Haul and

Long-Haul Protection Switch

______________________________________________________________________________________

11

tr < 5ns

tf < 5ns

50%

LOGIC

INPUT

50

Ω

COM_

GND

IN_

(

)

0V

NO_

OR NC_

OR

0.9

0.9

SWITCH

OUTPUT

LOGIC

INPUT

LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES

THAT HAVE THE OPPOSITE LOGIC SENSE.

V+

35pF

MAX4670

0.1

µF

V+

Figure 2. Switching Time

50%

LOGIC

INPUT

0.9

LOGIC

INPUT

50

Ω

GND

NO_

IN_

NC_

V+

35pF

OR

COM_

MAX4670

0.1

µF

V+

Figure 3. Break-Before-Make Intervals

Test Circuits/Timing Diagrams

IN_

OFF

ON

OFF

Q = (

IN DEPENDS ON SWITCH CONFIGURATION;

INPUT POLARITY DETERMINED BY SENSE OF SWITCH.

OFF

ON

OFF

IN_

MAX4670

GND

COM_

V+

NC_

OR NO_

IN_

0.1

µF

V+

Figure 4. Charge Injection