MH88612B
Current Limit
Data Sheet
The Tip or Ring of the telephone line may accidentally be shorted to ground. In such a case, current will only flow
through the feed resistor. This high current will be sensed and reduced by the current limit circuit to a lower value to
protect the internal circuitry.
Power Denial
The power denial function is a feature of the MH88612B which allows for powering down of the subscriber loop. A
logic high voltage applied to the power denial input effectively removes the battery voltage from the loop driver
circuitry. The resulting I
LOOP
is negligible and power consumption is minimized. The power denial function is useful
for disabling a loop which may have a ground fault.
4
SEMICMF.019
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
