MH88634CV-K
Data Sheet
output switches to a logic 0 after 50 ms of applied ringing voltage and remains at a logic 0 for 50 ms after ringing
voltage is removed.
RV shall not toggle during ringing.
Forward Loop and Reverse Loop Detect Outputs (FL & RL)
The FL output provides a logic 0 when either forward loop battery or forward loop current is detected, that is the
Ring pin voltage is more negative than the Tip pin voltage.
The RL output provides a logic 0 when either reverse loop battery or reverse loop current is detected, that is the Tip
pin voltage is more negative than the Ring pin voltage.
Switch Hook (SHK)
The
SHK
output is active if either forward loop or reverse loop current is detected, or if forward or reverse battery
voltage is detected.
Control Input
The MH88634CV-K accepts a control signal from the system controller at the Loop Relay Control input (LRC). This
energizes the relay drive output Loop Relay Drive (LRD). The output is active low and has an internal clamp diode
to VRLY.
The intended use of this relay driver is to add and remove the Line Termination from across Tip and Ring, as shown
in Figure 3.
If this Control input and the Supervisory Features are used as indicated in Figure 3, Loop-Start Signalling can be
implemented.
Mechanical Data
See Figure 9 for details of the mechanical specification.
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Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
