le9531cmqc Zarlink Semiconductor, le9531cmqc Datasheet - Page 21

• Manufacturer Part Number: le9531cmqc
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

Active—Reverse Battery—High DC Current Limit
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Disconnect
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Ringing
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Ground Start
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Thermal Shutdown
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Pin PR is positive with respect to PT.
DC loop current limit is 40 mA.
Loop closure detector is active.
Ring trip detector is turned off to conserve power.
On-hook transmission is allowed.
The tip to ring on-hook differential voltage will be typically between –41 V and –49 V with a –51 V to –100 V
primary battery.
Supports undistorted transmission of 3.14 dBm into 900 ohms with 500 mVrms of PPM for any supported
loop length and on-hook transmission
The tip/ring amplifiers and all supervision are turned off.
The SLIC device goes into a high-impedance state.
NSTAT is forced high (on-hook).
Power ring signal is applied to tip and ring.
Input wave form at RINGP/N is amplified with a high gain.
Ring trip supervision is active; loop closure is inactive.
Overhead voltage is reduced to typically 2.4 V.
Tip drive amplifier is turned off.
Device presents a high impedance (>100 k) to pin PT.
Device presents amplitude clamped (<56.5 V) current-limited battery (V
Ground Start detector is active, threshold adjusted for common mode current
Not controlled via truth table inputs.
This mode is caused by excessive heating of the device, such as may be encountered in an extended power
cross situation. NSTAT output is forced low or off-hook during a thermal shutdown event.
Zarlink Semiconductor Inc.
Le9531
21
BAT
) to PR.
Data Sheet