L9311 Full-Feature SLIC with High Longitudinal Balance,
Ringing Relay, and GR-909 Test Access
Data Sheet
July 2001
Features
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SLIC, solid-state ring relay, and line test access, inte-
grated into a single package
5 V and battery operation
User-defined power control options:
— Automatic battery switch
— Power control resistor
— Package thermal capabilities
Minimal external components required
Operating states:
— Forward active
— Reverse active (controlled rate of reversal)
— Scan
— Ground start (tip open)
— All-off or disconnect
— Ring
— Line test modes (dc/ac line voltage/current)
Ultralow power:
— Scan, 15 mW
— Active states, on-hook, 75 mW
— Ring mode, on-hook, 90 mW
— Disconnect, 10 mW
Adjustable overhead voltage:
— Default overhead adequate for 3.14 dB into
900
Ω
overload
— Controlled rate of overhead adjustment
Latched parallel input data interface with reset
Interrupt (unlatched) based loop status monitor
Adjustable current limiter:
— 10 mA to 45 mA programming range
Adjustable loop closure detector with hysteresis:
— 4 mA detect, 2.5 mA no detect minimum, upper
limit of 15 mA detect
— Hysteresis, typical 20% of programmed on-hook
to off-hook threshold
Ring trip detector:
— Single-pole filtering
Thermal shutdown protection with hysteresis
Line break switch will foldover into a low-current
state under high-voltage fault conditions
Battery out-of-range monitor circuit:
— All-off upon loss of battery (low battery condition)
— All-off upon high battery (fault condition)
Longitudinal balance:
— TR-57 balance
Ground start:
— Tip open state
— Ring ground detector
Line test:
— Line test modes (ac or dc):
1. Voltage tip to ground
2. Voltage ring to ground
3. Voltage tip to ring
4. Current tip to ring
5. Current tip to ground
6. Current ring to ground
— Inject test tones through codec interface or dedi-
cated input pin
— Analog output at dedicated output pin
RFI/EMC-CISP-22
Integrated 2 Form C ring relay:
— Low impulse noise
— Current-limited switches
— Break-before-make and make-before-break
switching
Meets
Telcordia Technologies
* GR1089 require-
ments with external protection device
44-pin, surface-mount plastic package (PLCC)
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Description
The L9311 electronic line interface and line access cir-
cuit (LILAC) provides all the functions that are neces-
sary to interface a codec to the tip and ring of a
subscriber loop, integrating the battery feed and ringing
access relay in one low-power, low-cost package. The
physical construction of the device is two chips. The
first chip is manufactured in Agere 90 V complemen-
tary bipolar integrated circuit (CBIC-S) technology. This
chip contains the SLIC functionality:
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ac transmission path
dc feedback and functions
Active dc current limit
Active mode loop supervision
Thermal shutdown
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*
Telcordia Technologies
is a registered trademark of Bell Communi-
cations Research, Inc.
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Agere Systems Inc.
AGERE [ AGERE SYSTEMS ]
