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LUCL9310GP-D Datasheet(PDF) 7 Page - Agere Systems |
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LUCL9310GP-D Datasheet(HTML) 7 Page - Agere Systems |
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7 / 60 page  Data Sheet July 2001 Full-Feature SLIC, Ringing Relay, and Test Access Device L9310 Line Interface and Line Access Circuit Agere Systems Inc. 7 Description (continued) The various test modes are achieved through a series of integrated analog switches that can reconfigure the SLIC to provide normal SLIC operation or the appropri- ate test function. Details are given in the Special Func- tions, Line Test section of this data sheet. Test modes are achieved through the device state table. When entering a test mode, the state of the SLIC is unchanged; thus, testing can be done with the SLIC in forward and reverse battery active modes. Addition- ally, via the line break switches associated with the ring relay, use of a tip open or ring open state is used to make single-ended voltage and current measurements. Data control is via a parallel latched data control scheme. Data latches are edge-level sensitive. Data is latched in when the LATCH control input goes low. While LATCH is low, the user cannot change the data control inputs. The data control inputs may only be changed when LATCH is high. Incorporation of data latches allows for data control information and loop supervision information to be passed to and from the SLIC via data buses rather than on a per-line basis, thus minimizing routing complexity and board routing area. A device RESET pin is included. When this pin is low, the logic inputs are overridden and the device will be reset into SLIC forward disconnect state and the switch into the all-off state. NSTAT is forced to the on-hook condition when RESET is low. The overall device protection is achieved through a combination of an external secondary protector, along with an integrated thermal shutdown feature, a battery voltage window comparator, the break switch foldback characteristic, and the dc/dynamic current-limit response of the break and tip return switches. For protection against long duration fault conditions, such as power cross and tip/ring shorts, a thermal shut- down mechanism is integrated into the device. Upon reaching the thermal shutdown temperature, the device will enter an all-off mode. Upon cooling, the device will re-enter the state it was in prior to thermal shutdown. Hysteresis is built in to prevent oscillation. During this mode, the NSTAT supervision output overrides the actual loop status and forces an off-hook. The line break switches and tip return switch are current-limited switches. The current-limit mechanism limits current through the switch to the specified dc cur- rent limit under low frequency or dc faults (power cross and/or tip/ring to ground short) and limits the current to the specified dynamic current-limit response under transient faults, such as lightning. A foldover characteristic is incorporated into the line break switches within their I-V curve. Under voltage conditions higher than the normal operating range, such as may be seen under an extreme lightning or power cross fault condition, the line break switch will foldover into a low-current state. This feature allows for more relaxed specifications on the ring side protector, thus allowing for higher-voltage ringing signals. (Tip side protector is limited by the requirements on the tip return switch.) This feature is part of the overall device protection scheme. This device uses a window comparator to force an all- off condition if the battery drops below, or rises above, a specified threshold. Upon loss of VBAT1, the L9310 will automatically enter an all-off mode. The device will enter this mode if the magnitude of the battery drops below a nominal 15 V and will remain in this mode until the magnitude of the battery rises above a typical 20 V. During this mode, the NSTAT supervision output will override the actual hook status and force an off-hook or logic low. When the device is in the scan mode, because of the design of the scan clamp circuit, common-mode cur- rent can be forced into or out of the battery supply. Because of this, and depending upon power supply design, the magnitude of the battery may rise above the maximum operating condition during extended lon- gitudinal currents or during a power cross fault condi- tion. To prevent excess current from being forced into or out of the battery, if the magnitude of the battery rises typically above 75 V to 80 V, the device will enter an all-off state. The device will remain in the all-off state until the magnitude of the battery drops into the normal operating range. During this mode, the NSTAT supervi- sion output will override the actual hook status and force an off-hook or logic low. See the Protection section of this data sheet for more details on device protection. Please contact your Agere Account Representative for a recommended secondary protection device. Longitudinal balance is consistent with European ETSI and North American GR-909 requirements. |
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Similar Description - LUCL9310GP-D |
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