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The PBL 386 10/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated circuit for use in PBX, Terminal adapters and other telecommunications equipment. The PBL 386 10/2 has been optimized for low total line interface cost and a high degree of flexibility in different applications.
The PBL 386 10/2 emulates a transformer equivalent dc-feed, programmable between 2x25 and 2x900 , with short loop current limiting adjustable to max 65 mA.
A second lower battery voltage may be connected to the device to reduce short loop power dissipation. The SLIC automatically switches between the two battery supply voltages without need for external components or external control.
The SLIC incorporates loop current, ground key and ring trip detection functions. The PBL 386 10/2 is compatible with loop start signalling.
Two- to four-wire and four- to two-wire voice frequency (vf) signal conversion is accomplished by the SLIC in conjunction with either a conventional CODEC/filter or with a programmable CODEC/filter, e.g. SLAC, SiCoFi, Combo II. The programmable line terminating impedance could be complex or real to fit every market.
Longitudinal line voltages are suppressed by a feedback loop in the SLIC and the longitudinal balance specifications meet Bellcore TR909 requirements. The PBL 386 10/2 package is 28-pin PLCC.
PBL38610/2 Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Temperature, Humidity
Storage temperature range
TStg
-55
+150
Operating temperature range
TAmb
-40
+110
Operating junction temperature range, Note 1
TJ
-40
+140
PBL38610/2 Features
• Selectable overhead voltage principle All adaptive: The overhead voltage follows 0.6 VPeak < signals < 5 VPeak. Semi adaptive: The overhead voltage follows 2.5 VPeak < signals < 5 VPeak. • Metering 1.6Vrms • High and low battery with automatic switching • Battery supply as low as -10V • Only +5V in addition to GND and battery (VEE optional) • 35 mW on-hook power dissipation in active state • Long loop battery feed tracks VBat for maximum line voltage • 44V open loop voltage @ -48 V battery feed • Constant loop voltage for line leakage <5 mA • On-hook transmission • Full longitudinal current capability during on-hook • Programmable loop & ring-trip detector threshold • Ground key detector • Analog temperature guard • Integrated Ring Relay Driver