Document
Preliminary
May 2000
PBL 386 65/2 Subscriber Line Interface Circuit
Description
The PBL 386 65/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated circuit for use in DLC, Central Office and other telecommunications equipment. The PBL 386 65/2 has been optimized for low total line interface cost and a high degree of flexibility in different applications. The PBL 386 65/2 emulates a transformer equivalent dc-feed, programmable between 2x25 Ω and 2x900 Ω, 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 65/2 is compatible with loop start and ground 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 the DLC requirements. The PBL 386 65/2 package is 28-pin PLCC and 28-pin SSOP.
Key Features
• Selectable overhead voltage principle – All adaptive: The overhead voltage follows 0.6PeakV < signals < 6.2VPeak. – Semi adaptive: The overhead voltage follows 3.1VPeak < signals < 6.2VPeak. • Metering 2.2 Vrms • High and low battery with automatic switching • Battery supply as low as -10 V • Only +5 V in addition to GND and battery (VEE optional) • 39 mW on-hook power dissipation in active state • Long loop battery feed tracks VBat for maximum line voltage • 44V open loop voltage @ -48V battery feed • Constant loop voltage for line leakage <5 mA • On-hook transmission • Full longitudinal current capability during on-hook
Ring Relay Driver
RRLY
• Programmable loop & ring-trip detector threshold • Ground key detector • Analog temperature guard • Tip open state with ring ground detector • Silent polarity reversal • Line voltage measurement • -40° C to +85° C ambient temperature range
DT DR TIPX RINGX HP TS
Ring Trip Comparator Input Decoder and Control
C1 C2 C3 VCC DET
Ground Key Detector
Two-wire Interface
AOV VBAT2 VBAT
Line Feed Controller and Longitudinal Signal Suppression
PSG LP REF
Off-hook Detector
PLD AGND VTX
38 PB 6 L 65 /2
PLC
BGND
VF Signal Transmission
RSN VEE (Optional)
PB
6 L 38
65/
2
Figure 1. Block diagram.
28-pin PLCC and 28-pin SSOP.
1
PBL 386 65/2
Maximum Ratings
Parameter
Preliminary
Symbol
Min
Max
Unit
Temperature, Humidity Storage temperature range Operating temperature range Operating junction temperature range, Note 1 Power supply, -40°C ≤ TAmb ≤ +85°C VCC with respect to A/BGND VEE with respect to A/BGND VBat with respect to A/BGND, continuous VBat with respect to A/BGND, 10 ms VBat2 with respect to A/BGND Power dissipation Continuous power dissipation at TAmb ≤ +85 °C Ground Voltage between AGND and BGND Relay Driver Ring relay supply voltage Ring relay current Ring trip comparator Input voltage Input current Digital inputs, outputs (C1, C2, C3, DET) Input voltage Output voltage (DET not active) Output current (DET) TIPX and RINGX terminals, -40°C < TAmb < +85°C, VBat = -50V Maximum supplied TIPX or RINGX current TIPX or RINGX voltage, continuous (referenced to AGND), Note 2 TIPX or RINGX, pulse < 10 ms, tRep > 10 s, Note 2 TIPX or RINGX, pulse < 1 µs, tRep > 10 s, Note 2 TIP or RING, pulse < 250 ns, tRep > 10 s, Note 3
TStg TAmb TJ VCC VEE VBat VBat VBat2 PD VG
-55 -40 -40 -0.4 VBat -75 -80 VBat
+150 +110 +140 6.5 0.4 0.4 0.4 0.4 1.5
°C °C °C V V V V V W V V
-5
VCC BGND +13 75 mA
VDT, VDR IDT, IDR VID VOD IOD ITIPX, IRINGX VTA, VRA VTA, VRA VTA, VRA VTA, VRA
VBat -5 -0.4 -0.4
VCC 5 VCC VCC 30
V mA V V mA
-110 VBat VBat - 20 VBat - 40 VBat - 70
+110 2 5 10 15
mA V V V V
Recommended Operating Condition
Parameter Symbol Min Max Unit
Ambient temperature VCC with respect to AGND VEE with respect to AGND VBat with respect to BGND VBat2 with respect to BGND
TAmb VCC VEE VBat
-40 4.75 VBat -58 VBat
+85 5.25 -4.75 -10 -10
°C V V V V
Notes
1. 2. 3. The circuit includes thermal protection. Operation above max. junction temperature may degrade device reliability. A diode in series with the VBat input increases the permitted continuous voltage and pulse < 10 ms to -85 V. A pulse ≤1µs is increased to the greater of |-70V| and |VBat -40V|. RF1, FR2 ≥20 Ω is also required. Pulse is supplied to TIP and RING outside RF1, FR2.
2
Preliminary
Electrical Characteristics
PBL 386 65/2
-40 °C ≤ TAmb ≤ +85 °C, VCC = +5V ±5 %, VEE = -5V ± 5%, VBat = -58V to -40V, RLC=18.7kΩ, IL = 27 mA, ZL = 600 Ω, RF1, RF2 =0 Ω, RRef = 15.