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Microchip Technology LE9502BTC
- Part No.:
- LE9502BTC
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 44-TQFP Exposed Pad
- Datasheet:
-
LE9502BTC.pdf
- Description:
- IC TELECOM INTERFACE 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
LE9502BTC from Zarlink Semiconductor is a dual-channel Ringing Subscriber Line Interface Circuit (RSLIC) implementing full BORSCHT functions for two telephone lines. It delivers 70 Vpk ringing into 5 REN, supports programmable DC feed up to 45 mA, operates from +3.3 V and +8–40 V supplies, and integrates dual buck-boost switching regulators with line-voltage tracking for power efficiency in VoIP/DSL gateways.
For engineers reviewing the LE9502BTC datasheet, LE9502BTC pinout, LE9502BTC application, or LE9502BTC equivalent, this page provides verified functional identity, confirmed dual-channel SLIC architecture, exact 44-pin eTQFP package mapping, validated ringing and DC feed specifications, and real-world timing and interface constraints for voice-over-broadband line card design.
Technical Context
The LE9502BTC implements dielectrically isolated complementary bipolar technology to deliver BORSCHT functionality across two independent channels. Each channel features programmable states (Active, Reverse Polarity, Ringing, Standby, Disconnect), resistor-programmable DC feed limit (0–45 mA), and binary fault detection via dedicated F1/F2 pins.
Its dual switching power supply uses discontinuous-mode buck-boost topology with external clock control (nominal 85 kHz), VRAMP-based ramp generation, and cycle-by-cycle current limiting via ILS1/ILS2 pins referenced to VSW. Ringing is generated differentially at VRINGP/VRINGM with gain KR, supporting sinusoidal or trapezoidal waveforms under codec control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Ringing Output | 70 Vpk into 5 REN load; enables standard telephony ring signal delivery without external high-voltage amplification |
| DC Feed Current Limit | Programmable up to 45 mA via RDC pin; sets maximum loop current for battery feed compliance |
| Supply Voltage Range | +8 V to +40 V on VSW rail; accommodates wide input variation in DSLAM and home gateway power architectures |
| Operating States | Five programmable states: Active, Reverse Polarity, Ringing, Standby, Disconnect; enables full telephony signaling control |
| Package | 44-pin eTQFP (Green/RoHS-compliant); surface-mount footprint optimized for high-density line card layouts |
| Switching Frequency | Nominal 85 kHz; set by ISET resistor and VRAMP capacitor; balances efficiency, EMI, and regulator response |
| Fault Detection | Dedicated F1/F2 outputs per channel; asserts low on longitudinal current fault, foreign voltage, or thermal overload (>160°C) |
Pinout & Package
LE9502BTC is housed in a 44-pin enhanced Thin Quad Flat Package (eTQFP) with exposed thermal pad. The RoHS-compliant green package supports automated assembly and thermal dissipation in multi-port line cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (TIP), A2 (TIP) | Channel 1 & 2 Tip output | Power amplifier outputs driving telephone line tip conductors; support ±4 V headroom during ringing |
| B1 (RING), B2 (RING) | Channel 1 & 2 Ring output | Power amplifier outputs driving telephone line ring conductors; differential with A1/A2 for balanced ringing |
| VRINGP / VRINGM | Differential ringing input | Accepts quasi-balanced waveform from codec; defines ringing amplitude via gain KR |
| ILS1, ILS2 | Current sense inputs | Monitor external switch current via RLIM resistor; enable cycle-by-cycle current limiting at −0.28 V threshold |
| CHS1, CHS2 | Compensation nodes | Set switching regulator error amplifier compensation; stabilize feedback loop for VREG tracking |
| DET1, DET2 | Loop detector outputs | Indicate off-hook (Standby/Active/Reverse) or ring trip (Ringing state) based on programmed thresholds |
| RTRIP1, RTRIP2 | Ring trip threshold inputs | Set per-channel ring trip current (e.g., 74.6 mA) via external resistor to VREG |
| ISET, RDC | Reference & feed limit controls | ISET sets VRAMP frequency; RDC sets DC feed current limit threshold (0–30 mA range) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel integration | Single 44-pin IC replaces two discrete SLICs, reducing PCB area and component count in 8-port IADs |
| Line-voltage-tracking regulators | Two independent buck-boost supplies minimize power dissipation by dynamically adjusting VREG to match Tip/Ring voltage |
| Worldwide programmability | Resistor-based configuration of AC impedance, dual current limits, loop closure, and ring trip thresholds enables regional telephony compliance |
| Five-state control logic | Full BORSCHT state machine (Standby, Reverse Polarity, Active, Ringing, Disconnect) implemented via C1/C2/CHS interface |
| Binary fault reporting | Dedicated F1/F2 pins provide immediate hardware-level indication of longitudinal fault, foreign voltage, or thermal shutdown |
Applications
| Voice over IP Integrated Access Device | Cable Telephony NIU |
|---|---|
Use Scenario: 8-port residential gateway aggregating POTS lines over Ethernet/DSL. IC Role / Device Role / Timing Role: Dual-channel RSLIC providing BORSCHT functions for two simultaneous analog lines per device. Use Value: Enables compact, low-power line card design with 70 Vpk ringing and programmable DC feed matching North American and European standards. | Use Scenario: Network Interface Unit connecting coaxial cable plant to analog phones in multi-dwelling units. IC Role / Device Role / Timing Role: SLIC managing loop closure, ringing, and off-hook detection for legacy phone service over HFC infrastructure. Use Value: Supports 5 REN loading and short-loop (<2000 ft) operation while maintaining thermal stability under continuous ringing duty cycles. |
| Fiber-to-the-Home Terminal | Wireless Local Loop Base Station |
Use Scenario: FTTH ONT delivering POTS service alongside GPON data. IC Role / Device Role / Timing Role: Dual-line interface handling battery feed, AC impedance matching, and ringing signal generation for fiber-based voice access. Use Value: Integrates boost switching supply to operate from limited DC input (e.g., 12 V PoE-derived rail), eliminating need for external DC-DC converters. | Use Scenario: WLL base station providing analog line interfaces for rural telephony where copper loops are unavailable. IC Role / Device Role / Timing Role: RSLIC executing reverse polarity, disconnect, and ringing states under wireless backhaul control. Use Value: Programmable hook-switch and ring-trip thresholds allow adaptation to variable line conditions and long-loop impedances typical in wireless access networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RSLIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LE9501BTC | Single-channel RSLIC; identical architecture and pinout per channel but lacks second channel integration | Requires two devices for dual-line systems; increases board area and power supply complexity | Select when only one line is needed or when channel isolation mandates separate ICs |
| LE77D11 | VoSLIC™ device; integrates SLIC + codec in single package; no external codec required | Eliminates external codec interface but fixes voice processing path; less flexible for custom DSP implementations | Select when system-level integration and reduced component count outweigh need for independent codec selection |
Compared with LE9501BTC and LE77D11, the LE9502BTC uniquely delivers dual-channel RSLIC functionality with independent programmability and external codec flexibility-enabling higher port density in space-constrained VoIP gateways without sacrificing signal chain control.
Availability
LE9502BTC is available at Aetrix Electronics and suitable for Voice over IP gateways, Cable Telephony NIUs, and Fiber-to-the-Home terminals requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for LE9502BTC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Zarlink Semiconductor was a fabless provider specializing in communications ICs for voice, broadband, and timing applications before its acquisition by Microsemi in 2011.
The LE9502BTC belongs to the VE950 series RSLIC product line, designed specifically to reduce system cost and complexity in voice-over-broadband equipment by integrating dual BORSCHT channels with adaptive power regulation.
FAQ
What is the maximum ringing voltage the LE9502BTC can deliver?
The LE9502BTC delivers 70 Vpk into a 5 REN load with nominal +12 V VSW supply. It is capable of 90 Vpk under optimized conditions using an external high-voltage PNP transistor (e.g., Zetex FZT955) in the switching regulator circuit, as documented in the application note for the LE9502BTC.
Does the LE9502BTC require an external codec to operate?
Yes, the LE9502BTC requires an external codec device for voice signal conversion and control. It interfaces via differential analog signals (VINP/VINM, VOUT) and digital control lines (C1/C2/CHS). Unlike integrated VoSLIC™ solutions such as the LE77D11, the LE9502BTC does not embed codec functionality.
How is DC feed current programmed on the LE9502BTC?
DC feed current limit on the LE9502BTC is programmed via an external resistor (RDC) connected between the RDC pin and AGND. The threshold ILTH is calculated as ILTH = 1.4 V / RDC, supporting a range from 0 to 30 mA. This sets the constant-current region of the DC feed curve, with short-circuit current ISC = ILTH + 17.0 mA.
What package type and RoHS status does the LE9502BTC have?
The LE9502BTC is supplied in a 44-pin eTQFP package with exposed thermal pad and meets RoHS Directive 2002/95/EC. The "green package" designation confirms lead-free terminations and compliant molding compound, verified in the official ordering information section of the LE9502BTC datasheet.
Can the LE9502BTC operate from a single power supply?
No, the LE9502BTC requires two distinct supplies: a +3.3 V rail for logic and analog reference circuits, and a separate positive VSW rail ranging from +8 V to +40 V for the switching regulators and power amplifiers. The dual-supply architecture is fundamental to its line-voltage-tracking power efficiency and cannot be bypassed.
LE9502BTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-TQFP Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Subscriber Line Interface Concept (SLIC)
- Interface:
- 2-Wire
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.3V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-eTQFP (10x10)
LE9502BTC FAQ
1.How can I place an order for LE9502BTC through Aetrix?
Please submit a Request for Quotation (RFQ) for LE9502BTC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LE9502BTC reliable?
The price and inventory of LE9502BTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE9502BTC is usually 5 days.
3.What payment methods are accepted for LE9502BTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE9502BTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE9502BTC?
LE9502BTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE9502BTC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LE9502BTC?
For technical support, including LE9502BTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE9502BTC requirements.
6.How does Aetrix verify that LE9502BTC is sourced from the original manufacturer or authorized distributors?
All LE9502BTC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LE9502BTC meets industry standards.
7.What is the process for return or replacement of LE9502BTC?
All LE9502BTC units undergo pre-shipment inspection (PSI). If there is an issue with LE9502BTC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LE9502BTC part is unused and in its original packaging.
Return procedure for LE9502BTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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