Product Overview
The PM4351-RGI from Microchip Technology is a Line Interface Unit (LIU) for E1/T1 telecommunications applications, supporting data rates up to 8.192Mbps. It features short-haul and long-haul operation, integrated clock and data recovery (CDR), and parallel or serial interface. Operating from a 3.3V supply, it is housed in an 80-pin MQFP (14x14mm) package.
Key Specifications
| Category | Telecom Line Interface Unit |
| Standards | E1 / T1 |
| Max Data Rate | 8.192 Mbps |
| Channels per Chip | 1 |
| Haul Type | Short / Long Haul |
| Interface Type | Parallel / Serial |
| Integrated CDR | Yes |
| Internal Matching Impedance | Yes |
| Supply Voltage | 3.135V ~ 3.465V (3.3V typical) |
| Operating Temperature | -40°C ~ 85°C |
| Package | 80-MQFP (14x14mm) |
| Part Status | Obsolete |
Features
- Single-channel E1/T1 line interface unit
- Short-haul and long-haul operation support
- Integrated clock and data recovery (CDR)
- Internal impedance matching
- Parallel and serial microprocessor interface
- 3.3V single supply operation
- Standard E1 (2.048Mbps) and T1 (1.544Mbps) framing
- Diagnostic and performance monitoring features
- E1/T1 telecommunications equipment
- Digital cross-connect systems
- Channel banks and multiplexers
- Router and switch line cards
- Legacy telecom infrastructure
- Telco Line Cards: E1/T1 interface on router and switch line cards
- Digital Cross-Connect: Channelized E1/T1 switching in DACS systems
- Channel Banks: T1-to-analog conversion in PBX interfaces
- Multiplexers: E1/T1 aggregation in telecom transmission equipment
- Legacy Infrastructure: Maintenance and replacement of existing E1/T1 systems
- Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
- Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
- Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.
- Accepted Payment Methods
- T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
- PayPal: Ideal for small orders, sample orders and quick payments.
Settlement Currency
US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.
Bank Charges
All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.
- Payment Requirements
- Sample and small orders: Shipment will be arranged upon full payment.
- In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.
- Logistics Partners
- International Express: DHL, FedEx, UPS, TNT
- Economy Logistics: Air freight and sea freight for large-volume cargo
- Domestic Delivery: SF Express, Yunda Express
- Order Processing Time
- In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
- Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
- Estimated Transit Time
- International Express: 3 – 7 working days globally
- Air Freight: 7 – 12 working days
- Sea Freight: 25 – 40 working days for heavy and large bulk cargo
- Shipping Fee Rules
- Shipping cost is calculated based on package weight, volume, destination and delivery method.
- Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
- Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
- Shipment Tracking
Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.
MOQ & Sample Service
We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.
Packaging Standard
All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.
Import Duties & Taxes
All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.
- Handling of Lost or Damaged Goods
- In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
- We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.
- Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
- Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
- Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.
- All components are packed separately to avoid damage caused by friction and collision;
- Shockproof buffer materials are added for fragile products to ensure transportation safety;
- Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.
- Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
- Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
- Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
- Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
- Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.
Applications
The PM4351-RGI from Microchip Technology is a single-channel E1/T1 Line Interface Unit (LIU) designed for telecommunications equipment. It supports both short-haul and long-haul operation with integrated clock and data recovery (CDR), eliminating the need for external clock recovery components. The device features internal impedance matching for both E1 (75Ω coaxial / 120Ω twisted pair) and T1 (100Ω twisted pair) line interfaces. The PM4351 provides both parallel and serial microprocessor interface options for flexible system integration. Built on 0.35μm process technology, it operates from a single 3.3V supply and supports data rates up to 8.192Mbps, covering E1 (2.048Mbps), T1 (1.544Mbps), and higher-rate clear-channel applications.
The PM4351-RGI interfaces between the digital system backplane and the E1/T1 transmission line. On the receive side, the line receiver amplifier accepts the incoming signal from the line transformer, applies internal impedance matching, and passes it to the CDR circuit which extracts the clock and retimes the data. The framer processes the recovered data according to E1 or T1 framing standards, performing bit and frame alignment, CRC checking, and performance monitoring. On the transmit side, the framer generates the proper framing pattern, and the line driver amplifies the signal to the appropriate level for the line interface. The device supports both short-haul (CSU/DSU) and long-haul (span) configurations with programmable line build-out settings.
| Pin Group | Count | Description |
|---|---|---|
| Line Interface | 8 | TTIP, TRING, RTIP, RRING (E1/T1 line pairs) |
| Parallel Data Bus | 16 | D0-D15 bidirectional data bus |
| Address/Control | 8 | A0-A5, RD, WR, CS |
| Serial Interface | 4 | SDI, SDO, SCLK, SCS (SPI-like) |
| System Interface | 8 | RCLK, TCLK, RFS, TFS, RDATA, TDATA, etc. |
| Power/Ground | 12 | VDD (3.3V) and GND |
| Control/Misc | 24 | Interrupt, reset, mode select, test pins |
| Model | Manufacturer | Key Difference |
|---|---|---|
| PM4352-RGI | Microchip | Dual-channel version |
| PM4354-RGI | Microchip | Quad-channel LIU |
| DS26528 | Maxim/Analog | 8-channel LIU, more integrated |
| XRT82L33 | MaxLinear | Single E1/T1 LIU, 3.3V |
| LXT384 | Intel/Microchip | Quad T1/E1 LIU, older generation |
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