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Analog Devices Inc./Maxim Integrated DS21348G+
- Part No.:
- DS21348G+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 49-LFBGA, CSPBGA
- Datasheet:
-
DS21348G+.pdf
- Description:
- IC TELECOM INTERFACE 49CSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:316
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Product details
Overview
DS21348G+ from Maxim Integrated is a single-channel, 3.3V E1/T1/J1 line interface unit (LIU) supporting both short-haul and long-haul trunks. It integrates full G.703-compliant waveshaping, software-selectable 75Ω/100Ω/120Ω receive termination, crystal-less jitter attenuation (32-/128-bit FIFO), and AMI/HDB3/B8ZS encoding/decoding - enabling direct connection to telecom line infrastructure in access nodes and CSU/DSU equipment.
For engineers reviewing the DS21348G+ datasheet, DS21348G+ pinout, DS21348G+ application, or DS21348G+ equivalent, key selection considerations include its 49-ball CSBGA (7mm × 7mm) package, dual-mode (parallel/serial/hardware) control interface, programmable receive sensitivity (0dB to –43dB for E1, 0dB to –36dB for T1), and compliance with ANSI T1.403-1999, ITU G.703/G.704/G.775, and ETSI ETS 300 166 standards.
Technical Context
The DS21348G+ implements a fully integrated analog front-end with transformer-coupled RTIP/RRING inputs and TTIP/TRING outputs, featuring active receive equalization and programmable line build-out (0dB/–7.5dB/–15dB/–22.5dB for T1; G.703 E1 waveshapes for 75Ω/120Ω). Its on-chip PLL recovers clock/data from AMI/HDB3/B8ZS waveforms, while the crystal-less jitter attenuator accepts only 2.048MHz (E1/T1) or optional 1.544MHz (T1) MCLK and synthesizes BPCLK at 2.048/4.096/8.192/16.384MHz referenced to RCLK.
Control is implemented via 8-bit parallel (muxed/non-muxed Intel/Motorola), serial (SPI-like), or hardware mode - with dedicated pins for loopback activation (RLB/LLB/ALB), PRBS generation/detection (2¹⁵–1 or 2²⁰–1), in-band loop code handling (1–16 bits), and alarm detection (AIS/Blue, RCL per G.775, transmit open-circuit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - enables direct integration into modern 3.3V telecom subsystems without level-shifting or LDO overhead. |
| Data Rates | E1: 2.048Mbps; T1: 1.544Mbps - supports full-rate line interface operation with no external rate adaptation required. |
| Receive Sensitivity | E1: 0dB to –43dB; T1: 0dB to –36dB - allows reliable operation over 2.5km (E1) or 6k ft (T1) of 22AWG cable without external amplification. |
| Jitter Attenuation | Crystal-less, 32-bit or 128-bit FIFO depth - eliminates need for external VCXO/TCXO while meeting G.823 jitter transfer requirements. |
| Encoding Support | AMI, HDB3 (E1), B8ZS (T1) - ensures full protocol compliance for legacy and deployed E1/T1 networks. |
| Line Build-Out | T1: DSX-1/CSU options (0dB, –7.5dB, –15dB, –22.5dB); E1: G.703-compliant 75Ω/120Ω waveshaping - matches physical layer requirements across regional standards. |
| Interface Modes | 8-bit parallel (Intel/Motorola, muxed/non-muxed), serial (3-wire), hardware control - provides flexible host processor integration without dedicated controller overhead. |
Pinout & Package
DS21348G+ uses a 49-ball CSBGA package (7mm × 7mm, RoHS-compliant), with ball pitch of 0.5mm. Pin functions are mode-dependent (parallel/serial/hardware); all modes share core analog I/O (RTIP/RRING, TTIP/TRING), clock (MCLK, RCLK, TCLK, BPCLK), and control (HRST, TEST, INT, PBEO) balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog Receive Input | Transformer-coupled differential inputs for E1/T1 waveform recovery; support internal 75Ω/100Ω/120Ω termination selection. |
| TTIP / TRING | Analog Transmit Output | Current-limited (50mA RMS) differential outputs driving line transformers; support E1 G.703 or T1 DSX-1/CSU line build-outs. |
| RPOS / RNEG | Bipolar/NRZ Data Output | Recovered data output synchronized to RCLK; NRZ mode enabled via CCR1.6 for backplane interfacing. |
| TPOS / TNEG | Bipolar/NRZ Data Input | Transmit data input sampled on TCLK edge; configurable polarity and timing via CCR2.1. |
| MCLK | Master Clock Input | 2.048MHz (±50ppm) TTL-level reference for clock recovery and jitter attenuation; 1.544MHz supported for T1-only operation. |
| RCLK | Recovered Clock Output | Buffered line-recovered clock, synchronous to MCLK when no signal present - used for timing downstream logic or BPCLK synthesis. |
| BPCLK | Backplane Clock Output | Synthesized 2.048/4.096/8.192/16.384MHz clock derived from RCLK - provides clean system clock for FPGA or ASIC backplanes. |
| HRST | Hardware Reset Input | Active-low asynchronous reset that initializes all registers to default state (all zeros), ensuring deterministic startup behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable receive termination | 75Ω/100Ω/120Ω options configured via internal register - eliminates need for external resistor networks or board revisions. |
| Crystal-less jitter attenuation | 32-bit or 128-bit FIFO depth placed in TX or RX path - meets G.823 jitter transfer specs without external oscillator components. |
| Multi-standard encoding/decoding | Native AMI (E1/T1), HDB3 (E1), B8ZS (T1) support - ensures interoperability across global E1, T1, and J1 network deployments. |
| Programmable line build-out | Four T1 CSU/DSX-1 levels (0dB, –7.5dB, –15dB, –22.5dB); E1 G.703 waveshaping - matches physical layer requirements for different cable lengths and topologies. |
| Comprehensive diagnostics | PRBS gen/detect (2¹⁵–1, 2²⁰–1), in-band loop codes (1–16 bits), remote/local/analog loopbacks - enables full line validation without external test gear. |
| Triple-control interface | Parallel (Intel/Motorola), serial (3-wire), or hardware mode - simplifies integration with diverse host processors and reduces firmware complexity. |
Applications
| Channel Bank Interface | CSU/DSU Equipment |
|---|---|
|
Use Scenario: Interfacing digital line cards to legacy E1/T1 trunk lines in central office channel banks. IC Role / Device Role / Timing Role: Line interface unit providing physical layer conversion, clock recovery, and jitter attenuation between backplane data bus and analog line. Use Value: Enables direct replacement of discrete analog front-ends with single-chip solution meeting ANSI T1.403 and ITU G.703 compliance. |
Use Scenario: Embedded T1/E1 termination in customer-premises CSU/DSU units for WAN connectivity. IC Role / Device Role / Timing Role: Full LIU implementing line build-out, AIS detection, RCL monitoring, and loopback support per G.775. Use Value: Reduces BOM count by integrating transformer interface, waveshaping, and diagnostics - accelerating time-to-certification for Telcordia GR-1089 compliance. |
| Remote Terminal Unit | Network Access Server |
|
Use Scenario: Providing E1/T1 uplink capability in outdoor remote terminal units for cellular backhaul. IC Role / Device Role / Timing Role: Robust line driver/receiver with –43dB E1 sensitivity and 50mA current limiting - withstands harsh electrical environments. Use Value: Supports 2.5km E1 reach over 22AWG cable without repeaters, reducing site power and maintenance costs. |
Use Scenario: Multi-port T1/E1 aggregation in enterprise-grade network access servers. IC Role / Device Role / Timing Role: Synchronized multi-channel LIU with BPCLK output - enables coherent timing across multiple ports and backplane logic. Use Value: 16.384MHz BPCLK derived from RCLK eliminates need for separate system clock distribution, improving jitter performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar line interface unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q348N+ | Quad-channel version in 144-ball CSBGA; identical per-channel architecture and register map - shares same firmware and layout footprint scaling. | Designed for multi-port systems (e.g., 4×T1/E1 line cards); requires larger PCB area and higher total power (4×). | Select DS21Q348N+ when aggregating ≥4 E1/T1 lines on one board; retains full feature parity and software compatibility. |
| DS2155LN+ | Legacy 5V-compatible LIU; lacks crystal-less jitter attenuator and 3.3V-only operation; lower receive sensitivity (–36dB max for T1). | Targeted at older 5V designs; not RoHS-compliant; does not support 2.048MHz-only clocking or 128-bit jitter FIFO. | Choose DS2155LN+ only for drop-in replacement in existing 5V systems where redesign is prohibitive; DS21348G+ offers superior jitter performance and power efficiency. |
Compared with DS21Q348N+, DS21348G+ delivers identical per-channel performance in a space-optimized single-channel package ideal for cost-sensitive or low-density line cards; compared with DS2155LN+, it enables modern 3.3V designs with enhanced jitter attenuation, wider sensitivity range, and full RoHS compliance - requiring no PCB changes beyond voltage rail adjustment.
Availability
DS21348G+ is available at Aetrix Electronics and suitable for telecom infrastructure, network access equipment, and industrial communications systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for DS21348G+ 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.
The DS21348G+ belongs to Maxim's telecom line interface product line, designed specifically for E1/T1/J1 physical layer implementation in carrier-grade and enterprise networking equipment - emphasizing integration, standards compliance, and diagnostic capability.
FAQ
What is the operating temperature range for DS21348G+?
The DS21348G+ is rated for 0°C to +70°C ambient operation, as confirmed in the Ordering Information table and thermal characteristics section. This commercial-grade temperature range aligns with typical indoor telecom equipment deployment conditions. The device uses a 49-ball CSBGA package optimized for thermal dissipation within this envelope. DS21348G+ does not support extended industrial temperature ranges; for –40°C to +85°C operation, the DS21348GN+ variant must be selected.
Does DS21348G+ require an external crystal oscillator?
No, DS21348G+ features a crystal-less jitter attenuator that operates with only a 2.048MHz master clock (MCLK) for both E1 and T1 applications, or optionally a 1.544MHz MCLK for T1-only use. This eliminates the need for external VCXOs or TCXOs, reducing bill-of-materials cost and board space. The jitter attenuator supports selectable 32-bit or 128-bit FIFO depth and can be placed in either the transmit or receive data path, as documented in the Detailed Description section.
How is receive termination configured on DS21348G+?
DS21348G+ supports internal software-selectable receive termination of 75Ω, 100Ω, or 120Ω via register configuration (CCR4 bits or equivalent control register), as specified in Table 2-12 and Section 7.1. This eliminates external resistor networks and allows runtime adaptation to different line impedances. Termination is applied across RTIP and RRING inputs, and the setting persists across hardware reset. External termination remains an option if higher precision or custom values are required.
What standards does DS21348G+ comply with?
DS21348G+ complies with ANSI T1.403-1999, ANSI T1.408, AT&T TR 62411, ITU-T G.703, G.704, G.706, G.736, G.775, G.823, I.431, O.151, O.161, ETSI ETS 300 166, JTG.703, JTI.431, JJ-20.1, TBR12, TBR13, and CTR4. These cover physical layer signaling, framing, alarm handling, jitter tolerance, and timing accuracy for E1 and T1 networks. Compliance is verified through on-chip circuit design and tested AC characteristics per the datasheet's Tables 11-1 through 11-5.
Can DS21348G+ generate and detect in-band loop codes?
Yes, DS21348G+ supports generation and detection of in-band loop codes from 1 to 16 bits in length, including CSU-specific loop codes, as stated in the FEATURES list and detailed in Section 6.1. Loop code length is programmable via control registers, and detection status is reported in status registers. This capability enables standardized remote line testing and fault isolation per ANSI T1.403 and ITU G.704 without requiring external pattern generators.
DS21348G+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 49-LFBGA, CSPBGA
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- -
- Interface:
- Serial
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 49-CSBGA (7x7)
DS21348G+ FAQ
1.How can I place an order for DS21348G+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21348G+ 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 DS21348G+ reliable?
The price and inventory of DS21348G+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21348G+ is usually 5 days.
3.What payment methods are accepted for DS21348G+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21348G+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21348G+?
DS21348G+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21348G+ 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 DS21348G+?
For technical support, including DS21348G+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21348G+ requirements.
6.How does Aetrix verify that DS21348G+ is sourced from the original manufacturer or authorized distributors?
All DS21348G+ 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 DS21348G+ meets industry standards.
7.What is the process for return or replacement of DS21348G+?
All DS21348G+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21348G+, 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 DS21348G+ part is unused and in its original packaging.
Return procedure for DS21348G+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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