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Analog Devices Inc./Maxim Integrated DS21348GB
- Part No.:
- DS21348GB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Unclassified
- Package:
- Datasheet:
-
DS21348GB.pdf
- Description:
- IC LIU COMM T1/E1/J1 3.3V 49-BGA
- Quantity:
- Payment:
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Inventory:187
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Product details
Overview
DS21348GB 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 delivers programmable receive-side termination (75Ω/100Ω/120Ω), crystal-less jitter attenuation (32-bit or 128-bit FIFO), and full G.703/G.704-compliant waveform generation for E1 (AMI/HDB3) and T1 (AMI/B8ZS) applications in telecom access equipment.
For engineers reviewing the DS21348GB datasheet, DS21348GB pinout, DS21348GB application, or DS21348GB equivalent, key selection criteria include its dual-standard support (E1 & T1), software-selectable line build-out (0dB to –22.5dB), 2.048MHz/1.544MHz master clock flexibility, bipolar/NRZ data I/O, and integrated PRBS generation/detection for loop testing.
Technical Context
The DS21348GB implements a fully integrated analog front-end with transformer-coupled RTIP/RRING inputs and TTIP/TRING outputs, supporting CEPT 30/ISDN-PRI (E1) and DSX-1/CSU (T1) line configurations. Its receive sensitivity spans 0dB to –43dB for E1 and 0dB to –36dB for T1, enabling operation over 2.5km (E1) or 6k ft (T1) cables.
It integrates a PLL-based clock/data recovery engine, selectable jitter attenuator placement (transmit or receive path), and configurable monitor mode with gain control. The device supports three bus interfaces-8-bit parallel (muxed/nonmuxed Intel/Motorola), serial (SPI-like), or hardware mode-with dedicated pins for loopback control, alarm detection (AIS/RCL), and transmit open-circuit monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - Enables direct integration into modern low-voltage telecom systems without level-shifting. |
| Data Standards | E1 (G.703/G.704 AMI/HDB3), T1 (ANSI T1.403-1999 AMI/B8ZS), J1 - Single device supports global telephony trunk standards. |
| Jitter Attenuation | Crystal-less, 32-bit or 128-bit FIFO depth - Eliminates external crystal requirement; supports 2.048MHz (E1/T1) or 1.544MHz (T1 only) MCLK. |
| Line Build-Out | E1: 0dB / –7.5dB / –15dB / –22.5dB (G.703); T1: DSX-1 or CSU profiles - Programmable output drive strength matches cable length and impedance. |
| Receive Termination | Software-selectable 75Ω / 100Ω / 120Ω - Supports multiple physical layer topologies without external resistor changes. |
| Interface Options | 8-bit parallel (Intel/Motorola timing), serial (3-wire), or hardware mode - Flexible host controller integration across legacy and space-constrained designs. |
| Alarm Detection | G.775-compliant Receive Carrier Loss (RCL), AIS (Blue Alarm), Transmit Open-Circuit - Enables autonomous fault reporting in unattended sites. |
Pinout & Package
DS21348GB is housed in a 49-ball CSBGA package (7mm × 7mm), RoHS-compliant and lead-free. Pin functions are mode-dependent (parallel/serial/hardware); all modes share critical analog I/O (RTIP/RRING, TTIP/TRING), clock (MCLK, RCLK, BPCLK), and control (HRST, INT, TEST) pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog receive input pair | Transformer-coupled differential inputs for E1/T1 waveform recovery; supports internal termination selection. |
| TTIP / TRING | Analog transmit output pair | High-current line driver outputs; capable of driving 75Ω/120Ω E1 or DSX-1/CSU T1 lines with programmable build-out. |
| RPOS / RNEG | Bipolar/NRZ receive data outputs | Synchronous to RCLK; NRZ mode enables error pulse indication on RNEG while valid data appears on RPOS. |
| TPOS / TNEG | Bipolar/NRZ transmit data inputs | Sampled on TCLK edge; polarity and sampling edge configurable via CCR2.1 for timing alignment. |
| MCLK | Master clock input | Accepts 2.048MHz (±50ppm) for E1/T1 or optional 1.544MHz for T1-only operation; feeds PLL and jitter attenuator. |
| RCLK | Recovered receive clock output | Buffered, low-jitter clock synchronized to incoming line signal; used as reference for backplane clock synthesis (BPCLK). |
| BPCLK | Backplane clock output | Synthesized at 16.384MHz / 8.192MHz / 4.096MHz / 2.048MHz, referenced to RCLK - provides system timing without external oscillator. |
| HRST | Hardware reset input | Active-low asynchronous reset; initializes all registers to default state (all zeros) and disables outputs until deasserted. |
| INT | Interrupt output | Open-drain, active-low flag for status changes (e.g., RCL, AIS, PRBS lock, error counters) per Status Register definitions. |
| TEST | Tri-state control input | Drives all I/O and control pins into high-impedance state when high - enables board-level functional test without isolation circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | 32-bit or 128-bit FIFO depth placed in TX or RX path - eliminates external crystal, reduces BOM count, and simplifies layout. |
| Programmable line build-out | Four discrete E1/T1 profiles (0dB to –22.5dB) - matches transmission loss across varying cable lengths and topologies. |
| Multi-standard encoding/decoding | AMI/HDB3 (E1) and AMI/B8ZS (T1) in one silicon - avoids dual-LIU solutions and reduces PCB area in multi-region deployments. |
| In-band loop code handling | Generates/detects 1–16-bit codes including CSU-specific patterns - enables interoperability with legacy T1 test equipment and network elements. |
| PRBS pattern generation/detection | 2¹⁵–1 and 2²⁰–1 sequences with real-time bit-error pulse output (PBEO) - provides deterministic link integrity verification without external test gear. |
| Three flexible control interfaces | Parallel (Intel/Motorola), serial (3-wire), or hardware mode - accommodates microcontroller, FPGA, or minimal-pin-count host designs. |
Applications
| DSLAM Line Card | Enterprise T1/E1 Router |
|---|---|
|
Use Scenario: Aggregating multiple T1/E1 lines in carrier-class DSLAM line cards for broadband access networks. IC Role / Device Role / Timing Role: Primary LIU performing clock recovery, line drive, and framing-agnostic physical layer interfacing. Use Value: Supports both ANSI T1.403 and ITU G.703 standards in one device, reducing design variants and inventory SKUs across regional deployments. |
Use Scenario: Providing WAN connectivity in enterprise-grade routers with field-upgradable E1/T1 modules. IC Role / Device Role / Timing Role: Physical layer transceiver converting digital backplane data to analog line signals with embedded diagnostics. Use Value: Integrated PRBS and loopback capabilities enable remote link validation and troubleshooting without onsite technician dispatch. |
| Remote Terminal Unit (RTU) | Mobile Backhaul Interface |
|
Use Scenario: Deploying in outdoor cabinets for SCADA and utility automation where temperature range and reliability are critical. IC Role / Device Role / Timing Role: Robust line interface with –40°C to +85°C operation, RCL/AIS alarm reporting, and high-impedance safe state. Use Value: G.775-compliant RCL detection and 50mA RMS current limiting ensure fail-safe behavior during line faults or lightning-induced surges. |
Use Scenario: Connecting microwave or fiber backhaul units to legacy TDM infrastructure in 4G/LTE base stations. IC Role / Device Role / Timing Role: Bridging packet-switched transport to circuit-switched E1/T1 networks with jitter-controlled clock synthesis. Use Value: BPCLK output (16.384MHz/8.192MHz) serves as stable backplane clock for framer or mapper ICs, eliminating need for separate oscillator. |
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 set. | Designed for multi-port line cards requiring four independent E1/T1 interfaces on single chip. | Select DS21Q348N when consolidating four DS21348GB functions onto one die to reduce footprint and interconnect complexity. |
| MAX3005 | Single-channel 3.3V LIU with fixed 120Ω termination; no software-selectable build-out or crystal-less jitter attenuator. | Limited to short-haul E1 applications; lacks T1 support, PRBS, and in-band loop code handling. | Choose MAX3005 only for cost-sensitive, single-standard, short-reach E1 links where advanced diagnostics and flexibility are unnecessary. |
Compared with DS21348GB, DS21Q348N offers channel density and pin-compatible scalability but requires larger package and higher power; MAX3005 trades feature depth for lower cost and simpler configuration, making it unsuitable for mixed-standard or long-haul deployments.
Availability
DS21348GB is available at Aetrix Electronics and suitable for DSLAM line cards, enterprise T1/E1 routers, remote terminal units (RTUs), and mobile backhaul interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for DS21348GB 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 precision analog, mixed-signal, and power management ICs for communications, industrial, and computing markets.
The DS21348GB belongs to Maxim's telecom line interface product line, engineered for carrier-grade E1/T1/J1 physical layer interfacing in access networks, central offices, and enterprise edge equipment.
FAQ
What standards does the DS21348GB comply with?
The DS21348GB 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 E1/T1 physical layer signaling, timing, jitter, alarm reporting, and line build-out requirements - ensuring interoperability in global telecom infrastructure.
Does the DS21348GB require an external crystal?
No, the DS21348GB features a crystal-less jitter attenuator that operates with only a 2.048MHz master clock for both E1 and T1 applications, or optionally a 1.544MHz clock for T1-only use. This eliminates the need for an external crystal oscillator, reducing bill-of-materials cost and PCB area while maintaining jitter performance compliant with G.823.
How does the DS21348GB handle different line impedances?
The DS21348GB supports software-selectable receive-side termination of 75Ω, 100Ω, or 120Ω via internal configuration registers. This allows dynamic adaptation to various line types (e.g., coaxial 75Ω E1, twisted-pair 120Ω E1, or T1 DSX-1) without hardware changes - simplifying design reuse across multiple deployment scenarios.
Can the DS21348GB generate and detect in-band loop codes?
Yes, the DS21348GB generates and detects in-band loop-up and loop-down codes from 1 to 16 bits, including CSU-specific loop codes required for T1 network testing. This capability enables full compliance with AT&T TR 62411 and ANSI T1.403-1999 loopback procedures for remote diagnostics and maintenance.
What is the operating temperature range for the DS21348GB?
The DS21348GB is rated for industrial operation from –40°C to +85°C, matching the DS21348GN+ variant in 49-ball CSBGA packaging. This extended range ensures reliable performance in outdoor cabinets, central office environments, and other thermally demanding telecom infrastructure deployments.
DS21348GB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
DS21348GB FAQ
1.How can I place an order for DS21348GB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21348GB 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 DS21348GB reliable?
The price and inventory of DS21348GB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21348GB is usually 5 days.
3.What payment methods are accepted for DS21348GB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21348GB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21348GB?
DS21348GB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21348GB 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 DS21348GB?
For technical support, including DS21348GB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21348GB requirements.
6.How does Aetrix verify that DS21348GB is sourced from the original manufacturer or authorized distributors?
All DS21348GB 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 DS21348GB meets industry standards.
7.What is the process for return or replacement of DS21348GB?
All DS21348GB units undergo pre-shipment inspection (PSI). If there is an issue with DS21348GB, 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 DS21348GB part is unused and in its original packaging.
Return procedure for DS21348GB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS21348GB Tags
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