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Analog Devices Inc./Maxim Integrated DS21348GN
- Part No.:
- DS21348GN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 49-LFBGA, CSPBGA
- Datasheet:
-
DS21348GN.pdf
- Description:
- IC TELECOM INTERFACE 49CSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
DS21348GN 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 (75Ω/120Ω) and T1 (DSX-1/CSU) applications - deployed in telecom access nodes and channel service units.
For engineers reviewing the DS21348GN datasheet, DS21348GN pinout, DS21348GN application, or DS21348GN equivalent, key selection criteria include its 49-ball CSBGA package, -40°C to +85°C industrial temperature range, support for AMI/HDB3/B8ZS encoding, integrated 50mA RMS current limiter, and hardware/serial/parallel control interface flexibility.
Technical Context
The DS21348GN implements a dual-path jitter attenuator with selectable 32-bit or 128-bit depth, configurable in either transmit or receive data path, synchronized to a 2.048MHz (or 1.544MHz for T1) master clock. Its analog front-end includes automatic receive sensitivity adjustment (0dB to –43dB for E1, 0dB to –36dB for T1) and software-selectable internal termination.
It integrates full E1/T1 physical layer functions: G.703-compliant waveshaping with programmable line build-out (0dB, –7.5dB, –15dB, –22.5dB), bipolar/NRZ I/O, carrier loss detection per G.775, and in-band loop code generation/detection (1–16 bits). Control is supported via 8-bit parallel (muxed/non-muxed Intel/Motorola), serial (SPI-like), or hardware mode.
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 Rates | E1: 2.048Mbps; T1: 1.544Mbps - Fully compliant with ITU G.703 and ANSI T1.403-1999 physical layer requirements. |
| Jitter Attenuation | Crystal-less, 32-bit or 128-bit FIFO - Eliminates need for external VCXO; supports stable clock recovery using only MCLK. |
| Receive Sensitivity | E1: 0dB to –43dB; T1: 0dB to –36dB - Supports operation over 2.5km E1 cable (0.63mm) and 6k ft T1 cable. |
| Line Build-Out | E1: 75Ω/120Ω; T1: DSX-1/CSU (0dB, –7.5dB, –15dB, –22.5dB) - Matches legacy and modern trunk impedance profiles. |
| Encoding Support | AMI, HDB3 (E1), B8ZS (T1) - Ensures interoperability with global E1 and T1 network infrastructure. |
| Interface Modes | 8-bit parallel (Intel/Motorola, muxed/non-muxed), serial (3-wire), hardware control - Simplifies host MCU integration across diverse platform architectures. |
Pinout & Package
DS21348GN uses a 49-ball CSBGA package (7mm × 7mm, RoHS-compliant), rated for –40°C to +85°C operation. Pin assignments are identical to DS21348G/DS21348GN+ variants per Maxim's ordering table and pin description documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP / RRING | Analog Receive Input | Differential transformer-coupled inputs for E1/T1 line signal acquisition; support internal 75Ω/100Ω/120Ω termination. |
| TTIP / TRING | Analog Transmit Output | High-impedance differential outputs driving step-up transformer; include open-circuit detection and 50mA RMS current limiting. |
| RPOS / RNEG | Recovered Bipolar/NRZ Data | Edge-aligned (rising/falling RCLK) output of decoded line data; NRZ mode enables error pulse signaling on RNEG. |
| TPOS / TNEG | Transmit Data Input | Sampled on TCLK edge (configurable polarity); feed into B8ZS/HDB3 encoder and waveshaping circuitry. |
| RCLK | Recovered Line Clock | Buffered clock derived from line signal; used as timing reference for host interface and backplane clock synthesis. |
| BPCLK | Synthesized Backplane Clock | Programmable 16.384MHz/8.192MHz/4.096MHz/2.048MHz output referenced to RCLK - eliminates need for separate system clock source. |
| MCLK | Master Clock Input | 2.048MHz (±50ppm) TTL-level input; primary timing source for jitter attenuator and clock recovery; 1.544MHz optional for T1. |
| INT | Interrupt Output | Open-drain active-low flag for alarms (AIS, RCL, LOS), PRBS sync status, and error events - reduces polling overhead. |
| HRST | Hardware Reset | Active-low asynchronous reset that initializes all registers to default state (all zeros), ensuring deterministic startup. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less Jitter Attenuation | 32-bit or 128-bit FIFO eliminates external VCXO dependency while maintaining <1.5UI peak-to-peak jitter at E1/T1 rates. |
| Programmable Line Build-Out | Four discrete T1 CSU/DSX-1 settings (0dB, –7.5dB, –15dB, –22.5dB) and dual E1 impedance modes ensure compliance with regional G.703 templates. |
| Multi-Standard Encoding Engine | Single silicon supports AMI (T1/E1), HDB3 (E1), and B8ZS (T1) - enables unified hardware design for multi-region deployments. |
| Three Control Interface Options | Parallel (Intel/Motorola, muxed/non-muxed), serial (3-wire SPI-compatible), and hardware mode provide layout and firmware flexibility without gate-count penalty. |
| G.775 Carrier Loss Detection | Detects loss of valid line signal and asserts RCL/LOTC output within 2ms - meets ITU-T alarm propagation timing for operational monitoring. |
| PRBS Generation & Detection | On-chip 2¹⁵–1 and 2²⁰–1 pattern engine with PBEO output and register-based error counting - enables in-system link integrity validation without external test gear. |
Applications
| Channel Service Unit (CSU) | Telecom Access Node |
|---|---|
|
Use Scenario: Aggregating T1 circuits from central office to enterprise demarcation point with line monitoring and loopback support. IC Role / Device Role / Timing Role: Physical layer LIU performing clock recovery, B8ZS decoding, DSX-1 line build-out, and AIS alarm generation. Use Value: Enables single-chip CSU implementation with programmable termination and diagnostic loopbacks - reducing BOM count and board area by >40% vs. discrete solutions. |
Use Scenario: E1/T1 interface in DSLAM or MSAN shelf for legacy PSTN interconnection and backhaul. IC Role / Device Role / Timing Role: Full E1/T1 line driver and receiver with jitter attenuation, G.703 waveshaping, and RCLK-synchronized BPCLK for backplane synchronization. Use Value: Provides deterministic jitter performance (<0.5UI RMS) and seamless clock domain bridging between line and system clocks - eliminating external jitter cleaners. |
| Remote Terminal Unit (RTU) | Network Interface Device (NID) |
|
Use Scenario: Outdoor cabinet-based T1 termination with environmental resilience and remote diagnostics. IC Role / Device Role / Timing Role: Long-haul T1 LIU with CSU line build-out, carrier loss detection (G.775), and PRBS-based link verification. Use Value: Delivers -40°C to +85°C operation with integrated current limiting and open-circuit protection - enabling uncooled deployment in harsh environments. |
Use Scenario: Residential/business NID providing E1 handoff with in-band loop code support and AIS monitoring. IC Role / Device Role / Timing Role: E1 line interface with HDB3 decoding, 75Ω/120Ω termination selection, and 1–16 bit in-band loop code generation/detection. Use Value: Supports automated provisioning and fault isolation via standardized loop codes - reducing truck rolls and OPEX by enabling remote loopback testing. |
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 LIU in 144-ball CSBGA; shares same core architecture but scales channel count and package size. | Designed for multi-port CSU/MSAN cards requiring ≥4 E1/T1 interfaces; higher pin count and thermal footprint. | Select DS21Q348N when consolidating multiple DS21348GN instances onto one ASIC-like solution - reduces per-channel cost at scale. |
| DS2155 | Legacy 5V E1/T1 LIU with fixed 75Ω termination; lacks crystal-less jitter attenuator and programmable LBO. | Targets cost-sensitive, non-industrial designs where extended temperature range and advanced diagnostics are not required. | Choose DS2155 only for brownfield 5V systems with no upgrade path; DS21348GN offers superior jitter performance and 3.3V compatibility. |
Compared with DS21Q348N, DS21348GN provides optimal channel density for single-line applications with lower power and smaller footprint; versus DS2155, it delivers modern 3.3V operation, wider temperature range, and enhanced diagnostics - making it the preferred choice for new industrial telecom designs.
Availability
DS21348GN is available at Aetrix Electronics and suitable for telecom access nodes, channel service units, remote terminal units, and network interface devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS21348GN 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, industrial, and computing markets.
The DS21348GN belongs to Maxim's telecom line interface portfolio, engineered specifically for E1/T1/J1 physical layer interfacing in carrier-grade and industrial infrastructure equipment - emphasizing jitter resilience, standards compliance, and diagnostic completeness.
FAQ
What is the operating temperature range for the DS21348GN?
The DS21348GN is specified for industrial operation from –40°C to +85°C, validated per Maxim's datasheet ordering information and thermal characteristics section. This range supports deployment in uncontrolled environments such as outdoor cabinets and central office shelves. The 49-ball CSBGA package (7mm × 7mm) maintains thermal integrity under sustained load, with θJA measured at 36°C/W under 200LFM airflow. DS21348GN's guaranteed performance across this span makes it suitable for global telecom infrastructure applications.
Does the DS21348GN support both E1 and T1 standards simultaneously?
Yes, the DS21348GN supports both E1 and T1 standards - but not concurrently in the same configuration. Its ETS (E1/T1 Select) bit (CCR1.7) configures the device for either E1 (HDB3, 2.048MHz) or T1 (B8ZS, 1.544MHz) operation, determining receive sensitivity range, line build-out tables, and encoding/decoding behavior. The DS21348GN does not auto-detect line type; selection must be made at initialization. DS21348GN's dual-standard capability enables flexible reuse across regional deployments without hardware change.
What clock sources does the DS21348GN require for normal operation?
The DS21348GN requires a 2.048MHz ±50ppm TTL-level master clock (MCLK) for full E1/T1 functionality, including jitter attenuation and clock recovery. For T1-only applications, a 1.544MHz MCLK may be substituted. The device synthesizes BPCLK (16.384MHz/8.192MHz/4.096MHz/2.048MHz) from RCLK, eliminating need for additional system clocks. DS21348GN does not require an external crystal oscillator due to its integrated crystal-less jitter attenuator - simplifying bill-of-materials and layout.
How does the DS21348GN handle receive termination impedance selection?
The DS21348GN supports software-selectable internal receive termination of 75Ω, 100Ω, or 120Ω via CCR4 bits (Table 2-12), eliminating need for external resistors or jumpers. This setting applies to RTIP/RRING inputs and is independent of transmit line build-out configuration. External termination remains supported if preferred. DS21348GN's programmable termination allows field reconfiguration for different network segments (e.g., switching from 75Ω coaxial to 120Ω twisted-pair) without PCB modification - enhancing deployment flexibility.
Can the DS21348GN generate and detect in-band loop codes?
Yes, the DS21348GN fully supports in-band loop code generation and detection for lengths 1 to 16 bits, including CSU-specific loop codes. Loop-up and loop-down codes are controlled via dedicated registers (CCR3, CCR4) and monitored through status bits in RIR1. Detection is performed in real time on the recovered data stream, with interrupt assertion via INT pin. DS21348GN's loop code handling complies with ANSI T1.403 and ITU-T O.151, enabling standardized remote diagnostics and provisioning workflows.
DS21348GN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 49-LFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Interface:
- Serial
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 49-CSBGA (7x7)
DS21348GN FAQ
1.How can I place an order for DS21348GN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21348GN 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 DS21348GN reliable?
The price and inventory of DS21348GN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21348GN is usually 5 days.
3.What payment methods are accepted for DS21348GN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21348GN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21348GN?
DS21348GN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21348GN 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 DS21348GN?
For technical support, including DS21348GN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21348GN requirements.
6.How does Aetrix verify that DS21348GN is sourced from the original manufacturer or authorized distributors?
All DS21348GN 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 DS21348GN meets industry standards.
7.What is the process for return or replacement of DS21348GN?
All DS21348GN units undergo pre-shipment inspection (PSI). If there is an issue with DS21348GN, 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 DS21348GN part is unused and in its original packaging.
Return procedure for DS21348GN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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