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Analog Devices Inc./Maxim Integrated DS26524G
- Part No.:
- DS26524G
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 256-LBGA, CSBGA
- Datasheet:
-
DS26524G.pdf
- Description:
- IC TELECOM INTERFACE 256CSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,560
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Product details
Overview
DS26524G from Maxim Integrated is a quad-channel T1/E1/J1 framer and line interface unit (LIU) IC for telecom infrastructure. It integrates four independent transceivers, supports D4/ESF/T1, G.704/CRC-4/E1, and J1 framing, operates from 0°C to +70°C, and uses a 256-ball TE-CSBGA package. It enables T1-to-E1 conversion and crystal-less jitter attenuation compliant with ITU-T G.823 and ETSI CTR 12/13 in routers, CSUs, and channel banks.
For engineers reviewing the DS26524G datasheet, DS26524G pinout, DS26524G application, or DS26524G equivalent, key selection criteria include per-port framer/LIU integration, software-selectable 75Ω/100Ω/110Ω/120Ω termination, receive-signal level indication (–2.5dB to –44dB), T1/E1/J1 mode independence, and H.100 (CT Bus) backplane interface compatibility.
Technical Context
The DS26524G implements four fully independent framer-LIU channels, each configurable for T1 (1.544MHz), E1 (2.048MHz), or J1 line rates with selectable framing (D4, SLC-96, ESF for T1; G.704/CRC-4 for E1). Each channel includes transmit synchronizer, alarm detection/insertion, and flexible signaling extraction via microprocessor or system interface.
Its clock architecture supports external master clocks at multiples of 1.544MHz or 2.048MHz, internally adapted for host-mode T1/E1 operation. The integrated crystal-less jitter attenuator meets ITU-T G.736/G.742/G.823 and AT&T Pub 62411, and operates on either transmit or receive path with programmable gain and bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent T1/E1/J1 transceivers with integrated framer and LIU |
| Operating Temp | 0°C to +70°C - suitable for commercial telecom equipment environments |
| Package | 256-ball TE-CSBGA - 11mm × 11mm footprint with fine-pitch interconnect for high-density backplane designs |
| Jitter Attenuation | Crystal-less, meets ITU-T G.823 and ETSI CTR 12/13 - eliminates need for external VCXO or PLL in timing-critical line cards |
| Rx Signal Level Range | –2.5dB to –36dB (T1), –2.5dB to –44dB (E1) in ~2.5dB steps - enables precise loss monitoring without external ADC |
| Termination Support | Software-selectable 75Ω (E1 coax), 100Ω (T1 twisted pair), 110Ω (J1), 120Ω (E1 twisted pair) - single BOM covers multiple physical layer standards |
| Framing Formats | T1: D4, SLC-96, ESF; E1: G.704 with CRC-4 multiframe; J1: full support - ensures interoperability across North America, Europe, and Japan networks |
Pinout & Package
DS26524G is housed in a 256-ball TE-CSBGA (56-G6028-001) package with 0.8mm ball pitch, designed for thermal and signal integrity in telecom line cards. Pin functions are defined per the official Maxim DS26524 datasheet Section 7.1 and Figure 14-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Power Supply | 3.3V supply for parallel bus interface (Intel/Motorola modes) and control logic |
| VDDA | Analog Core Supply | 3.3V supply for LIU analog circuitry including transmitter drivers and receiver front-end |
| REFCLK | Reference Clock Input | Accepts 1.544MHz or 2.048MHz master clock; used for internal clock synthesis and jitter attenuation reference |
| BPCLK | Backplane Clock Output | Provides synchronized 1.544MHz/2.048MHz clock to TDM backplane; supports H.100 CT Bus timing compliance |
| RSYNC | Receive Sync Input | Frame synchronization input for backplane interface in H.100 mode; aligns elastic store read/write pointers |
| TSSYNCIO | Transmit Sync I/O | Bidirectional sync signal for transmit-side frame alignment in CT Bus applications |
| MDIO/MDC | Management Interface | IEEE 802.3-compliant MDIO/MDC interface for configuration and status register access |
| JTAG_TCK/TMS/TDI/TDO | Boundary Scan Test | IEEE 1149.1-compliant test access port for production testing and debug |
Key Features
| Feature | Design Value |
|---|---|
| T1-to-E1 Conversion | Enables protocol-transparent bridging between T1 and E1 networks without external mapping logic or FPGA glue |
| Per-Port Termination Selection | Eliminates discrete resistor networks and manual BOM variants - one DS26524G design supports global line interface standards |
| Crystal-Less Jitter Attenuation | Reduces bill-of-materials count and board space by removing external VCXO, loop filter, and associated passive components |
| H.100 (CT Bus) Compatibility | Direct integration into legacy and modern telephony switching fabrics without custom clock domain crossing logic |
| Transmit Open/Short-Circuit Detection | Enables automated line fault diagnostics and reduces field service time for CSU/DSU and mux deployments |
| Programmable In-Band Loop Code | Supports standardized T1 loopback testing (ANSI T1.403) using embedded framer logic - no external pattern generator required |
Applications
| Routers | Channel Service Units (CSUs) |
|---|---|
|
Use Scenario: Aggregating multiple T1/E1 lines into IP backbone at edge or core router line cards. IC Role / Device Role / Timing Role: Framer-LIU transceiver providing physical layer framing, line drive/receive, and jitter cleanup before packetization. Use Value: Single-chip integration reduces latency variance and eliminates inter-chip skew between framer and LIU stages. |
Use Scenario: Providing T1 line conditioning, framing, and alarm reporting in carrier-class CSUs deployed at customer premises. IC Role / Device Role / Timing Role: Line interface controller with LOS detection (G.775), RSL monitoring, and D4/ESF framing compliance. Use Value: Meets Telcordia GR-1244-CORE requirements for signal level reporting and alarm insertion without external supervision logic. |
| Data Service Units (DSUs) | T1/E1 Test Equipment |
|
Use Scenario: Converting T1 data streams to V.35 or RS-530 interfaces in enterprise DSUs. IC Role / Device Role / Timing Role: Physical layer transceiver with T1 transmit synchronizer and receive elastic store for clock recovery and slip management. Use Value: Supports gapped clock mode for fractional TDM mapping, enabling seamless integration with asynchronous host processors. |
Use Scenario: Portable or rack-mounted testers verifying line integrity, framing accuracy, and error performance per ANSI T1.102 and ITU-T O.150. IC Role / Device Role / Timing Role: Bit-error-rate test (BERT) engine with programmable pattern generation and error counting per channel. Use Value: On-chip BERT eliminates need for external pattern generators and simplifies calibration traceability in metrology-grade instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad T1/E1 framer-LIU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2155 | Single-port T1/E1 framer-LIU; no J1 support; no crystal-less jitter attenuator; requires external clock synthesis | Limited to point-to-point T1/E1 links; not suitable for multi-port aggregation or J1-compliant Japanese networks | Select DS2155 only when cost-sensitive single-channel designs and simpler clocking are prioritized over integration and global standard coverage. |
| Si5338A | Clock generator with jitter cleaning (not framer/LIU); no T1/E1 framing, line driving, or signaling logic | Used for system-level clock distribution-not a line interface device; cannot replace DS26524G's physical layer functions | Si5338A complements but does not substitute DS26524G; consider only as auxiliary jitter cleaner in hybrid architectures where DS26524G handles framing and line interface. |
Compared with DS2155 and Si5338A, the DS26524G uniquely delivers full quad-channel T1/E1/J1 framer-LIU integration with embedded jitter attenuation, eliminating both discrete framer+LIU pairing and external clock conditioning-critical for compact, standards-compliant line card designs.
Availability
DS26524G is available at Aetrix Electronics and suitable for routers, channel service units (CSUs), data service units (DSUs), multiplexers, and T1/E1 test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for DS26524G 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 power management ICs for communications, computing, and industrial systems.
The DS26524G belongs to Maxim's telecom line interface portfolio, engineered specifically for carrier-grade T1/E1/J1 framer-LIU consolidation in space-constrained, thermally demanding line cards and network access equipment.
FAQ
What is the operating temperature range for the DS26524G?
The DS26524G is rated for commercial operation from 0°C to +70°C. This range aligns with standard environmental requirements for central office edge equipment and enterprise telecom gear. The DS26524G+ variant shares identical thermal specs but adds lead-free/RoHS compliance. Temperature grade is fixed per orderable part number and cannot be modified post-manufacture.
Does the DS26524G support both T1 and E1 framing simultaneously across its four ports?
Yes, the DS26524G supports independent framing mode selection per channel: any combination of T1 (D4/SLC-96/ESF), E1 (G.704/CRC-4), and J1 can be active concurrently. This capability is implemented in hardware and configured via register writes - no shared resources or mode conflicts exist between ports, enabling true multi-standard line cards.
What termination impedances does the DS26524G support, and how are they selected?
The DS26524G supports 75Ω (E1 coax), 100Ω (T1 twisted pair), 110Ω (J1), and 120Ω (E1 twisted pair) line terminations. Selection is software-controlled per channel via dedicated LIU configuration registers - no external resistors or hardware strapping required. This allows dynamic reconfiguration during operation or field upgrade without PCB changes.
Is the DS26524G pin-compatible with other devices in the DS265xx family?
No, the DS26524G is not pin-compatible with earlier DS265xx variants such as DS26518 or DS26504. While all share the 256-ball TE-CSBGA package, pin assignments for clock, data, and control signals differ significantly due to architectural enhancements including H.100 interface support and expanded register mapping. Migration requires PCB redesign and firmware adaptation.
How does the crystal-less jitter attenuator in the DS26524G meet ITU-T G.823 specifications?
The DS26524G's crystal-less jitter attenuator uses an all-digital phase-locked loop with adaptive bandwidth control and programmable loop filter coefficients. It achieves <0.2 UI peak-to-peak jitter (12 kHz–20 MHz band) on both transmit and receive paths, satisfying ITU-T G.823 Table 1 requirements for plesiochronous network elements without external crystal or VCXO components.
DS26524G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 256-LBGA, CSBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Line Interface Unit (LIU)
- Interface:
- LIU
- Number of Circuits:
- 4
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 260mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-CSBGA (17x17)
DS26524G FAQ
1.How can I place an order for DS26524G through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26524G 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 DS26524G reliable?
The price and inventory of DS26524G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26524G is usually 5 days.
3.What payment methods are accepted for DS26524G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26524G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26524G?
DS26524G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26524G 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 DS26524G?
For technical support, including DS26524G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26524G requirements.
6.How does Aetrix verify that DS26524G is sourced from the original manufacturer or authorized distributors?
All DS26524G 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 DS26524G meets industry standards.
7.What is the process for return or replacement of DS26524G?
All DS26524G units undergo pre-shipment inspection (PSI). If there is an issue with DS26524G, 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 DS26524G part is unused and in its original packaging.
Return procedure for DS26524G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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