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Analog Devices Inc./Maxim Integrated DS21Q43-ATN
- Part No.:
- DS21Q43-ATN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 128-LQFP
- Datasheet:
-
DS21Q43-ATN.pdf
- Description:
- IC TELECOM INTERFACE 128LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,734
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Product details
Overview
DS21Q43-ATN from Maxim Integrated (now part of Analog Devices) is a quad E1 framing transceiver IC designed for CEPT/PCM-30 and ISDN-PRI telecommunication line cards. It integrates four fully independent E1 framers, supports FAS/CAS/CCS/CRC4 framing formats, delivers 2.048 MHz primary clocks per channel, and operates at 5 V with industrial temperature range (–40°C to +85°C). Used in multi-E1 access gateways and TDM multiplexers.
For engineers reviewing the DS21Q43-ATN datasheet, DS21Q43-ATN pinout, DS21Q43-ATN application, or DS21Q43-ATN equivalent, this page provides verified technical context, exact pin functions per framer, real-world timing roles in CAS signaling extraction, elastic store configuration for asynchronous backplanes up to 8.192 MHz, and validated alternatives for E1 framer migration paths.
Technical Context
The DS21Q43-ATN implements four independent E1 framers-each with dual two-frame elastic stores enabling synchronous/asynchronous backplane interfacing up to 8.192 MHz. Each framer supports full CAS signaling insertion/extraction, CRC4 error detection, and FAS word alignment per ITU-T G.704/G.706/G.962 and ETS 300 011/233.
It features a shared 8-bit parallel control port configurable for multiplexed or non-multiplexed buses, with Motorola/Intel timing support via BTS pin. Framers are selected via FS0/FS1 inputs, preserving register compatibility with the single-channel DS2143-enabling reuse of existing driver software with minimal modification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| E1 Channels | Four independent E1 framers, each handling full 2.048 Mbps PCM-30/CEPT framing |
| Framing Standards | Fully compliant with ITU-T G.704, G.706, G.962, I.431 and ETSI ETS 300 011/233 |
| Control Interface | 8-bit parallel port with framer-select (FS0/FS1), bus-type select (BTS), and MUX mode for Intel/Motorola timing |
| Elastic Store | Dual two-frame elastic stores per framer, supporting asynchronous backplane clocking up to 8.192 MHz |
| Signaling Support | CAS and CCS signaling extraction/insertion; Sa/Si bit access; per-channel loopback (RSER→TSER) |
| Alarm Handling | Automatic AIS generation on loss of frame sync; remote alarm and multiframe alarm detection/generation |
| Supply & Temp | 5.0 V ± 0.5 V operation; industrial grade –40°C to +85°C (confirmed by DS21Q43ATN suffix) |
Pinout & Package
DS21Q43-ATN is housed in a 128-pin TQFP package (14 mm × 14 mm, 0.5 mm pitch), with dedicated transmit/receive signal groups per framer, shared control bus, and multiple power/ground pins distributed for noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TCLK0–TCLK3 | Transmit Clock Input (x4) | 2.048 MHz primary clock per framer; required for transmit formatter and control port timing |
| RCLK0–RCLK3 | Receive Clock Input (x4) | 2.048 MHz primary clock per framer; required for receive synchronizer and control port timing |
| TSER0–TSER3 / RSER0–RSER3 | Transmit/Receive Serial Data (x4 each) | NRZ serial data I/O; sampled on TCLK/RCLK falling/rising edges (elastic store disabled) or TSYSCLK/RSYSCLK (enabled) |
| TPOS0–TPOS3 / TNEG0–TNEG3 | Transmit Bipolar Output (x4 pairs) | Outputs HDB3-encoded bipolar signals; programmable for NRZ via TCR1.7 |
| RPOS0–RPOS3 / RNEG0–RNEG3 | Receive Bipolar Input (x4 pairs) | Accepts bipolar line signals; sampled on RCLK falling edge; tie together for NRZ mode |
| FS0, FS1 | Framer Select Inputs | Selects active framer (0–3) for register access via shared parallel control port |
| CS, RD, WR, MUX, BTS | Parallel Bus Control | Enables Intel/Motorola timing, multiplexed/non-multiplexed mode, chip select, and read/write strobes |
| INT | Interrupt Output | Active-low open-drain interrupt flagging status changes across all four framers |
Key Features
| Feature | Design Value |
|---|---|
| Quad Independent Framers | No shared framing synchronizer-each framer operates autonomously with separate transmit/receive paths and elastic stores |
| Per-Channel Elastic Store | Enables connection to asynchronous backplanes up to 8.192 MHz; independently enabled/disabled per framer |
| CAS Signaling Extraction | Direct access to Sa/Si bits and timeslot 16; supports ETSI-compliant CAS monitoring and insertion |
| Programmable Alarm Generation | Hardware-based AIS, remote alarm, and remote multiframe alarm generation without host CPU intervention |
| Pin Compatibility | Pin-compatible with DS21Q41B Quad T1 Framer-enabling board-level reuse in mixed T1/E1 platforms |
| Error Monitoring Counters | Dedicated hardware counters for BPV/CV, CRC4 errors, FAS word errors, and E-bits-updated every 62.5 ms or 1 s |
Applications
| Multi-E1 Access Gateway | E1 Line Card for PBX |
|---|---|
Use Scenario: Aggregating four E1 lines into a single TDM backplane for VoIP gateway or media gateway chassis. IC Role / Device Role / Timing Role: DS21Q43-ATN acts as framing interface and CAS signaling processor-extracting channel-associated signaling from timeslot 16 and aligning frames to system clock domain. Use Value: Enables deterministic jitter management via dual elastic stores; supports per-framer loopback for field diagnostics without external test equipment. |
Use Scenario: Embedded E1 interface card in enterprise PBX systems requiring ISDN-PRI support and D-channel signaling. IC Role / Device Role / Timing Role: DS21Q43-ATN serves as physical layer framer-handling FAS alignment, CRC4 validation, and D-channel (timeslot 16) CAS bit extraction for call setup/teardown. Use Value: Hardware-accelerated AIS generation ensures rapid link failure notification; programmable TCHBLK outputs enable precise channel blocking for H0/H12 fractional services. |
| TDM Multiplexer Backplane | Legacy Network Edge Router |
Use Scenario: Interfacing legacy E1 transport to packet-switched core using TDM-over-IP bridging. IC Role / Device Role / Timing Role: DS21Q43-ATN performs frame synchronization and elastic store buffering-absorbing clock domain mismatches between line-side E1 and backplane-side synchronous TDM fabric. Use Value: Dual two-frame elastic stores per framer provide sufficient latency margin for 8.192 MHz backplane clocking while maintaining G.704 alignment integrity. |
Use Scenario: Edge router supporting leased-line E1 connectivity for branch office WAN aggregation. IC Role / Device Role / Timing Role: DS21Q43-ATN functions as E1 framer and alarm monitor-detecting RLOS, AIS, and remote alarms to trigger failover or SNMP traps. Use Value: Integrated RLOS/LOTC dual-function output simplifies fault isolation; hardware CRC4 resync status bit enables fast recovery without firmware polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar E1 framer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q41B | T1-focused quad framer; supports 1.544 MHz T1 framing only; no E1-specific registers or CAS handling logic | Designed for North American T1 infrastructure; lacks E1-specific features like CRC4, FAS, or Sa/Si bit access | Choose DS21Q41B only for pure T1 deployments; not suitable for CEPT/E1 or ISDN-PRI where DS21Q43-ATN's E1 compliance is mandatory |
| SI2155-C-GM | Single-port E1 framer with integrated line interface; includes HDB3 encoder/decoder and transformer drive; no quad integration | Reduces BOM count for single-E1 designs but requires four instances to match DS21Q43-ATN channel count; higher layout area and power | Prefer SI2155-C-GM for space-constrained single-E1 nodes; DS21Q43-ATN remains optimal for multi-E1 density and shared control bus efficiency |
Compared with DS21Q41B and SI2155-C-GM, DS21Q43-ATN uniquely delivers four E1 framers with full ITU-T G.704/G.706 compliance, hardware CAS processing, and elastic store support in one 128-pin TQFP-reducing PCB footprint by >60% versus discrete solutions and enabling direct migration from DS2143-based designs.
Availability
DS21Q43-ATN is available at Aetrix Electronics and suitable for multi-E1 access gateways, telecom line cards, TDM multiplexers, and legacy network edge routers requiring stable component supply and long-term industrial-grade availability.
Supply support for DS21Q43-ATN 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
Analog Devices (via acquisition of Maxim Integrated) designs high-performance analog, mixed-signal, and RF ICs for precision signal conditioning, timing, and communication infrastructure.
The DS21Q43-ATN belongs to Maxim's legacy telecom framer product line, engineered specifically for carrier-grade E1 line interface units, ISDN-PRI termination, and TDM over packet transport systems requiring deterministic framing and low-latency signaling.
FAQ
What is the operating voltage and temperature range for DS21Q43-ATN?
The DS21Q43-ATN operates from a single 5.0 V ± 0.5 V supply and is rated for industrial temperature range of –40°C to +85°C, as confirmed by the "ATN" suffix in the part number and datasheet Section 1. This makes DS21Q43-ATN suitable for uncontrolled telecom cabinet environments where thermal stability is critical.
How does DS21Q43-ATN handle CAS signaling extraction from E1 timeslot 16?
DS21Q43-ATN provides dedicated hardware access to Sa and Si bits within timeslot 16 via RLINK/TLINK interfaces and registers R30–R3F (Receive Signaling) and T40–T4F (Transmit Signaling). The device extracts CAS bits directly from the received E1 stream and allows per-channel insertion-fully compliant with ETSI ETS 300 011 for CAS-based telephony switching.
Is DS21Q43-ATN pin-compatible with any other Maxim quad framers?
Yes, DS21Q43-ATN is explicitly pin-compatible with the DS21Q41B Quad T1 Framer, as stated in the datasheet Features section. This allows reuse of PCB layouts across T1 and E1 platforms-though firmware must be adapted for E1-specific framing (FAS/CRC4) versus T1 (SF/ESF) and signaling protocols.
What clock frequencies does DS21Q43-ATN support for elastic store operation?
DS21Q43-ATN supports elastic store operation with either 1.544 MHz or 2.048 MHz system clocks (TSYSCLK/RSYSCLK), selectable per framer via RCR2.2 and TCR2.2 bits. When enabled, the elastic store buffers data to accommodate asynchronous backplane clocking up to 8.192 MHz-critical for TDM fabric interconnects.
Does DS21Q43-ATN support automatic AIS generation on loss of frame sync?
Yes, DS21Q43-ATN includes hardware-based automatic AIS generation triggered by loss of frame synchronization, controlled by CCR2.5 (AAIS bit). When enabled, the device asserts AIS pattern on TPOS/TNEG outputs without host CPU involvement-ensuring rapid network-layer fault indication per ITU-T G.704 Section 5.2.
DS21Q43-ATN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 128-LQFP
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Interface:
- Parallel/Serial
- Number of Circuits:
- 4
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 32mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 128-LQFP (14x20)
DS21Q43-ATN FAQ
1.How can I place an order for DS21Q43-ATN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21Q43-ATN 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 DS21Q43-ATN reliable?
The price and inventory of DS21Q43-ATN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21Q43-ATN is usually 5 days.
3.What payment methods are accepted for DS21Q43-ATN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21Q43-ATN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21Q43-ATN?
DS21Q43-ATN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21Q43-ATN 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 DS21Q43-ATN?
For technical support, including DS21Q43-ATN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21Q43-ATN requirements.
6.How does Aetrix verify that DS21Q43-ATN is sourced from the original manufacturer or authorized distributors?
All DS21Q43-ATN 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 DS21Q43-ATN meets industry standards.
7.What is the process for return or replacement of DS21Q43-ATN?
All DS21Q43-ATN units undergo pre-shipment inspection (PSI). If there is an issue with DS21Q43-ATN, 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 DS21Q43-ATN part is unused and in its original packaging.
Return procedure for DS21Q43-ATN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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