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Analog Devices Inc./Maxim Integrated DS1852B-000/T&R
- Part No.:
- DS1852B-000/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 25-LFBGA, CSPBGA
- Datasheet:
-
DS1852B-000/T&R.pdf
- Description:
- IC INTERFACE SPECIALIZED 25BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,360
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Product details
Overview
DS1852B-000/T&R from Maxim Integrated is a fiber-optic transceiver diagnostic monitor IC implementing SFF-8472 at device address A2h. It integrates a 4-input muxing ADC, direct-to-digital temperature sensor, three temperature-compensated fast comparators, 127-byte EEPROM (security level 1), and 2-wire interface for host communication in optical modules operating from 3V or 5V supply across –40°C to +100°C.
For engineers reviewing the DS1852B-000/T&R datasheet, DS1852B-000/T&R pinout, DS1852B-000/T&R application, or DS1852B-000/T&R equivalent, key selection criteria include SFF-8472 compliance readiness, analog input scaling calibration (Bin/Pin/Rin/VCC), fast alarm response (<10µs), 25-ball BGA package compatibility, and security-level access control for EEPROM programming.
Technical Context
The DS1852B-000/T&R implements a rotating 5-channel ADC (internal VCC/temperature + external Bin/Pin/Rin) with 12-bit effective resolution, updated every 13ms nominal. Its 3-input muxing fast comparator provides temperature-dependent trip points-eight unique values for Bin, four for Pin/Rin-with 8-bit programmable thresholds (10mV–2.5V range, ~10mV/LSB).
It supports dual-mode 2-wire operation (100kHz standard / 400kHz fast mode), uses open-drain SDA/SCL, and features three-tiered security (User/Level 1/Level 2) with factory-default passwords and write-only 4-byte password entry at addresses 7Bh–7Eh in Table 00h.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.7V to +5.5V - supports both 3V and 5V systems without level-shifting |
| Operating Temp | –40°C to +100°C - qualified for industrial-grade optical transceiver module environments |
| ADC Resolution | 16-bit readout, 12-bit effective - upper 12 bits valid; lower 4 bits undefined |
| Temperature Accuracy | ±1°C over –10°C to +70°C - calibrated internal sensor with signed 15-bit output format |
| Fast Comparator Speed | <10µs response - enables real-time fault detection on bias, TX power, and RX power inputs |
| EEPROM Capacity | 127 bytes (Level 1), 128 bytes (Level 2) - stores calibration data, alarm thresholds, and identity tables per SFF-8472 |
| 2-Wire Interface | Standard (100kHz) and Fast Mode (400kHz) - compatible with host controllers supporting either speed |
Pinout & Package
DS1852B-000/T&R is housed in a 5×5 mm, 25-ball BGA package with 0.8mm pitch. Ball layout follows top-view labeling (A–E rows, 1–5 columns). NC balls are electrically isolated and must not be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (D2, D4, E3) | Power supply input | Three dedicated power pins reduce IR drop and improve noise immunity in high-speed optical modules |
| GND (B3, C2, C4, D3) | Ground reference | Four ground balls provide low-inductance return path for analog and digital sections |
| SDA (B5) | 2-wire serial data | Open-drain I/O requiring external pull-up; supports wire-OR with other slave devices on same bus |
| SCL (A5) | 2-wire serial clock | Input-only clock line synchronized to host controller; defines timing for all read/write operations |
| Bin (A3) | Analog bias current input | Monitors laser diode bias current; scaled full-scale range configurable from 0.2V to 6.5535V via EEPROM |
| Pin (D1) | Analog TX power input | Measures transmitted optical power; shares same ADC architecture and scaling as Bin/Rin |
| Rin (A2) | Analog RX power input | Tracks received optical power level; used for link health monitoring and automatic power control |
| ASEL (B2) | Address select | Logic-high configures device address to A2h (SFF-8472 default); logic-low sets address to A0h |
| Din (C5) | Digital TX disable input | Mirrored into memory map (Table 00h, byte 6Eh) for host status polling without interrupt |
| RSin (B4) | Digital rate select input | Indicates data rate mode (e.g., 1G/2.5G/10G); enables dynamic configuration of alarm thresholds |
| Fin (E5) | Digital TX fault input | Signals laser fault condition; latched in memory map for post-fault diagnostics |
| Lin (A1) | Digital LOS input | Reports loss-of-signal event; critical for fail-safe shutdown and alarm escalation |
Key Features
| Feature | Design Value |
|---|---|
| SFF-8472 Compliance Support | Hardware-ready implementation at A2h address; requires external A0h EEPROM for full GBIC-compliant identity table storage |
| Temperature-Compensated Fast Comparators | Three independent comparators with 8-bit programmable thresholds and temperature-dependent trip-point selection (8 bins for Bin, 4 for Pin/Rin) |
| Calibratable ADC Scaling | 16-bit per-channel scaling factor (4 coarse + 12 fine bits) stored in Table 03h EEPROM enables precise full-scale alignment from 0.2V to 6.5535V |
| Three-Tier Security Architecture | User (read-only), Level 1 (customer data), Level 2 (full access); passwords stored in protected EEPROM with write-only entry at 7Bh–7Eh |
| Low-Power Standby Mode | Automatically entered after stop condition or internal operation completion; reduces quiescent current during idle periods |
Applications
| Fiber Channel Transceivers | SFP Modules |
|---|---|
Use Scenario: Real-time monitoring of laser bias current, TX optical power, and ambient temperature inside 1G/2G FC transceivers. IC Role / Device Role / Timing Role: Diagnostic monitor IC providing calibrated ADC readings, fast fault detection, and EEPROM-stored calibration data per SFF-8472. Use Value: Enables closed-loop bias control and predictive failure analysis using temperature-compensated alarm thresholds on Bin and Pin channels. | Use Scenario: Host-side digital diagnostics for hot-pluggable SFP modules in enterprise switches and routers. IC Role / Device Role / Timing Role: Slave device on 2-wire bus reporting real-time analog measurements and digital status (LOS, TX_FAULT) to host microcontroller. Use Value: Delivers standardized SFF-8472-compliant telemetry without requiring external ADC or comparator components. |
| XFP Optical Modules | Active Optical Cables (AOC) |
Use Scenario: Monitoring high-speed 10G optical transmitter performance under varying thermal conditions. IC Role / Device Role / Timing Role: Integrated analog front-end and alarm engine performing sub-10µs fault detection on Rin and Pin while maintaining full SFF-8472 register mapping. Use Value: Supports rapid fault isolation during link training and enables temperature-adaptive thresholding to maintain BER stability. | Use Scenario: Embedded diagnostics in active optical cables used in HPC and AI cluster interconnects. IC Role / Device Role / Timing Role: Compact BGA-mounted monitor IC providing calibrated voltage, temperature, and digital status to cable management MCU. Use Value: Reduces bill-of-materials by integrating ADC, comparator, EEPROM, and 2-wire interface in single 5×5 mm footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optical transceiver monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX32660ETK+ | ARM Cortex-M4 MCU with integrated ADC, no native SFF-8472 register map; requires firmware implementation of memory map and alarm logic | Used where custom diagnostics, firmware updates, or multi-protocol support (e.g., CMIS) are required beyond SFF-8472 scope | Select when flexibility and future protocol extension outweigh fixed-function simplicity |
| DS1859-000 | Legacy Dallas part with identical pinout and SFF-8472 support but lacks temperature-compensated fast comparators and has only 64-byte EEPROM | Deployed in cost-sensitive, legacy 1G modules where advanced alarm features are unused | Select only for backward-compatible replacement where existing PCB layout and firmware rely on DS1859 behavior |
Compared with DS1852B-000/T&R, MAX32660ETK+ offers programmability at the cost of increased design effort and validation time, while DS1859-000 provides pin compatibility but omits temperature-aware fast alarms and half the EEPROM capacity needed for full SFF-8472 calibration data storage.
Availability
DS1852B-000/T&R is available at Aetrix Electronics and suitable for fiber channel transceivers, SFP modules, and XFP optical modules requiring stable component supply, long-term lifecycle support, and SFF-8472-compliant diagnostics.
Supply support for DS1852B-000/T&R 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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The DS1852B-000/T&R belongs to Maxim's optical transceiver monitor product line, engineered specifically to meet SFF-8472 diagnostic requirements in pluggable fiber modules with minimal external components.
FAQ
What is the primary function of the DS1852B-000/T&R in an optical transceiver?
The DS1852B-000/T&R serves as a diagnostic monitor IC that implements SFF-8472 functionality for fiber-optic transceivers. It measures temperature, supply voltage, laser bias current (Bin), transmitted optical power (Pin), and received optical power (Rin) via its integrated ADC, provides fast temperature-compensated alarm detection, and communicates results over a 2-wire interface. The DS1852B-000/T&R also manages EEPROM-based calibration data and security access levels to support standardized digital diagnostics in pluggable modules.
Does the DS1852B-000/T&R require an external EEPROM to comply with SFF-8472?
Yes, the DS1852B-000/T&R requires an external EEPROM at device address A0h to store the IEEE-compliant identity table and full SFF-8472 memory map. While the DS1852B-000/T&R contains 127–128 bytes of internal EEPROM for calibration and settings, the standard mandates 256-byte identity table storage at A0h, which is outside the DS1852B-000/T&R's internal memory capacity. The DS1852B-000/T&R itself operates at A2h per specification.
What are the key differences between the fast comparators and high-resolution alarm comparators in the DS1852B-000/T&R?
The DS1852B-000/T&R features two distinct comparator systems: three temperature-compensated fast comparators (<10µs response) with 8-bit programmable thresholds for Bin, Pin, and Rin - optimized for immediate fault detection; and ten high-resolution alarm comparators (five analog channels × high/low pairs) with 16-bit setpoints aligned to ADC output format - intended for precise, software-configurable thresholding. The DS1852B-000/T&R allows both types to coexist, enabling layered diagnostics: fast comparators trigger immediate hardware responses, while high-resolution alarms feed host-based analytics.
How does the DS1852B-000/T&R handle security access and password protection?
The DS1852B-000/T&R implements three-tiered security: User (default, read-only), Manufacturer Level 1 (customer data access), and Manufacturer Level 2 (full memory and feature access). Access is granted by writing a 4-byte password to addresses 7Bh–7Eh in Table 00h. Level 1 password resides at D3h–D6h in Table 03h; Level 2 is factory-programmed and write-protected. Both passwords default to 00h, and the DS1852B-000/T&R treats the password entry register as write-only - no readback is possible for security enforcement.
Is the DS1852B-000/T&R pin-compatible with earlier Dallas Semiconductor transceiver monitors?
Yes, the DS1852B-000/T&R maintains identical 25-ball BGA pinout and electrical interface compatibility with the DS1859-000 and DS1852-000, including VCC, GND, SDA, SCL, Bin, Pin, Rin, ASEL, Din, RSin, Fin, Lin, and NC ball assignments. This allows drop-in replacement in existing layouts. However, firmware must account for enhanced features in the DS1852B-000/T&R - notably expanded EEPROM capacity, temperature-compensated fast comparators, and updated memory map addressing - to fully utilize its capabilities.
DS1852B-000/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 25-LFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Monitors
- Interface:
- 2-Wire
- Voltage - Supply:
- 2.7V ~ 5.5V
- Supplier Device Package:
- 25-CSBGA (5x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
DS1852B-000/T&R FAQ
1.How can I place an order for DS1852B-000/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1852B-000/T&R 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 DS1852B-000/T&R reliable?
The price and inventory of DS1852B-000/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1852B-000/T&R is usually 5 days.
3.What payment methods are accepted for DS1852B-000/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1852B-000/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1852B-000/T&R?
DS1852B-000/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1852B-000/T&R 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 DS1852B-000/T&R?
For technical support, including DS1852B-000/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1852B-000/T&R requirements.
6.How does Aetrix verify that DS1852B-000/T&R is sourced from the original manufacturer or authorized distributors?
All DS1852B-000/T&R 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 DS1852B-000/T&R meets industry standards.
7.What is the process for return or replacement of DS1852B-000/T&R?
All DS1852B-000/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1852B-000/T&R, 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 DS1852B-000/T&R part is unused and in its original packaging.
Return procedure for DS1852B-000/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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