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Microchip Technology AT49LH002-33JC
- Part No.:
- AT49LH002-33JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LH002-33JC.pdf
- Description:
- IC FLASH 2MBIT PAR 33MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
AT49LH002-33JC from Microchip Technology (formerly Atmel) is a 2-Mbit Firmware Hub (FWH) and Low-Pin Count (LPC) Flash memory IC designed for PC and notebook BIOS storage. It supports Intel LPC Interface Specification Rev. 1.1, operates at 3.0–3.6 V, features dual-interface operation (FWH/LPC and A/A Mux), and provides hardware write protection via TBL and WP pins for top-boot and main sectors.
For engineers reviewing the AT49LH002-33JC datasheet, AT49LH002-33JC pinout, AT49LH002-33JC application, or AT49LH002-33JC equivalent, key selection considerations include LPC/FWH interface auto-detection, flexible sector erase configurations (16-KB top boot + mixed sectors or four uniform 64-KB sectors), 33 MHz PCI clock synchronization, and dual-package support (32-lead PLCC and 40-lead TSOP).
Technical Context
The AT49LH002-33JC implements a dual-mode interface architecture controlled by the IC pin: low enables FWH/LPC mode for in-system operation with 5-signal bus (FWH4/LFRAME + FWH/LAD[3:0]), high enables A/A Mux mode for manufacturing programming using 11-pin multiplexed address and 8-pin data lines. Its Command User Interface (CUI) orchestrates command execution across both interfaces.
It supports two distinct erase configurations - one yielding seven sectors (16-KB top boot, two 8-KB, one 32-KB, three 64-KB) and another yielding four uniform 64-KB sectors - with TBL pin hardware protection applying either to the 16-KB region or the uppermost 64-KB region depending on the issued erase command. Sector Locking Registers provide additional register-based read/write protection per sector.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 K × 8) nonvolatile Flash array optimized for BIOS code storage |
| Interface Standard | Complies with Intel LPC Interface Spec Rev. 1.1; supports both FWH and LPC memory cycles |
| Supply Voltage | 3.0 V to 3.6 V single supply - eliminates need for separate VPP programming voltage |
| Operating Clock | 33 MHz PCI bus clock - ensures timing compatibility with Intel 8xx/E7xxx/E8xxx chipsets |
| Sector Architecture | Configurable: seven sectors (16K+8K+8K+32K+64K×3) or four uniform 64K sectors - maximizes BIOS memory utilization |
| Hardware Protection | TBL pin protects top boot sector (16K or 64K); WP pin protects all other sectors - enables secure firmware update partitioning |
| Package Type | 32-lead PLCC (J-lead ceramic) - RoHS-compliant, through-hole mountable for legacy BIOS designs |
Pinout & Package
AT49LH002-33JC is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC) with J-shaped leads, pin-compatible with industry-standard socketed BIOS Flash sockets. The device supports dual interface modes selected by the IC pin, resulting in shared pin functionality between FWH/LPC and A/A Mux modes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IC | Interface Configuration Control | Low = FWH/LPC mode (in-system); High = A/A Mux mode (manufacturing programming); internal pull-down ensures default LPC operation if unconnected |
| FWH4/LFRAME | LPC Frame Initiation/Abort | Indicates start/end of FWH/LPC cycle; used as WE in A/A Mux mode - critical for cycle synchronization and timeout handling |
| FWH/LAD[3:0] | 4-bit Multiplexed Bus | Carries addresses, commands, and data in FWH/LPC mode; functions as I/O[3:0] in A/A Mux mode - enables compact 5-signal interface |
| TBL | Top Boot Sector Lock | Hardware write-protects top 16 KB or top 64 KB depending on erase command - prevents accidental BIOS corruption during updates |
| WP | Write Protect | Hardware disables writes to all non-top-boot sectors - complements TBL for layered BIOS protection strategy |
| ID[3:0] | Firmware Hub Device ID | Strappable inputs for multi-device FWH bus addressing (ID=0000 required for boot device) - enables system-level firmware redundancy |
| GPI[4:0] | General-Purpose Inputs | Five user-configurable inputs readable via GPI register - supports board-specific configuration detection or status monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Auto-detect FWH/LPC cycles | Eliminates external mode-select logic - device interprets START field (1101b/1110b/0000b) to self-configure interface behavior |
| Flexible sector erase options | Two erase command sets enable optimal BIOS layout: mixed-size sectors reduce wasted space; uniform 64-KB sectors simplify update partitioning |
| Dual-interface architecture | Single die supports both in-system FWH/LPC operation and high-speed A/A Mux programming - reduces BOM count and test complexity |
| Fixed program/erase timing | Timing independence from cumulative P/E cycles removes need for system-level wear calibration or dynamic timing adjustment |
| PCI-compliant buffers | Ensures signal integrity and timing compliance when interfacing directly with 33 MHz PCI bus - no external level-shifting required |
Applications
| Legacy PC BIOS Storage | Industrial Embedded Controller Boot |
|---|---|
Use Scenario: Storing core BIOS firmware in desktop motherboards using Intel 8xx-series chipsets. IC Role / Device Role / Timing Role: Firmware Hub (FWH) device responding to chipset-initiated memory read/write cycles over LPC bus at 33 MHz. Use Value: Hardware TBL/TP protection prevents corruption of boot code during field updates; auto-detection of FWH cycles ensures plug-and-play compatibility. | Use Scenario: Providing secure, field-upgradable boot code for ruggedized industrial controllers with long product lifecycles. IC Role / Device Role / Timing Role: LPC Flash memory operating in non-Intel chipset environments, leveraging LPC memory cycle protocol for firmware access. Use Value: Dual-interface support allows factory programming via A/A Mux and in-field updates via LPC - reducing service logistics overhead. |
| Notebook Platform Firmware | Embedded Systems Manufacturing Test |
Use Scenario: Hosting UEFI firmware modules in space-constrained notebook platforms requiring reliable boot integrity. IC Role / Device Role / Timing Role: Top-boot protected Flash storing critical initialization routines; GPI pins monitor platform-specific strap states during power-on. Use Value: 16-KB top-boot sector with dedicated TBL pin enables atomic firmware recovery - essential for zero-touch remote provisioning. | Use Scenario: High-volume programming of BIOS images during motherboard assembly using automated handlers. IC Role / Device Role / Timing Role: A/A Mux interface mode activated via IC pin for fast parallel programming of memory array and sector locking registers. Use Value: 11-pin multiplexed address + 8-pin data interface enables rapid out-of-system programming - cutting test floor cycle time vs. serial methods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Firmware Hub and LPC Flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W29GL032C | 32-Mbit density, supports 1.8V/3.3V dual supply; lacks TBL pin and FWH auto-detection logic | Targeted at newer embedded platforms with lower voltage rails; not drop-in compatible for legacy FWH boot sequences | Select only when migrating to higher-density, lower-voltage designs with updated chipset support |
| Macronix MX29LV320ET | 32-Mbit, 3.0–3.6V operation; uses standard JEDEC CFI interface instead of LPC/FWH; no ID[3:0] or GPI pins | Designed for generic Flash applications without chipset-specific firmware hub requirements; requires host-side command translation | Choose for cost-sensitive, non-Intel-platform designs where LPC protocol compliance is unnecessary |
Compared with W29GL032C and MX29LV320ET, the AT49LH002-33JC uniquely delivers Intel-certified FWH/LPC interface compliance, hardware top-boot protection, and dual-interface flexibility - making it irreplaceable in legacy PC BIOS systems requiring guaranteed boot sequence integrity and in-system update security.
Availability
AT49LH002-33JC is available at Aetrix Electronics and suitable for legacy PC motherboard production, industrial controller BIOS replacement, and embedded system firmware upgrade programs requiring stable component supply and long-term obsolescence management.
Supply support for AT49LH002-33JC 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
Microchip Technology acquired Atmel in 2016 and maintains full technical and supply chain support for legacy Atmel Flash products including the AT49LH002 series.
The AT49LH002 product line was specifically engineered for Intel-platform BIOS firmware storage, emphasizing LPC/FWH protocol fidelity, hardware-based sector protection, and dual-interface programmability to meet PC industry boot reliability and manufacturing efficiency requirements.
FAQ
What interface protocols does the AT49LH002-33JC support?
The AT49LH002-33JC supports both Intel Firmware Hub (FWH) and Low-Pin Count (LPC) memory cycles per Revision 1.1 of the LPC Interface Specification. It automatically detects the cycle type based on the START field (1101b for FWH read, 1110b for FWH write, 0000b for LPC memory) and operates accordingly. The device also supports the Address/Address Multiplexed (A/A Mux) interface for manufacturing programming, selected via the IC pin.
How does hardware write protection work on the AT49LH002-33JC?
The AT49LH002-33JC implements two independent hardware write protection mechanisms: the TBL (Top Boot Lock) pin protects the top 16-KB or top 64-KB sector depending on the active erase command, while the WP (Write Protect) pin safeguards all remaining sectors. Both pins function independently of sector locking registers, providing fail-safe protection against unintended firmware modification during power-up, reset, or software errors - a critical feature for BIOS integrity in the AT49LH002-33JC.
What is the purpose of the IC pin on the AT49LH002-33JC?
The IC (Interface Configuration) pin on the AT49LH002-33JC selects between its two operational modes: when held low, the device enables the FWH/LPC interface for in-system operation; when driven high, it activates the A/A Mux interface for manufacturing programming. The pin has an internal pull-down resistor (20–100 kΩ), so it defaults to FWH/LPC mode if left unconnected - simplifying design for systems that exclusively use in-system firmware updates in the AT49LH002-33JC.
Can the AT49LH002-33JC be used with non-Intel chipsets?
Yes, the AT49LH002-33JC can operate as an LPC Flash memory device with non-Intel chipsets by responding to LPC memory cycles (START = 0000b). While its FWH mode is optimized for Intel 8xx/E7xxx/E8xxx chipsets, the device's LPC compatibility allows integration into AMD, VIA, or custom south-bridge designs that implement the LPC memory protocol - maintaining full read/write functionality without requiring Intel-specific FWH handshake logic in the AT49LH002-33JC.
What sector erase configurations does the AT49LH002-33JC support?
The AT49LH002-33JC supports two distinct sector erase configurations selectable via different command sequences: one yields seven sectors (16-KB top boot, two 8-KB, one 32-KB, three 64-KB), optimizing BIOS code placement; the other yields four uniform 64-KB sectors, simplifying firmware partitioning and update management. The TBL pin's protection scope changes accordingly - covering either the 16-KB top boot region or the entire uppermost 64-KB sector - a key architectural feature of the AT49LH002-33JC.
AT49LH002-33JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- 33 MHz
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49LH002-33JC FAQ
1.How can I place an order for AT49LH002-33JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LH002-33JC 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 AT49LH002-33JC reliable?
The price and inventory of AT49LH002-33JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LH002-33JC is usually 5 days.
3.What payment methods are accepted for AT49LH002-33JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LH002-33JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LH002-33JC?
AT49LH002-33JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LH002-33JC 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 AT49LH002-33JC?
For technical support, including AT49LH002-33JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LH002-33JC requirements.
6.How does Aetrix verify that AT49LH002-33JC is sourced from the original manufacturer or authorized distributors?
All AT49LH002-33JC 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 AT49LH002-33JC meets industry standards.
7.What is the process for return or replacement of AT49LH002-33JC?
All AT49LH002-33JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LH002-33JC, 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 AT49LH002-33JC part is unused and in its original packaging.
Return procedure for AT49LH002-33JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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