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Microchip Technology AT49LW080-33JC
- Part No.:
- AT49LW080-33JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LW080-33JC.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
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Product details
Overview
AT49LW080-33JC from Microchip Technology is a 8-Mbit Firmware Hub (FWH) Flash memory IC designed for BIOS/firmware storage in Intel 8xx/E7xx/E8xx chipset platforms. It provides uniform 64-Kbyte sectors, dual-interface operation (FWH and A/A Mux), hardware write-protection via TBL and WP pins, and operates at 33 MHz with 3.3V I/O and 3.3V/12V VPP programming support.
For engineers reviewing the AT49LW080-33JC datasheet, AT49LW080-33JC pinout, AT49LW080-33JC application, or AT49LW080-33JC equivalent, key selection criteria include FWH interface compliance with Intel ICH, sector-level hardware/software lock control, LPC bus timing compatibility, and dual-voltage (3.3V/12V) VPP programmability for manufacturing vs. in-system use.
Technical Context
The AT49LW080-33JC implements a dual-mode interface architecture: Firmware Hub (FWH) mode uses a 5-signal synchronous interface (FWH[4:0], CLK, RST/INIT) compliant with Intel's LPC specification and synchronized to the 33 MHz PCI clock; Address/Address Multiplexed (A/A Mux) mode employs an 11-pin multiplexed address + 8-pin data interface with R/C control for high-speed factory programming.
Internally, a Command User Interface (CUI) arbitrates between interfaces and initiates automated byte-program and sector-erase operations. Sector locking combines hardware (TBL for top sector, WP for remaining sectors) and software-controlled register bits, with protection enforced regardless of register state when hardware pins are active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbits (1 Mbyte) arranged in sixteen 64-Kbyte uniform sectors - enables granular firmware partitioning and secure boot code isolation. |
| Interface Modes | Firmware Hub (FWH) for in-system operation; Address/Address Multiplexed (A/A Mux) for manufacturing programming - requires IC pin configuration at power-up/reset. |
| FWH Clock Speed | 33 MHz synchronous operation - matches standard PCI clock domain and ensures timing compatibility with Intel ICH chipsets. |
| VCC Supply | 3.3V ± 0.3V - supports low-power 3V platform designs; internal detection configures optimized read performance. |
| VPP Options | 3.3V (tied to VCC) for simple in-system design; 12V for fastest factory programming - 12V limited to ≤80 hours lifetime exposure. |
| Hardware Write Protection | Dedicated TBL (top sector only) and WP (all other sectors) pins - active-low, sampled at operation start; overrides software lock registers. |
| Package Type | 32-lead PLCC (J suffix) - industry-standard footprint compatible with legacy BIOS socket layouts and rework workflows. |
Pinout & Package
AT49LW080-33JC is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-bend leads, RoHS-compliant and halide-free. Pin functions are dual-mode: most pins serve distinct roles in FWH and A/A Mux modes, selected by the IC pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IC | Interface Configuration Input | Selects FWH (IC = low) or A/A Mux (IC = high) mode; must be set before power-up or reset - determines all subsequent pin behavior. |
| RST / INIT | Reset Inputs | Active-low dual-reset inputs (RST and INIT internally OR'd); tri-states FWH[3:0], resets sector locks to default locked state, aborts ongoing erase/program. |
| CLK | FWH Clock Input | 33 MHz PCI-synchronous clock input for FWH mode; in A/A Mux mode, functions as R/C (row/column address select). |
| FWH[4:0] | FWH Communication Signals | FWH4 = cycle start/abort indicator; FWH[3:0] = multiplexed command/address/data bus - requires TAR/SYNC protocol for reads/writes. |
| ID[3:0] | Firmware Device Identification | Strap pins used for device addressing on shared FWH bus; ID[3:0] = 0000 selects boot device - enables multi-device BIOS configurations. |
| TBL / WP | Hardware Write-Protect Inputs | TBL low locks top sector (sector 15); WP low locks sectors 0–14 - both override software lock registers and require stable state before operation start. |
| VPP | Program/Erase Power Supply | Accepts 3.3V (for low-power in-system use) or 12V (for high-throughput factory programming); internal circuitry detects VPP level and configures operation. |
| GNDa / VCCa | Analog Ground & Supply | Separate analog supply pair for internal charge pumps - must tie VCCa to VCC and GNDa to system ground plane to ensure reliable erase/program margin. |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub (FWH) Compliance | Fully compatible with Intel 82802AC/AB specifications and ICH-based LPC bus - enables direct replacement in legacy PC-BIOS platforms without firmware or hardware changes. |
| Dual-Interface Flexibility | Single die supports both in-system FWH operation (33 MHz, 5-signal) and high-speed A/A Mux programming (11+8 pin) - eliminates need for separate programming-only devices in manufacturing flow. |
| Hardware + Software Sector Locking | Independent TBL and WP pins enforce physical write-protection per sector group, while register-based locks allow dynamic runtime control - layered security for boot code integrity. |
| Uniform 64-Kbyte Sectors | Sixteen identically sized sectors simplify firmware update partitioning, reduce risk of partial corruption during field updates, and align with standard BIOS flash layout conventions. |
| Green Packaging | 32-lead PLCC package is Pb-free and halide-free - meets RoHS Directive 2011/65/EU and supports environmentally compliant industrial and commercial motherboard production. |
Applications
| Desktop Motherboard BIOS Storage | Industrial Control System Firmware |
|---|---|
|
Use Scenario: Storing boot firmware, POST routines, and hardware initialization code on x86-based desktop motherboards using Intel 8xx/E7xx chipsets. IC Role / Device Role / Timing Role: Firmware Hub (FWH) peripheral on LPC bus; responds to ICH-initiated read/write cycles at 33 MHz with TAR/SYNC handshaking. Use Value: Enables secure, field-updatable BIOS with hardware-enforced top-sector protection for critical boot code - prevents accidental or malicious overwrite during OS runtime. |
Use Scenario: Hosting firmware images and configuration data in ruggedized industrial PCs where long-term reliability and in-field update capability are required. IC Role / Device Role / Timing Role: Nonvolatile firmware storage device interfaced via FWH to embedded controller; leverages TBL/WP pins for tamper-resistant sector locking. Use Value: Supports certified firmware updates under IEC 62443 guidelines via register-based lock/unlock sequences, while hardware pins provide fail-safe protection during power interruption. |
| Server Platform Management Controller | OEM Manufacturing Programming |
|
Use Scenario: Providing persistent storage for BMC (Baseboard Management Controller) firmware in rack-mount servers requiring remote BIOS recovery and secure boot enforcement. IC Role / Device Role / Timing Role: FWH slave device on dedicated LPC segment; uses ID[3:0] strapping to coexist with main BIOS flash on same bus. Use Value: Allows independent firmware versioning and update scheduling for BMC and host BIOS - reduces system downtime during coordinated firmware rollouts. |
Use Scenario: Pre-programming BIOS images onto motherboards during high-volume OEM assembly using automated test equipment (ATE) and PROM programmers. IC Role / Device Role / Timing Role: A/A Mux mode device with 11-pin address multiplexing and R/C control - enables fast parallel programming of multiple units on test fixtures. Use Value: Reduces programming time by >40% versus serial ISP methods; 12V VPP option achieves full 8-Mbit erase/program in <100 ms per sector - increases factory throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Firmware Hub Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W39L080PZ | 8-Mbit FWH-compatible Flash in 32-lead PLCC; supports only 3.3V VPP (no 12V option); lacks FGPI[4:0] general-purpose inputs. | Valid for in-system FWH operation but unsuitable for high-speed 12V factory programming; no board-level GPIO extension capability. | Select when cost-sensitive designs prioritize simplicity over manufacturing flexibility and external GPIO needs. |
| SST39VF800A-70-4C-NHE | 8-Mbit parallel Flash in 48-TSOP; no FWH interface - requires LPC-to-parallel bridge IC; supports 70 ns access, single 3.3V supply. | Requires additional logic and PCB real estate; incompatible with native Intel ICH FWH handshake; suited for non-Intel or custom controller platforms. | Select only when migrating away from Intel chipset ecosystems or when legacy parallel interface infrastructure already exists. |
Compared with W39L080PZ and SST39VF800A-70-4C-NHE, the AT49LW080-33JC uniquely delivers native FWH compliance, dual-voltage VPP programmability, and five configurable FGPIs - making it the only choice for drop-in Intel 8xx/E7xx BIOS upgrades requiring both secure in-system operation and high-throughput manufacturing programming.
Availability
AT49LW080-33JC is available at Aetrix Electronics and suitable for desktop motherboard BIOS storage, industrial control system firmware, server BMC hosting, and OEM manufacturing programming requiring stable component supply across extended product lifecycles.
Supply support for AT49LW080-33JC 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 is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with a strong focus on embedded control and secure firmware technologies.
The AT49LW080-33JC belongs to Microchip's Firmware Hub Flash memory product line, engineered specifically for Intel-platform BIOS and firmware storage - emphasizing LPC bus compatibility, hardware-assisted security, and dual-mode manufacturability.
FAQ
What is the primary function of the AT49LW080-33JC in a PC platform?
The AT49LW080-33JC serves as a Firmware Hub (FWH) Flash memory device storing BIOS/firmware code for Intel 8xx/E7xx/E8xx chipset-based systems. It operates natively on the LPC bus, responding to ICH-initiated read/write cycles at 33 MHz. Its uniform 64-Kbyte sectors, hardware write-protection pins (TBL/WP), and dual-interface capability make it essential for secure, updatable boot firmware storage in the AT49LW080-33JC.
How does the IC pin affect the operation of the AT49LW080-33JC?
The IC pin determines the active interface mode of the AT49LW080-33JC: low selects Firmware Hub (FWH) mode for in-system operation; high selects Address/Address Multiplexed (A/A Mux) mode for manufacturing programming. This setting must be established before power-up or reset and cannot be changed dynamically. The IC pin's state defines all pin functionality - for example, CLK becomes R/C and FWH[4:0] become I/O or address lines - making correct IC configuration critical for AT49LW080-33JC integration.
Can the AT49LW080-33JC be programmed using only 3.3V, and what are the trade-offs?
Yes, the AT49LW080-33JC supports 3.3V-only programming by tying VPP to VCC, enabling simple, low-power in-system updates. However, this mode results in significantly slower sector erase and program times compared to 12V VPP operation. The 12V option delivers maximum factory throughput but is not recommended for standard in-system FWH use due to voltage stress limits (≤80 hours lifetime). Designers must choose based on use case: 3.3V for field updates, 12V for production - both valid for the AT49LW080-33JC.
What is the role of the TBL and WP pins on the AT49LW080-33JC?
The TBL (Top Boot Lock) and WP (Write Protect) pins provide hardware-enforced sector write protection for the AT49LW080-33JC. TBL low permanently locks sector 15 (top 64 Kbytes), typically reserved for boot code; WP low locks sectors 0–14. Both override software lock registers and are sampled at the start of each operation. Their states must be stable before initiating erase/program - changing them mid-operation may cause unpredictable behavior. This dual-pin scheme ensures robust, fail-safe protection for critical firmware in the AT49LW080-33JC.
Is the AT49LW080-33JC compatible with Intel's 82802AB/AC Firmware Hub specifications?
Yes, the AT49LW080-33JC is explicitly designed for compatibility with Intel 82802AB and 82802AC Firmware Hub devices in PC-BIOS applications. It replicates the FWH interface timing, command protocol (including START/IDSEL/MADDR fields), TAR/SYNC handshaking, and register mapping. The AT49LW080-33JC supports identical 33 MHz operation, ID[3:0] strapping, and hardware/software lock mechanisms - enabling direct drop-in replacement without BIOS or platform redesign.
AT49LW080-33JC 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:
- 8Mbit
- Memory Organization:
- 1M x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- 33 MHz
- Write Cycle Time - Word, Page:
- 300µs
- 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)
AT49LW080-33JC FAQ
1.How can I place an order for AT49LW080-33JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LW080-33JC 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 AT49LW080-33JC reliable?
The price and inventory of AT49LW080-33JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LW080-33JC is usually 5 days.
3.What payment methods are accepted for AT49LW080-33JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LW080-33JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LW080-33JC?
AT49LW080-33JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LW080-33JC 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 AT49LW080-33JC?
For technical support, including AT49LW080-33JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LW080-33JC requirements.
6.How does Aetrix verify that AT49LW080-33JC is sourced from the original manufacturer or authorized distributors?
All AT49LW080-33JC 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 AT49LW080-33JC meets industry standards.
7.What is the process for return or replacement of AT49LW080-33JC?
All AT49LW080-33JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LW080-33JC, 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 AT49LW080-33JC part is unused and in its original packaging.
Return procedure for AT49LW080-33JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LW080-33JC Tags
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