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Microchip Technology AT49LW080-33TC
- Part No.:
- AT49LW080-33TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LW080-33TC.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LW080-33TC from Microchip Technology is a 8-Mbit Firmware Hub (FWH) Flash memory IC designed for PC BIOS applications, compatible with Intel 82802AC/AB chipsets. 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 AT49LW080-33TC datasheet, AT49LW080-33TC pinout, AT49LW080-33TC application, or AT49LW080-33TC equivalent, this page delivers verified interface timing, sector-locking behavior, FWH protocol compliance, LPC bus integration details, and package-specific pin mapping for TSOP-40 and PLCC-32 variants - critical for BIOS firmware storage, motherboard bring-up, and secure platform initialization.
Technical Context
The AT49LW080-33TC implements a dual-mode hardware interface: Firmware Hub (FWH) for in-system operation with PCI-compliant 33 MHz synchronous communication, and Address/Address Multiplexed (A/A Mux) for manufacturing programming using 11-pin multiplexed address + 8-pin data. Interface selection is controlled by the IC pin at power-up or reset.
Internally, a Command User Interface (CUI) coordinates between both interfaces and the nonvolatile memory core. Sector erase and byte-program operations are fully automated; hardware write protection is enforced independently via TBL (top boot sector) and WP (all other sectors) pins, while register-based locking remains active but overridden when hardware pins are asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbits (1 Mbyte) organized as sixteen 64-Kbyte uniform sectors - enables modular BIOS code partitioning and selective firmware updates. |
| Interface Modes | Firmware Hub (FWH): 5-signal, 33 MHz synchronous interface compliant with Intel ICH; A/A Mux: 11-pin multiplexed address + 8-pin data for fast OEM programming - supports both runtime and factory workflows. |
| Voltage Supply | VCC = 3.3V ± 0.3V; VPP = 3.3V or 12V - 12V enables fastest programming throughput; 3.3V VPP allows simplified single-rail 3V system design with VCC/VPP tied. |
| Write Protection | Dual hardware pins: TBL (active-low top-sector lock) and WP (active-low lock for sectors 0–14); independent of software registers - ensures fail-safe BIOS protection during power transitions. |
| Timing Compliance | FWH interface synchronized to 33 MHz PCI clock; supports single-byte read/write cycles with TAR/SYNC handshaking - guarantees deterministic latency for chipset-initiated BIOS access. |
| Package Options | 40-lead TSOP-II and 32-lead PLCC - industry-standard footprints compatible with legacy motherboard layouts and automated assembly. |
| Environmental | Green (Pb/Halide-free) packaging option available - meets RoHS Directive 2011/65/EU requirements for commercial and industrial platforms. |
Pinout & Package
AT49LW080-33TC is offered in two industry-standard packages: 40-lead TSOP-II (thin small-outline package) and 32-lead PLCC (plastic leaded chip carrier). The "-33TC" suffix denotes the 33 MHz FWH timing grade and TSOP-40 package variant per Microchip's ordering nomenclature. Pin functions are shared across both packages with mode-dependent roles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IC | Interface Configuration Input | Selects FWH (IC = low) or A/A Mux (IC = high) mode at power-up/reset; internal pull-down resistor (20–100 kΩ) ensures default FWH operation if floated. |
| FWH[3:0], FWH4 | FWH Data/Control Bus | 5-signal multiplexed interface: FWH[3:0] carries command/address/data; FWH4 signals cycle start/abort - enables full LPC bus integration with Intel ICH. |
| TBL, WP | Hardware Write-Protect Inputs | TBL locks only sector 15 (top boot); WP locks sectors 0–14; both sampled at operation start - provides physical-layer BIOS integrity independent of software state. |
| ID[3:0] | Firmware Hub Device ID Inputs | Strap pins used for multi-device bus arbitration; ID = 0000 selects boot device - required for correct FWH enumeration in multi-chip BIOS configurations. |
| CLK | 33 MHz Synchronous Clock Input | PCI-compliant clock input for FWH mode; identical to system PCI clock - eliminates need for local oscillator and ensures timing alignment with chipset. |
| VPP | Program/Erase Power Supply | Accepts 3.3V (for low-power 3V systems) or 12V (for maximum factory programming speed); internal detection configures erase/program logic accordingly. |
| RST / INIT | Reset Inputs | Asynchronous reset inputs that tri-state outputs, abort ongoing operations, and restore sector-lock registers to default locked state - essential for safe system reboot and recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub (FWH) Interface | Full Intel-compatible 5-signal interface supporting x8 reads/writes at 33 MHz - enables direct integration with I/O Controller Hubs without translation logic or glue components. |
| Dual-Mode Hardware Interface | Single die supports both in-system FWH operation and high-speed A/A Mux programming - eliminates need for separate development and production memory parts. |
| Hardware + Register Write Protection | TBL and WP pins enforce physical-layer sector locking, overriding software register settings - prevents accidental or malicious BIOS corruption even if firmware security is compromised. |
| Uniform 64-Kbyte Sectors | 16 identically sized sectors simplify firmware partitioning, update management, and recovery image placement - aligns with UEFI firmware volume layout standards. |
| General-Purpose Inputs (FGPI[4:0]) | Five configurable inputs readable via FWH registers - provide board-level flexibility for strapping options, revision detection, or platform-specific configuration without additional GPIO controllers. |
Applications
| PC BIOS Storage | Server Platform Initialization |
|---|---|
|
Use Scenario: Storing and executing core BIOS/UEFI firmware on desktop and laptop motherboards. IC Role / Device Role / Timing Role: Primary nonvolatile firmware hub interfacing directly with Intel ICH via FWH protocol; provides boot code at system power-on reset. Use Value: Ensures deterministic 33 MHz FWH read access with TAR/SYNC handshaking, enabling reliable CPU initialization and early-boot sequence execution. |
Use Scenario: Secure firmware storage for rack-mount servers requiring remote management and firmware rollback capability. IC Role / Device Role / Timing Role: Dual-role Flash device: A/A Mux mode for pre-programming at ODM, FWH mode for runtime firmware updates and secure boot verification. Use Value: Hardware write-protection (TBL/WP) prevents unauthorized modification of boot firmware during BMC-initiated updates or out-of-band management. |
| Industrial Control Panel Boot | Embedded Thin Client Firmware |
|
Use Scenario: Reliable firmware storage in fanless industrial PCs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Nonvolatile BIOS memory with 3.3V-only operation (VCC = VPP) and robust reset handling (RST/INIT) for unattended operation. Use Value: Eliminates need for 12V programming supply, reducing BOM count and improving long-term reliability in thermally constrained enclosures. |
Use Scenario: Firmware storage in space-constrained thin clients where footprint and power efficiency are critical. IC Role / Device Role / Timing Role: Compact 32-lead PLCC-packaged Flash memory supporting both boot code and configuration data storage. Use Value: PLCC-32 footprint enables manual rework and socket-based firmware replacement - simplifies field service and version upgrades without PCB rework. |
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 W39L080P70Z | Same 8-Mbit density, FWH-compatible interface, but uses 70 ns access time and lacks dedicated FGPI inputs - no general-purpose input register support. | Supports basic BIOS storage but not platform-level strapping or revision detection features enabled by FGPI[4:0]. | Select when only core FWH functionality is needed and board-level GPIO extension is unnecessary. |
| SST39VF800A-70-4I-WHE | LPC-compatible Flash with 8-Mbit capacity, but implements standard LPC interface instead of Intel FWH - requires different chipset handshake and lacks TBL/WP hardware protection pins. | Suitable for non-Intel platforms or legacy LPC designs, but incompatible with Intel 8XX/E7XX/E8XX chipset FWH signaling and protection architecture. | Choose only for non-Intel host controllers or when migrating from older LPC-based BIOS architectures. |
Compared with W39L080P70Z and SST39VF800A-70-4I-WHE, the AT49LW080-33TC uniquely combines Intel FWH protocol compliance, dual hardware write-protection pins (TBL/WP), five FGPIs for board-level flexibility, and seamless A/A Mux programming support - making it the only drop-in solution for Intel chipset-based BIOS designs requiring secure, field-upgradable firmware storage.
Availability
AT49LW080-33TC is available at Aetrix Electronics and suitable for PC motherboard manufacturing, server platform initialization, and industrial control panel boot applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant green packaging.
Supply support for AT49LW080-33TC 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 devices, and memory solutions, with a strong focus on embedded control and secure firmware infrastructure.
The AT49LW080-33TC belongs to Microchip's Firmware Hub Flash memory product line, engineered specifically for Intel-platform BIOS/UEFI storage with dual-interface flexibility, hardware-enforced write protection, and industrial-grade reliability.
FAQ
What is the primary function of the AT49LW080-33TC in a PC platform?
The AT49LW080-33TC serves as the Firmware Hub (FWH) Flash memory for storing and executing BIOS/UEFI firmware in Intel-based platforms. It interfaces directly with the I/O Controller Hub via the 5-signal FWH protocol, providing secure, low-latency access to boot code during system power-on and reset sequences. Its hardware write-protection pins (TBL and WP) ensure critical firmware remains immutable during runtime.
Does the AT49LW080-33TC support both 3.3V and 12V programming voltages?
Yes, the AT49LW080-33TC supports dual VPP operation: 3.3V for simplified single-rail 3V system designs (with VCC and VPP tied), and 12V for maximum factory programming speed. Internal VPP detection automatically configures the device for sector erase and program operations. Note that 12V VPP must not exceed 80 hours total over the device lifetime.
How does the IC pin determine interface mode on the AT49LW080-33TC?
The IC pin selects between Firmware Hub (FWH) and Address/Address Multiplexed (A/A Mux) modes: IC = low enables FWH mode for in-system operation; IC = high enables A/A Mux mode for manufacturing programming. This setting must be established before power-up or reset and cannot be changed dynamically during operation. An internal 20–100 kΩ pull-down resistor ensures FWH mode if IC is left floating.
What is the role of the TBL and WP pins on the AT49LW080-33TC?
TBL (Top Boot Lock) and WP (Write Protect) are dedicated hardware inputs that enforce physical-layer write protection: TBL locks only sector 15 (the top 64-Kbyte boot sector), while WP locks all remaining sectors (0–14). Both pins override software-configurable sector-lock registers, ensuring BIOS integrity even if firmware-level protections are compromised. Their state is sampled at the start of each program/erase operation.
Can the AT49LW080-33TC be used in systems without an Intel chipset?
The AT49LW080-33TC is specifically designed for Intel 8XX, E7XXX, and E8XXX chipset compatibility and implements the Intel Firmware Hub (FWH) protocol. While its A/A Mux interface supports generic programming, full FWH functionality-including 33 MHz synchronous timing, TAR/SYNC handshaking, and IDSEL-based device selection-requires an Intel ICH-compatible host controller. Use in non-Intel systems is not supported.
AT49LW080-33TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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-TSOP
AT49LW080-33TC FAQ
1.How can I place an order for AT49LW080-33TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LW080-33TC 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 AT49LW080-33TC reliable?
The price and inventory of AT49LW080-33TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LW080-33TC is usually 5 days.
3.What payment methods are accepted for AT49LW080-33TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LW080-33TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LW080-33TC?
AT49LW080-33TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LW080-33TC 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 AT49LW080-33TC?
For technical support, including AT49LW080-33TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LW080-33TC requirements.
6.How does Aetrix verify that AT49LW080-33TC is sourced from the original manufacturer or authorized distributors?
All AT49LW080-33TC 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 AT49LW080-33TC meets industry standards.
7.What is the process for return or replacement of AT49LW080-33TC?
All AT49LW080-33TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LW080-33TC, 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 AT49LW080-33TC part is unused and in its original packaging.
Return procedure for AT49LW080-33TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LW080-33TC Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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