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Microchip Technology AT49LW080-33JC-T
- Part No.:
- AT49LW080-33JC-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LW080-33JC-T.pdf
- Description:
- IC FLASH 8MBIT PAR 33MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,540
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Product details
Overview
AT49LW080-33JC-T from Microchip Technology is a 8-Mbit Firmware Hub (FWH) Flash memory IC designed for BIOS code storage in Intel 8xx/E7xx/E8xx chipset platforms. It features 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-T datasheet, AT49LW080-33JC-T pinout, AT49LW080-33JC-T application, or AT49LW080-33JC-T equivalent, key selection criteria include FWH interface compatibility with Intel ICH, sector-level hardware/software lock control, 32-lead PLCC package footprint, and dual-voltage VPP flexibility for manufacturing vs. in-system use.
Technical Context
The AT49LW080-33JC-T implements a dedicated Firmware Hub interface compliant with Intel's LPC bus specification, using five signals (FWH[3:0], FWH4, CLK, RST/INIT) for synchronous 33 MHz communication with the I/O Controller Hub. Its internal Command User Interface (CUI) arbitrates between FWH and A/A Mux modes based on the IC pin state at power-up or reset.
In FWH mode, it supports only single-byte read/write cycles with preamble-based addressing (28-bit address, IDSEL matching to ID[3:0]), TAR/SYNC handshaking, and register-accessible GPIs and lock status. In A/A Mux mode, it provides 11-pin multiplexed address + 8-pin data programming interface with R/C-controlled row/column latching and RY/BY status output - but no FWH registers, security features, or GPI access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbits (1 MByte) organized as sixteen 64-Kbyte uniform sectors - enables granular firmware partitioning and field-upgrade safety. |
| Interface Modes | Firmware Hub (FWH) for in-system operation; Address/Address Multiplexed (A/A Mux) for factory programming - selected by IC pin at power-up/reset. |
| FWH Clock Speed | 33 MHz synchronous with PCI clock - ensures timing alignment with Intel chipsets without additional clock domain crossing logic. |
| VPP Supply Options | 3.3V (for low-power 3V systems, VCC/VPP tied) or 12V (for fastest factory programming) - supports both embedded platform constraints and high-throughput manufacturing. |
| Hardware Write Protection | Dual independent pins: TBL (top sector only) and WP (all other sectors) - provides physical layer protection against accidental corruption of boot code or system firmware. |
| Operating Voltage | VCC = 3.3V ± 0.3V - compatible with standard 3.3V platform power rails and eliminates need for level-shifting circuitry. |
| Package Type | 32-lead PLCC (J-lead ceramic) - industry-standard footprint for socketed BIOS Flash replacement and legacy motherboard compatibility. |
Pinout & Package
AT49LW080-33JC-T is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-shaped leads, pin 1 marked by corner notch. The package supports socketed installation and rework-friendly thermal profile.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| IC | Interface Configuration Input | Selects FWH (low) or A/A Mux (high) mode at power-up/reset; internal 20–100 kΩ pull-down ensures default FWH operation if floated. |
| RST / INIT | Reset Input (dual-function) | Resets internal automation, tri-states FWH[3:0], locks all sectors by default; internally OR'd - either pin asserts full reset behavior. |
| CLK | 33 MHz System Clock Input | Synchronizes FWH interface to PCI clock domain; must match phase and skew of host ICH clock for reliable handshaking. |
| FWH[3:0] | Multiplexed I/O Bus | Carries FWH preamble (START, IDSEL), address, data, and SYNC/TAR signals; PCI-compliant buffers enable direct connection to ICH. |
| FWH4 | Cycle Start/Abort Indicator | Signals start of new FWH cycle or abort condition; allows peripherals to enter low-power states when inactive. |
| ID[3:0] | Device Identification Inputs | Strapable 4-bit ID for multi-device FWH bus; boot device requires ID=0000; internal pull-downs allow floating for default configuration. |
| TBL / WP | Hardware Write-Protect Inputs | TBL protects top sector (sector 15); WP protects sectors 0–14; sampled at operation start - changes during erase/program cause undefined behavior. |
| FGPI[4:0] | General-Purpose Inputs | Five board-flexibility inputs readable via FWH registers; require stable 3.3V levels before and during read cycles; must not float. |
| VPP | Program/Erase Power Supply | Accepts 3.3V (tied to VCC) or 12V (for fast factory programming); internal detection configures erase/program logic accordingly. |
| GNDa / VCCa | Analog Ground / Power | Separate analog supply pair for internal charge pumps; must be tied to same plane as digital GND/VCC to minimize noise coupling into flash core. |
Key Features
| Feature | Design Value |
|---|---|
| Firmware Hub Interface Compliance | Fully compatible with Intel 82802AC/AB FWH specification - enables drop-in replacement in existing 8xx/E7xx/E8xx platform designs without firmware or hardware modification. |
| Dual-Mode Hardware Interface | Single die supports both in-system runtime (FWH) and high-speed manufacturing programming (A/A Mux) - eliminates need for separate development and production parts. |
| Hardware + Software Sector Locking | TBL/WP pins provide physical-layer protection; sector-lock registers offer fine-grained software control - layered security prevents unauthorized firmware modification at multiple levels. |
| Uniform 64-Kbyte Sectors | 16 identical sectors simplify firmware partitioning, recovery image management, and over-the-air update logic - avoids complex address translation across irregular block sizes. |
| PCI-Compliant I/O Buffers | FWH[3:0] drivers meet PCI electrical specs - ensures signal integrity and timing margin when interfacing directly with Intel ICH without external bus transceivers. |
| Green Packaging Option | Pb/Halide-free PLCC construction meets RoHS Directive 2011/65/EU - supports environmental compliance for industrial and commercial PC platforms. |
Applications
| Desktop Motherboard BIOS Storage | Industrial Control System Firmware |
|---|---|
|
Use Scenario: Storing boot firmware, ACPI tables, and platform 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 with 33 MHz synchronous timing and TAR/SYNC handshaking. Use Value: Enables secure, field-upgradable BIOS with hardware write-protection for top boot sector - preventing corruption during power loss or failed updates. |
Use Scenario: Hosting real-time firmware and configuration data in ruggedized industrial PCs deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage device with dual-interface support - FWH for runtime execution, A/A Mux for offline reprogramming during maintenance windows. Use Value: Uniform 64-Kbyte sectors allow atomic firmware patching; TBL/WP pins ensure critical startup code remains immutable during unattended remote updates. |
| Embedded Server Platform Boot ROM | Legacy Embedded System Upgrade Path |
|
Use Scenario: Providing boot firmware for entry-level rack-mounted servers using E8xx-series chipsets where BIOS size and reliability are critical. IC Role / Device Role / Timing Role: Primary FWH device on LPC bus; ID[3:0]=0000 strapping identifies it as boot source; supports single-byte reads/writes per Intel FWH spec. Use Value: 3.3V-only operation (with VPP tied to VCC) simplifies power design; 32-lead PLCC package allows socketed replacement for BIOS recovery without soldering. |
Use Scenario: Replacing obsolete Intel 82802AB devices in long-lifecycle embedded systems requiring extended component availability. IC Role / Device Role / Timing Role: Pin-compatible Firmware Hub Flash memory with identical PLCC-32 footprint and FWH protocol behavior - no PCB or firmware changes required. Use Value: Direct functional equivalence to Intel 82802AB/AC ensures seamless migration; green packaging supports updated environmental compliance requirements. |
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 |
|---|---|---|---|
| Intel 82802AB | Original reference FWH device; identical 8-Mbit density, PLCC-32 package, and FWH interface timing - but discontinued and subject to obsolescence risk. | Same boot ROM role in Intel 8xx platforms; requires identical ID[3:0] strapping and VPP configuration. | Use only for legacy repair; lacks green packaging and current Microchip technical support. |
| Winbond W39L080PZ | 8-Mbit FWH-compatible Flash in 32-lead PLCC; supports FWH and A/A Mux modes; differs in GPI count (4 vs. 5) and VPP detection threshold. | Valid for BIOS storage in same chipset families; requires validation of GPI register mapping and VPP voltage tolerance in target design. | Consider when sourcing diversity is required; verify RY/BY behavior and sector lock register layout against AT49LW080-33JC-T. |
Compared with Intel 82802AB, AT49LW080-33JC-T offers active lifecycle support and RoHS compliance; compared with Winbond W39L080PZ, it provides an additional GPI and tighter VPP voltage specification - making it preferable for designs requiring maximum pin-for-pin compatibility and long-term supply assurance.
Availability
AT49LW080-33JC-T is available at Aetrix Electronics and suitable for desktop motherboard BIOS storage, industrial control system firmware, embedded server boot ROM, and legacy platform upgrade applications requiring stable component supply and long-term manufacturability.
Supply support for AT49LW080-33JC-T 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 connectivity.
The AT49LW080-33JC-T belongs to Microchip's Firmware Hub Flash memory product line, engineered specifically for secure, standards-compliant BIOS and platform firmware storage in Intel x86 chipset-based systems.
FAQ
What is the primary function of the AT49LW080-33JC-T in a PC platform?
The AT49LW080-33JC-T serves as a Firmware Hub (FWH) Flash memory device storing BIOS/UEFI firmware for Intel 8xx, E7xx, and E8xx chipset platforms. It interfaces directly with the I/O Controller Hub via the LPC bus using a standardized 5-signal FWH protocol, enabling secure, in-system firmware reads and writes while supporting hardware-based sector protection through TBL and WP pins.
Does the AT49LW080-33JC-T support both 3.3V and 12V VPP programming voltages?
Yes, the AT49LW080-33JC-T supports dual VPP operation: 3.3V (for low-power in-system use, with VPP tied to VCC) and 12V (for accelerated factory programming). Internal VPP detection automatically configures erase/program logic; however, 12V should be applied for ≤80 hours total over the device lifetime to avoid degradation.
How does the IC pin determine interface mode on the AT49LW080-33JC-T?
The IC pin selects interface mode at power-up or reset: logic low enables Firmware Hub (FWH) mode for runtime operation; logic high enables Address/Address Multiplexed (A/A Mux) mode for manufacturing programming. The pin has an internal 20–100 kΩ pull-down, so floating defaults to FWH mode - no external resistor is required unless A/A Mux mode is intended.
Can the AT49LW080-33JC-T be used as a direct replacement for the Intel 82802AB?
Yes, the AT49LW080-33JC-T is designed as a functional and pin-compatible replacement for the Intel 82802AB in 32-lead PLCC socketed BIOS applications. It matches the 8-Mbit density, FWH interface timing, ID[3:0] strapping, and hardware write-protection behavior - enabling drop-in replacement without PCB or firmware modifications.
What are the key differences between FWH mode and A/A Mux mode on the AT49LW080-33JC-T?
In FWH mode, the AT49LW080-33JC-T supports full feature access including sector lock registers, GPI reads, and security functions via the 5-signal LPC interface. In A/A Mux mode, it operates as a basic Flash programmer target with 11-pin multiplexed address + 8-pin data interface - supporting only reads, program, and erase, with no register or GPI access and RY/BY status output instead of FWH handshaking.
AT49LW080-33JC-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for AT49LW080-33JC-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LW080-33JC-T 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-T reliable?
The price and inventory of AT49LW080-33JC-T 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-T is usually 5 days.
3.What payment methods are accepted for AT49LW080-33JC-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LW080-33JC-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LW080-33JC-T?
AT49LW080-33JC-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LW080-33JC-T 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-T?
For technical support, including AT49LW080-33JC-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LW080-33JC-T requirements.
6.How does Aetrix verify that AT49LW080-33JC-T is sourced from the original manufacturer or authorized distributors?
All AT49LW080-33JC-T 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-T meets industry standards.
7.What is the process for return or replacement of AT49LW080-33JC-T?
All AT49LW080-33JC-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49LW080-33JC-T, 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-T part is unused and in its original packaging.
Return procedure for AT49LW080-33JC-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LW080-33JC-T Tags
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