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Microchip Technology AT49F001N-90VI
- Part No.:
- AT49F001N-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001N-90VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,146
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Product details
Overview
AT49F001N-90VI from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It features 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, hardware data protection, and sector-based architecture with a 16K-byte boot block supporting programming lockout.
For engineers reviewing the AT49F001N-90VI datasheet, AT49F001N-90VI pinout, AT49F001N-90VI application, or AT49F001N-90VI equivalent, this page delivers verified specifications, PLCC-32 package details, boot-block security behavior, DATA polling/Toggle Bit status detection, and industrial-grade (-40°C to +85°C) operation - all critical for firmware update design, BIOS/UEFI storage, and legacy system replacement.
Technical Context
The AT49F001N-90VI implements a standard parallel Flash interface with CE/OE/WE control logic, enabling EPROM-like read timing and command-driven erase/program operations. Its internal state machine executes 6-cycle software command sequences (e.g., Chip Erase at 5555h/AAh → 2AAAh/55h → 5555h/80h → …) without external high-voltage support.
It uses a sector-organized memory map: one 16K-byte boot block (00000h–03FFFh), two 8K-byte parameter blocks, and two main memory blocks (32K/64K bytes). Boot block lockout is enabled via a 6-byte command sequence and enforced by VCC-sense and noise-filter circuitry to prevent accidental writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits) - supports full firmware images for 8-bit MCUs and boot loaders. |
| Read Access Time | 90 ns max - meets timing for 11 MHz bus interfaces with margin. |
| Byte Programming Time | 10 µs typical - enables fast field updates of small configuration or calibration data. |
| Chip Erase Time | 10 seconds max - deterministic erase window for production programming and recovery. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delays in host firmware. |
| Operating Temperature | -40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure. |
| Power Dissipation | 50 mA active current / 100 µA CMOS standby - suitable for low-power wake-on-event designs. |
Pinout & Package
AT49F001N-90VI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE. Dimensions: 12.4 mm × 12.4 mm × 3.4 mm (max height), with J-leads and pin 1 identifier notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 directly map to memory locations 00000h–1FFFFh. |
| I/O0–I/O7 | Data Inputs/Outputs | 8-bit bidirectional data bus; supports byte-wide reads/writes and status polling on I/O6/I/O7. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output control; used with CE to avoid bus contention during shared-memory operation. |
| WE | Write Enable | Active-low write strobe; latches addresses and data during command sequences and byte programming. |
| RESET | Reset Input | Active-low reset; forces outputs to high-impedance and aborts ongoing program/erase - not used for boot override (unavailable on N variant). |
| VCC | Power Supply | +5.0 V ±10% supply; internal VCC sense disables programming if voltage drops below ~3.8 V. |
| GND | Ground | Reference return path for all signals and power; decoupling required within 1 cm of VCC pin. |
| NC | No Connect | Pin 1 (PLCC); must remain unconnected - no internal bond or function. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12V programming voltage - simplifies power design and enables in-circuit reprogramming via standard logic-level signals. |
| Boot Block Programming Lockout | 16K-byte region (00000h–03FFFh) can be permanently write-protected via command sequence - secures bootloader code against corruption. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibition (OE low/CE high/WE high) prevent spurious writes during power transients or EMI events. |
| Sector Architecture | Independent erasure of parameter blocks (8K each) and main memory blocks (32K/64K) enables modular firmware updates without full chip erase. |
| 10,000 Program/Erase Cycles | Guaranteed endurance for field firmware upgrades over product lifetime - validated per JEDEC JESD22-A117. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS/UEFI Module |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers subject to frequent field updates and harsh electrical environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with 90 ns read access and sector-erase capability - enables hot-swappable firmware patches without full system reboot. Use Value: Boot block lockout prevents accidental overwrite of core runtime engine while allowing safe parameter block updates - reducing downtime and validation overhead. |
Use Scenario: Replacing obsolete EPROMs in desktop/server motherboard BIOS chips requiring in-system reprogramming and long-term data retention. IC Role / Device Role / Timing Role: Parallel-interface Flash memory mapped into x86 processor's ROM space - operates under standard ISA/LPC timing with CE/OE/WE handshaking. Use Value: 5V-only operation and 10 µs byte programming enable compatibility with legacy BIOS update utilities and eliminate need for external programming hardware. |
| Telecom Line Card Bootloader | Automotive Body Control Module (BCM) |
Use Scenario: Hosting secure bootloader code in carrier-grade line cards where firmware integrity is mandated by DO-178B or IEC 61508. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write protection - stores cryptographic keys and signature verification routines in the locked boot block. Use Value: RESET pin is unused for lockout override (N variant), ensuring boot code immutability - meeting SIL-3 functional safety requirements for boot integrity. |
Use Scenario: Storing calibration tables, seat/mirror position profiles, and lighting configuration in automotive BCMs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Industrial-grade (-40°C to +85°C) Flash memory interfaced to 8-bit MCU via parallel bus - supports EEPROM-like field updates via CAN diagnostics. Use Value: 100 µA CMOS standby current minimizes battery drain during vehicle sleep mode; sector erase allows selective table updates without disturbing other configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-90VI | 2 Mbit (256K × 8), same PLCC-32 package, identical command set and timing - double density with no interface change. | Supports larger firmware images; requires no PCB change but may need minor address decoding adjustment for upper memory map. | Select when future firmware growth is anticipated and board layout accommodates same footprint. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, PLCC-32, 3.3V core (with 5V tolerant I/O); different command set (SST-style), no boot block lockout feature. | Lacks hardware boot protection; requires modified driver firmware for erase/program commands and voltage translation for 5V systems. | Consider only if migrating to 3.3V system architecture and boot security is handled externally. |
Compared with AT49F002N-90VI, the AT49F001N-90VI offers lower density but guaranteed backward compatibility in legacy 128K-address-space designs; versus SST39VF010, it provides native 5V operation and integrated boot security - eliminating external logic for write protection.
Availability
AT49F001N-90VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature grading.
Supply support for AT49F001N-90VI 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 support for the AT49F series Flash memories, including datasheets, application notes, and long-term manufacturing commitments.
The AT49F001N-90VI belongs to Atmel's legacy parallel Flash product line, designed specifically for drop-in replacement of UV-erasable EPROMs and early-generation Flash in cost-sensitive, industrial-grade embedded systems.
FAQ
What is the memory organization of the AT49F001N-90VI?
The AT49F001N-90VI contains 1 Mbit of memory organized as 131,072 words × 8 bits (128K × 8). Its physical address space spans 00000h to 1FFFFh. The memory is partitioned into a 16K-byte boot block (00000h–03FFFh), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). This structure is fixed and confirmed in the AT49F001N datasheet Rev. 1008D.
Does the AT49F001N-90VI support boot block lockout override using the RESET pin?
No. The AT49F001N-90VI does not support RESET-pin-based boot block override. Per the datasheet (page 5, "RESET" section and footnote), this feature is explicitly unavailable on the AT49F001N(T) variant. Only the AT49F001(T) and AT49F001NT variants support 12V RESET override for boot block reprogramming. The AT49F001N-90VI's boot block, once locked, remains permanently protected under 5.5V or less.
What package type is used for the AT49F001N-90VI?
The AT49F001N-90VI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information (page 15). Its mechanical dimensions conform to JEDEC MS-016, Variation AE: 12.4 mm × 12.4 mm body, 3.4 mm max height, with J-shaped leads and pin 1 identifier notch. This is distinct from PDIP, TSOP, or VSOP variants.
How is end-of-program detected on the AT49F001N-90VI?
The AT49F001N-90VI supports two hardware methods: DATA polling and Toggle Bit. During byte programming, reading the programmed address returns the complement of data on I/O7 until completion; then true data appears. Alternatively, I/O6 toggles between 0 and 1 during programming/erasing and stops toggling upon completion. Both methods are characterized and usable at any point during the cycle.
Is the AT49F001N-90VI compatible with standard EPROM socket footprints?
Yes - the AT49F001N-90VI in PLCC-32 (32J) package is pin-compatible with industry-standard 32-pin PLCC EPROM sockets (e.g., 27C512, 27C010). Its CE/OE/WE control scheme matches EPROM timing, and read operation requires no command entry. However, programming requires issuing Atmel-specific 4- or 6-cycle command sequences instead of EPROM's VPP-based method.
AT49F001N-90VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49F001N-90VI FAQ
1.How can I place an order for AT49F001N-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001N-90VI 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 AT49F001N-90VI reliable?
The price and inventory of AT49F001N-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001N-90VI is usually 5 days.
3.What payment methods are accepted for AT49F001N-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001N-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001N-90VI?
AT49F001N-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001N-90VI 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 AT49F001N-90VI?
For technical support, including AT49F001N-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001N-90VI requirements.
6.How does Aetrix verify that AT49F001N-90VI is sourced from the original manufacturer or authorized distributors?
All AT49F001N-90VI 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 AT49F001N-90VI meets industry standards.
7.What is the process for return or replacement of AT49F001N-90VI?
All AT49F001N-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001N-90VI, 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 AT49F001N-90VI part is unused and in its original packaging.
Return procedure for AT49F001N-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001N-90VI Tags
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M24C02-WMN6TP
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