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Microchip Technology AT49F001T-90VI
- Part No.:
- AT49F001T-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001T-90VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,059
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Product details
Overview
AT49F001T-90VI from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs/byte typical programming time, and sector-based erase architecture including a 16 KB boot block with programmable lockout. It operates across -40°C to +85°C and supports embedded firmware storage in industrial microcontroller systems.
For engineers reviewing the AT49F001T-90VI datasheet, AT49F001T-90VI pinout, AT49F001T-90VI application, or AT49F001T-90VI equivalent, this page delivers verified electrical specs, PLCC-32 package layout, boot-block protection behavior, sector erase timing, and real-world use cases for firmware update systems requiring field-reprogrammable nonvolatile storage.
Technical Context
The AT49F001T-90VI implements a command-driven Flash architecture using standard CE/OE/WE control logic compatible with EPROM interfaces. Its internal program controller manages byte programming and sector/chip erase cycles without external high-voltage support.
Memory organization is split into five sectors: one 16 KB boot block (address range 1C000H–1FFFFH), two 8 KB parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH and 00000H–0FFFFH). Boot block lockout is enabled via a six-cycle command sequence and overridden only by applying 12 V to RESET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces EPROMs in 8-bit bus systems. |
| Read Access Time | 90 ns max - ensures compatibility with 11 MHz bus timing in legacy microcontrollers. |
| Byte Programming Time | 10 µs typical - enables rapid field updates of small firmware patches without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip or sector - deterministic timing simplifies host firmware timeout handling. |
| End-of-Program Detection | DATA polling (I/O7 complement) and TOGGLE bit (I/O6 toggling) - eliminates need for fixed delay loops in bootloader code. |
| Boot Block Protection | 16 KB region (1C000H–1FFFFH) lockable via command; reprogrammable only with 12 V on RESET - secures boot code integrity while allowing runtime updates to application sectors. |
| Operating Voltage | 5.0 V ±10% - single-supply operation avoids dual-rail design complexity in industrial controllers. |
| Temperature Range | -40°C to +85°C - qualified for industrial embedded applications including motor drives and PLC modules. |
Pinout & Package
AT49F001T-90VI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), measuring 12.5 mm × 12.5 mm × 3.5 mm, with gull-wing J-leads and pin 1 identifier notch. Pin 1 is DC (do not connect) per datasheet Note on page 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 selects upper/lower memory banks. |
| I/O0–I/O7 | Data Inputs/Outputs | 8-bit bidirectional data bus; supports byte-wide reads/writes and DATA polling on I/O7/I/O6. |
| 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 gate; controls data bus tristate during read; high during programming/erase. |
| WE | Write Enable | Active-low write strobe; latches addresses/data during command sequences and byte programming. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V override enables boot block reprogramming. |
| VCC | Power Supply | +5 V supply; internal voltage sensing disables programming if VCC < 3.8 V (typical). |
| GND | Ground | Reference ground for all signals and power; decoupling required near VCC pin. |
| NC | No Connect | Pin 1 (PLCC); must remain unconnected per datasheet - floating or tied to GND/VCC causes undefined behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Operation | Eliminates need for +12 V or +25 V programming supplies - reduces BOM count and PCB routing complexity. |
| Sector Architecture | Enables selective erasure of parameter blocks (8 KB each) or main memory blocks (32 KB/64 KB), preserving boot code during partial firmware updates. |
| Hardware Data Protection | VCC sense, noise filtering (15 ns pulse rejection), and control-line inhibition prevent accidental writes during power transients or EMI events. |
| 10,000 Write/Erase Cycles | Supports long-term field maintenance of firmware images in industrial equipment with multi-year service life. |
| CMOS Standby Current | 100 µA max at 0°C–70°C - suitable for battery-backed systems where low quiescent power is critical. |
| DATA Polling & Toggle Bit | Provides software-synchronized end-of-program detection without external timers or status registers - simplifies bootloader implementation. |
Applications
| Firmware Boot Storage | Industrial Parameter Configuration |
|---|---|
|
Use Scenario: Storing immutable boot loader code in a programmable logic controller (PLC) that initializes hardware and loads application firmware from external media. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped at reset vector address; accessed within first 90 ns after reset assertion. Use Value: Boot block lockout prevents corruption during field firmware upgrades, ensuring guaranteed system recovery even after failed application updates. |
Use Scenario: Holding calibration constants and user-defined operational parameters in a motor drive inverter, updated via HMI or service tool. IC Role / Device Role / Timing Role: Parameter block (8 KB) used for infrequent writes; erased and rewritten only during commissioning or recalibration. Use Value: Sector-level erase isolates parameter changes from main firmware, avoiding full-chip erase delays and reducing update time to under 10 seconds. |
| Main Firmware Image Storage | Field-Upgradeable Communication Stack |
|
Use Scenario: Hosting the primary application firmware image in a smart sensor node, updated over CAN bus during scheduled maintenance windows. IC Role / Device Role / Timing Role: Main memory block (64 KB) stores executable code; accessed via standard memory-mapped read cycles during execution. Use Value: 90 ns access time matches 8-bit microcontroller bus timing; 10 µs/byte programming allows patch-level updates without full-image reflash. |
Use Scenario: Storing protocol stack binaries (Modbus TCP, EtherNet/IP) in an industrial gateway, updated remotely via secure OTA mechanism. IC Role / Device Role / Timing Role: Dual main memory blocks enable A/B firmware partitioning - one active, one staging - enabling atomic updates with rollback capability. Use Value: Sector erase independence allows background staging of new stack while legacy stack remains operational, eliminating network downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002T-90VI | 2 Mbit density (256K × 8), same 90 ns access, identical PLCC-32 package and command set. | Supports larger firmware images; requires no PCB change but needs updated address decoding for A17. | Select when future firmware growth exceeds 1 Mbit; retains full software compatibility and pinout. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, PLCC-32, but uses different command sequences (SST-specific) and lacks boot block lockout override via RESET. | Requires modified bootloader code; no 12 V override for protected sectors - limits field recovery options. | Choose for cost-sensitive designs where boot block override is unnecessary and SST's faster 1 µs write cycle is beneficial. |
Compared with AT49F001T-90VI, AT49F002T-90VI offers scalable capacity with zero layout impact, while SST39VF010-90-4C-NHE trades boot security flexibility for marginally faster writes and vendor-specific command handling.
Availability
AT49F001T-90VI is available at Aetrix Electronics and suitable for industrial automation controllers, programmable logic controllers (PLCs), and embedded communication gateways requiring stable component supply, long lifecycle support, and guaranteed availability through obsolescence transitions.
Supply support for AT49F001T-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 legacy Atmel Flash products, including datasheets, application notes, and long-term manufacturing commitments.
The AT49F001T series belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in industrial and automotive control systems where field-upgradable firmware and robust data retention are essential.
FAQ
What is the boot block address range for AT49F001T-90VI?
The boot block for AT49F001T-90VI occupies address range 1C000H to 1FFFFH (16 KB). This differs from the base AT49F001N, which locates the boot block at 00000H–03FFFH. The relocated boot block in AT49F001T-90VI enables flexible memory mapping in systems where lower addresses are reserved for RAM or peripherals. The AT49F001T-90VI datasheet confirms this mapping in Section 6, "Notes".
Does AT49F001T-90VI support 12 V override for boot block reprogramming?
Yes, AT49F001T-90VI supports 12 V ±0.5 V applied to the RESET pin to override boot block lockout and permit reprogramming of the protected 16 KB sector. This feature is explicitly documented in the "BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE" section of the AT49F001T-90VI datasheet and is not available on AT49F001N(T) variants.
What is the maximum erase time for a single sector in AT49F001T-90VI?
The maximum erase time for any sector - including parameter blocks (8 KB) or main memory blocks (32 KB/64 KB) - is 10 seconds. This value is specified as tEC (Erase Cycle Time) in the AC Characteristics table and applies uniformly across all sector types. The AT49F001T-90VI performs internal timing, requiring no external clock or polling during erase.
Can AT49F001T-90VI be used as a direct replacement for AT49F001-90VI?
No, AT49F001T-90VI is not a direct replacement for AT49F001-90VI due to differences in boot block location (1C000H–1FFFFH vs. 00000H–03FFFH) and device identification code (04H vs. 05H). Software relying on boot block address or hardware ID detection will require modification. The AT49F001T-90VI datasheet confirms these distinctions in the "Product Identification" and "Boot Block Programming Lockout" sections.
What packaging options are available for AT49F001T-90VI?
AT49F001T-90VI is offered exclusively in the 32-lead PLCC (32J) package, as indicated in the "AT49F001T Ordering Information" table on page 16 of the datasheet. Unlike other variants such as AT49F001T-90JC (PLCC) or AT49F001T-90TC (TSOP), the "VI" suffix denotes Industrial temperature grade (-40°C to +85°C) and PLCC packaging only.
AT49F001T-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
AT49F001T-90VI FAQ
1.How can I place an order for AT49F001T-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-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 AT49F001T-90VI reliable?
The price and inventory of AT49F001T-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-90VI is usually 5 days.
3.What payment methods are accepted for AT49F001T-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-90VI?
AT49F001T-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-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 AT49F001T-90VI?
For technical support, including AT49F001T-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-90VI requirements.
6.How does Aetrix verify that AT49F001T-90VI is sourced from the original manufacturer or authorized distributors?
All AT49F001T-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 AT49F001T-90VI meets industry standards.
7.What is the process for return or replacement of AT49F001T-90VI?
All AT49F001T-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-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 AT49F001T-90VI part is unused and in its original packaging.
Return procedure for AT49F001T-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001T-90VI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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