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Microchip Technology AT49F001AT-55VI
- Part No.:
- AT49F001AT-55VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001AT-55VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,234
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Product details
Overview
AT49F001AT-55VI from Atmel is a 1 Mbit (128K × 8) 5V-only in-system reprogrammable Flash memory with 55 ns read access time, 3-second chip erase cycle, and sector architecture comprising one 16K-byte boot block (address range 1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K/64K bytes). It supports byte-by-byte programming at 30 µs/byte and operates across the industrial temperature range (−40°C to +85°C) for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F001AT-55VI datasheet, AT49F001AT-55VI pinout, AT49F001AT-55VI application, or AT49F001AT-55VI equivalent, this page delivers verified technical context, real-world timing behavior, hardware data protection mechanisms, boot-block lockout logic, and validated alternative Flash parts for industrial firmware upgrade paths.
Technical Context
The AT49F001AT-55VI implements standard EPROM-compatible control logic with CE/OE/WE inputs and supports command-based operations including chip erase (6-cycle sequence), sector erase (6-cycle), byte programming (4-cycle), and boot block lockout enable (6-cycle). Its internal program control logic eliminates need for external high-voltage programming signals.
It features dual hardware protection: VCC sense (program inhibited below 3.8 V) and noise filtering (WE/CE pulses <15 ns ignored), plus DATA polling (I/O7 complement-to-data) and Toggle Bit (I/O6 toggling) for end-of-operation detection. The RESET pin enables boot block override at 12 V - a feature present only on AT49F001AT variants, not AN(T) versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits |
| Read Access Time | 55 ns - determines maximum bus clock frequency for reliable read cycles in 8-bit microcontroller interfaces |
| Erase Cycle Time | 3 seconds (typical) - defines minimum firmware update latency during field reprogramming |
| Byte Programming Time | 30 µs (typical) - sets write throughput limit of ~33 KB/s for incremental code patching |
| Operating Voltage | 5 V ±10% - enables direct integration into legacy 5V logic systems without level-shifting |
| Standby Current | 50 µA CMOS - ensures ultra-low power retention in battery-backed or sleep-mode applications |
| Endurance | 10,000 program/erase cycles - qualifies for long-life embedded firmware storage in industrial controllers |
| Temperature Range | −40°C to +85°C - certified for use in industrial-grade equipment without thermal derating |
Pinout & Package
AT49F001AT-55VI is supplied in a 32-lead Plastic Thin Small Outline Package (VSOP), 8 mm × 14 mm footprint (JEDEC MO-142 BA), with gull-wing leads and pin 1 identifier notch. Pinout matches standard 8-bit parallel Flash interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A11–A16 are don't-care in some command cycles |
| 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 to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing |
| RESET | Reset Input | Active-low reset; at 12 V enables boot block override - unique to AT49F001AT variant |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data path; supports DATA polling (I/O7) and Toggle Bit (I/O6) status reporting |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; VCC sense disables programming if <3.8 V |
| GND | Ground | Reference for all input thresholds and output levels; required for stable timing and noise immunity |
| NC | No Connect | Pin 32 in VSOP package - electrically isolated; no routing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (1C000H–1FFFFH) programmable lockout prevents accidental overwrite of secure startup code |
| Hardware Data Protection | VCC sense, noise-filtered WE/CE inputs, and program-inhibit logic prevent spurious writes during power transients |
| Two End-of-Operation Detection Methods | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) allow flexible firmware polling without fixed timeouts |
| 12 V RESET Override | Applying 12 V to RESET pin unlocks protected boot block for reprogramming - exclusive to AT49F001AT family |
| Industrial Temperature Operation | Guaranteed functionality from −40°C to +85°C with no derating - suitable for factory automation and outdoor equipment |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
|
Use Scenario: Storing bootloader and safety-critical initialization routines in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with hardware-protected boot sector ensuring uncorrupted startup after power loss or brownout. Use Value: Prevents system failure due to corrupted boot code; 10,000-cycle endurance supports decades of field updates under industrial duty cycles. |
Use Scenario: Holding certified diagnostic firmware and regulatory-compliant boot sequences in portable ultrasound and infusion pump controllers. IC Role / Device Role / Timing Role: Secure, tamper-resistant code storage with 12 V RESET override enabling authorized service reprogramming. Use Value: Meets IEC 62304 software lifecycle requirements via hardware-enforced boot integrity and traceable update capability. |
| Automotive ECU Calibration Data | Telecom Base Station Configuration |
|
Use Scenario: Storing engine calibration maps and emission control parameters in engine control units operating under wide thermal stress. IC Role / Device Role / Timing Role: High-reliability Flash memory with 55 ns read timing synchronized to 8-bit MCU bus cycles. Use Value: −40°C to +85°C operation and 50 µA standby current reduce thermal management burden and extend battery backup life. |
Use Scenario: Maintaining configuration profiles and protocol stacks in remote radio head controllers requiring zero-downtime field upgrades. IC Role / Device Role / Timing Role: Sector-erasable Flash enabling selective parameter block updates without disrupting active main memory operations. Use Value: Two independent 8K-byte parameter blocks allow A/B configuration swapping, minimizing service interruption during telecom software rollouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-55REI | 1 Mbit, 55 ns, 3.0 V core (3.3 V I/O); requires VPP = 12 V for programming | Lacks 5V-only operation and boot block lockout; uses different command set | Choose when migrating to lower-voltage systems and external high-voltage generation is acceptable |
| SST39VF010-55-4C-NHE | 1 Mbit, 55 ns, 3.3 V only; no 12 V RESET override; supports Top/Bottom boot block selection | Requires level translation in 5V systems; no hardware boot protection override mechanism | Prefer for cost-sensitive 3.3 V designs where boot block flexibility outweighs 5V compatibility |
Compared with AM29LV001MT-55REI and SST39VF010-55-4C-NHE, the AT49F001AT-55VI uniquely delivers 5V-only operation, hardware-enforced boot block lockout with 12 V override, and native compatibility with legacy 5V microcontroller buses - eliminating voltage translation and simplifying firmware update architecture.
Availability
AT49F001AT-55VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, automotive ECU calibration data, telecom base station configuration, and embedded controller firmware update applications requiring stable component supply across extended product lifecycles.
Supply support for AT49F001AT-55VI 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F001A(T) series was designed as a drop-in 5V Flash replacement for EPROMs in legacy embedded systems, emphasizing in-system reprogrammability, hardware data protection, and sector-level erase flexibility for firmware maintenance.
FAQ
What is the boot block address range for AT49F001AT-55VI?
The boot block for AT49F001AT-55VI occupies address range 1C000H to 1FFFFH (16K bytes), distinct from the AT49F001A(N) variant's 00000H–03FFFH mapping. This layout isolates critical startup code in upper memory, enabling safe field updates to lower memory regions without risking boot corruption. The AT49F001AT-55VI datasheet confirms this mapping in Section 4 and Command Definitions table.
Does AT49F001AT-55VI support 12 V programming voltage?
No - AT49F001AT-55VI is a 5V-only Flash device: reads and programs at 5 V ±10%. However, it does accept 12 V ±0.5 V on the RESET pin to override boot block lockout, enabling reprogramming of protected sectors. This 12 V signal is strictly for RESET override and never applied to VCC or programming pins. The AT49F001AT-55VI specification explicitly defines this in the "Boot Block Programming Lockout Override" section.
How is end-of-program detection implemented in AT49F001AT-55VI?
AT49F001AT-55VI provides two hardware-supported methods: DATA polling (reading last programmed byte returns complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0/1 during operation, then stabilizes). Both are usable at any point during programming. These mechanisms eliminate need for fixed delay loops and improve firmware robustness. The AT49F001AT-55VI datasheet details timing in Sections 5 and 12.
What package type is used for AT49F001AT-55VI?
AT49F001AT-55VI uses the 32-lead Plastic Very Small Outline Package (VSOP), designated as package code "32V", with 8 mm × 14 mm body size and gull-wing leads (JEDEC MO-142 BA). This surface-mount package offers compact footprint and thermal performance suited for space-constrained industrial PCBs. Package dimensions and pinout are fully specified in the AT49F001AT-55VI datasheet Package Information section.
Can AT49F001AT-55VI be used in place of AT49F001A-55VI?
No - AT49F001AT-55VI and AT49F001A-55VI differ in boot block location (1C000H–1FFFFH vs. 00000H–03FFFH) and RESET pin functionality (12 V override enabled only on AT variants). Firmware compiled for one will not execute correctly on the other without address remapping. The AT49F001AT-55VI datasheet explicitly states these architectural distinctions in the "Boot Block Programming Lockout" and "Device Operation" sections.
AT49F001AT-55VI 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:
- 55 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
AT49F001AT-55VI FAQ
1.How can I place an order for AT49F001AT-55VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AT-55VI 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 AT49F001AT-55VI reliable?
The price and inventory of AT49F001AT-55VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AT-55VI is usually 5 days.
3.What payment methods are accepted for AT49F001AT-55VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AT-55VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AT-55VI?
AT49F001AT-55VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AT-55VI 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 AT49F001AT-55VI?
For technical support, including AT49F001AT-55VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AT-55VI requirements.
6.How does Aetrix verify that AT49F001AT-55VI is sourced from the original manufacturer or authorized distributors?
All AT49F001AT-55VI 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 AT49F001AT-55VI meets industry standards.
7.What is the process for return or replacement of AT49F001AT-55VI?
All AT49F001AT-55VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AT-55VI, 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 AT49F001AT-55VI part is unused and in its original packaging.
Return procedure for AT49F001AT-55VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001AT-55VI Tags
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