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Microchip Technology AT49F001A-45VI
- Part No.:
- AT49F001A-45VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001A-45VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,309
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Product details
Overview
AT49F001A-45VI from Atmel is a 1 Mbit (128K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 45 ns read access time, supports byte-by-byte programming at 30 µs/byte, features hardware data protection, and includes sector architecture with a 16K-byte boot block having programmable lockout. It is commonly deployed in industrial control firmware storage where field-upgradable secure boot code is required.
For engineers reviewing the AT49F001A-45VI datasheet, AT49F001A-45VI pinout, AT49F001A-45VI application, or AT49F001A-45VI equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support details specific to the VSOP-32 package variant operating across –40°C to +85°C.
Technical Context
The AT49F001A-45VI implements a standard parallel Flash interface with CE/OE/WE control logic and supports EPROM-like read operation timing. Its internal program control logic handles command sequences for sector erase, chip erase, and byte programming without external high-voltage circuitry.
It uses a sector-based memory map comprising one 16K-byte boot block (address range 1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). The boot block lockout feature-enabled via six-cycle command sequence-prevents reprogramming unless RESET is driven to 12 V, a capability confirmed for the AT49F001A(T) family including this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); sufficient for full bootloader + configuration data in resource-constrained MCU systems |
| Read Access Time | 45 ns max; enables direct execution from Flash in 20–25 MHz bus systems without wait states |
| Byte Programming Time | 30 µs typical; allows rapid field updates of small firmware patches or calibration tables |
| Erase Cycle Time | 3 seconds max for full chip erase; supports maintenance windows under 5 seconds in service-mode operations |
| Operating Voltage | 5.0 V ±10%; eliminates need for dedicated programming voltage rails in 5V system designs |
| Standby Current | 50 µA CMOS; enables low-power retention during sleep modes in battery-backed industrial controllers |
| Endurance | 10,000 write/erase cycles; meets lifetime requirements for firmware update cycles over 10-year product deployments |
| Temperature Range | –40°C to +85°C industrial grade; qualified for use in motor drives, PLC modules, and outdoor telemetry units |
Pinout & Package
AT49F001A-45VI is supplied in a 32-lead Plastic Very Small Outline Package (VSOP), 8 mm × 14 mm body, JEDEC MO-142 BA-compliant, with gull-wing leads and pin 1 identifier notch. Pin pitch is 0.50 mm; lead coplanarity ≤0.10 mm.
| 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; enables bus contention avoidance |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, independent of CE state |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing; inhibits programming if held high |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data path; supports DATA polling on I/O7 and Toggle Bit detection on I/O6 during program/erase |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input enables boot block override (confirmed for AT49F001A(T)) |
| VCC | Power Supply | +5.0 V ±10% supply; internal VCC sense disables programming if voltage drops below 3.8 V |
| GND | Ground | Reference for all inputs/outputs; decoupling capacitor placement critical near this pin for noise immunity |
| NC | No Connect | Pin 32 in VSOP package; must remain unconnected; not bonded internally per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (1C000H–1FFFFH) can be permanently write-protected via command sequence, ensuring bootloader integrity during field updates |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high prevents writes) |
| DATA Polling & Toggle Bit | I/O7 complements last written byte until programming completes; I/O6 toggles during active program/erase-enables polling without status registers |
| 5V-Only Reprogrammability | No external 12 V programming voltage required; all commands executed using standard 5 V logic levels and timing |
| Industrial Temperature Operation | Qualified from –40°C to +85°C with 45 ns access time guaranteed; suitable for deployment in uncontrolled ambient environments |
Applications
| Industrial PLC Firmware Storage | Embedded Motor Drive Bootloader |
|---|---|
|
Use Scenario: Storing firmware and configuration parameters in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing fast random-access read for instruction fetch and byte-level reprogrammability for remote firmware patching. Use Value: 45 ns access time enables zero-wait-state execution; boot block lockout ensures certified safety routines remain immutable during routine updates. |
Use Scenario: Holding bootloader and motor control algorithms in variable-frequency drives operating in high-EMI industrial settings. IC Role / Device Role / Timing Role: Parallel Flash memory interfaced directly to MCU's external bus, serving as primary boot source and runtime parameter store. Use Value: 50 µA standby current minimizes power draw during drive idle states; hardware data protection prevents corruption from ESD or supply transients. |
| Medical Diagnostic Equipment Configuration | Telecom Remote Node Parameter Storage |
|
Use Scenario: Retaining calibration coefficients, device serializations, and regulatory compliance data in portable ultrasound or patient monitor units. IC Role / Device Role / Timing Role: Secure, field-updatable nonvolatile memory holding mission-critical configuration data isolated from main application flash. Use Value: Sector erase capability allows selective reprogramming of calibration tables without disturbing bootloader or safety firmware; 10,000-cycle endurance exceeds device lifetime requirements. |
Use Scenario: Storing protocol stacks, encryption keys, and network identifiers in outdoor DSLAM or fiber node equipment exposed to wide thermal swings. IC Role / Device Role / Timing Role: Industrial-grade Flash memory providing reliable parameter persistence across temperature cycling and long-term storage. Use Value: –40°C to +85°C rating ensures data retention in unheated street cabinets; VSOP package offers compact footprint for space-constrained telecom modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001BT-45EI | 1 Mbit, 45 ns, 3.0 V core with 5 V I/O; requires VPP = 12 V for programming; no boot block lockout | Lacks hardware-enforced boot protection; requires external voltage switching for programming | Choose only if 3.3 V system integration and legacy AM29LV compatibility outweigh boot security needs |
| SST39VF010-45-4C-NHE | 1 Mbit, 45 ns, 3.3 V operation; no 5 V tolerance; built-in command register; no RESET pin for boot override | Not pin-compatible; requires level-shifting in 5 V systems; no 12 V RESET override mechanism | Select when migrating to 3.3 V platforms and boot block protection is managed in software instead of hardware |
Compared with AT49F001A-45VI, AM29LV001BT-45EI demands higher programming voltage and lacks boot lockout, while SST39VF010-45-4C-NHE operates at 3.3 V only and omits the hardware-reset override-making AT49F001A-45VI uniquely suited for 5 V industrial systems requiring tamper-resistant bootloader storage.
Availability
AT49F001A-45VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded motor drive bootloaders, medical diagnostic configuration, and telecom remote node parameter storage requiring stable component supply across extended lifecycles.
Supply support for AT49F001A-45VI 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 devices.
The AT49F001A series was designed as a drop-in upgrade to EPROMs in 5 V embedded systems, delivering in-system reprogrammability without high-voltage programming infrastructure-targeting industrial control, instrumentation, and communications equipment.
FAQ
What is the memory organization of the AT49F001A-45VI?
The AT49F001A-45VI contains 1 Mbit organized as 131,072 words × 8 bits (128K × 8). Its physical address space spans 00000H–1FFFFH, with the boot block located at 1C000H–1FFFFH, two 8K parameter blocks, and two main memory blocks (32K and 64K bytes). This layout is explicitly defined for the AT49F001A(T) variant, which includes AT49F001A-45VI.
Does the AT49F001A-45VI support boot block protection, and how is it enabled?
Yes, the AT49F001A-45VI supports boot block programming lockout. It is enabled by executing a six-cycle command sequence (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H). Once activated, the 16K-byte boot block (1C000H–1FFFFH) cannot be erased or programmed at ≤5.5 V-confirmed for the AT49F001A(T) family.
Can the boot block of the AT49F001A-45VI be reprogrammed after lockout is enabled?
Yes-only by applying 12.0 V ±0.5 V to the RESET pin, which overrides the boot block lockout and permits chip erase, sector erase, or byte programming. This RESET-based override is explicitly documented for the AT49F001A(T) variant, and AT49F001A-45VI falls within that family designation per Atmel's ordering information.
What package type is used for the AT49F001A-45VI, and what are its key mechanical dimensions?
The AT49F001A-45VI uses a 32-lead VSOP (8 mm × 14 mm) package (ordering code suffix "V"). Per Atmel's packaging drawing 32V, it has a nominal body size of 14.00 mm × 8.00 mm, 0.50 mm lead pitch, gull-wing leads, and pin 1 identifier notch. Lead coplanarity is ≤0.10 mm, conforming to JEDEC MO-142 BA.
How does the AT49F001A-45VI indicate completion of a byte programming cycle?
The AT49F001A-45VI supports two hardware methods: DATA polling (I/O7 returns complement of loaded data until completion, then true data) and Toggle Bit detection (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both are functional without status registers and are confirmed for AT49F001A(N)(T) variants including AT49F001A-45VI.
AT49F001A-45VI 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:
- 45 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
AT49F001A-45VI FAQ
1.How can I place an order for AT49F001A-45VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001A-45VI 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 AT49F001A-45VI reliable?
The price and inventory of AT49F001A-45VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001A-45VI is usually 5 days.
3.What payment methods are accepted for AT49F001A-45VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001A-45VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001A-45VI?
AT49F001A-45VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001A-45VI 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 AT49F001A-45VI?
For technical support, including AT49F001A-45VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001A-45VI requirements.
6.How does Aetrix verify that AT49F001A-45VI is sourced from the original manufacturer or authorized distributors?
All AT49F001A-45VI 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 AT49F001A-45VI meets industry standards.
7.What is the process for return or replacement of AT49F001A-45VI?
All AT49F001A-45VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001A-45VI, 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 AT49F001A-45VI part is unused and in its original packaging.
Return procedure for AT49F001A-45VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001A-45VI Tags
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