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Microchip Technology AT49F512-55VI
- Part No.:
- AT49F512-55VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F512-55VI.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,804
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Product details
Overview
AT49F512-55VI from Atmel is a 5V-only, in-system programmable Flash memory IC with 512 Kbit (64K × 8) capacity, 55 ns read access time, and industrial temperature range (–40°C to +85°C). It features an 8K-byte boot block with hardware lockout, byte-by-byte programming (10 µs/byte), and DATA polling for end-of-program detection - used in embedded firmware storage and boot code retention applications.
For engineers reviewing the AT49F512-55VI datasheet, AT49F512-55VI pinout, AT49F512-55VI application, or AT49F512-55VI equivalent, key selection considerations include its 5V-only operation, boot sector protection mechanism, PLCC/VSOP/TSOP package compatibility, and 10,000-cycle endurance for field-upgradable systems.
Technical Context
The AT49F512-55VI implements a nonvolatile CMOS Flash architecture with internal program control logic and a 6-byte command register for chip erase, byte programming, and boot block lockout. Its read interface emulates EPROM timing, requiring CE and OE low with WE high to assert data on I/O0–I/O7.
Erase and program operations are initiated via address/data sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h for chip erase), with hardware data protection including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and dual-line write inhibit (OE low or CE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), organized as 65,536 words × 8 bits - supports full firmware image storage in compact microcontroller systems. |
| Read Access Time | 55 ns maximum - enables direct execution from flash in real-time embedded controllers without wait states at 18 MHz bus clock. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of configuration data or patch code without system downtime. |
| Chip Erase Time | 10 seconds maximum - deterministic full-memory reset for secure reinitialization before firmware reload. |
| Endurance | 10,000 program/erase cycles - validated for long-term use in industrial equipment with periodic firmware upgrades. |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary voltage rails; compatible with legacy 5V logic and power domains. |
| Temperature Range | Industrial: –40°C to +85°C - qualified for deployment in automotive body control modules and industrial PLCs. |
Pinout & Package
AT49F512-55VI is supplied in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm footprint, compliant with JEDEC MO-142 Variation BA. Pin 1 identifier located at top-left corner; lead coplanarity ≤0.10 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; A0–A15 directly map to memory location selection during read/write. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for reading stored firmware or loading new bytes; high-impedance when deselected (CE or OE high). |
| CE | Chip Enable | Active-low global enable; must be low with OE low and WE high for read access; high state forces outputs to high-Z and disables internal logic. |
| OE | Output Enable | Active-low output gate; controls data assertion on I/O lines independently of CE - enables bus sharing with other peripherals. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge (WE or CE, whichever occurs last); initiates command decoding when combined with address/data sequences. |
| VCC | Power Supply | +5.0 V supply input; internally regulated for core logic and charge pump; requires local 0.1 µF ceramic decoupling. |
| GND | Ground Reference | Signal and power ground return; shared reference for all inputs, outputs, and internal voltage generation. |
| NC | No Connect | Unbonded pins (positions 15, 16, 31 per VSOP top view); must remain unconnected to avoid parasitic coupling or ESD paths. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only in-system programming | Eliminates need for 12 V programming voltage - simplifies board design and enables field firmware updates via standard 5V I/O interfaces. |
| 8K-byte boot block with lockout | Hardware-enforced write protection for addresses 0000H–1FFFH - ensures bootloader integrity while allowing main array updates. |
| DATA polling & toggle bit | Dual asynchronous status reporting (I/O7 complement or I/O6 toggling) - removes dependency on fixed timing delays during programming/erase. |
| Hardware data protection | VCC sense, noise filtering, and multi-signal inhibit (OE/CE/WE) prevent accidental writes - critical for reliability in electrically noisy industrial environments. |
| Green (Pb/Halide-free) packaging option | RoHS-compliant VSOP variant available (AT49F512-55VU) - meets environmental compliance requirements without performance trade-offs. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed boot code retention; 55 ns read access supports deterministic scan cycle timing. Use Value: Boot block lockout prevents corruption of startup routines during over-the-air updates; 10,000-cycle endurance matches expected service life of industrial control hardware. | Use Scenario: Holding calibration data and diagnostic firmware in door module ECUs subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Field-upgradable flash memory operating across –40°C to +85°C; 5V-only interface integrates directly with 5V CAN transceiver power domain. Use Value: Hardware data protection (VCC sense, noise filtering) prevents spurious writes during load dump events; VSOP package minimizes PCB area in space-constrained modules. |
| Medical Infusion Pump Bootloader | Point-of-Sale Terminal BIOS |
Use Scenario: Securing bootloader code that validates signed application firmware before execution in Class II medical devices. IC Role / Device Role / Timing Role: Trusted boot memory with immutable 8K boot sector; DATA polling enables safe, interruptible firmware validation routines. Use Value: Boot block lockout activated at manufacturing ensures bootloader cannot be overwritten by field updates - satisfies IEC 62304 software lifecycle requirements. | Use Scenario: Storing BIOS and peripheral initialization code in retail kiosks requiring remote firmware patches between business hours. IC Role / Device Role / Timing Role: In-system reprogrammable flash with fast 10 µs/byte programming - enables background update of non-critical BIOS sections without system reboot. Use Value: 55 ns read speed supports fast POST execution; industrial temp rating ensures reliability in uncontrolled retail environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV512-55EC | 5V-only, 512 Kbit, 55 ns, 32-pin TSOP; uses different command set (AMD-style) and lacks boot block lockout. | No hardware-protected boot sector; requires external logic or software checks to safeguard bootloader. | Select when AMD-compatible command protocol is required and boot protection is managed at system level. |
| SST39VF512-55-4C-NHE | 5V-only, 512 Kbit, 55 ns, 32-pin TSOP; includes single-byte write capability but no dedicated boot block feature. | Supports byte-write without full-chip erase, but offers no hardware-enforced boot sector protection. | Choose for applications needing frequent small-data updates where boot code integrity is enforced via external watchdog or signature verification. |
Compared with AM29LV512-55EC and SST39VF512-55-4C-NHE, the AT49F512-55VI uniquely integrates hardware-based boot block lockout within the same 55 ns, 5V-only Flash architecture - delivering superior bootloader security without additional components or firmware complexity.
Availability
AT49F512-55VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, medical infusion pump bootloaders, and point-of-sale terminal BIOS requiring stable component supply across extended product lifecycles.
Supply support for AT49F512-55VI 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, nonvolatile memory, and secure authentication solutions.
The AT49F512 belongs to Atmel's 5V Flash memory product line, designed specifically for embedded systems requiring in-system reprogrammability, industrial temperature operation, and hardware-secured boot code storage.
FAQ
What is the memory organization of the AT49F512-55VI?
The AT49F512-55VI contains 512 Kbit of Flash memory organized as 64K words × 8 bits (65,536 addresses × 8-bit data width). This structure supports direct byte-level access and is optimized for storing firmware images and configuration data in microcontroller-based systems. The AT49F512-55VI's address space spans 0000H to FFFFH, with the lower 8K bytes (0000H–1FFFH) designated as the programmable lockout boot block.
Does the AT49F512-55VI require high-voltage programming signals?
No, the AT49F512-55VI operates exclusively at 5V for both read and programming functions - no external 12V or 12.5V programming voltage is needed. All commands (chip erase, byte program, boot lockout) are executed using standard 5V logic levels applied to address and data pins in specific sequences. This 5V-only architecture simplifies power design and enables in-system reprogramming via standard microcontroller GPIOs. The AT49F512-55VI incorporates internal charge pumps to generate necessary high voltages for Flash cell manipulation.
How is boot block protection enabled on the AT49F512-55VI?
Boot block protection on the AT49F512-55VI is enabled by executing a six-cycle command sequence: write AAh to address 5555h, 55h to 2AAAh, 80h to 5555h, AAh to 5555h, 55h to 2AAAh, then 40h to 5555h - with a 1-second pause before the final step. Once activated, the 8K-byte region (0000H–1FFFH) becomes permanently read-only; erasure and programming are blocked. The AT49F512-55VI provides software detection of lockout status via I/O0 during product identification mode.
What package type does the AT49F512-55VI use?
The AT49F512-55VI uses a 32-lead Very Small Outline Package (VSOP) measuring 8 mm × 14 mm, compliant with JEDEC MO-142 Variation BA. It features gull-wing leads, pin 1 identifier in the top-left corner, and a maximum lead coplanarity of 0.10 mm. This surface-mount package offers higher density than PLCC and better thermal performance than standard TSOP variants, making it suitable for compact industrial and automotive control boards. The AT49F512-55VI's VSOP footprint is distinct from the PLCC (32J) and TSOP (32T) variants listed in Atmel's ordering guide.
Can the AT49F512-55VI be used in place of EPROMs like the 27C512?
Yes, the AT49F512-55VI is pin-compatible and functionally compatible with 27C512 EPROMs in read mode - sharing identical 32-pin DIP/PLCC/TSOP pinouts, address/data bus layout, and CE/OE/WE control signals. However, unlike one-time-programmable EPROMs, the AT49F512-55VI supports in-system erasure and reprogramming using 5V-only commands. Its 55 ns access time matches or exceeds standard 27C512 speeds, and the AT49F512-55VI adds features like DATA polling and hardware boot protection not available in EPROMs.
AT49F512-55VI 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:
- 512Kbit
- Memory Organization:
- 64K 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
AT49F512-55VI FAQ
1.How can I place an order for AT49F512-55VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F512-55VI 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 AT49F512-55VI reliable?
The price and inventory of AT49F512-55VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F512-55VI is usually 5 days.
3.What payment methods are accepted for AT49F512-55VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F512-55VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F512-55VI?
AT49F512-55VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F512-55VI 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 AT49F512-55VI?
For technical support, including AT49F512-55VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F512-55VI requirements.
6.How does Aetrix verify that AT49F512-55VI is sourced from the original manufacturer or authorized distributors?
All AT49F512-55VI 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 AT49F512-55VI meets industry standards.
7.What is the process for return or replacement of AT49F512-55VI?
All AT49F512-55VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F512-55VI, 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 AT49F512-55VI part is unused and in its original packaging.
Return procedure for AT49F512-55VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F512-55VI Tags
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