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Microchip Technology AT49F1024-55VC
- Part No.:
- AT49F1024-55VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F1024-55VC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
AT49F1024-55VC from Atmel is a 5V-only, 1 Mbit (64K × 16) Flash memory IC designed for embedded boot code storage and firmware updates in microcontroller-based systems. It features 35 ns read access time, 8K-word programmable lockout boot block, and word-by-word programming at 10 µs/word. Its VSOP-40 package supports space-constrained industrial control and telecom applications.
For engineers reviewing the AT49F1024-55VC datasheet, AT49F1024-55VC pinout, AT49F1024-55VC application, or AT49F1024-55VC equivalent, key selection criteria include commercial temperature range (0°C to 70°C), 55 ns maximum address-to-output delay, hardware data protection via VCC sense and noise filtering, and boot block lockout verification via software product identification mode.
Technical Context
The AT49F1024-55VC implements a CMOS-based Flash architecture with internal program control logic and autonomous erase timing. It supports three primary operational modes: standard EPROM-like read (CE/OE low, WE high), word programming (four-bus-cycle command sequence), and chip/main memory erase (six-bus-cycle sequences using address/data latches at 5555H/2AAA).
Its dual-line chip enable (CE) and output enable (OE) control enables flexible bus contention management, while hardware data protection includes VCC sense (<3.8 V inhibits programming), active-high WE/CE/OE inhibit logic, and 15 ns noise filtering on control inputs. Boot block lockout is enabled via a six-step command sequence targeting addresses 5555H and 2AAA, permanently protecting the 0000H–1FFFH region.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (64K × 16 words), enabling full 16-bit microcontroller boot image storage |
| Read Access Time | 55 ns max (tACC), compatible with 18 MHz bus timing in legacy embedded systems |
| Programming Speed | 10 µs/word typical, allowing rapid field firmware patching without system downtime |
| End-of-Operation Detection | Data Polling (I/O7 complement) and Toggle Bit (I/O6 toggling), eliminating need for fixed timeout delays |
| Boot Block Protection | 8K-word (0000H–1FFFH) lockout feature, preserving secure bootloader during main memory updates |
| Endurance | 10,000 program/erase cycles, supporting long-term field upgradeability in industrial deployments |
| Operating Voltage | 5.0 V ±10%, single-supply operation simplifying power design versus mixed-voltage Flash devices |
| Standby Current | 100 µA max (ISB1, commercial), minimizing quiescent power in always-on control modules |
Pinout & Package
AT49F1024-55VC uses a 40-lead, 10 mm × 14 mm Thin Small Outline Package (VSOP), optimized for surface-mount assembly in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; A15 unused in boot block detection mode |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel interface; I/O7 used for Data Polling, I/O6 for Toggle Bit status monitoring |
| CE | Chip Enable | Active-low global select; must be low for read/program/erase; high state forces outputs to high-Z |
| OE | Output Enable | Active-low output gate; controls data assertion on I/O lines during read; high disables outputs |
| WE | Write Enable | Active-low programming/erase control; latches address/data on rising/falling edges per command cycle |
| VCC | Power Supply | +5.0 V supply; VCC sense circuitry disables programming if voltage drops below 3.8 V |
| GND | Ground | Two dedicated ground pins (pins 18 and 30) reduce ground bounce during high-speed writes |
| NC | No Connect | Pins 7, 19, 27, 28, 31, 39, 40 are unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12V programming voltage, enabling direct connection to 5V microcontroller buses |
| Hardware Data Protection | VCC sense, OE/CE/WE inhibit logic, and 15 ns noise filtering prevent accidental writes during power transients |
| Boot Block Lockout | Software-enabled permanent write protection of 0000H–1FFFH region, securing bootloader integrity |
| Fast Erase Cycle | 10 seconds typical chip erase time, reducing firmware update latency in production test environments |
| Software Product Identification | Manufacturer code 001FH and device code 0087H readable via 3-cycle command, enabling automated BOM validation |
| Toggle Bit & Data Polling | Dual asynchronous end-of-operation detection methods eliminate polling overhead and improve real-time system responsiveness |
Applications
| Industrial PLC Firmware Storage | Telecom Line Card Boot Code |
|---|---|
|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate code execution on power-up; 55 ns access ensures compatibility with 18 MHz CPU buses. Use Value: 8K-word boot block lockout prevents corruption of critical startup routines during field firmware updates over Modbus or Ethernet. |
Use Scenario: Holding initialization code and DSP microcode in carrier-grade line cards requiring hot-swap capability and zero-downtime upgrades. IC Role / Device Role / Timing Role: Primary boot memory mapped into CPU address space; VSOP-40 footprint enables dense board layout in multi-channel cards. Use Value: 10,000 write cycles and hardware data protection ensure reliable reprogramming across 15+ years of service life in telco central offices. |
| Medical Diagnostic Equipment BIOS | Automotive ECU Calibration Data |
|
Use Scenario: Storing safety-critical BIOS and self-test routines in portable ultrasound and MRI subsystems operating within commercial temperature range. IC Role / Device Role / Timing Role: Secure boot memory with verified manufacturer/device ID (001FH/0087H) for regulatory traceability and anti-counterfeit assurance. Use Value: Data Polling and Toggle Bit allow deterministic firmware update completion detection, meeting IEC 62304 software lifecycle requirements. |
Use Scenario: Retaining engine calibration maps and adaptive learning parameters in Tier-1 automotive ECUs where infrequent but mission-critical updates occur. IC Role / Device Role / Timing Role: Field-upgradable nonvolatile storage interfaced directly to 16-bit MCU; CE/OE dual-control prevents bus conflicts during CAN-triggered reprogramming. Use Value: Main memory erase (30H command) allows selective calibration table updates without erasing protected bootloader or safety monitor code. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F1024-55VI | Same die, industrial temperature range (−40°C to +85°C); higher standby current (300 µA vs. 100 µA) | Required for under-hood automotive or outdoor base station use; not suitable for cost-sensitive commercial designs | Select AT49F1024-55VI only when extended temperature operation is mandatory; otherwise AT49F1024-55VC offers lower cost and power |
| SST39VF100-55-4C-NHE | 1 Mbit (64K × 16), 55 ns access, but uses different command set and lacks boot block lockout; 3.3V/5V tolerant | Compatible for basic read/write functions but requires firmware modification to replace boot protection and erase algorithms | Use SST39VF100-55-4C-NHE only if 3.3V interface compatibility is needed; AT49F1024-55VC provides superior security and legacy 5V integration |
Compared with AT49F1024-55VI, the AT49F1024-55VC reduces standby power by 67% and cost for commercial-temperature applications; compared with SST39VF100-55-4C-NHE, it delivers unique boot block lockout and Atmel-specific command compatibility essential for secure firmware update workflows.
Availability
AT49F1024-55VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, telecom line card boot code, and medical diagnostic equipment BIOS requiring stable component supply and long-term obsolescence management.
Supply support for AT49F1024-55VC 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 innovator specializing in microcontrollers, Flash memory, and secure authentication solutions.
The AT49F1024 product line delivers 5V-only Flash memory optimized for legacy 16-bit embedded systems requiring robust in-system reprogrammability and hardware-secured boot code storage.
FAQ
What is the operating temperature range for AT49F1024-55VC?
The AT49F1024-55VC is rated for commercial temperature operation from 0°C to +70°C. This range is defined in the ordering information table and confirmed by DC/AC operating range specifications. The "VC" suffix explicitly denotes commercial grade, distinguishing it from the industrial-grade "VI" variant. AT49F1024-55VC must not be operated outside this range without derating analysis.
Does AT49F1024-55VC support hardware write protection independent of software commands?
Yes, AT49F1024-55VC includes three hardware data protection mechanisms: VCC sense circuitry that disables programming below 3.8 V, active inhibition when OE is low or CE/WE are high, and a 15 ns noise filter on WE and CE inputs. These operate autonomously without firmware intervention, preventing spurious writes during power-up/down or EMI events.
How is boot block lockout status verified on AT49F1024-55VC?
Boot block lockout status is verified by entering Software Product Identification mode (5555H/AA → 2AAA/55 → 5555H/90), then reading address 0002H. If I/O0 returns high, the lockout is active; if low, the boot block remains writable. This method is documented in the Boot Block Lockout Detection section and requires no external hardware.
What package type does AT49F1024-55VC use, and how does it differ from AT49F1025 variants?
AT49F1024-55VC uses a 40-lead VSOP (10 mm × 14 mm) package, while AT49F1025 variants use 44-lead PLCC. The "49F1024" and "49F1025" share identical silicon and electrical specs; only package and pin count differ. VSOP enables thinner board profiles and reflow-compatible assembly, whereas PLCC supports socket-based prototyping.
Can AT49F1024-55VC be programmed using standard EPROM programmers?
No, AT49F1024-55VC requires command-based programming via its parallel interface - not UV-erasable EPROM protocols. It accepts specific six-byte command sequences (e.g., 5555H/AA → 2AAA/55 → 5555H/A0) for word programming. Standard EPROM programmers lack the timing and command logic to execute these sequences and will not function with AT49F1024-55VC.
AT49F1024-55VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-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:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT49F1024-55VC FAQ
1.How can I place an order for AT49F1024-55VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F1024-55VC 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 AT49F1024-55VC reliable?
The price and inventory of AT49F1024-55VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F1024-55VC is usually 5 days.
3.What payment methods are accepted for AT49F1024-55VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F1024-55VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F1024-55VC?
AT49F1024-55VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F1024-55VC 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 AT49F1024-55VC?
For technical support, including AT49F1024-55VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F1024-55VC requirements.
6.How does Aetrix verify that AT49F1024-55VC is sourced from the original manufacturer or authorized distributors?
All AT49F1024-55VC 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 AT49F1024-55VC meets industry standards.
7.What is the process for return or replacement of AT49F1024-55VC?
All AT49F1024-55VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F1024-55VC, 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 AT49F1024-55VC part is unused and in its original packaging.
Return procedure for AT49F1024-55VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F1024-55VC Tags
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