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Microchip Technology AT49BV002-90VC
- Part No.:
- AT49BV002-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV002-90VC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,756
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Product details
Overview
AT49BV002-90VC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply Flash memory IC designed for in-system reprogrammability in embedded boot code storage. It operates from 2.7–3.6 V, delivers 70 ns read access time, supports sector-erase architecture with 16 KB boot block and hardware data protection, and is used in microcontroller-based firmware update systems requiring nonvolatile, field-upgradable storage.
For engineers reviewing the AT49BV002-90VC datasheet, AT49BV002-90VC pinout, AT49BV002-90VC application, or AT49BV002-90VC equivalent, key selection criteria include its 32-pin VSOP package, boot-block lockout capability, DATA polling/Toggle Bit programming verification, and compatibility with standard EPROM-like CE/OE/WE control timing in industrial temperature range designs.
Technical Context
The AT49BV002-90VC implements a command-register-based architecture using standard microprocessor write cycles to execute chip erase, sector erase, byte programming, and boot-lock enable sequences. Its internal logic handles timing for erase (10 s max) and programming (30 µs typical per byte), eliminating external clocks or high-voltage generators.
It features dual-line control (CE + OE) for bus contention avoidance, RESET-driven boot-block override at 12 V, and hardware safeguards including VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulse rejection), and program-inhibit via CE/OE/WE state enforcement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly replaces EPROMs in 8-bit bus systems without address decoding changes. |
| Read Access Time | 90 ns maximum - ensures compatibility with 11 MHz bus timing in legacy microcontroller interfaces. |
| Supply Voltage | 2.7 V to 3.6 V - enables direct connection to 3.3 V logic rails without level-shifting or charge pumps. |
| Active Current | 25 mA typical - supports low-power active operation in battery-backed or energy-constrained embedded hosts. |
| Standby Current | 50 µA CMOS - minimizes quiescent power draw during firmware idle states in always-on systems. |
| Erase Cycle Time | 10 seconds maximum for full chip - enables predictable firmware update windows in field-deployed devices. |
| Endurance | 10,000 program/erase cycles - qualifies for frequent bootloader updates over product lifetime. |
| Operating Temperature | 0°C to +70°C (Commercial) - validated for use in office, consumer, and non-automotive industrial environments. |
Pinout & Package
AT49BV002-90VC uses a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body, with gull-wing leads and JEDEC-standard pinout. Pin 1 is located at the bottom-left corner (marking dot adjacent), and pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte-level access, A17 selects upper/lower half in extended configurations. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and other 8-bit microcontrollers; supports true read/write without external transceivers. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - enables multi-device memory mapping. |
| OE | Output Enable | Active-low output control; decouples data bus during standby or write cycles to prevent contention on shared buses. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence - critical for reliable command execution. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input overrides boot-block lockout - used only during recovery procedures. |
| VCC | Power Supply | +2.7 V to +3.6 V supply; bypass capacitor required near pin for stable read/write margins and noise immunity. |
| GND | Ground Reference | Signal and power ground reference; requires low-inductance connection to minimize switching noise during erase/program pulses. |
| DC | No Connect | Pin 9 in TSOP/VSOP packages - must remain unconnected; floating or driven signals cause undefined behavior or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block | 16 KB boot block (00000H–03FFFH) + two 8 KB parameter blocks + two main memory blocks (96 KB/128 KB) - enables secure bootloader storage while allowing independent firmware partition updates. |
| Hardware Boot-Block Lockout | Command-enabled permanent write protection of boot sector; prevents accidental overwrite of startup code during field firmware upgrades. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggle provide real-time, software-visible status of program/erase completion - eliminates need for fixed delay timers in host firmware. |
| Single 3V Supply Operation | No external 5 V or 12 V required for read/write/erase - simplifies power design and reduces BOM cost in 3.3 V systems. |
| Standard EPROM Interface Timing | CE/OE/WE control matches industry-standard EPROM timing models - allows drop-in replacement without modifying existing microcontroller memory controller logic. |
| Hardware Data Protection | VCC sense, noise filtering, and state-based inhibit prevent spurious writes due to brown-out, ESD, or bus glitches - improves field reliability. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing immutable boot code and field-upgradable application firmware in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped at reset vector; provides fast 90 ns read access to initialize CPU and load runtime firmware from secondary storage. Use Value: Boot-block lockout ensures certified safety-critical startup routines remain unaltered across 10,000+ field updates, meeting IEC 61508 SIL-2 requirements. |
Use Scenario: Holding FDA-cleared bootloader and calibration data in portable diagnostic equipment requiring traceable, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: Secure configuration memory accessed during power-on self-test; supports DATA polling to synchronize host MCU firmware validation before enabling analog subsystems. Use Value: 50 µA standby current extends battery life between calibrations; hardware VCC sense prevents corruption during low-battery brown-out events. |
| Consumer Set-Top Box Update Storage | Automotive Infotainment Boot ROM |
Use Scenario: Hosting upgradable middleware and UI assets in cable/satellite receivers where over-the-air updates must preserve core boot functionality. IC Role / Device Role / Timing Role: Sector-erasable Flash memory interfaced via 8-bit parallel bus; enables selective reprogramming of application partitions without erasing boot code. Use Value: 10-second chip erase enables sub-minute firmware recovery; VSOP package fits tight board space constraints in slim-profile enclosures. |
Use Scenario: Storing ASIL-B compliant boot firmware in head-unit ECUs where functional safety mandates separation of boot and application code. IC Role / Device Role / Timing Role: Primary boot memory mapped at 0x00000; uses RESET-driven 12 V override to recover corrupted boot sectors during service mode. Use Value: Commercial temperature grade (0°C–70°C) meets cabin ambient requirements; 2.7–3.6 V operation aligns with automotive 3.3 V power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-90-4C-NHE | 4 Mbit density (512K × 8), 90 ns access, 3.0–3.6 V supply; lacks boot-block lockout and RESET override. | Higher capacity suits larger firmware images but requires modified address decoding; no hardware-protected boot region. | Select when >2 Mbit storage is needed and boot security is managed in software or external logic. |
| MX29LV040CTTI-90G | 4 Mbit (512K × 8), 90 ns access, 2.7–3.6 V; includes CFI-compliant command set and 64-byte page programming. | CFI support eases driver portability across platforms; page programming improves bulk write speed vs. byte-by-byte. | Prefer for new designs needing standardized Flash abstraction layers or faster firmware download throughput. |
Compared with SST39VF020-90-4C-NHE and MX29LV040CTTI-90G, the AT49BV002-90VC offers unique boot-block lockout and 12 V RESET override for secure, recoverable bootloader storage - critical where firmware integrity is enforced by hardware rather than software checks.
Availability
AT49BV002-90VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and consumer set-top box update storage requiring stable component supply across long-lifecycle production programs.
Supply support for AT49BV002-90VC 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 manufacturing, documentation, and technical assistance.
The AT49BV002-90VC belongs to Atmel's Battery-Voltage™ Flash memory family, engineered for reliable in-system reprogramming in 3 V embedded systems where low-voltage operation and boot-code security are essential.
FAQ
What is the operating voltage range for the AT49BV002-90VC?
The AT49BV002-90VC operates from 2.7 V to 3.6 V DC. This single-supply range eliminates the need for separate 5 V programming voltages and enables direct integration into 3.3 V logic systems. Operation below 2.7 V disables programming functions via internal VCC sense circuitry, preventing data corruption during brown-out conditions. The AT49BV002-90VC maintains full read functionality across this entire range.
Does the AT49BV002-90VC support hardware write protection for the boot sector?
Yes, the AT49BV002-90VC includes a hardware-enforced boot-block lockout feature. Once enabled via a six-cycle command sequence, the 16 KB boot sector (00000H–03FFFH) becomes permanently protected against erase and programming with ≤5.5 V inputs. This ensures bootloader integrity in field-deployed systems. The AT49BV002-90VC also supports 12 V RESET override for emergency recovery.
How is programming completion detected on the AT49BV002-90VC?
The AT49BV002-90VC provides two hardware methods: DATA polling (I/O7 returns complement of written data until completion, then true data) and Toggle Bit (I/O6 toggles during operation, stops when complete). Both methods allow the host MCU to poll asynchronously without fixed delays. These features are integral to the AT49BV002-90VC's command-register architecture and require no external timing components.
What package type does the AT49BV002-90VC use, and what are its key mechanical features?
The AT49BV002-90VC uses a 32-lead Very Small Outline Package (VSOP) measuring 8 mm × 14 mm with gull-wing leads. It conforms to JEDEC MO-187AC standards, features a 0.5 mm lead pitch, and has pin 1 marked by a dot in the bottom-left corner. This surface-mount package supports automated assembly and provides thermal performance suitable for commercial-temperature applications of the AT49BV002-90VC.
Can the AT49BV002-90VC be used as a direct replacement for standard EPROMs like the 27C256?
Yes, the AT49BV002-90VC is pin-compatible and functionally compatible with 27C256 EPROMs in read mode, using identical CE/OE/WE control signaling and 8-bit data bus timing. However, unlike EPROMs, the AT49BV002-90VC requires specific command sequences for programming and erase - no UV erasure or external 12.5 V programming voltage is needed, making it suitable for in-circuit reprogramming without socket removal.
AT49BV002-90VC 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV002-90VC FAQ
1.How can I place an order for AT49BV002-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002-90VC 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 AT49BV002-90VC reliable?
The price and inventory of AT49BV002-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002-90VC is usually 5 days.
3.What payment methods are accepted for AT49BV002-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002-90VC?
AT49BV002-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002-90VC 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 AT49BV002-90VC?
For technical support, including AT49BV002-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002-90VC requirements.
6.How does Aetrix verify that AT49BV002-90VC is sourced from the original manufacturer or authorized distributors?
All AT49BV002-90VC 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 AT49BV002-90VC meets industry standards.
7.What is the process for return or replacement of AT49BV002-90VC?
All AT49BV002-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002-90VC, 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 AT49BV002-90VC part is unused and in its original packaging.
Return procedure for AT49BV002-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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