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Microchip Technology AT49BV040A-90VI
- Part No.:
- AT49BV040A-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040A-90VI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,603
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Product details
Overview
AT49BV040A-90VI from Atmel is a 4 Mbit (512K × 8) single-supply 2.7–3.6 V in-system reprogrammable Flash memory IC with 90 ns read access time, 30 µs/byte programming, 7-second sector erase, and hardware data protection. It features a 16K-byte boot block with programmable lockout, two 8K-byte parameter blocks, and eight main memory blocks - used in embedded firmware storage and boot code retention for industrial microcontroller systems.
For engineers reviewing the AT49BV040A-90VI datasheet, AT49BV040A-90VI pinout, AT49BV040A-90VI application, or AT49BV040A-90VI equivalent, this page delivers verified timing specs, sector architecture details, DATA polling and toggle bit end-of-cycle detection, boot block lockout activation sequence, and real-world design constraints for firmware update reliability and power-sensitive operation.
Technical Context
The AT49BV040A-90VI implements a standard parallel NOR Flash interface with CE/OE/WE control logic, supporting EPROM-like read access and software command-based byte programming and sector erasure. Its internal program control includes automatic pulse generation, DATA polling on I/O7, and toggle-bit monitoring on I/O6.
It uses a hierarchical sector architecture: one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks (04000H–05FFFH and 06000H–07FFFH), and eight main memory blocks (32K + seven 64K). Boot block lockout is enabled via a six-cycle command sequence and permanently prevents reprogramming once activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - supports full firmware image storage for mid-complexity microcontrollers. |
| Read Access Time | 90 ns max - determines minimum bus cycle time for CPU read operations without wait states at 11 MHz system clock. |
| Byte Programming Time | 30 µs typical - defines minimum interval between successive byte writes during field firmware updates. |
| Sector Erase Time | 7 seconds max - sets worst-case latency for updating parameter blocks or application segments without full chip erase. |
| 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 | 15 mA typical - impacts thermal budget and power supply sizing in always-on embedded controllers. |
| Standby Current | 50 µA CMOS - allows low-power sleep modes in battery-backed or energy-harvested systems. |
| Endurance | 10,000 program/erase cycles - defines usable lifetime for frequently updated configuration or logging sectors. |
Pinout & Package
AT49BV040A-90VI is packaged in a 32-lead VSOP (8 × 14 mm), compliant with JEDEC MO-142 Variation BA. Pin count and signal mapping match 32-lead TSOP and PLCC variants, enabling footprint interchangeability within same package family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A18 are don't-care in command cycles. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device enable state. |
| OE | Output Enable | Active-low output gate; used with CE to prevent bus contention; high-Z when deasserted. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries data during read, byte programming, and command entry; supports DATA polling on I/O7 and toggle bit on I/O6. |
| VCC | Power Supply | 2.7–3.6 V single supply; powers core logic and I/O buffers; internal voltage sensing inhibits programming if below 1.8 V. |
| GND | Ground Reference | Common return path for all signals and power; required for noise immunity and proper DATA polling/toggle bit operation. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16K-byte region (00000H–03FFFH) permanently protected after six-command sequence - ensures bootloader integrity during field firmware updates. |
| DATA Polling Detection | I/O7 returns complement of programmed byte until completion, then true data - eliminates need for fixed delay timers in host firmware. |
| Toggle Bit End-of-Cycle Signal | I/O6 toggles during programming/erase; stops when complete - provides asynchronous status without dedicated status pins. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits write), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks programming) - prevents accidental corruption in noisy environments. |
| Green Packaging Option | Pb/Halide-free VSOP package - meets RoHS compliance requirements for industrial and medical product certifications. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware and calibration tables in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability; 90 ns read access supports real-time scan cycle execution; sector erase enables partial updates without halting operation. Use Value: Enables remote firmware patches via serial interface while preserving boot loader in locked 16K boot block - reducing downtime and service calls. | Use Scenario: Holding certified bootloader and safety-critical initialization routines in portable diagnostic equipment requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure boot memory with permanent lockout capability; 50 µA standby current extends battery life in handheld ultrasound or ECG units. Use Value: Prevents unauthorized modification of boot code post-certification - satisfies IEC 62304 software lifecycle requirements for Class B/C devices. |
| Automotive Body Control Module (BCM) | Telecom Remote Node Configuration |
Use Scenario: Storing vehicle-specific configuration data (e.g., door lock behavior, lighting profiles) and minor firmware patches in BCMs across production variants. IC Role / Device Role / Timing Role: Parameter block storage (two 8K sections) accessible via CAN gateway-initiated updates; 30 µs/byte programming minimizes flash wear during frequent small writes. Use Value: Allows dealership-level personalization without full ECU reflashing - reduces service time and avoids risk of corrupting main application code. | Use Scenario: Holding network protocol stacks and site-specific settings (e.g., frequency bands, encryption keys) in outdoor wireless base station remote nodes. IC Role / Device Role / Timing Role: Field-upgradable configuration memory; 7-second sector erase enables rapid reconfiguration during over-the-air (OTA) updates without disrupting RF transmission. Use Value: Supports zero-touch provisioning and dynamic spectrum allocation - critical for multi-tenant shared infrastructure deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-90-4C-NHE | 4 Mbit, 90 ns, 3.0–3.6 V supply; no boot block lockout; supports CFI query mode. | Lacks hardware-enforced boot sector protection; requires external software management of critical code regions. | Choose when CFI compatibility and broader vendor support outweigh boot security needs. |
| MX29LV400CTTI-90G | 4 Mbit, 90 ns, 3.0–3.6 V; top-boot configuration (boot block at highest addresses); different command set. | Boot block resides at F0000H–FFFFFH instead of 00000H–03FFFH - requires PCB address decoding changes. | Prefer for designs already using Macronix toolchains or needing top-boot layout flexibility. |
Compared with SST39VF400A-90-4C-NHE and MX29LV400CTTI-90G, the AT49BV040A-90VI uniquely offers bottom-boot architecture with hardware-locked 16K boot sector, making it optimal for legacy-compatible embedded systems where bootloader integrity is enforced at silicon level without software overhead.
Availability
AT49BV040A-90VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, and automotive body control module configuration requiring stable component supply across extended product lifecycles.
Supply support for AT49BV040A-90VI 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT49BV040A-90VI belongs to Atmel's legacy parallel Flash memory product line, designed specifically for in-system reprogrammability in resource-constrained embedded systems requiring reliable, low-voltage firmware storage with hardware-level boot protection.
FAQ
What is the maximum operating temperature range for the AT49BV040A-90VI?
The AT49BV040A-90VI is rated for industrial operation from –40°C to +85°C. This range is confirmed in the "DC and AC Operating Range" section of the datasheet and applies to both active and standby modes. The device maintains full specification compliance-including 90 ns read access and 30 µs byte programming-across this entire temperature span, making it suitable for under-hood automotive modules and factory-floor controllers.
Does the AT49BV040A-90VI support hardware reset or power-on reset functionality?
The AT49BV040A-90VI does not include a dedicated RESET pin. Upon power-up, it automatically enters read or standby mode depending on CE/OE/WE logic levels; no external reset signal is required. However, the Product Identification mode can be entered via hardware (applying VH to A9) or software commands, and exiting that mode returns the AT49BV040A-90VI to standard operation. No internal POR circuitry is documented - system-level reset coordination remains the host controller's responsibility.
How is boot block lockout enabled on the AT49BV040A-90VI, and can it be reversed?
Boot block lockout on the AT49BV040A-90VI is enabled by executing a precise six-cycle command sequence: load AAh to address 555H, 55h to AAAH, 80h to 555H, AAh to 555H, 55h to AAAH, then 40h to 555H - followed by a 1-second pause. Once activated, the 16K boot block (00000H–03FFFH) becomes permanently read-only; no command or voltage condition can reverse the lock. This irreversible feature is explicitly stated in the datasheet's "Boot Block Programming Lockout" section.
Can the AT49BV040A-90VI be used with a 5 V microcontroller bus interface?
No, the AT49BV040A-90VI is strictly a 2.7–3.6 V device and is not 5 V tolerant. Its absolute maximum input voltage is +6.25 V, but DC characteristics (VIL = 0.6 V, VIH = 2.0 V) and AC timing are specified only for 3.3 V operation. Connecting directly to a 5 V bus risks violating input thresholds and may cause unreliable reads or unintended command execution. Level-shifting circuitry is mandatory for interfacing with 5 V microcontrollers.
What packaging options are available for the AT49BV040A-90VI, and is the VSOP pinout identical to TSOP?
The AT49BV040A-90VI is offered in 32-lead VSOP (8 × 14 mm), TSOP (8 × 20 mm), and PLCC packages - all with identical pin numbering and signal assignment per the datasheet's "Pin Configurations" section. The VSOP and TSOP share the same 32-pin Type I footprint definition (JEDEC MO-142), differing only in body dimensions and lead pitch. This allows drop-in replacement between AT49BV040A-90VI (VSOP) and AT49BV040A-90TI (TSOP) on compatible PCBs.
AT49BV040A-90VI 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:
- 4Mbit
- Memory Organization:
- 512K 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV040A-90VI FAQ
1.How can I place an order for AT49BV040A-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-90VI 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 AT49BV040A-90VI reliable?
The price and inventory of AT49BV040A-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-90VI is usually 5 days.
3.What payment methods are accepted for AT49BV040A-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-90VI?
AT49BV040A-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-90VI 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 AT49BV040A-90VI?
For technical support, including AT49BV040A-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-90VI requirements.
6.How does Aetrix verify that AT49BV040A-90VI is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-90VI 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 AT49BV040A-90VI meets industry standards.
7.What is the process for return or replacement of AT49BV040A-90VI?
All AT49BV040A-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-90VI, 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 AT49BV040A-90VI part is unused and in its original packaging.
Return procedure for AT49BV040A-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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