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Microchip Technology AT49BV040A-90JI
- Part No.:
- AT49BV040A-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV040A-90JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,002
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Product details
Overview
AT49BV040A-90JI from Atmel is a 4 Mbit (512K × 8) single-supply 2.7–3.6 V in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 90 ns read access time, 30 µs/byte programming, 7-second sector erase, 10,000 write cycles, and hardware data protection - enabling reliable firmware updates in industrial controllers and boot loaders.
For engineers reviewing the AT49BV040A-90JI datasheet, AT49BV040A-90JI pinout, AT49BV040A-90JI application, or AT49BV040A-90JI equivalent, this page provides verified technical context, sector architecture details, boot block lockout behavior, DATA polling/toggle bit timing, and real-world design implications for flash-based boot memory integration.
Technical Context
The AT49BV040A-90JI implements a sector-erasable Flash architecture with one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks (04000H–05FFFH, 06000H–07FFFH), and eight main memory blocks (32 KB + seven 64 KB). Erase and program operations are executed via six-cycle software command sequences using standard CE/OE/WE control logic without external high-voltage circuitry.
It supports EPROM-compatible read access with CE/OE active-low selection and WE high, while byte programming and sector/chip erase rely on internal state machines triggered by specific address/data patterns (e.g., 555H/AAH, AAAH/55H). Boot block lockout is enabled via a deterministic six-command sequence and permanently disables further writes to addresses 00000H–03FFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full firmware image storage for 8-bit MCUs with up to 512 KB code space. |
| Read Access Time | 90 ns - determines maximum bus clock frequency (≤11 MHz) for zero-wait-state operation in 8051 or similar architectures. |
| Byte Programming Time | 30 µs typical - enables field-updatable configuration parameters at ~33 kB/s sustained write rate per sector. |
| Sector Erase Time | 7 seconds max - defines minimum latency for over-the-air firmware patching when updating individual 8 KB or 64 KB sections. |
| Write Endurance | 10,000 cycles - qualifies for industrial logging applications requiring daily firmware revision over 27 years. |
| Supply Voltage Range | 2.7–3.6 V - compatible with single-cell Li-ion (3.0–3.6 V) or regulated 3.3 V rails without level-shifting. |
| Standby Current | 50 µA CMOS - reduces system power budget by <10 µW in always-on embedded devices with periodic wake-up. |
Pinout & Package
AT49BV040A-90JI is packaged in a 32-lead PLCC (32J) with 1.27 mm pitch, compliant with JEDEC MS-016 Variation AE. Dimensions: 12.42 mm × 12.42 mm × 3.35 mm (max height), lead coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit addressing supports full 512K-byte memory map; A11 is don't-care in command mode for sector address aliasing. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8080/8051-style microprocessor buses; supports DATA polling on I/O7 and toggle bit on I/O6. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; used with WE for command latching. |
| OE | Output Enable | Active-low output gate; controls data bus tristate during reads; high during programming/erase to prevent contention. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data during command sequences and byte programming. |
| VCC | Power Supply | 2.7–3.6 V supply; internal voltage regulator ensures stable core operation across battery discharge curve. |
| GND | Ground Reference | Signal and power return; decoupling capacitor (0.1 µF) required within 10 mm of VCC/GND pins for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB region (00000H–03FFFH) permanently protected after command sequence - secures bootloader integrity against accidental overwrite. |
| DATA Polling Detection | I/O7 returns complement of programmed byte until completion - eliminates need for fixed delay timers in host firmware during byte programming. |
| Toggle Bit Status Monitoring | I/O6 toggles during program/erase; stops when complete - provides asynchronous status feedback without dedicated interrupt lines. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filter (<15 ns pulses ignored), and control-line inhibit (OE low/CE high/WE high blocks writes) - prevents spurious writes in noisy industrial environments. |
| Green Packaging Option | Pb/Halide-free PLCC package - meets RoHS Directive 2011/65/EU and JESD204B compliance for environmentally regulated deployments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding startup code and runtime configuration; accessed during cold boot and firmware update cycles. Use Value: 90 ns read speed enables deterministic boot timing; 10,000 write cycles support lifetime field updates; hardware lockout prevents corruption of safety-critical bootloader. | Use Scenario: Holding certified bootloader and diagnostic routines in Class II medical instruments requiring traceable firmware revisions and secure boot verification. IC Role / Device Role / Timing Role: Secure boot memory with write-protected boot sector; stores immutable startup instructions validated before loading application firmware. Use Value: Boot block lockout ensures regulatory-compliant firmware integrity; 50 µA standby current extends battery life in portable diagnostic tools; green packaging satisfies IEC 60601-1 environmental requirements. |
| Automotive Body Control Module | Smart Energy Meter Firmware |
Use Scenario: Storing lighting control logic and sensor calibration data in automotive BCMs exposed to -40°C to +85°C ambient and load-dump transients. IC Role / Device Role / Timing Role: In-system reprogrammable flash for OTA updates; operates as memory-mapped peripheral on CAN-connected MCU bus. Use Value: 2.7–3.6 V operation tolerates brown-out conditions; sector erase allows partial updates without full reflash; DATA polling simplifies update driver implementation. | Use Scenario: Retaining tariff tables, communication stack binaries, and tamper logs in utility-grade smart meters deployed in outdoor enclosures with limited maintenance windows. IC Role / Device Role / Timing Role: Long-life nonvolatile storage for firmware and usage history; updated annually via HAN or PLC interface. Use Value: 7-second sector erase enables fast field upgrades; 10,000 cycle endurance exceeds 20-year meter lifespan; PLCC package resists thermal cycling stress in sealed housings. |
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; no boot block lockout; uses different command set (SST-specific). | Lacks hardware-protected boot sector; requires modified firmware drivers for erase/write commands. | Select when boot security is not required and SST's faster 18 µs byte programming is prioritized over lockout capability. |
| MX29LV400CTTI-90G | 4 Mbit, 90 ns, 3.0–3.6 V; top-boot configuration (00000H–01FFFH); supports CFI query mode. | Smaller 8 KB boot sector; CFI compatibility simplifies auto-detection in generic flash programmers but lacks Atmel's DATA polling simplicity. | Select for CFI-based toolchain compatibility or when smaller boot region suffices; verify sector map alignment with existing layout. |
Compared with SST39VF400A-90-4C-NHE and MX29LV400CTTI-90G, the AT49BV040A-90JI uniquely combines 16 KB hardware-lockable boot block, unified command protocol across all operations, and dual-status monitoring (DATA polling + toggle bit), making it optimal for safety-critical embedded boot memory where firmware integrity and deterministic update timing are mandatory.
Availability
AT49BV040A-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive body control module applications requiring stable component supply and long-term lifecycle support.
Supply support for AT49BV040A-90JI 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 U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT49BV040A-90JI belongs to Atmel's legacy 2.7 V-only Flash memory product line, designed specifically for cost-sensitive, low-power embedded systems needing in-system reprogrammability without high-voltage programming circuitry.
FAQ
What is the maximum operating temperature range for the AT49BV040A-90JI?
The AT49BV040A-90JI is rated for industrial temperature operation from -40°C to +85°C, as confirmed in Section 7 of the datasheet. This range applies to both read and program/erase operations under specified VCC (2.7–3.6 V) and timing conditions, making it suitable for deployment in harsh environments such as factory automation and outdoor metering equipment.
Does the AT49BV040A-90JI support true 3.3 V-only operation without requiring 12 V or 5 V for programming?
Yes, the AT49BV040A-90JI supports true single 2.7–3.6 V supply operation for both read and write functions. No external high-voltage generator is needed - all programming and erase commands execute using only the VCC rail, as stated in the Features section and verified in Section 4.2 (Command Sequences) of the datasheet.
How is boot block protection enabled on the AT49BV040A-90JI?
Boot block protection on the AT49BV040A-90JI is enabled via a 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 16 KB boot block (00000H–03FFFH) becomes permanently write-protected, as detailed in Section 4.5 and Figure 26.
Can the AT49BV040A-90JI be used as a direct replacement for the AT49BV040A-70JI in an existing design?
Yes, the AT49BV040A-90JI is functionally identical to the AT49BV040A-70JI except for its 90 ns (vs. 70 ns) read access time. All pinouts, command sets, voltage ranges, sector maps, and timing parameters other than tACC/tCE are identical, allowing drop-in substitution where 90 ns read performance is acceptable.
What methods does the AT49BV040A-90JI provide to detect the end of a programming cycle?
The AT49BV040A-90JI provides two hardware-supported methods: (1) DATA polling - reading the last programmed byte returns its complement on I/O7 until completion, then true data; (2) Toggle bit - I/O6 toggles during programming and stops when complete. Both are usable at any time during the cycle, as defined in Sections 4.7 and 4.8 of the datasheet.
AT49BV040A-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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-PLCC (13.97x11.43)
AT49BV040A-90JI FAQ
1.How can I place an order for AT49BV040A-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-90JI 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-90JI reliable?
The price and inventory of AT49BV040A-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-90JI is usually 5 days.
3.What payment methods are accepted for AT49BV040A-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-90JI?
AT49BV040A-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-90JI 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-90JI?
For technical support, including AT49BV040A-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-90JI requirements.
6.How does Aetrix verify that AT49BV040A-90JI is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-90JI 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-90JI meets industry standards.
7.What is the process for return or replacement of AT49BV040A-90JI?
All AT49BV040A-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-90JI, 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-90JI part is unused and in its original packaging.
Return procedure for AT49BV040A-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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