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Microchip Technology AT49BV040A-70JU-T
- Part No.:
- AT49BV040A-70JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV040A-70JU-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49BV040A-70JU-T from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) single-supply, in-system reprogrammable Flash memory IC designed for embedded boot code and parameter storage. It operates from 2.7V to 3.6V, delivers 70 ns read access time, supports byte-by-byte programming at 30 µs/byte, and features hardware data protection and DATA polling for end-of-program detection. It is used in industrial microcontroller systems requiring reliable, low-voltage firmware storage with sector-level erase control.
For engineers reviewing the AT49BV040A-70JU-T datasheet, AT49BV040A-70JU-T pinout, AT49BV040A-70JU-T application, or AT49BV040A-70JU-T equivalent, this page provides verified technical context, validated pin functions, confirmed sector architecture (1×16K boot block + 2×8K parameter blocks + 8 main memory blocks), real-world power metrics (15 mA active / 50 µA standby), and two documented alternative parts for legacy design continuity.
Technical Context
The AT49BV040A-70JU-T implements a standard parallel Flash interface with CE/OE/WE control logic, enabling EPROM-like read operation and command-based write/erase sequences. Its internal program controller manages byte programming and sector/chip erase without external high-voltage support, using only 2.7–3.6 V supply.
It features dual-sector protection mechanisms: hardware-based VCC sense (<1.8 V inhibits programming) and software-enabled boot block lockout (16K-byte region at 00000H–03FFFH). Erase operations are internally timed - chip erase completes in ≤12 seconds, sector erase in ≤7 seconds - with toggle-bit and DATA polling for cycle completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - sufficient for boot loader, configuration tables, and firmware patches in resource-constrained MCUs. |
| Read Access Time | 70 ns max - enables direct execution from Flash (XIP) in timing-critical 8/16-bit bus systems without wait states at 10–14 MHz clock rates. |
| Byte Programming Time | 30 µs typical - allows rapid field updates of small configuration parameters or calibration data without full-block erasure overhead. |
| Erase Cycle Time | 7 seconds max for sector erase, 12 seconds max for chip erase - balances speed and reliability for infrequent firmware upgrades in industrial controllers. |
| Supply Voltage Range | 2.7 V to 3.6 V - compatible with single-cell Li-ion, 3.3 V logic rails, and battery-backed systems without level-shifting circuitry. |
| Standby Current | 50 µA CMOS - supports ultra-low-power sleep modes in portable or energy-harvesting devices where background memory retention is required. |
| Endurance | 10,000 program/erase cycles - validated for applications involving periodic field updates (e.g., firmware versioning, sensor calibration logs). |
Pinout & Package
AT49BV040A-70JU-T is packaged in a 32-lead PLCC (Plastic Leaded Chip Carrier), JEDEC MS-016 compliant, with 1.27 mm pitch and pin 1 identifier marked by corner chamfer. The package is Pb/halide-free (Green option), rated for industrial temperature range (−40°C to +85°C).
| 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 during command sequences per datasheet note. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read data output and program data input; supports DATA polling on I/O7 and toggle-bit detection on I/O6. |
| CE | Chip Enable | Active-low global enable; must be low with OE low and WE high for read access; used with WE for command latching in programming/erase cycles. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high - prevents bus contention in shared-memory systems. |
| WE | Write Enable | Active-low write strobe; controls latching of address/data during programming/erase commands; toggling OE or CE also triggers toggle-bit mode. |
| VCC | Power Supply | 2.7–3.6 V primary supply; internal voltage regulation ensures stable core operation across rail variation; VCC sense disables programming below ~1.8 V. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic; decoupling capacitor placement near pin 16 is critical for noise immunity during fast transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | One 16K-byte boot block (00000H–03FFFH) with programmable lockout, two 8K-byte parameter blocks, and eight main memory blocks (one 32K + seven 64K) - enables granular firmware update without risking boot integrity. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibit (OE low / CE high / WE high blocks writes) - eliminates accidental overwrites during power transients or EMI events. |
| DATA Polling | Complement of last programmed byte appears on I/O7 until completion - allows host MCU to poll asynchronously without timers or interrupts, reducing firmware complexity. |
| Toggle Bit Detection | I/O6 toggles during active program/erase cycles - provides secondary, pin-level confirmation of operation status independent of data bus activity. |
| Green Packaging | Pb/halide-free PLCC (32J) - meets RoHS Directive 2011/65/EU and supports environmentally compliant manufacturing for industrial and medical equipment. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing boot loader and safety-critical firmware in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing XIP-capable instruction fetch and secure parameter storage with sector-level write protection. Use Value: Boot block lockout prevents corruption of startup code during remote firmware updates; 70 ns access enables deterministic real-time response in motion control loops. |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic instruments. IC Role / Device Role / Timing Role: Low-power configuration EEPROM replacement with byte-programmability and 10,000-cycle endurance for clinical recalibration events. Use Value: 50 µA standby current extends battery life between calibrations; sector erase isolates parameter updates from firmware regions, ensuring data integrity compliance. |
| Automotive Body Control Module (BCM) | Telecom Edge Node Parameter Storage |
|
Use Scenario: Holding vehicle-specific configuration (e.g., door lock logic, lighting profiles) in BCMs subject to extended temperature cycling. IC Role / Device Role / Timing Role: Industrial-grade Flash memory operating across −40°C to +85°C, interfacing directly with 8-bit MCU buses via CE/OE/WE. Use Value: 2.7–3.6 V operation tolerates automotive battery droop; hardware VCC sense prevents writes during cranking; PLCC package withstands thermal shock in under-hood environments. |
Use Scenario: Storing network provisioning data, encryption keys, and firmware patch metadata in DSL/cable modems deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Secure, field-reprogrammable nonvolatile memory with boot block protection to prevent unauthorized bootloader modification. Use Value: Boot block lockout (enabled via 6-cycle command sequence) ensures immutable root-of-trust; DATA polling simplifies host driver development for diverse SoC platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-NHE | Same density (4 Mbit), 70 ns access, 3.0–3.6 V supply; uses different command set (SST-style) and lacks boot block lockout feature. | No dedicated 16K protected boot sector; requires external logic or firmware management for secure boot code isolation. | Select when migrating from SST39VF400A footprint and command compatibility is prioritized over hardware-enforced boot protection. |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns, 2.7–3.6 V; includes CFI-compliant command set and 16K boot sector, but boot lockout is not hardware-gated - relies on software write-protection flags. | Boot sector protection depends on correct flag initialization and absence of errant writes; less robust against voltage glitch-induced corruption. | Choose for CFI-standard toolchain compatibility and broader ecosystem support, accepting increased firmware validation burden for boot security. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040A-70JU-T provides unique hardware-enforced boot block lockout with no software dependency, making it superior for safety-critical boot integrity - though its legacy Atmel command set may require driver adaptation in new designs.
Availability
AT49BV040A-70JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence planning.
Supply support for AT49BV040A-70JU-T 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 legacy Flash product support, including datasheets, application notes, and qualified second sources for industrial and automotive customers.
The AT49BV040A-70JU-T belongs to Atmel's legacy parallel 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 operating voltage range for the AT49BV040A-70JU-T?
The AT49BV040A-70JU-T operates from 2.7 V to 3.6 V DC. This single-supply range eliminates the need for separate programming voltages and supports direct integration with 3.3 V logic systems and battery-powered applications. Operation below 2.7 V disables programming via internal VCC sense, and the device enters read-only mode if VCC drops below ~1.8 V.
Does the AT49BV040A-70JU-T support hardware write protection for the boot sector?
Yes, the AT49BV040A-70JU-T includes a hardware-enforced boot block programming lockout feature. Once enabled via a six-cycle command sequence, the 16K-byte boot sector (00000H–03FFFH) becomes permanently immune to erase and program operations - even during chip erase - ensuring boot code integrity in mission-critical systems.
How is the end of a programming cycle detected on the AT49BV040A-70JU-T?
The AT49BV040A-70JU-T supports two hardware methods: DATA polling (I/O7 returns complement of last written byte until completion) and toggle-bit detection (I/O6 toggles during active programming). Both allow the host system to monitor completion without fixed delays, improving efficiency in interrupt-driven or polled firmware implementations.
What package type is used for the AT49BV040A-70JU-T?
The AT49BV040A-70JU-T uses a 32-lead PLCC (Plastic Leaded Chip Carrier), designated as package code "32J" per Atmel's ordering information. It is Pb/halide-free (Green), JEDEC MS-016 compliant, and rated for industrial temperature range (−40°C to +85°C), with pin 1 identified by a corner chamfer.
Can the AT49BV040A-70JU-T be erased at the sector level?
Yes, the AT49BV040A-70JU-T supports individual sector erase for all memory regions: the 16K-byte boot block, two 8K-byte parameter blocks, and eight main memory blocks (32K + seven 64K). Sector erase uses a six-bus-cycle command and completes in ≤7 seconds, enabling targeted updates without disturbing unrelated firmware or configuration data.
AT49BV040A-70JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 70 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-70JU-T FAQ
1.How can I place an order for AT49BV040A-70JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-70JU-T 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-70JU-T reliable?
The price and inventory of AT49BV040A-70JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-70JU-T is usually 5 days.
3.What payment methods are accepted for AT49BV040A-70JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-70JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-70JU-T?
AT49BV040A-70JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-70JU-T 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-70JU-T?
For technical support, including AT49BV040A-70JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-70JU-T requirements.
6.How does Aetrix verify that AT49BV040A-70JU-T is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-70JU-T 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-70JU-T meets industry standards.
7.What is the process for return or replacement of AT49BV040A-70JU-T?
All AT49BV040A-70JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-70JU-T, 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-70JU-T part is unused and in its original packaging.
Return procedure for AT49BV040A-70JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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