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Microchip Technology AT49BV040A-90VU-T
- Part No.:
- AT49BV040A-90VU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040A-90VU-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
AT49BV040A-90VU-T 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, and sector-erasable architecture including one 16 KB boot block with programmable lockout-used for secure firmware storage in embedded microcontroller systems.
For engineers reviewing the AT49BV040A-90VU-T datasheet, AT49BV040A-90VU-T pinout, AT49BV040A-90VU-T application, or AT49BV040A-90VU-T equivalent, key selection considerations include its 32-pin VSOP package, 10,000 write/erase cycles, hardware data protection (VCC sense, noise filtering), DATA polling/toggle bit end-of-program detection, and boot-sector write lockout for bootloader integrity.
Technical Context
The AT49BV040A-90VU-T implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read operation and command-based byte programming and sector erasure. Its internal program controller handles timing for erase (7 s typical) and byte-write (30 µs typical) without external clocks.
It features a hierarchical sector architecture: one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB). 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), sufficient for compact firmware images and configuration data in resource-constrained systems |
| Read Access Time | 90 ns max - defines minimum bus cycle timing for reliable CPU or FPGA read operations |
| Byte Programming Time | 30 µs typical - enables fast field updates without long blocking delays during firmware patching |
| Sector Erase Time | 7 seconds typical - allows selective reprogramming of parameter or application blocks while preserving boot code |
| Write End Detection | DATA polling (I/O7 complement) and toggle bit (I/O6) - eliminates need for fixed timeout waits in host firmware |
| Power Supply | 2.7–3.6 V single supply - compatible with 3.3 V logic domains and battery-backed operation |
| Endurance | 10,000 program/erase cycles - supports long-term field upgrades in industrial controllers and networking equipment |
| Standby Current | 50 µA CMOS - enables ultra-low-power retention in always-on embedded systems |
Pinout & Package
AT49BV040A-90VU-T is packaged in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm, compliant with JEDEC MO-142 BA. Pin 1 identifier located at top-left corner when viewed from top with marking side up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; A11–A18 are don't-care in command cycles |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification modes; I/O6 = toggle bit, I/O7 = DATA polling indicator |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; used with WE to latch commands |
| OE | Output Enable | Active-low output control; high during programming/erasure to prevent bus contention |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data in command sequences |
| VCC | Power Supply | +2.7 V to +3.6 V supply; device inhibits programming if VCC < 1.8 V (hardware protection) |
| GND | Ground | Reference for all signals and power; required for stable operation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16 KB (00000H–03FFFH) permanently protected after command activation - ensures bootloader integrity against accidental overwrite |
| Hardware Data Protection | VCC sense, WE/CE/OE inhibit logic, and 15 ns noise filter - prevents spurious writes during power transients or EMI events |
| Software Command Architecture | 6-byte chip erase, 6-cycle sector erase, 4-cycle byte program - eliminates need for external high-voltage generators or dedicated programmers |
| End-of-Operation Detection | DATA polling (I/O7) and toggle bit (I/O6) - enables deterministic host firmware flow without fixed delays or external timers |
| Green Packaging | Pb/Halide-free VSOP (32V) - meets RoHS compliance requirements for commercial and industrial PCB assembly |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing and updating firmware for programmable logic controllers in factory automation systems requiring field-upgradable logic and configuration data. IC Role / Device Role / Timing Role: Nonvolatile program memory holding ladder logic, I/O mapping, and safety routines; accessed via parallel bus during boot and runtime updates. Use Value: Sector-erasable architecture allows parameter block updates without disturbing boot code; 10,000-cycle endurance supports multi-year maintenance cycles. | Use Scenario: Holding calibrated sensor tables, actuator control algorithms, and diagnostic firmware in automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Primary flash memory for MCU boot image and runtime configuration; interfaces directly to 3.3 V microcontroller address/data bus. Use Value: 2.7–3.6 V single-supply operation matches automotive 3.3 V rail; 50 µA standby current minimizes battery drain during vehicle sleep mode. |
| Medical Device Configuration Memory | Networking Equipment Parameter Storage |
Use Scenario: Storing user-configurable calibration offsets, safety thresholds, and device identity in Class II medical instruments with regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure nonvolatile storage for critical setup data; boot block lockout prevents corruption of FDA-mandated startup routines. Use Value: Hardware write protection and DATA polling ensure deterministic, auditable firmware update behavior compliant with IEC 62304. | Use Scenario: Retaining MAC address tables, VLAN settings, and firmware patches in managed Ethernet switches and routers deployed in enterprise infrastructure. IC Role / Device Role / Timing Role: Parallel-connected configuration memory for network processor or ARM-based SoC; updated via JTAG or host CPU during maintenance windows. Use Value: Fast 30 µs/byte programming enables rapid provisioning of multiple units; sector erase isolates config changes from core firmware. |
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-EKE | 4 Mbit, 90 ns, 3.3 V, 48-pin TSOP; lacks boot block lockout; uses different command set | No hardware-protected boot sector; requires external software management of bootloader integrity | Choose when board layout accommodates 48-pin footprint and bootloader security is handled in firmware |
| MX29LV400CTTI-90G | 4 Mbit, 90 ns, 3.0–3.6 V, 48-pin TSOP; includes CFI-compliant boot block but no lockout command | Boot block exists but lacks permanent write-protection feature; relies on software-enforced access control | Prefer for CFI-compliant systems needing standardized flash interrogation, where lockout is not mandatory |
Compared with SST39VF400A-90-4C-EKE and MX29LV400CTTI-90G, the AT49BV040A-90VU-T uniquely delivers hardware-enforced boot block lockout in a 32-pin VSOP package-reducing PCB area and eliminating firmware-level security overhead for bootloader protection.
Availability
AT49BV040A-90VU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, and medical device configuration memory requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49BV040A-90VU-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
Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded systems.
The AT49BV040A product line was designed for cost-sensitive, space-constrained embedded applications requiring in-system reprogrammability, hardware write protection, and robust operation from -40°C to +85°C.
FAQ
What is the package type and pin count of the AT49BV040A-90VU-T?
The AT49BV040A-90VU-T uses a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm, with standard parallel Flash pinout including A0–A18, I/O0–I/O7, CE, OE, WE, VCC, and GND. This matches JEDEC MO-142 BA and provides compact footprint for high-density PCB layouts.
Does the AT49BV040A-90VU-T support hardware write protection for the boot sector?
Yes, the AT49BV040A-90VU-T includes a hardware-programmable boot block lockout feature for its 16 KB boot sector (00000H–03FFFH). Once enabled via a six-cycle command sequence, the boot block becomes permanently read-only - preventing accidental or malicious reprogramming of bootloader code.
How does the AT49BV040A-90VU-T indicate completion of a byte programming cycle?
The AT49BV040A-90VU-T supports two hardware methods: DATA polling (I/O7 returns complement of written data until complete, then true data) and toggle bit (I/O6 toggles between 0 and 1 during programming, stops when complete). Both allow host firmware to detect completion without fixed timeouts.
What is the maximum erase time for a full chip erase on the AT49BV040A-90VU-T?
The AT49BV040A-90VU-T specifies a maximum chip erase time (tEC) of 12 seconds. Typical chip erase completes in 7 seconds. If boot block lockout is enabled, only parameter blocks and main memory blocks are erased; the boot block remains intact.
Is the AT49BV040A-90VU-T RoHS compliant?
Yes, the AT49BV040A-90VU-T is manufactured with green (Pb/Halide-free) packaging per the ordering code suffix "U", confirming full RoHS compliance for lead-free soldering processes and environmental regulatory requirements.
AT49BV040A-90VU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- 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:
- 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-90VU-T FAQ
1.How can I place an order for AT49BV040A-90VU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-90VU-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-90VU-T reliable?
The price and inventory of AT49BV040A-90VU-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-90VU-T is usually 5 days.
3.What payment methods are accepted for AT49BV040A-90VU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-90VU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-90VU-T?
AT49BV040A-90VU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-90VU-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-90VU-T?
For technical support, including AT49BV040A-90VU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-90VU-T requirements.
6.How does Aetrix verify that AT49BV040A-90VU-T is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-90VU-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-90VU-T meets industry standards.
7.What is the process for return or replacement of AT49BV040A-90VU-T?
All AT49BV040A-90VU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-90VU-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-90VU-T part is unused and in its original packaging.
Return procedure for AT49BV040A-90VU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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