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Microchip Technology AT49BV040B-VU
- Part No.:
- AT49BV040B-VU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040B-VU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
AT49BV040B-VU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) in-system reprogrammable Flash memory IC designed for embedded firmware storage and boot code retention. It operates from a single 2.7V–3.6V or 4.5V–5.5V supply, delivers 70 ns read access at 2.7–3.6V and 55 ns at 4.5–5.5V, supports byte-by-byte programming (10 µs/byte), and features hardware data protection and boot sector lockout. It is used in industrial controllers, network edge devices, and legacy microcontroller-based systems requiring field-upgradable nonvolatile storage.
For engineers reviewing the AT49BV040B-VU datasheet, AT49BV040B-VU pinout, AT49BV040B-VU application, or AT49BV040B-VU equivalent, key selection considerations include its flexible sector architecture (1×16KB boot + 2×8KB parameter + 8×main sectors), CMOS standby current (25 µA @ 2.7–3.6V), 100,000 write cycles endurance, and compatibility with standard EPROM-like CE/OE/WE control interface.
Technical Context
The AT49BV040B-VU implements a command-register-based architecture for sector erase and byte programming, eliminating need for external high-voltage programming supplies. Its internal program timer and control logic execute chip/sector erase (8 s chip, 900 ms sector) and verify operations autonomously using DATA polling (I/O7 complement) or toggle bit (I/O6 toggling) status detection.
It features dual-voltage operation with distinct AC timing bins: 70 ns access at 2.7–3.6V and 55 ns at 4.5–5.5V, while maintaining consistent DC parameters including 20 mA active current and hardware VCC-sense protection below 1.8V. The boot sector (00000H–03FFFH) supports optional permanent lockout via six-cycle command sequence to preserve secure startup code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for medium-complexity firmware images and configuration tables |
| Read Access Time | 70 ns @ 2.7–3.6V; 55 ns @ 4.5–5.5V - enables direct replacement of faster EPROMs in legacy 8-bit bus systems |
| Byte Programming Time | 10 µs typical - allows rapid field updates without system downtime |
| Erase Cycle Time | 8 seconds (chip), 900 ms (sector) - balances speed and reliability for partial reprogramming |
| Endurance | ≥100,000 program/erase cycles - supports long-term deployment in infrequently updated applications |
| Standby Current | 25 µA @ 2.7–3.6V; 30 µA @ 4.5–5.5V - meets low-power requirements for always-on industrial nodes |
| Operating Temperature | −40°C to +85°C (industrial grade) - validated for use in uncontrolled ambient environments |
Pinout & Package
AT49BV040B-VU is packaged in a 32-lead Very Small Outline Package (VSOP), measuring 14 mm × 8 mm with 0.5 mm lead pitch, compliant with JEDEC MO-142 Variation BA. This thin, surface-mount package supports high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A0 used for command entry |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers; carries command data, product ID, and user data |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; initiates command latching on falling edge |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high; used with CE for bus contention avoidance |
| WE | Write Enable | Active-low write strobe; controls command/data latching and initiates programming/erase cycles on rising edge |
| VCC | Power Supply | Single 2.7–3.6V or 4.5–5.5V supply; includes internal VCC-sense circuitry to inhibit programming if voltage drops below ~1.8V |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Sector Architecture | 1×16KB boot sector (00000H–03FFFH) + 2×8KB parameter sectors + 8×main sectors (32KB/64KB) enables granular firmware updates without full chip erase |
| Boot Sector Lockout | Software-enabled permanent write protection for boot code region prevents accidental corruption during field upgrades |
| Hardware Data Protection | VCC-sense, noise filtering (<15 ns pulse rejection), and control-line inhibition (OE low/CE high/WE high) prevent spurious programming |
| Status Detection Methods | Dual independent mechanisms - DATA polling (I/O7 complement) and toggle bit (I/O6 toggling) - allow robust end-of-operation detection in interrupt-driven or polling-based firmware |
| EPROM-Compatible Interface | Standard CE/OE/WE control signals and timing eliminate need for protocol translation logic in legacy 8-bit designs |
Applications
| Industrial PLC Firmware Storage | Legacy Network Router Boot Code |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and application firmware; accessed during cold start and field upgrade via JTAG or serial interface. Use Value: Boot sector lockout ensures bootloader integrity across 100,000+ field updates; 85°C rating guarantees reliable operation inside enclosed control cabinets. | Use Scenario: Holding boot ROM and configuration data in discontinued enterprise routers where replacement parts must match original timing and pinout. IC Role / Device Role / Timing Role: Drop-in EPROM replacement providing identical 55 ns read timing at 5V and CE/OE/WE control interface for aging MIPS-based CPU buses. Use Value: 70 ns/55 ns dual-voltage timing bin matches legacy design margins; VSOP package fits existing footprint without board rework. |
| Medical Diagnostic Equipment Configuration | Automated Test Equipment (ATE) Calibration Data |
Use Scenario: Retaining device-specific calibration constants and safety-critical startup parameters in portable ultrasound and ECG units subject to regulatory audit. IC Role / Device Role / Timing Role: Secure parameter storage with write-protection; accessed only during power-on self-test and service-mode calibration routines. Use Value: Parameter sectors (04000H–07FFFH) store calibrated coefficients; hardware lockout and 100K-cycle endurance ensure data integrity over 10+ year product lifecycle. | Use Scenario: Storing per-channel timing offsets and sensor compensation tables in rack-mounted ATE platforms requiring recalibration every 6 months. IC Role / Device Role / Timing Role: Field-updatable memory mapped into test controller's address space; erased and rewritten during scheduled maintenance windows. Use Value: Sector-erase capability isolates calibration data updates from main firmware; 900 ms sector erase minimizes test downtime versus full-chip erase. |
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 | 4 Mbit, 70 ns access, 3.0–3.6V only; no 4.5–5.5V support; lacks boot sector lockout | Requires stable 3.3V rail; unsuitable for mixed-voltage or 5V legacy systems needing boot protection | Select when operating exclusively at 3.3V and boot sector security is not required |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns, 3.0–3.6V; boot sector configurable (top/bottom); no 5V mode; different command set | Compatible with 3.3V-only designs; requires firmware adaptation for command sequences and sector mapping | Select for new 3.3V designs where top/bottom boot configuration flexibility outweighs command compatibility |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040B-VU uniquely supports dual-voltage operation (2.7–3.6V and 4.5–5.5V) and offers hardware-enforced boot sector lockout - critical for maintaining bootloader integrity in mixed-voltage industrial upgrades.
Availability
AT49BV040B-VU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy network router boot code, and medical diagnostic equipment configuration requiring stable component supply across extended product lifecycles.
Supply support for AT49BV040B-VU 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 its legacy Flash memory portfolio, emphasizing reliability, longevity, and backward compatibility for industrial and automotive-qualified components.
The AT49BV040B-VU belongs to Atmel's BV-series Flash memory family, engineered specifically for in-system reprogrammability in resource-constrained 8-bit embedded systems requiring field-upgradable firmware and secure boot code retention.
FAQ
What voltage ranges does the AT49BV040B-VU support for reliable read and write operation?
The AT49BV040B-VU supports two distinct operating voltage ranges: 2.7V to 3.6V and 4.5V to 5.5V. Read access time is 70 ns within the lower range and 55 ns within the higher range. Programming and erasure are guaranteed across both ranges, and hardware VCC-sense circuitry disables programming if supply drops below ~1.8V. The AT49BV040B-VU must not be operated between 3.6V and 4.5V.
How is boot sector protection enabled on the AT49BV040B-VU, and is it reversible?
Boot sector lockout on the AT49BV040B-VU is enabled via a six-cycle command sequence (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H), after which the 16KB boot sector (00000H–03FFFH) becomes permanently write-protected. Once activated, the lockout cannot be disabled; the AT49BV040B-VU retains this state through power cycles and requires no additional hardware.
What are the valid sector erase address ranges for the AT49BV040B-VU?
The AT49BV040B-VU defines eight main memory sectors and two parameter sectors with fixed address boundaries: Parameter Sector 1 (04000H–05FFFH), Parameter Sector 2 (06000H–07FFFH), Main Sector 1 (08000H–0FFFFH), Main Sector 2 (10000H–1FFFFH), and so on up to Main Sector 8 (70000H–7FFFFH). Sector erase commands require a valid address within the target sector; the AT49BV040B-VU validates address alignment internally.
Does the AT49BV040B-VU require external high-voltage programming signals?
No, the AT49BV040B-VU performs all programming and erase operations using only its standard VCC supply (2.7–3.6V or 4.5–5.5V) - no external 12V or 5VPP signals are needed. Internal charge pumps generate required programming voltages, enabling true in-system reprogrammability via standard microcontroller GPIOs. This eliminates external HV circuitry and simplifies board design for the AT49BV040B-VU.
How can firmware detect whether the boot sector lockout is active on the AT49BV040B-VU?
Firmware can detect AT49BV040B-VU boot sector lockout status by entering Software Product Identification mode (555H/AAH → AAH/55H → 555H/90H), then reading address 00002H: if I/O0 = low, lockout is inactive; if I/O0 = high, lockout is enabled. After reading, the Product ID Exit command (555H/F0H) must be issued to return the AT49BV040B-VU to normal read mode.
AT49BV040B-VU 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:
- 120µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV040B-VU FAQ
1.How can I place an order for AT49BV040B-VU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040B-VU 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 AT49BV040B-VU reliable?
The price and inventory of AT49BV040B-VU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040B-VU is usually 5 days.
3.What payment methods are accepted for AT49BV040B-VU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040B-VU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040B-VU?
AT49BV040B-VU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040B-VU 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 AT49BV040B-VU?
For technical support, including AT49BV040B-VU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040B-VU requirements.
6.How does Aetrix verify that AT49BV040B-VU is sourced from the original manufacturer or authorized distributors?
All AT49BV040B-VU 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 AT49BV040B-VU meets industry standards.
7.What is the process for return or replacement of AT49BV040B-VU?
All AT49BV040B-VU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040B-VU, 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 AT49BV040B-VU part is unused and in its original packaging.
Return procedure for AT49BV040B-VU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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