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Microchip Technology AT49BV040A-90VU
- Part No.:
- AT49BV040A-90VU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040A-90VU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,073
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Product details
Overview
AT49BV040A-90VU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) single-supply, in-system reprogrammable Flash memory IC operating at 2.7–3.6 V. It delivers 90 ns read access time, 30 µs/byte programming, and sector-erase architecture with one 16 KB boot block, two 8 KB parameter blocks, and eight main memory blocks - used for firmware storage and secure boot code retention in embedded controllers.
For engineers reviewing the AT49BV040A-90VU datasheet, AT49BV040A-90VU pinout, AT49BV040A-90VU application, or AT49BV040A-90VU equivalent, this page provides verified technical context, validated pin functions, confirmed sector protection behavior, real-world timing constraints (tACC = 90 ns, tBP = 30 µs), and direct alternatives for industrial firmware storage upgrades.
Technical Context
The AT49BV040A-90VU implements a standard parallel NOR Flash interface with CE/OE/WE control logic and 19-bit address bus (A0–A18), supporting EPROM-like read operation and command-based byte programming and sector erasure. Its internal program controller handles timing without external clocks, and DATA polling (I/O7 complement) or toggle-bit (I/O6) detection signals completion of write/erase cycles.
It features hardware data protection via VCC sense (<1.8 V inhibits programming), noise filtering on WE/CE inputs (<15 ns pulses ignored), and programmable boot block lockout - a six-cycle command sequence permanently disables erase/program access to the 00000H–03FFFH region, preserving secure boot code while allowing updates to remaining sectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), organized as 524,288 words × 8 bits - sufficient for full microcontroller firmware images in space-constrained industrial controllers. |
| Read Access Time | 90 ns max (tACC) - defines minimum bus cycle time for CPU read operations; compatible with 11 MHz system clocks. |
| Byte Programming Time | 30 µs typical (tBP) - determines worst-case latency for field firmware patching; enables fast in-system updates without full chip erase. |
| Sector Erase Time | 7 seconds max per sector - allows selective reprogramming of parameter blocks or application code segments without disrupting boot integrity. |
| Supply Voltage Range | 2.7 V to 3.6 V - supports direct connection to 3.3 V logic rails and battery-backed operation down to 2.7 V. |
| Standby Current | 50 µA CMOS (ISB1) - enables ultra-low-power retention during sleep modes in portable or energy-harvested devices. |
| Endurance | 10,000 program/erase cycles - qualifies for long-life firmware update cycles in industrial gateways and PLCs. |
| Operating Temperature | −40°C to +85°C - rated for extended industrial environments without derating. |
Pinout & Package
AT49BV040A-90VU is packaged in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body size, JEDEC MO-142 BA compliant, with gull-wing leads and pin 1 identifier marked. Pin pitch is 0.50 mm; lead coplanarity ≤ 0.10 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus selecting one of 524,288 bytes; A11 is don't-care in command cycles per datasheet note. |
| CE | Chip Enable | Active-low enable for device selection; must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output gate; controls data bus drive; high-Z when asserted high during standby or write inhibit. |
| WE | Write Enable | Active-low control for write/erase command latching; rising edge latches data in command sequences (e.g., Sector Erase sixth cycle). |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries command codes, addresses, and data; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring. |
| VCC | Power Supply | 2.7–3.6 V primary supply; internal voltage regulation enables single-supply operation without external charge pumps. |
| GND | Ground Reference | Signal and power return; decoupling capacitor required within 10 mm of VCC pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | Hardware-enforced permanent write protection for 16 KB (00000H–03FFFH) after six-command activation - ensures bootloader integrity across firmware updates. |
| Data Polling (I/O7) | Real-time program completion detection by reading last programmed byte: complemented value indicates ongoing write; true value confirms readiness for next access. |
| Toggle Bit (I/O6) | Asynchronous status indicator: toggling between 0/1 during erase/program; stops when operation completes - usable without address management overhead. |
| Hardware Program Inhibit | Automatic disable of programming if VCC < 1.8 V, OE low, CE high, or WE high - prevents accidental writes during power-up/down or noise events. |
| Green Packaging | Pb/Halide-free VSOP package (32V) - complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3. |
Applications
| Industrial PLC Firmware Storage | Secure Bootloader Retention |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct CPU bus access for fast firmware load at power-on; 90 ns tACC aligns with 11 MHz bus timing. Use Value: Sector architecture enables independent update of application code (main blocks) while preserving boot loader (locked boot block), minimizing downtime during field upgrades. | Use Scenario: Hosting immutable bootloader code in medical infusion pumps requiring FDA-compliant firmware validation and tamper resistance. IC Role / Device Role / Timing Role: Secure boot memory with hardware lockout preventing unauthorized modification of startup routines; operates at 3.3 V with 50 µA standby current. Use Value: Permanent boot block protection ensures bootloader remains unaltered across 10,000+ field updates, meeting IEC 62304 software lifecycle requirements. |
| Parameter Configuration Storage | Legacy System BIOS Replacement |
Use Scenario: Holding calibration constants and sensor compensation tables in test equipment where recalibration occurs infrequently but requires guaranteed data retention. IC Role / Device Role / Timing Role: Parameter block (two 8 KB sections) dedicated to nonvolatile configuration storage; accessed via standard CE/OE/WE protocol. Use Value: Independent sector erase allows updating calibration data without disturbing main firmware, reducing risk of system corruption during maintenance. | Use Scenario: Replacing obsolete EPROM-based BIOS in legacy industrial HMIs where socket compatibility and read timing are critical. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical 32-pin VSOP footprint and 90 ns read access - no PCB redesign needed. Use Value: Eliminates UV-erasable EPROM handling and programming infrastructure while maintaining full backward compatibility with existing BIOS read routines. |
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 access, same 32-pin TSOP/VSOP package; supports CFI query mode and faster 18 µs byte program time. | CFI support simplifies auto-detection in generic flash programmers; lacks dedicated boot block lockout feature. | Select when firmware update flexibility outweighs need for hardware-enforced bootloader protection. |
| MX29LV400CTTI-90G | 4 Mbit, 90 ns, 32-pin TSOP; includes BOOT/ADDR bit for configurable top/bottom boot block and 12 V VPP requirement for programming. | Requires external 12 V supply for programming; boot block size and location configurable via ADDR pin, not fixed at 00000H–03FFFH. | Choose only if existing design already uses 12 V programming infrastructure and flexible boot sector sizing is preferred. |
Compared with SST39VF400A-90-4C-EKE and MX29LV400CTTI-90G, the AT49BV040A-90VU offers unique hardware-enforced boot block lockout without external voltage, making it optimal for safety-critical boot integrity - whereas alternatives trade that for CFI compatibility or configurable boot regions at the cost of added voltage complexity or reduced protection assurance.
Availability
AT49BV040A-90VU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, secure bootloader retention, parameter configuration storage, and legacy BIOS replacement requiring stable component supply and long-term obsolescence management.
Supply support for AT49BV040A-90VU 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 full support for legacy Atmel Flash products including the AT49BV040A series.
The AT49BV040A belongs to Atmel's battery-voltage Flash memory product line, designed specifically for in-system reprogrammability in resource-constrained industrial and embedded systems using only a single 3.3 V supply.
FAQ
What is the maximum operating temperature range for the AT49BV040A-90VU?
The AT49BV040A-90VU is rated for industrial operation from −40°C to +85°C. This range is fully specified in the DC and AC operating conditions section of the datasheet, with all timing parameters (including tACC = 90 ns and tBP = 30 µs) guaranteed across this temperature span. No derating is required within these limits, making the AT49BV040A-90VU suitable for deployment in harsh factory-floor or outdoor control cabinet environments.
Does the AT49BV040A-90VU require a high-voltage programming supply?
No, the AT49BV040A-90VU does not require a high-voltage programming supply. It is a single 2.7–3.6 V device: all read, program, and erase operations execute using only the VCC supply. Programming is initiated via standard 3.3 V command sequences (e.g., 555H/AAH, AAH/55H), and internal circuitry generates necessary pump voltages. This eliminates the need for external 12 V sources or charge-pump circuits, simplifying board design and improving reliability compared to older Flash devices.
How is boot block protection enabled on the AT49BV040A-90VU?
Boot block protection on the AT49BV040A-90VU 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 - with a 1-second pause before the final command. Once activated, the 16 KB boot block (00000H–03FFFH) becomes permanently read-only; no subsequent command can disable or override this lock. The AT49BV040A-90VU datasheet confirms this irreversible behavior in Section 4.5.
Can the AT49BV040A-90VU be used as a direct replacement for EPROMs like the 27C040?
Yes, the AT49BV040A-90VU can serve as a functional drop-in replacement for 27C040 EPROMs in many designs due to identical 512K × 8 organization, 32-pin VSOP/TSOP packaging, and EPROM-compatible read protocol (CE/OE/WE control). However, unlike UV-erasable EPROMs, the AT49BV040A-90VU requires electrical sector erasure and supports in-system programming - meaning existing EPROM sockets and address/data buses may be reused, but programming infrastructure must be updated to support Flash command sequences.
What methods does the AT49BV040A-90VU provide to detect program/erase completion?
The AT49BV040A-90VU provides two hardware-supported methods: DATA polling (monitoring I/O7 - complemented value during write, true value on completion) and Toggle Bit (monitoring I/O6 - toggles asynchronously during operation, stabilizes when complete). Both methods are usable at any point during the cycle and require no additional timing margins. These mechanisms eliminate the need for fixed delay loops or external status lines, enabling deterministic firmware update routines in real-time embedded applications using the AT49BV040A-90VU.
AT49BV040A-90VU 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-90VU FAQ
1.How can I place an order for AT49BV040A-90VU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-90VU 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 reliable?
The price and inventory of AT49BV040A-90VU 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 is usually 5 days.
3.What payment methods are accepted for AT49BV040A-90VU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-90VU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-90VU?
AT49BV040A-90VU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-90VU 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?
For technical support, including AT49BV040A-90VU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-90VU requirements.
6.How does Aetrix verify that AT49BV040A-90VU is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-90VU 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 meets industry standards.
7.What is the process for return or replacement of AT49BV040A-90VU?
All AT49BV040A-90VU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-90VU, 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 part is unused and in its original packaging.
Return procedure for AT49BV040A-90VU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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