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Microchip Technology AT49BV040A-90TU
- Part No.:
- AT49BV040A-90TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV040A-90TU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
AT49BV040A-90TU from Microchip Technology (formerly 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-90TU datasheet, AT49BV040A-90TU pinout, AT49BV040A-90TU application, or AT49BV040A-90TU equivalent, this page provides verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in the official Atmel 3358C–FLASH–3/05 datasheet and Microchip product documentation.
Technical Context
The AT49BV040A-90TU implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read timing and software command-based byte programming and sector erasure. Its architecture includes one 16 KB boot block with programmable lockout, two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB), all accessible via A0–A18 address lines and I/O0–I/O7 bidirectional data bus.
It uses internal program control and timers to eliminate external high-voltage programming requirements, relying solely on 2.7–3.6 V VCC. End-of-program detection is supported via DATA polling (I/O7 complement behavior) and Toggle Bit (I/O6 toggling), both usable at any point during programming or erase cycles without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits) - supports full firmware images for 8-bit MCUs with space for configuration and parameter storage. |
| Read Access Time | 90 ns max - ensures compatibility with 10 MHz bus timing in legacy microcontroller designs without wait states. |
| Byte Programming Time | 30 µs typical - enables rapid field updates of small code patches or calibration data without system downtime. |
| Sector Erase Time | 7 seconds max - allows predictable in-system reprogramming windows for parameter or application code sections. |
| Write Endurance | 10,000 program/erase cycles - qualifies for industrial applications requiring periodic firmware upgrades over 5+ years. |
| Supply Voltage | 2.7–3.6 V single supply - eliminates need for charge pumps or dual-rail power, simplifying battery-powered or low-voltage embedded designs. |
| Standby Current | 50 µA CMOS - enables ultra-low-power retention in always-on monitoring systems with infrequent firmware access. |
Pinout & Package
AT49BV040A-90TU is packaged in a 32-lead Thin Small Outline Package (TSOP, Type 1, 8 × 20 mm), compliant with JEDEC MO-142 BD. Pin 1 is marked by a notch or dot; package is Pb/halide-free (Green option).
| 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 in command sequences. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; inhibits programming when high. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, preventing bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase commands; inhibits writes when high. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for reads, byte programming, and command loading; supports DATA polling (I/O7) and Toggle Bit (I/O6). |
| VCC | Power Supply | 2.7–3.6 V core supply; internal voltage sensing disables programming if VCC drops below ~1.8 V. |
| GND | Ground | Reference for all input thresholds and output levels; decoupling near VCC/GND pins required for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB (00000H–03FFFH) can be permanently write-protected via 6-cycle command sequence - secures bootloader integrity against accidental overwrite. |
| Hardware Data Protection | VCC sense, noise filtering (15 ns pulse rejection), and triple-line inhibit (OE low / CE high / WE high) prevent spurious writes in noisy environments. |
| DATA Polling & Toggle Bit | Real-time end-of-program detection without polling overhead: I/O7 returns complement until completion; I/O6 toggles until operation finishes. |
| Sector-Erasable Architecture | Independent erasure of boot block, two 8 KB parameter blocks, and eight main memory blocks - enables selective firmware updates without full chip erase. |
| Green Packaging | Pb/halide-free TSOP (32T) - meets RoHS Directive 2011/65/EU and supports environmentally compliant industrial manufacturing. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
|
Use Scenario: Storing and updating firmware for programmable logic controllers operating in factory automation environments with temperature cycling and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing fast 90 ns read access for deterministic scan-cycle execution and secure 16 KB boot block for trusted startup routines. Use Value: Enables field-upgradable ladder logic and safety-critical firmware while maintaining data integrity via hardware lockout and 10,000-cycle endurance. |
Use Scenario: Holding certified bootloader and calibration data in portable diagnostic equipment requiring regulatory-compliant, long-life memory with traceable write cycles. IC Role / Device Role / Timing Role: Secure boot memory IC with programmable lockout protecting FDA-approved startup code, accessed via standard microcontroller parallel bus. Use Value: Guarantees bootloader immutability after certification; supports audit-ready firmware revision tracking using parameter block sectors. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration |
|
Use Scenario: Storing vehicle-specific configuration tables and minor firmware patches in body control units where reprogramming occurs during service visits. IC Role / Device Role / Timing Role: In-system reprogrammable Flash IC supporting 2.7–3.6 V operation across automotive battery voltage range and 7-second sector erase for quick module recalibration. Use Value: Eliminates need for external programming hardware; reduces service time via targeted sector updates instead of full flash replacement. |
Use Scenario: Retaining localized language packs, tax rule sets, and peripheral driver configurations in retail terminals deployed globally with regional compliance requirements. IC Role / Device Role / Timing Role: Parameter storage IC using two dedicated 8 KB blocks for versioned configuration data, isolated from main application code in 64 KB sectors. Use Value: Allows zero-downtime regional updates via sector erase; prevents corruption of active application code during configuration changes. |
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 only (no 2.7 V support); lacks boot block lockout; uses different command set. | Requires higher minimum VCC; no hardware-secured boot region - unsuitable for bootloader-critical designs. | Select only if 2.7 V operation is unnecessary and boot security is managed externally. |
| MX29LV400CTTI-90G | 4 Mbit, 90 ns, 2.7–3.6 V; includes CFI-compliant command set and 16 KB boot sector with write protection, but uses different address mapping (top/bottom configurable). | CFI interface enables auto-configuration in BIOS/bootloader; top/bottom boot sector flexibility adds design complexity vs fixed AT49BV040A layout. | Prefer for new designs needing CFI compatibility or flexible boot sector orientation; verify address decoding matches. |
Compared with SST39VF400A-90-4C-NHE and MX29LV400CTTI-90G, the AT49BV040A-90TU uniquely guarantees 2.7 V operation and offers a fixed, documented boot block address range (00000H–03FFFH) with deterministic lockout activation - critical for legacy MCU platforms lacking CFI support or voltage margin.
Availability
AT49BV040A-90TU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive body control module configuration requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT49BV040A-90TU 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. The company specializes in microcontrollers, analog, Flash memory, and security ICs for industrial, automotive, and consumer markets.
The AT49BV040A-90TU belongs to Atmel's legacy parallel Flash memory product line, designed specifically for cost-sensitive, in-system reprogrammable code storage in 8-bit and 16-bit microcontroller systems with strict voltage and timing constraints.
FAQ
What is the operating voltage range for the AT49BV040A-90TU?
The AT49BV040A-90TU operates from 2.7 V to 3.6 V DC on a single supply. It includes internal VCC sensing that inhibits programming if voltage drops below approximately 1.8 V, ensuring data integrity during brown-out conditions. This range supports direct connection to 3.3 V logic systems and battery-backed industrial controllers without level-shifting.
Does the AT49BV040A-90TU support hardware write protection for the boot sector?
Yes, the AT49BV040A-90TU features a dedicated 16 KB boot block (00000H–03FFFH) with programmable hardware lockout. Once enabled via a six-cycle command sequence (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H), the boot sector becomes permanently read-only - preventing accidental or malicious reprogramming of critical startup code in the AT49BV040A-90TU.
How is end-of-program detection implemented in the AT49BV040A-90TU?
The AT49BV040A-90TU supports two independent end-of-program detection methods: DATA polling (monitoring I/O7 for complement-to-data transition) and Toggle Bit (observing I/O6 toggling state). Both operate asynchronously and can be polled at any time during programming - eliminating reliance on fixed timing delays and enabling deterministic firmware update loops in the AT49BV040A-90TU.
What package type is used for the AT49BV040A-90TU?
The AT49BV040A-90TU is supplied in a 32-lead Thin Small Outline Package (TSOP, Type 1), measuring 8 mm × 20 mm, per JEDEC MO-142 BD. It is Pb/halide-free (Green) and marked "TU" in the ordering code - distinguishing it from PLCC (JI) and VSOP (VU) variants of the same device.
Is the AT49BV040A-90TU still recommended for new designs?
No - the AT49BV040A-90TU is marked "Not Recommended for New Design" in the original Atmel datasheet (3358C–FLASH–3/05). While fully supported for existing production and legacy repair, Microchip recommends evaluating newer serial NOR Flash alternatives (e.g., SST26VF032B) for new projects requiring extended longevity, lower pin count, or QSPI interface compatibility - though the AT49BV040A-90TU remains viable where parallel interface and proven reliability are mandatory.
AT49BV040A-90TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm 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-TSOP
AT49BV040A-90TU FAQ
1.How can I place an order for AT49BV040A-90TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-90TU 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-90TU reliable?
The price and inventory of AT49BV040A-90TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-90TU is usually 5 days.
3.What payment methods are accepted for AT49BV040A-90TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-90TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-90TU?
AT49BV040A-90TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-90TU 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-90TU?
For technical support, including AT49BV040A-90TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-90TU requirements.
6.How does Aetrix verify that AT49BV040A-90TU is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-90TU 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-90TU meets industry standards.
7.What is the process for return or replacement of AT49BV040A-90TU?
All AT49BV040A-90TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-90TU, 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-90TU part is unused and in its original packaging.
Return procedure for AT49BV040A-90TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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