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Microchip Technology AT49BV040-90TI
- Part No.:
- AT49BV040-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV040-90TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,397
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Product details
Overview
AT49BV040-90TI from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating from 2.7V to 3.6V, featuring 70 ns read access time, 10-second chip erase, and 30 µs/byte programming. It integrates a 16 KB boot block with hardware lockout and supports in-system reprogramming without high-voltage inputs - used in embedded controllers for firmware storage and boot code retention.
For engineers reviewing the AT49BV040-90TI datasheet, AT49BV040-90TI pinout, AT49BV040-90TI application, or AT49BV040-90TI equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), TSOP-32 (8 × 14 mm) package compatibility, boot sector protection logic, and software-controlled erase/program command sequences.
Technical Context
The AT49BV040-90TI implements a standard NOR Flash architecture with addressable byte-wide I/O (I/O₀–I/O₇), dual-line control via CE/OE/WE, and internal command register-based operation. It uses six-byte software command sequences for chip erase, byte programming, and boot block lockout - all executed without external clocks or high-voltage signals.
Its boot block (00000H–03FFFH) is physically located at lowest addresses and supports optional permanent write protection via a deterministic six-cycle command sequence. Data polling (I/O₇ complement) and toggle bit (I/O₆ toggling) provide real-time program/erase cycle completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits) - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz bus interfaces in industrial control systems. |
| Supply Voltage | 2.7V to 3.6V - enables direct connection to 3.3V logic rails without level shifting. |
| Chip Erase Time | 10 seconds typical - allows rapid field firmware updates during maintenance windows. |
| Byte Programming Time | 30 µs typical - enables efficient patching of small configuration tables without system downtime. |
| Endurance | 10,000 write/erase cycles - sufficient for infrequent firmware upgrades over 10+ year product lifecycles. |
| Standby Current | 50 µA CMOS - minimizes power draw in battery-backed or energy-constrained applications. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including motor drives and PLC modules. |
Pinout & Package
AT49BV040-90TI is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP), 8 mm × 14 mm footprint (JEDEC MO-142 BA, type 32V), compatible with automated SMT assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; A0 least significant. |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; supports byte-level reads/writes without multiplexing. |
| CE | Chip Enable | Active-low chip select; must be low for any access; enables bus contention avoidance when shared with other devices. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high - critical for multi-device data bus sharing. |
| WE | Write Enable | Active-low write strobe; latches data on rising edge; controls program/erase command execution timing. |
| VCC | Power Supply | 2.7V–3.6V supply input; includes VCC sense circuitry that inhibits programming if voltage drops below 1.8V. |
| GND | Ground | Reference return path for all signals and power; decoupling required within 10 mm of VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7V–3.6V Supply Operation | Eliminates need for dedicated 5V or 12V programming voltages - simplifies power architecture and reduces BOM count. |
| 16 KB Boot Block with Lockout | Hardware-enforced write protection for secure boot code (00000H–03FFFH); prevents accidental corruption during field firmware updates. |
| Data Polling & Toggle Bit Detection | Real-time program/erase status feedback via I/O₇ complement or I/O₆ toggling - removes need for fixed delay timers in host firmware. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibit logic prevent spurious writes during power transients or EMI events. |
| Software Command Architecture | Six-byte command sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) enable full device control using only standard memory interface signals. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic programs and configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed boot code integrity via hardware-locked 16 KB boot sector. Use Value: Enables safe in-field firmware upgrades while preserving bootloader functionality - critical for maintaining operational continuity during scheduled maintenance. | Use Scenario: Holding certified boot firmware and calibration data in portable diagnostic equipment requiring regulatory compliance and data immutability. IC Role / Device Role / Timing Role: Secure, tamper-resistant code storage with industrial temperature rating and low standby current for battery-backed operation. Use Value: Meets IEC 62304 safety requirements by preventing unauthorized modification of boot code through hardware-enforced lockout. |
| Automotive Body Control Module | Network Router Configuration Storage |
Use Scenario: Storing vehicle-specific configuration maps and diagnostic routines in body control units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: High-reliability Flash memory with −40°C to +85°C qualification and 10,000-cycle endurance for infrequent but mission-critical updates. Use Value: Ensures firmware persistence across automotive lifecycle requirements without requiring external voltage supervisors or backup capacitors. | Use Scenario: Retaining routing tables, security certificates, and vendor-specific configuration profiles in enterprise-grade network infrastructure equipment. IC Role / Device Role / Timing Role: Byte-addressable nonvolatile storage interfaced directly to MIPS or ARM host processors via parallel bus. Use Value: Supports fast, selective updates of individual configuration fields using 30 µs/byte programming - reducing reboot time after 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, 3.0V–3.6V, 90 ns access, same TSOP-32 package but lacks boot block lockout feature. | Requires external software management for boot sector protection; no hardware-enforced write lock. | Select when boot block security is handled at firmware level and cost sensitivity outweighs hardware lockout benefit. |
| MX29LV400CTTI-90G | 4 Mbit, 3.0V–3.6V, 90 ns access, top-boot configuration (boot block at highest addresses), different command set. | Boot block location inverted (7FF00H–7FFFFH); incompatible with AT49BV040-90TI's bottom-boot layout and lockout algorithm. | Select only if board layout and firmware can accommodate top-boot addressing and revised command sequencing. |
Compared with SST39VF400A-90-4C-NHE and MX29LV400CTTI-90G, the AT49BV040-90TI provides unique hardware-enforced bottom-boot lockout and deterministic six-byte command execution - making it preferred for safety-critical or legacy-compatible designs where boot sector integrity is non-negotiable.
Availability
AT49BV040-90TI is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and network infrastructure requiring stable component supply across extended product lifecycles.
Supply support for AT49BV040-90TI 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 semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial and embedded markets.
The AT49BV/LV040 product line was designed for reliable, low-voltage firmware storage in resource-constrained embedded systems - emphasizing in-system reprogrammability, hardware data protection, and industrial temperature resilience.
FAQ
What is the operating temperature range for the AT49BV040-90TI?
The AT49BV040-90TI is rated for industrial operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table (page 11) and applies specifically to the "TI" suffix variant. The device maintains full read/write functionality and timing compliance across this range, with standby current remaining below 50 µA at maximum temperature.
Does the AT49BV040-90TI support hardware write protection for the boot sector?
Yes, the AT49BV040-90TI includes a hardware-enforced boot block lockout feature for the 16 KB region (00000H–03FFFH). Once enabled via the documented six-cycle command sequence (5555h/AAh → 2AAAh/55h → 5555h/40h), programming and erasure of this sector are permanently disabled. The AT49BV040-90TI datasheet confirms this behavior is implemented in silicon, not firmware.
What package type does the AT49BV040-90TI use?
The AT49BV040-90TI uses a 32-lead Plastic Thin Small Outline Package (TSOP) with 8 mm × 14 mm dimensions (JEDEC MO-142 BA, type 32V). This is explicitly stated in the Ordering Information table (page 11) and illustrated in the packaging drawings (page 12). It is distinct from the 32T (8 × 20 mm) and 32J (PLCC) variants.
How is end-of-program detection implemented in the AT49BV040-90TI?
The AT49BV040-90TI supports two hardware methods: Data Polling (I/O₇ returns complement of written data until completion, then true data) and Toggle Bit (I/O₆ toggles between 0 and 1 during programming, then stabilizes). Both are defined in the AC Characteristics section (pages 8–9) and require no external timing components - enabling deterministic host firmware synchronization.
What is the maximum chip erase time for the AT49BV040-90TI?
The maximum chip erase time for the AT49BV040-90TI is 10 seconds, as specified in the "Program Cycle Characteristics" table (page 8) under parameter tEC. This value is guaranteed across the full industrial temperature range and applies to full-array erasure using the six-byte software command sequence.
AT49BV040-90TI 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
AT49BV040-90TI FAQ
1.How can I place an order for AT49BV040-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040-90TI 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 AT49BV040-90TI reliable?
The price and inventory of AT49BV040-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040-90TI is usually 5 days.
3.What payment methods are accepted for AT49BV040-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040-90TI?
AT49BV040-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040-90TI 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 AT49BV040-90TI?
For technical support, including AT49BV040-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040-90TI requirements.
6.How does Aetrix verify that AT49BV040-90TI is sourced from the original manufacturer or authorized distributors?
All AT49BV040-90TI 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 AT49BV040-90TI meets industry standards.
7.What is the process for return or replacement of AT49BV040-90TI?
All AT49BV040-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040-90TI, 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 AT49BV040-90TI part is unused and in its original packaging.
Return procedure for AT49BV040-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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