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Microchip Technology AT49BV040A-90TI
- Part No.:
- AT49BV040A-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV040A-90TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,722
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Product details
Overview
AT49BV040A-90TI 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-90TI datasheet, AT49BV040A-90TI pinout, AT49BV040A-90TI application, or AT49BV040A-90TI equivalent, this page delivers verified timing specs, boot-block protection behavior, sector erase command sequences, DC/AC operating limits, and real-world design implications for industrial firmware update systems requiring stable 3V-only Flash with hardware data protection.
Technical Context
The AT49BV040A-90TI implements a standard parallel Flash interface with CE/OE/WE control logic, EPROM-compatible read operation, and internal command register-based programming/erasure. Its sector architecture comprises one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB).
It supports DATA polling (I/O7 complement detection) and toggle-bit (I/O6 toggling) methods to monitor program/erase completion without external timing constraints. Hardware protection includes VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and write-inhibit via OE low/CE high/WE high states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits-supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 90 ns max (tACC)-enables direct execution from Flash at ≤11 MHz bus clock in wait-state-free systems. |
| Byte Programming Time | 30 µs typical (tBP)-allows rapid field updates of small configuration or calibration data segments. |
| Chip Erase Time | 12 seconds max (tEC)-defines minimum downtime during full firmware replacement in production or service. |
| Standby Current | 50 µA CMOS (ISB1)-enables ultra-low-power retention in battery-backed embedded controllers. |
| Write End Detection | DATA polling (I/O7) and toggle-bit (I/O6)-eliminates need for fixed delay timers in host firmware drivers. |
| Boot Block Protection | 16 KB (00000H–03FFFH) with lockout command sequence-ensures bootloader integrity during application updates. |
Pinout & Package
AT49BV040A-90TI is packaged in a 32-lead TSOP (Type I, 8 × 20 mm, package code 32T), compliant with JEDEC MO-142 BD. 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 supporting full 512K-word addressing; A11 is don't-care in command cycles. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during read operations. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path; carries command codes, device IDs, and memory contents; supports DATA polling on I/O7 and toggle-bit on I/O6. |
| VCC | Power Supply | 2.7–3.6 V single supply; internal regulation enables consistent timing across voltage range. |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6 V Supply Operation | Eliminates need for dual-voltage regulators or charge pumps-reduces BOM cost and layout complexity in 3V systems. |
| Boot Block Programming Lockout | 16 KB region (00000H–03FFFH) permanently protected after command sequence-prevents accidental bootloader corruption during field updates. |
| Sector-Erasable Architecture | Independent erasure of boot block, two 8 KB parameter blocks, and eight main memory blocks-enables granular firmware maintenance without full chip erase. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit logic prevent spurious writes during power transients or EMI events. |
| Green (Pb/Halide-Free) Packaging Option | RoHS-compliant TSOP variant available (e.g., AT49BV040A-90TU)-meets environmental compliance requirements for industrial and consumer products. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O mapping tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability; 90 ns read access supports real-time scan cycle execution. Use Value: Boot block lockout ensures bootloader remains intact during remote firmware upgrades, preventing system brickage during maintenance windows. |
Use Scenario: Holding calibrated sensor offsets, user preferences, and safety-critical boot parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter storage with hardware write protection; 30 µs/byte programming enables fast recalibration data writes during device self-test. Use Value: Sector erase capability allows selective update of calibration data without disturbing FDA-approved firmware in adjacent memory blocks. |
| Automotive Body Control Module (BCM) | Networking Equipment Bootloader Storage |
Use Scenario: Hosting vehicle-specific configuration data (e.g., door lock logic, lighting profiles) in BCMs subject to extended temperature cycling (-40°C to +85°C). IC Role / Device Role / Timing Role: Temperature-stable Flash memory with 10,000 write cycles; operates reliably across full industrial temp range. Use Value: Low 50 µA standby current extends battery life during vehicle sleep mode while preserving configuration integrity. |
Use Scenario: Storing secure bootloader code that validates signed firmware images before loading into RAM on enterprise switches and routers. IC Role / Device Role / Timing Role: Secure boot memory with programmable lockout; 16 KB boot block holds immutable root-of-trust code. Use Value: Once enabled, boot block lockout prevents malicious overwrite attempts-even if host processor is compromised-ensuring chain-of-trust continuity. |
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 supply; same TSOP-32 footprint but lacks boot block lockout feature. | Requires external software management for bootloader protection; no hardware-enforced write inhibition. | Choose when boot block security is handled at firmware level and lower cost is prioritized over hardware lockout. |
| MX29LV400CBTI-90G | 4 Mbit, 90 ns, 3.0–3.6 V; includes CFI-compliant command set and 16 KB boot sector-but lockout requires different command sequence (0x60/0xD0). | CFI support simplifies driver portability across vendors; boot sector size matches but lockout activation differs. | Prefer when migrating from legacy CFI-based systems or requiring standardized flash interface abstraction layers. |
Compared with SST39VF400A-90-4C-NHE and MX29LV400CBTI-90G, the AT49BV040A-90TI provides unique hardware-enforced boot block lockout using a six-cycle command (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H), eliminating reliance on software discipline for bootloader integrity-a critical advantage in safety-certified embedded systems.
Availability
AT49BV040A-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply with long-term lifecycle assurance.
Supply support for AT49BV040A-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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for embedded systems.
The AT49BV040A product line was designed for cost-sensitive, low-voltage embedded applications requiring reliable in-system reprogrammability-particularly where bootloader integrity and sector-level erase granularity are essential.
FAQ
What is the maximum operating temperature range for the AT49BV040A-90TI?
The AT49BV040A-90TI is rated for industrial temperature operation from –40°C to +85°C. This range is validated per its DC and AC specifications, including 90 ns read access time and 30 µs byte programming performance, making it suitable for deployment in factory automation, transportation, and outdoor electronics where ambient thermal stress is expected. The AT49BV040A-90TI maintains full functionality across this range without derating.
Does the AT49BV040A-90TI support hardware write protection for the entire memory array?
No-the AT49BV040A-90TI does not provide full-array hardware write protection. It offers targeted protection only for the 16 KB boot block (00000H–03FFFH) via a dedicated six-cycle command sequence. Main memory blocks and parameter blocks remain writable unless erased first. Hardware data protection (VCC sense, noise filtering, control-line inhibit) prevents accidental writes but does not enforce permanent read-only status on non-boot sectors.
How is the boot block lockout feature activated on the AT49BV040A-90TI?
The boot block lockout feature on the AT49BV040A-90TI is activated by executing a precise six-bus-cycle command sequence: load 0xAA to address 0x555, then 0x55 to 0xAAA, then 0x80 to 0x555, then 0xAA to 0x555, then 0x55 to 0xAAA, and finally 0x40 to 0x555. After a 1-second pause, the lockout becomes permanent. Once enabled, no further programming or erasure of the boot block is possible-even with power cycling.
Can the AT49BV040A-90TI be used in place of the AT49BV040A-70TI?
Yes-the AT49BV040A-90TI is functionally identical to the AT49BV040A-70TI except for guaranteed read access time: 90 ns vs. 70 ns. Both share identical pinout, command set, voltage range (2.7–3.6 V), temperature rating (–40°C to +85°C), and sector architecture. The AT49BV040A-90TI may be substituted where 90 ns timing meets system bus requirements, offering potential cost or availability advantages without layout or firmware changes.
What packaging options are available for the AT49BV040A-90TI?
The AT49BV040A-90TI is supplied in a 32-lead Thin Small Outline Package (TSOP, Type I, 8 × 20 mm), designated package code 32T. This JEDEC MO-142 BD-compliant package features gull-wing leads, 0.50 mm pitch, and is optimized for surface-mount assembly in space-constrained industrial PCBs. Green (Pb/halide-free) variants such as AT49BV040A-90TU use the same mechanical form factor.
AT49BV040A-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
AT49BV040A-90TI FAQ
1.How can I place an order for AT49BV040A-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-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 AT49BV040A-90TI reliable?
The price and inventory of AT49BV040A-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-90TI is usually 5 days.
3.What payment methods are accepted for AT49BV040A-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-90TI?
AT49BV040A-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-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 AT49BV040A-90TI?
For technical support, including AT49BV040A-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-90TI requirements.
6.How does Aetrix verify that AT49BV040A-90TI is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-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 AT49BV040A-90TI meets industry standards.
7.What is the process for return or replacement of AT49BV040A-90TI?
All AT49BV040A-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-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 AT49BV040A-90TI part is unused and in its original packaging.
Return procedure for AT49BV040A-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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