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Microchip Technology AT49LV040-90JC
- Part No.:
- AT49LV040-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LV040-90JC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
AT49LV040-90JC from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating at 3.0V–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 programmable lockout and hardware data protection for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49LV040-90JC datasheet, AT49LV040-90JC pinout, AT49LV040-90JC application, or AT49LV040-90JC equivalent, key selection criteria include boot-sector write protection, 3.0V-only operation, PLCC-32 packaging, and compatibility with standard EPROM read protocols in legacy industrial controllers.
Technical Context
The AT49LV040-90JC implements a CMOS-based NOR Flash architecture with internal program control logic and automatic timing for byte programming and chip erase. Its dual-line chip enable (CE) and output enable (OE) control enables bus contention avoidance in shared-memory systems.
It supports software-controlled operations via six-byte command sequences-including chip erase, boot block lockout, and product identification-without requiring external high-voltage programming signals. Data polling (I/O7 complement) and toggle-bit (I/O6) methods provide real-time program/erase cycle status detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits |
| Read Access Time | 90 ns maximum - ensures compatibility with 11 MHz bus timing in legacy 8-bit microcontrollers |
| Supply Voltage | 3.0V to 3.6V - single-supply operation eliminates need for voltage translators in 3.3V systems |
| Boot Block Size | 16 KB (00000H–03FFFH) - dedicated secure region for bootloader code with permanent lockout capability |
| Chip Erase Time | 10 seconds typical - full-array erase completes within fixed timeout for deterministic firmware update sequencing |
| Byte Programming Time | 30 µs typical - enables rapid field updates of small configuration or calibration data segments |
| Standby Current | 50 µA CMOS - ultra-low power retention suitable for battery-backed applications |
| Endurance | 10,000 program/erase cycles - validated lifetime for infrequent firmware revision scenarios |
Pinout & Package
AT49LV040-90JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), measuring 18.5 mm × 18.5 mm with J-bend leads. This surface-mount package supports reflow soldering and provides mechanical robustness for industrial board-level assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A15 used for main array, A16–A18 for extended regions |
| I/O0–I/O7 | Data Input/Output | 8-bit bidirectional data bus compatible with standard microprocessor data bus timing and drive strength |
| CE | Chip Enable | Active-low chip select; must be low for read/write access; high-Z output when deasserted |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention during multi-device sharing |
| WE | Write Enable | Active-low write strobe; latches data on rising edge when CE is active; inhibits writes if held high |
| VCC | Power Supply | +3.0V to +3.6V supply; includes VCC sense circuitry to disable programming below 1.8V |
| GND | Ground | Reference return path for all I/O and core logic; decoupling required per JEDEC PLCC layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16 KB region (00000H–03FFFH) permanently protected after 6-command sequence - prevents accidental bootloader corruption |
| Data Polling | I/O7 returns complement of last programmed byte until completion - enables polling-based firmware update without interrupt overhead |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibit logic prevent spurious writes during power transients |
| Software Product ID | Manufacturer code 1FH and device code 13H readable via 3-cycle command - allows runtime device verification in field-upgrade firmware |
| Toggle Bit Detection | I/O6 toggles during program/erase; stops when complete - provides alternative non-intrusive status monitoring method |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into microcontroller address space; accessed via standard EPROM read protocol with 90 ns timing compliance. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; 50 µA standby current extends uptime during brownout conditions. | Use Scenario: Replacing obsolete EPROMs in legacy medical device controllers where PCB layout prohibits redesign but requires in-system reprogrammability. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement for 27C040 EPROM; retains identical PLCC-32 footprint and address/data bus interface. Use Value: Eliminates UV eraser dependency and socket wear; 3.0V–3.6V operation matches existing 3.3V supply rails without level-shifting. |
| Automotive Diagnostic Tool Calibration Storage | Point-of-Sale Terminal Configuration Memory |
Use Scenario: Holding calibration tables and diagnostic routines in handheld OBD-II scanners deployed across automotive service bays. IC Role / Device Role / Timing Role: Read-mostly storage with occasional field updates; accessed during tool initialization and firmware patch loading. Use Value: 10-second chip erase enables fast recalibration uploads; hardware data protection prevents corruption during vehicle battery fluctuations. | Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver configurations in retail POS terminals with limited physical service access. IC Role / Device Role / Timing Role: System-level configuration memory mapped at fixed base address; updated via serial host interface using byte-programming commands. Use Value: 30 µs/byte programming allows sub-second configuration changes; boot block lockout secures core terminal boot code from tampering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-90-4C-NHE | 4 Mbit, 3.3V-only, 90 ns access, PLCC-32; lacks boot block lockout but adds sector erase granularity | Supports partial-sector erase (4 KB blocks); unsuitable where bootloader immutability is mandatory | Select when frequent partial updates outweigh need for permanent boot protection |
| MX29LV040CTTI-90G | 4 Mbit, 3.0V–3.6V, 90 ns, PLCC-32; includes 16 KB boot sector but uses different command set and lockout mechanism | Requires modified firmware driver for lockout activation; not software-compatible with AT49LV040-90JC | Select only with full driver revalidation; avoid for drop-in replacements |
Compared with SST39VF040-90-4C-NHE and MX29LV040CTTI-90G, the AT49LV040-90JC uniquely delivers verified boot block lockout with Atmel's documented 6-command sequence, ensuring bootloader integrity without firmware-level intervention - critical for safety-critical embedded deployments.
Availability
AT49LV040-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded bootloader memory, and automotive diagnostic tool calibration storage requiring stable component supply and long-term obsolescence management.
Supply support for AT49LV040-90JC 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and consumer applications before its 2016 acquisition.
The AT49LV040-90JC belongs to Atmel's Battery-Voltage™ Flash family, engineered specifically for 3.0V–3.6V systems needing EPROM-compatible read behavior with in-system reprogrammability and hardware-enforced boot code protection.
FAQ
What is the operating voltage range for the AT49LV040-90JC?
The AT49LV040-90JC operates over a supply voltage range of 3.0V to 3.6V. This single-voltage specification eliminates the need for separate programming voltages and ensures compatibility with standard 3.3V system rails. The device incorporates VCC sense circuitry that disables programming if VCC drops below approximately 1.8V, preventing unintended writes during power instability. This voltage range is confirmed in the DC Operating Range table on page 5 of the official Atmel datasheet Rev. 0679D–03/01.
Does the AT49LV040-90JC support true byte-level programming?
Yes, the AT49LV040-90JC supports byte-by-byte programming with a typical time of 30 µs per byte. Each byte is written independently without affecting adjacent locations, enabling precise updates to configuration data or calibration values. The device uses internal command registers and automatically generates required programming pulses - no external high-voltage signals are needed. This capability is explicitly stated in the Features section and verified in the Byte Programming section on page 2 of the AT49LV040-90JC datasheet.
How is the boot block protected on the AT49LV040-90JC?
The AT49LV040-90JC includes a 16 KB boot block (addresses 00000H–03FFFH) with a programmable lockout feature. Once enabled via a specific six-command sequence (AAh, 55h, 80h, AAh, 55h, 40h), the boot block becomes permanently write-protected - neither erasure nor programming is possible. Software lockout detection is available by reading I/O0 during product identification mode. This protection mechanism is detailed in the Boot Block Programming Lockout section on pages 2–3 of the AT49LV040-90JC datasheet.
What package type does the AT49LV040-90JC use?
The AT49LV040-90JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, designated as "32J" in Atmel's ordering information. Its dimensions are 18.5 mm × 18.5 mm with J-bend leads, compliant with JEDEC standard MS-016 AE. This package supports surface-mount assembly and provides mechanical stability for industrial applications. Package details, including lead pitch and contour drawings, appear on page 11 of the AT49LV040-90JC datasheet Rev. 0679D–03/01.
Can the AT49LV040-90JC be used as a direct replacement for standard EPROMs?
Yes, the AT49LV040-90JC is functionally compatible with 27C040 EPROMs in read mode: it uses identical pinout (PLCC-32), same address/data bus structure, and EPROM-like read timing (CE/OE controlled). However, programming requires software command sequences instead of UV erasure and high-voltage pulses. For read-only applications or where firmware update capability is added, it serves as a drop-in replacement; full reprogramming integration requires adapting host controller firmware to issue Atmel-specific commands.
AT49LV040-90JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49LV040-90JC FAQ
1.How can I place an order for AT49LV040-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV040-90JC 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 AT49LV040-90JC reliable?
The price and inventory of AT49LV040-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV040-90JC is usually 5 days.
3.What payment methods are accepted for AT49LV040-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV040-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV040-90JC?
AT49LV040-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV040-90JC 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 AT49LV040-90JC?
For technical support, including AT49LV040-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV040-90JC requirements.
6.How does Aetrix verify that AT49LV040-90JC is sourced from the original manufacturer or authorized distributors?
All AT49LV040-90JC 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 AT49LV040-90JC meets industry standards.
7.What is the process for return or replacement of AT49LV040-90JC?
All AT49LV040-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV040-90JC, 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 AT49LV040-90JC part is unused and in its original packaging.
Return procedure for AT49LV040-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV040-90JC Tags
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