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Microchip Technology AT29LV040A-15JI
- Part No.:
- AT29LV040A-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV040A-15JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,275
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Product details
Overview
AT29LV040A-15JI from Atmel is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC organized as 524,288 words by 8 bits, featuring 256-byte sector architecture, 150 ns read access time, and dual 16K-byte boot blocks with independent programming lockout - used for firmware storage and in-system reprogramming in industrial embedded controllers.
For engineers reviewing the AT29LV040A-15JI datasheet, AT29LV040A-15JI pinout, AT29LV040A-15JI application, or AT29LV040A-15JI equivalent, key selection criteria include industrial temperature range (-40°C to +85°C), software data protection compliance, sector erase/program timing (20 ms max), CMOS standby current (50 µA), and PLCC-32 package compatibility with legacy board layouts.
Technical Context
The AT29LV040A-15JI implements a sector-based Flash architecture with 2048 individually erasable 256-byte sectors and two dedicated 16K-byte boot blocks. It uses a three-byte software command sequence (5555H/2AAAH/A0H) to enable byte loading and internal auto-erase-before-program logic.
Operation relies on standard parallel interface control signals (CE/OE/WE) with TTL/CMOS-compatible inputs and outputs, DATA polling (I/O7) and toggle-bit (I/O6) methods for program cycle completion detection, and hardware protections including VCC sense (<1.8V inhibit), noise filtering (<15 ns pulse rejection), and write-inhibit via CE/OE/WE state control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 150 ns maximum - supports direct execution from flash in systems with ≤6.7 MHz bus timing |
| Supply Voltage | 3.0 V to 3.6 V only - eliminates need for 5V or 12V programming voltages, simplifying power design |
| Active Current | 15 mA typical at 5 MHz - enables low-power operation during active firmware reads |
| Standby Current | 50 µA max (industrial temp) - critical for battery-backed or energy-sensitive applications |
| Sector Size | 256 bytes per sector - allows fine-grained firmware updates without full chip erase |
| Endurance | 10,000 program/erase cycles per sector - supports field firmware upgrades over product lifetime |
Pinout & Package
AT29LV040A-15JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), compliant with JEDEC MS-016 Variation AE, with 1.27 mm pitch and 12.45 mm × 14.95 mm body dimensions. Pin 1 identifier is a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within 256-byte sector |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces output high-Z and inhibits programming |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during read operations |
| WE | Write Enable | Active-low write strobe; controls latching of address/data during sector programming and byte load cycles |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path; carries command codes, sector data, manufacturer/device ID, and polling status |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid reliability risk |
| VCC | Power Supply | 3.3V ±0.3V supply; internal voltage regulation ensures stable core operation across industrial temperature range |
| GND | Ground | Reference return for all I/O and core circuitry; requires low-impedance PCB plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555H/2AAAH/A0H) required before any sector programming - prevents accidental firmware corruption |
| Dual Boot Block Lockout | Independent 16K-byte lockout for lower (0x00000–0x03FFF) and upper (0x7C000–0x7FFFF) memory regions - secures bootloader code against overwrite |
| DATA Polling & Toggle Bit | I/O7 complement polling and I/O6 toggling provide real-time, bus-compatible program completion feedback without external timers or interrupts |
| Single-Cycle Sector Erase/Program | Entire 256-byte sector erased and programmed automatically after byte load - eliminates separate erase command step |
| Green Packaging Option | Pb/Halide-free PLCC package available (AT29LV040A-15JU) - meets RoHS compliance requirements for industrial deployments |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating continuously in factory environments with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 150 ns read access for deterministic scan-cycle execution. Use Value: Industrial temperature rating (-40°C to +85°C) and 50 µA standby current ensure reliable long-term operation with minimal thermal drift or power budget impact. | Use Scenario: Hosting secure bootloader and calibration data in Class II medical instruments requiring traceable firmware integrity and field-upgradable diagnostics. IC Role / Device Role / Timing Role: Boot block-protected Flash memory; lower 16K-byte block stores immutable startup code, preventing unauthorized modification. Use Value: Independent boot block lockout (FE/FF status detectable via software ID mode) enables certified secure boot without external security ICs. |
| Telecom Line Card Configuration | Automotive Body Control Module |
Use Scenario: Storing port mapping tables, protocol stacks, and vendor-specific configuration parameters in carrier-grade DSLAM line cards deployed in temperature-variable central offices. IC Role / Device Role / Timing Role: Sector-erasable Flash memory interfaced via parallel bus; supports hot-swap firmware updates without system reset. Use Value: 2048-sector granularity (256 bytes/sector) allows atomic updates of individual configuration modules, minimizing update window and downtime risk. | Use Scenario: Retaining vehicle-specific calibration data, lighting profiles, and door module logic in automotive BCMs exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Automotive-qualified nonvolatile memory; operates reliably across -40°C to +85°C with 10,000-cycle endurance for recalibration events. Use Value: Hardware protections (VCC sense, noise filtering, write inhibit) prevent spurious writes during ignition transients or ESD events in harsh electrical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns access, 3.3V supply, TSOP-48 package - faster but larger footprint and no boot block lockout | Lacks dedicated boot block programming lockout; requires external logic or firmware layer for bootloader protection | Choose when higher speed (70 ns) is prioritized over bootloader security and PLCC-32 footprint compatibility |
| MX29LV400CBTI-70G | 4 Mbit, 70 ns access, 3.0–3.6V supply, TSOP-48 - includes CFI query support and 64K/8K/16K block sizes | Uses different command set (CFI-compliant); boot block layout differs (top/bottom 16K), but lockout mechanism is not software-configurable like AT29LV040A-15JI | Prefer for new designs needing standardized CFI interface and broader ecosystem tool support, accepting TSOP-48 layout change |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CBTI-70G, the AT29LV040A-15JI offers unique software-enabling boot block lockout with FE/FF status readback, PLCC-32 compatibility for legacy industrial PCBs, and proven 10,000-cycle endurance at industrial temperature - making it optimal for retrofit and long-lifecycle applications where security and footprint retention are critical.
Availability
AT29LV040A-15JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and telecom line card configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29LV040A-15JI 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 U.S.-based semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs.
The AT29LV040A-15JI belongs to Atmel's 3-volt-only Flash memory product line, designed specifically for in-system programmability, industrial temperature resilience, and bootloader security in embedded systems with legacy parallel bus interfaces.
FAQ
What is the operating temperature range for the AT29LV040A-15JI?
The AT29LV040A-15JI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table (Section 6) of the official Atmel datasheet (0334G–FLASH–2/05), where the "I" suffix denotes industrial grade. The device maintains full functionality-including 150 ns read access, 20 ms sector program time, and 50 µA standby current-across this entire range.
Does the AT29LV040A-15JI require high-voltage programming signals?
No, the AT29LV040A-15JI does not require high-voltage programming signals. It operates exclusively from a 3.0 V to 3.6 V supply and uses only standard 3.3V-level control signals (CE, OE, WE) and address/data bus transitions. Programming is enabled solely via the three-byte software unlock sequence (5555H/2AAAH/A0H), as detailed in Section 4.2 and Figure 17 of the datasheet. No external 12V or 5V programming voltage is needed.
How is boot block programming lockout verified on the AT29LV040A-15JI?
Boot block lockout status on the AT29LV040A-15JI is verified using the Software Product Identification mode. After entering identification mode (via AAH/55H/90H commands), reading address 00002H returns FE if the lower boot block (0x00000–0x03FFF) is unlocked or FF if locked; reading 7FFF2H yields the same for the upper boot block (0x7C000–0x7FFFF). This is explicitly defined in Section 4.9.1 and Figure 23 of the datasheet.
What package type is used for the AT29LV040A-15JI?
The AT29LV040A-15JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated "32J" in Atmel's ordering information (Section 26.1). Its mechanical dimensions conform to JEDEC MS-016 Variation AE, with a 12.45 mm × 14.95 mm body and 1.27 mm lead pitch. This is distinct from the TSOP-32 variant (32T) used in the -15TI version.
Can the AT29LV040A-15JI be used in a 5V system interface?
The AT29LV040A-15JI's address and control inputs (A0–A18, CE, OE, WE) tolerate 0–5.5V logic levels when powered from 3.3V ±10%, per Section 4.4 ("Input Levels") of the datasheet. However, I/O0–I/O7 pins are limited to 0–3.6V and must not be driven above VCC + 0.6V. Therefore, direct connection to 5V bus drivers is unsafe unless level-shifted; 5V-tolerant inputs do not extend to data lines.
AT29LV040A-15JI 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:
- 20ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29LV040A-15JI FAQ
1.How can I place an order for AT29LV040A-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-15JI 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 AT29LV040A-15JI reliable?
The price and inventory of AT29LV040A-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-15JI is usually 5 days.
3.What payment methods are accepted for AT29LV040A-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-15JI?
AT29LV040A-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-15JI 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 AT29LV040A-15JI?
For technical support, including AT29LV040A-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-15JI requirements.
6.How does Aetrix verify that AT29LV040A-15JI is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-15JI 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 AT29LV040A-15JI meets industry standards.
7.What is the process for return or replacement of AT29LV040A-15JI?
All AT29LV040A-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-15JI, 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 AT29LV040A-15JI part is unused and in its original packaging.
Return procedure for AT29LV040A-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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