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Microchip Technology AT29LV040A-20JI
- Part No.:
- AT29LV040A-20JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV040A-20JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT29LV040A-20JI 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, 200 ns maximum read access time, 20 ms max sector program cycle, and industrial temperature range (–40°C to +85°C). It supports in-system reprogramming via software data protection and includes two 16K-byte boot blocks with independent programming lockout for secure firmware storage.
For engineers reviewing the AT29LV040A-20JI datasheet, AT29LV040A-20JI pinout, AT29LV040A-20JI application, or AT29LV040A-20JI equivalent, key selection considerations include sector-based erase/program operation, DATA polling and toggle-bit end-of-write detection, CMOS/TTL-compatible I/O, and dual-package availability (PLCC-32 and TSOP-32) with green Pb/halide-free options.
Technical Context
The AT29LV040A-20JI implements a sector-erase Flash architecture with 2048 individually erasable 256-byte sectors, internal address/data latches enabling microprocessor-speed byte loading, and automatic internal erase-and-program sequencing triggered after valid 3-byte unlock command (AAh/55h/A0h). Boot block lockout uses a 7-command enable sequence targeting addresses 00000H and FFFFFH.
It operates exclusively from a single 3.3V ±0.3V supply, with hardware protections including VCC sense (<1.8V inhibit), 10 ms power-on delay, noise filtering (<15 ns pulse rejection), and control-line gating (OE low/CE high/WE high disables programming). Input levels tolerate 0–5.5V on address/control pins but restrict I/O lines to 0–3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for firmware images up to 512 KB in embedded boot applications. |
| Read Access Time | 200 ns max - enables direct interface with 5 MHz bus systems without wait states. |
| Supply Voltage | 3.3V ±0.3V only - eliminates need for dual-voltage rails or charge pumps during programming. |
| Active Current | 15 mA max - supports low-power operation in battery-backed or energy-constrained systems. |
| Standby Current | 50 µA max (industrial temp) - reduces quiescent power in sleep-mode embedded controllers. |
| Sector Size | 256 bytes - allows fine-grained firmware updates without erasing full device; matches typical bootloader partitioning. |
| Endurance | 10,000 write/erase cycles per sector - supports field firmware upgrades over product lifetime. |
| Operating Temp | –40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor equipment. |
Pinout & Package
AT29LV040A-20JI is available in 32-lead PLCC (32J) and 32-lead TSOP (32T) packages. Both are RoHS-compliant and Pb/halide-free. The PLCC variant uses J-leads with 1.27 mm pitch; TSOP uses gull-wing leads with 0.5 mm pitch and 8 × 20 mm footprint.
| 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 outputs to high-Z and enables standby mode. |
| OE | Output Enable | Active-low output control; used with CE to gate data reads and prevent bus contention. |
| WE | Write Enable | Active-low write strobe; controls byte load timing and initiates sector programming when CE is also low. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit multiplexed data path for read outputs and program inputs; TTL/CMOS compatible with 3.3V logic levels. |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet - no pull-up/down or routing required. |
| VCC | Power Supply | 3.3V ±0.3V main supply; internal voltage regulation ensures stable core operation across rail tolerance. |
| GND | Ground Reference | Primary signal and power return; requires low-impedance connection to minimize noise coupling during programming. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (AAh/55h/A0h) prevents accidental writes - essential for field-upgradable firmware integrity. |
| Boot Block Lockout | Two independent 16K-byte blocks (lowest and highest addresses) can be permanently write-locked - secures bootloader code against corruption. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, bus-compatible program completion detection - eliminates need for fixed delays or external timers. |
| Single 3.3V Operation | Eliminates high-voltage programming circuitry - simplifies PCB design, reduces BOM count, and improves system reliability. |
| 256-Byte Sector Architecture | Enables partial reprogramming without full-chip erase - critical for OTA updates where bandwidth and flash wear are constrained. |
| Industrial Temperature Range | Rated –40°C to +85°C with validated DC/AC specs - suitable for deployment in harsh environments without derating. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Nonvolatile program memory holding ladder logic runtime, I/O mapping tables, and calibration constants; accessed via parallel bus at ≤5 MHz. Use Value: 200 ns read access enables zero-wait-state execution; sector erase allows incremental firmware patching without disrupting operational memory partitions. |
Use Scenario: Holding boot code and CAN protocol stack in body control units installed near vehicle door modules subject to thermal cycling. IC Role / Device Role / Timing Role: Primary boot ROM providing secure startup sequence; boot blocks locked to prevent overwrite during ECU reflash operations. Use Value: Dual boot block lockout ensures bootloader integrity; industrial temp rating guarantees reliable operation across –40°C cold cranking to +85°C under-hood conditions. |
| Medical Diagnostic Equipment | Network Router Boot Image |
|
Use Scenario: Storing FPGA configuration bitstreams and application firmware in portable ultrasound devices requiring long-term data retention and field-upgradability. IC Role / Device Role / Timing Role: Configuration memory interfaced directly to microcontroller's external bus; programmed via in-system commands during service mode. Use Value: 10,000-cycle endurance supports repeated firmware validation and regulatory-compliant version rollbacks; low 50 µA standby current extends battery life in portable units. |
Use Scenario: Hosting compressed Linux kernel and initramfs in enterprise-grade routers where firmware updates occur remotely over management interfaces. IC Role / Device Role / Timing Role: Parallel NOR Flash acting as primary boot device for MIPS/ARM SoC; accessed during Power-On Self-Test (POST) before DRAM initialization. Use Value: 256-byte sector granularity enables atomic update of bootloader sections; DATA polling ensures deterministic boot timing regardless of temperature or voltage variation. |
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-EKE | 4 Mbit, 70 ns read access, 3.3V operation, 512K × 8 organization, same PLCC-32/TSOP-32 packaging. | Lacks boot block lockout; uses different software unlock sequence (5555h/2AAAh/AAAh); no toggle-bit detection. | Preferred when faster read speed is critical and boot security is managed externally via MCU firmware. |
| MX29LV400CBTI-70G | 4 Mbit, 70 ns read, 3.3V, 512K × 8, PLCC-32/TSOP-32; includes CFI-compliant command set and 16K boot blocks. | Boot block lockout implemented differently (hardware strap option); requires CFI query for parameter discovery. | Recommended for designs requiring industry-standard CFI interface and broader ecosystem toolchain support. |
Compared with SST39VF400A-70-4C-EKE and MX29LV400CBTI-70G, the AT29LV040A-20JI offers deterministic 200 ns read timing with integrated boot block lockout and dual end-of-write detection methods - making it optimal for cost-sensitive industrial systems prioritizing firmware security and predictable timing behavior over raw speed.
Availability
AT29LV040A-20JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, medical diagnostic equipment, network router boot image hosting, and embedded system boot ROM applications requiring stable component supply across extended lifecycle commitments.
Supply support for AT29LV040A-20JI 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, with a legacy of robust nonvolatile memory solutions for industrial and automotive markets.
The AT29LV040A-20JI belongs to Atmel's 3.3V-only Flash memory family designed specifically for in-system programmability in resource-constrained embedded systems requiring secure, sector-erasable nonvolatile storage with industrial-grade reliability.
FAQ
What is the guaranteed read access time for AT29LV040A-20JI?
The AT29LV040A-20JI has a maximum guaranteed read access time of 200 ns under industrial temperature conditions (–40°C to +85°C) and 3.3V ±0.3V supply. This specification is verified per AC Read Characteristics table in the official datasheet and applies to both PLCC-32 and TSOP-32 package variants of the AT29LV040A-20JI.
Does AT29LV040A-20JI support hardware reset or power-on initialization sequences?
The AT29LV040A-20JI does not include an internal hardware reset function. However, the datasheet specifies a mandatory 20 ms delay after VCC reaches minimum operating voltage before initiating any operational mode. This delay ensures internal circuit stabilization and is required prior to issuing read or program commands to the AT29LV040A-20JI.
Can AT29LV040A-20JI be used with 5V-tolerant microcontrollers?
Yes - the AT29LV040A-20JI address and control inputs (A0–A18, CE, OE, WE) tolerate 0–5.5V logic levels while operating from a 3.3V supply, enabling direct interface with 5V-tolerant MCUs. However, I/O0–I/O7 pins are limited to 0–3.6V and must not exceed this range, requiring level-shifting if the host MCU drives outputs above 3.6V.
How is boot block lockout enabled on AT29LV040A-20JI?
Boot block lockout on the AT29LV040A-20JI is enabled via a seven-command software sequence targeting specific addresses (e.g., 00000H for lower block, FFFFFH for upper block) with defined data values (80h/40h/00h/FFh). Once activated, the lockout is permanent and prevents all erase/program operations on that 16K-byte block - a feature confirmed in the AT29LV040A-20JI datasheet Section 25.
What packaging options are available for AT29LV040A-20JI?
The AT29LV040A-20JI is offered exclusively in two RoHS-compliant, green (Pb/halide-free) packages: 32-lead Plastic J-Leaded Chip Carrier (PLCC-32, suffix 'J') and 32-lead Thin Small Outline Package (TSOP-32, suffix 'T'). Both variants carry the 'I' suffix denoting industrial temperature grade (–40°C to +85°C) and are fully interchangeable at the functional level.
AT29LV040A-20JI 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:
- 200 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-20JI FAQ
1.How can I place an order for AT29LV040A-20JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-20JI 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-20JI reliable?
The price and inventory of AT29LV040A-20JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-20JI is usually 5 days.
3.What payment methods are accepted for AT29LV040A-20JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-20JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-20JI?
AT29LV040A-20JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-20JI 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-20JI?
For technical support, including AT29LV040A-20JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-20JI requirements.
6.How does Aetrix verify that AT29LV040A-20JI is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-20JI 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-20JI meets industry standards.
7.What is the process for return or replacement of AT29LV040A-20JI?
All AT29LV040A-20JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-20JI, 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-20JI part is unused and in its original packaging.
Return procedure for AT29LV040A-20JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV040A-20JI Tags
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