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Microchip Technology AT29LV020-12JI
- Part No.:
- AT29LV020-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV020-12JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
AT29LV020-12JI from Atmel is a 2-Mbit (256K × 8) 3.3V-only Flash memory IC organized as 262,144 bytes with 120 ns read access time, 20 ms sector program cycle, and 10,000 write/erase endurance - used for firmware storage in industrial microcontroller boot systems requiring in-system reprogrammability without high-voltage programming.
For engineers reviewing the AT29LV020-12JI datasheet, AT29LV020-12JI pinout, AT29LV020-12JI application, or AT29LV020-12JI equivalent, key selection criteria include industrial temperature support (−40°C to +85°C), PLCC-32 package compatibility, software data protection sequence, boot block lockout capability, and DATA polling/Toggle Bit status detection methods.
Technical Context
The AT29LV020-12JI implements sector-based flash architecture with 1024 × 256-byte sectors and two independent 8K-byte boot blocks featuring programmable lockout. It uses CMOS-compatible 3.3V-only operation with TTL-level input tolerance up to 5.5V on address/control pins and 3.6V on I/O lines.
Programming relies on a three-byte software unlock sequence (AAh→55h→A0h) followed by byte-load timing within 150 µs intervals; internal erase-and-program automation eliminates external erase commands. Status detection is supported via DATA polling on I/O7 and Toggle Bit behavior on I/O6 during program/erase cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8 bits) - supports full firmware images for 8-bit/16-bit MCUs with space for bootloader + application code. |
| Read Access Time | 120 ns - enables direct execution from flash in systems with ≤8.3 MHz bus timing constraints. |
| Supply Voltage | 3.3 V ± 0.3 V - compatible with standard LDO-regulated 3.3V rails; no separate 5V or 12V required. |
| Active Current | 15 mA at 5 MHz - low power consumption suitable for battery-backed or energy-constrained embedded hosts. |
| Standby Current | 50 µA (industrial range) - minimizes quiescent draw during system sleep modes. |
| Endurance | >10,000 program/erase cycles per sector - sufficient for field firmware updates over multi-year product lifecycle. |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor equipment. |
Pinout & Package
AT29LV020-12JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016 Variation AE, with 1.27 mm pitch and 12.3–12.6 mm × 14.9–15.1 mm footprint. Pin 1 identifier is a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-byte addressing; A8–A17 select sector, A0–A7 select byte within sector. |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-impedance state. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access. |
| WE | Write Enable | Active-low write strobe; initiates byte load during software-protected programming sequences. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries data during reads and inputs during programming; supports DATA polling on I/O7 and Toggle Bit on I/O6. |
| NC | No Connect | Pin 29 (PLCC top view) is unconnected; must not be tied to any voltage or signal. |
| VCC | Power Supply | 3.3V supply input; requires local 0.1 µF ceramic decoupling near pin. |
| GND | Ground | Signal and power ground reference; connected to pin 16 in PLCC layout. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h→2AAAh→5555h) prevents accidental writes - critical for field-upgradable systems where noise or reset glitches could corrupt firmware. |
| Boot Block Lockout | Two independent 8K-byte blocks (first/last 8K) can be permanently write-locked via 7-command algorithm - secures bootloader code against overwrite during application updates. |
| Sector Programming | 256-byte granularity allows partial reprogramming without erasing entire device - reduces update time and wear on unaffected sectors. |
| Status Detection | Hardware-supported DATA polling (I/O7) and Toggle Bit (I/O6) eliminate need for fixed delay timers - improves reliability across voltage/temperature variations. |
| Input Voltage Tolerance | Address and control inputs accept 0–5.5V signals while operating at 3.3V - simplifies interfacing with 5V microcontrollers without level shifters. |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Bootloader |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and real-time task scheduler; accessed at power-on reset with 120 ns read latency. Use Value: Industrial temperature rating (−40°C to +85°C) and 10,000-cycle endurance ensure reliable operation over 10+ years of scheduled firmware updates. |
Use Scenario: Hosting secure bootloader and recovery image in Ethernet/Wi-Fi routers requiring fail-safe firmware rollback after OTA updates. IC Role / Device Role / Timing Role: Dual-boot memory with lockable lower 8K block storing immutable bootloader; upper 8K block holds updatable application firmware. Use Value: Boot block lockout prevents corruption of startup code during network-initiated reflash, enabling certified secure boot compliance. |
| Automotive Body Control Module | Medical Diagnostic Equipment Configuration |
Use Scenario: Retaining calibration tables, sensor offsets, and CAN message routing logic in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: In-system programmable flash providing persistent parameter storage accessible via microcontroller SPI-to-parallel bridge during service mode. Use Value: 3.3V-only operation eliminates need for charge pumps or dual supplies, reducing BOM cost and board area in space-constrained modules. |
Use Scenario: Storing device-specific calibration coefficients, regulatory compliance settings, and user interface language packs in portable ultrasound and ECG units. IC Role / Device Role / Timing Role: Secure configuration memory with software-protected writes - only enabled during authorized service technician sessions using validated command sequences. Use Value: DATA polling and Toggle Bit enable deterministic firmware update completion detection, meeting IEC 62304 software lifecycle requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF200A-70-4C-NHE | 70 ns read access, 3.0–3.6V supply, 44-pin TSOP; lacks boot block lockout and uses different unlock sequence. | Higher speed but no hardware-enforced bootloader protection; requires redesign of lockout logic in host firmware. | Choose when faster read timing is critical and bootloader security is managed entirely in software. |
| MX29LV200CTTI-70G | 70 ns read, 3.0–3.6V, 48-pin TSOP; includes CFI-compliant command set and 16-bit data bus option. | Supports wider data paths and standardized command interface but requires PCB layout change due to different pinout and package size. | Prefer for new designs needing CFI compatibility or future scalability to larger densities with same command structure. |
Compared with SST39VF200A-70-4C-NHE and MX29LV200CTTI-70G, the AT29LV020-12JI offers verified boot block lockout and PLCC-32 packaging ideal for legacy industrial PCBs, while trading off raw speed for deterministic in-system reprogrammability and proven field reliability.
Availability
AT29LV020-12JI is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostic instruments, and automotive body electronics requiring stable component supply with long-term lifecycle support.
Supply support for AT29LV020-12JI 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, nonvolatile memory, and secure authentication devices.
The AT29LV020-12JI belongs to Atmel's LV-series Flash memory product line, designed specifically for 3.3V embedded systems needing robust in-circuit reprogrammability, sector-level flexibility, and industrial-grade reliability.
FAQ
What is the maximum operating temperature range for the AT29LV020-12JI?
The AT29LV020-12JI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the DC and AC Operating Range table of the official Atmel datasheet (Rev. 0565C), where "AT29LV020-12JI" is explicitly listed under the Industrial column. The device maintains full functionality-including 120 ns read access and 20 ms sector programming-across this full range.
Does the AT29LV020-12JI require high-voltage programming signals?
No, the AT29LV020-12JI operates exclusively at 3.3V and does not require high-voltage programming inputs. All programming is performed using standard 3.3V logic levels and a software-controlled three-byte unlock sequence (AAh→55h→A0h). The datasheet explicitly states "Single Voltage, Range 3V to 3.6V Supply" and "3-volt Only Read and Write Operation", confirming no 5V, 12V, or other elevated voltages are needed for AT29LV020-12JI operation.
How many sectors does the AT29LV020-12JI have, and what is the size of each sector?
The AT29LV020-12JI contains 1024 sectors, each 256 bytes in size. This is documented in the Features section ("1024 Sectors (256 Bytes/Sector)") and reinforced in the Description ("Sector Program Operation") and Programming Algorithm sections of the Atmel datasheet. Sector addressing uses A8–A17, enabling precise targeting of individual 256-byte regions during AT29LV020-12JI reprogramming.
Can the boot blocks of the AT29LV020-12JI be unlocked after programming lockout is enabled?
No - once the boot block lockout feature is activated on either the lower or upper 8K-byte block of the AT29LV020-12JI, it is permanent and irreversible. The datasheet states: "Once the programming lockout feature has been activated, the data in that block can no longer be erased or programmed". The lockout is implemented via fuse-like internal circuitry triggered by the seven-command enable algorithm, and no command or voltage condition restores write capability to a locked boot block.
What package type is used for the AT29LV020-12JI?
The AT29LV020-12JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, identified as "32J" in the Ordering Information table. Mechanical drawings and dimensions for this package are provided in the datasheet (page 13), confirming compliance with JEDEC MS-016 Variation AE. The PLCC-32 footprint is distinct from the TSOP-32 option (32T) offered for other variants like AT29LV020-12TC.
AT29LV020-12JI 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ms
- Access Time:
- 120 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)
AT29LV020-12JI FAQ
1.How can I place an order for AT29LV020-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV020-12JI 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 AT29LV020-12JI reliable?
The price and inventory of AT29LV020-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV020-12JI is usually 5 days.
3.What payment methods are accepted for AT29LV020-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV020-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV020-12JI?
AT29LV020-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV020-12JI 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 AT29LV020-12JI?
For technical support, including AT29LV020-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV020-12JI requirements.
6.How does Aetrix verify that AT29LV020-12JI is sourced from the original manufacturer or authorized distributors?
All AT29LV020-12JI 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 AT29LV020-12JI meets industry standards.
7.What is the process for return or replacement of AT29LV020-12JI?
All AT29LV020-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV020-12JI, 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 AT29LV020-12JI part is unused and in its original packaging.
Return procedure for AT29LV020-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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