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Microchip Technology AT29LV020-10JU-T
- Part No.:
- AT29LV020-10JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV020-10JU-T.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,153
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Product details
Overview
AT29LV020-10JU-T from Microchip Technology (formerly Atmel) is a 2-Mbit (256K × 8) 3.3V-only parallel Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It features 100 ns read access time, sector-based reprogramming with 1024 × 256-byte sectors, software data protection, and two 8K-byte boot blocks with independent programming lockout. It operates across the industrial temperature range (–40°C to +85°C) in PLCC-32 packaging.
For engineers reviewing the AT29LV020-10JU-T datasheet, AT29LV020-10JU-T pinout, AT29LV020-10JU-T application, or AT29LV020-10JU-T equivalent, key selection considerations include its single 3.3V supply operation, 20 ms sector program cycle, DATA polling and toggle-bit end-of-write detection, CMOS/TTL-compatible I/O, and boot-block lockout for secure firmware boot code storage.
Technical Context
The AT29LV020-10JU-T implements a sector-erase-and-program architecture where each 256-byte sector is erased and written in a single internal cycle using software command sequences (e.g., 0x5555/0x2AAA/0xA0). It supports standard EPROM-like read timing with CE/OE dual enable control and high-impedance outputs during deselect.
Hardware protections include VCC sense (<1.8V inhibit), 10 ms power-on delay, noise filtering on WE/CE (<15 ns pulse rejection), and program-inhibit logic (OE low, CE high, or WE high). Input levels tolerate 0–5.5V on address/control pins and 0–3.6V on I/O pins while operating at 3.3V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K bytes for direct byte-addressable access |
| Read Access Time | 100 ns max - enables direct interface with 10 MHz microcontrollers without wait states |
| Supply Voltage | 3.0 V to 3.6 V - eliminates need for 5V rails or level shifters in 3.3V systems |
| Active Current | 15 mA max at 5 MHz - supports low-power active operation in battery-backed or portable designs |
| Standby Current | 50 µA CMOS standby - reduces quiescent power in sleep-mode embedded applications |
| Sector Size | 256 bytes per sector - balances granularity for firmware updates and erase efficiency |
| Endurance | 10,000 program/erase cycles per sector - ensures long-term reliability in field-upgradable systems |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
Pinout & Package
AT29LV020-10JU-T is housed in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package per JEDEC MS-016, Variation AE. Dimensions: 12.57 mm × 15.11 mm × 3.56 mm (max height), with 1.27 mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-byte addressing; A0–A7 select byte within sector, A8–A17 select sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for reads, writes, and command loading; TTL/CMOS compatible |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces output high-Z and disables programming |
| OE | Output Enable | Active-low output control; used with CE for bus contention management during reads |
| WE | Write Enable | Active-low write strobe; initiates byte load and sector programming when CE is low and OE is high |
| NC | No Connect | Pin 16 (PLCC top view) is unconnected - must remain floating, not tied to VCC/GND |
| VCC | Power Supply | 3.0–3.6 V supply input; internal VCC sense prevents programming below ~1.8 V |
| GND | Ground | Reference return for all signals and power; requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.3V Supply Operation | Eliminates need for 5V programming voltage or external charge pumps - simplifies power design and PCB layout |
| Software Data Protection | Three-command unlock sequence (0x5555/0x2AAA/0xA0) required before any sector write - prevents accidental firmware corruption |
| Boot Block Lockout | Two independent 8K-byte blocks (first/last 8K) can be permanently write-locked - secures bootloader code against overwrite |
| DATA Polling & Toggle Bit | I/O7 complement polling and I/O6 toggle provide hardware-agnostic, real-time program completion detection - no timer dependencies |
| Internal Address/Data Latching | Latches full 256-byte sector data at microprocessor speed - frees address/data bus for concurrent operations during programming |
| Green Packaging | Pb/Halide-free PLCC-32 package - complies with RoHS Directive 2011/65/EU and JEDEC standards |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code |
|---|---|
|
Use Scenario: Storing firmware and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing fast, reliable code execution and field-upgradable firmware via RS-485 or CAN interfaces. Use Value: 100 ns read access enables zero-wait-state execution from Flash; sector lockout protects critical startup routines from unintended overwrites during remote updates. |
Use Scenario: Holding certified bootloader and safety-critical initialization code in Class II medical instruments requiring traceable, immutable startup logic. IC Role / Device Role / Timing Role: Secure boot memory with independently lockable 8K upper/lower blocks - ensures only validated firmware loads at power-on reset. Use Value: Boot block lockout prevents unauthorized or corrupted firmware execution; 10,000-cycle endurance supports lifetime calibration and regulatory-compliant logging updates. |
| Telecom Base Station Configuration | Automotive Diagnostic Module |
|
Use Scenario: Retaining network configuration profiles, encryption keys, and calibration tables in outdoor telecom equipment operating continuously at –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade parallel Flash interfaced directly to ARM9 or PowerPC processors for deterministic boot and runtime parameter access. Use Value: 50 µA standby current minimizes power draw during idle periods; software protection prevents misconfiguration during OTA updates over Ethernet or LTE backhaul. |
Use Scenario: Storing OBD-II diagnostic firmware and vehicle-specific calibration maps in aftermarket scan tools and ECU reflashing adapters. IC Role / Device Role / Timing Role: In-system reprogrammable Flash enabling safe, verified firmware patches without removing the module from the vehicle harness. Use Value: Sector-based programming allows partial updates without erasing entire memory; DATA polling provides precise timing control for automotive-grade flash programming sequences. |
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 | Same density (2 Mbit), 70 ns read, but uses SST's SuperFlash technology with faster 18 µs sector erase; requires different unlock sequence (0x5555/0x2AA/0x555) | Higher-speed erase improves firmware update latency; lacks dedicated boot-block lockout - requires external software enforcement | Preferred when faster erase time is critical and boot security is managed in firmware rather than hardware. |
| MX29LV200CBTI-70G | 2 Mbit, 70 ns read, supports both 3.3V and 5V operation; includes CFI query mode and hardware reset pin; no boot-block lockout | Broader voltage compatibility eases legacy 5V system integration; lacks hardware-enforced boot protection - increases risk of accidental bootloader corruption | Chosen for mixed-voltage designs where backward compatibility with 5V peripherals is required and boot security is handled externally. |
Compared with AT29LV020-10JU-T, SST39VF200A offers faster erase but weaker boot security, while MX29LV200CBTI adds 5V support at the cost of dedicated lockout - making AT29LV020-10JU-T optimal for 3.3V-only industrial systems needing hardware-gated bootloader integrity.
Availability
AT29LV020-10JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code, telecom base station configuration, and automotive diagnostic modules requiring stable component supply and long-term obsolescence management.
Supply support for AT29LV020-10JU-T 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel Flash products. The company specializes in microcontrollers, analog, Flash memory, and security ICs for industrial, automotive, and consumer markets.
The AT29LV020-10JU-T belongs to Atmel's legacy parallel Flash memory product line, designed specifically for embedded systems requiring in-system reprogrammability, hardware-protected boot code, and industrial temperature resilience without external high-voltage circuitry.
FAQ
What is the maximum read access time specified for the AT29LV020-10JU-T?
The AT29LV020-10JU-T has a maximum read access time of 100 ns under industrial temperature conditions (–40°C to +85°C) and 3.3V supply. This value is guaranteed by the "-10" speed grade suffix and enables direct interface with microcontrollers running at up to 10 MHz without wait states. The AT29LV020-10JU-T datasheet specifies this parameter under tACC and tCE timing conditions with proper load capacitance and signal edge rates.
Does the AT29LV020-10JU-T support 5V-tolerant inputs?
Yes, the AT29LV020-10JU-T supports 5V-tolerant address and control inputs (A0–A17, CE, OE, WE) when operating from a 3.3V supply - inputs may be driven from 0 V to 5.5 V without damage or functional impact. However, I/O0–I/O7 pins are limited to 0–3.6 V and must not exceed VCC + 0.6 V. This tolerance simplifies interface with 5V logic in mixed-signal systems without level shifters.
How does the boot block lockout feature work on the AT29LV020-10JU-T?
The AT29LV020-10JU-T contains two 8K-byte boot blocks - one at the lowest addresses (0x00000–0x01FFF) and one at the highest (0x3E000–0x3FFFF). Each can be independently locked using a seven-command software sequence. Once activated, that block becomes permanently read-only: no erase or program operations are possible. Lock status is verified by reading address 0x00002 (lower block) or 0x3FFF2 (upper block); FFH indicates locked, FEH indicates unlocked. The AT29LV020-10JU-T datasheet details the exact algorithm in Section 25.
Can the AT29LV020-10JU-T be programmed using standard EPROM programmers?
No, the AT29LV020-10JU-T cannot be programmed using conventional EPROM programmers. It requires in-system programming via its parallel interface using specific software command sequences (e.g., unlock code 0x5555/0x2AAA/0xA0 followed by byte loads). Programming is sector-based (256 bytes), not byte-wise, and relies on internal timers and DATA polling. Standard EPROM programmers lack the timing control, command sequencing, and sector management logic needed for AT29LV020-10JU-T.
What is the endurance rating of the AT29LV020-10JU-T, and how is it measured?
The AT29LV020-10JU-T is rated for >10,000 program/erase cycles per sector, as confirmed by Atmel's qualification testing across the full industrial temperature range. Endurance is measured per JEDEC standard JESD22-A117, with cycling applied to individual 256-byte sectors while monitoring data retention and read/write functionality. This rating applies to each sector independently - writing to one sector does not degrade others. The AT29LV020-10JU-T datasheet lists this in Section 1, "Features", and Section 6, "DC and AC Operating Range".
AT29LV020-10JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 100 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)
AT29LV020-10JU-T FAQ
1.How can I place an order for AT29LV020-10JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV020-10JU-T 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 AT29LV020-10JU-T reliable?
The price and inventory of AT29LV020-10JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV020-10JU-T is usually 5 days.
3.What payment methods are accepted for AT29LV020-10JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV020-10JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV020-10JU-T?
AT29LV020-10JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV020-10JU-T 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 AT29LV020-10JU-T?
For technical support, including AT29LV020-10JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV020-10JU-T requirements.
6.How does Aetrix verify that AT29LV020-10JU-T is sourced from the original manufacturer or authorized distributors?
All AT29LV020-10JU-T 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 AT29LV020-10JU-T meets industry standards.
7.What is the process for return or replacement of AT29LV020-10JU-T?
All AT29LV020-10JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV020-10JU-T, 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 AT29LV020-10JU-T part is unused and in its original packaging.
Return procedure for AT29LV020-10JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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