My Inquiry
My Account
Microchip Technology AT29LV020-25JI
- Part No.:
- AT29LV020-25JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV020-25JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT29LV020-25JI from Atmel is a 2-Mbit (256K × 8) 3.3V-only Flash memory IC organized as 262,144 bytes × 8 bits, featuring 100 ns read access time, 20 ms sector program cycle, 10,000 write/erase endurance, and dual 8K-byte boot blocks with independent programming lockout. It operates across industrial temperature range (−40°C to +85°C) and supports in-system reprogramming via software data protection.
For engineers reviewing the AT29LV020-25JI datasheet, AT29LV020-25JI pinout, AT29LV020-25JI application, or AT29LV020-25JI equivalent, key selection considerations include sector-based erase architecture, DATA polling and toggle-bit status detection, PLCC-32 packaging, 3.3V-only operation, and boot-block lockout for secure firmware storage in embedded controllers and legacy BIOS systems.
Technical Context
The AT29LV020-25JI implements a sector-erase Flash architecture with 1024 × 256-byte sectors, internal address/data latches for full-sector loading, and automatic erase-before-program sequencing. Its software data protection requires a three-byte command sequence (AAh/55h/A0h) prior to any byte load, preventing inadvertent writes during power transitions or noise events.
Hardware protection includes VCC sense (<1.8V inhibit), 10 ms power-on delay, OE/CE/WE control-line gating, and 15 ns noise filtering on WE/CE inputs. Input levels tolerate 0–5.5V on address/control pins and 0–3.6V on I/O lines while operating at 3.3V ±10%, enabling mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling compact firmware storage without external expansion |
| Read Access Time | 250 ns max - defines maximum wait-state latency for CPU read cycles |
| Sector Program Time | 20 ms typical - determines minimum firmware update duration per 256-byte sector |
| Endurance | >10,000 program/erase cycles per sector - supports field-upgradable embedded applications |
| Supply Voltage | 3.3V ±0.3V - mandates dedicated 3.3V rail; not 5V-tolerant for core operation |
| Standby Current | 50 µA max (industrial temp) - enables low-power retention in battery-backed systems |
| Operating Temp | −40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure |
Pinout & Package
AT29LV020-25JI is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC-32), JEDEC MS-016 compliant, with 1.27 mm pitch, 12.45 mm × 14.95 mm body, and pin 1 identifier notch. Pin layout supports standard 8-bit parallel bus interface with no external high-voltage programming circuitry required.
| 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 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input; CMOS/TTL compatible |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output control; disables I/O drivers when high to prevent bus contention |
| WE | Write Enable | Active-low write strobe; initiates byte load during sector programming when CE is low |
| VCC | Power Supply | +3.3V core supply; device inhibits programming if VCC drops below ~1.8V |
| GND | Ground | Reference return path for all signals and power; decoupling required near pin |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid reliability risk |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before each sector program, eliminating need for hardware write-protect jumpers |
| Boot Block Lockout | Two independent 8K-byte blocks (lowest and highest addresses) can be permanently write-locked to protect bootloader code from corruption |
| Status Detection | DATA polling on I/O7 and toggle-bit monitoring on I/O6 provide real-time program completion feedback without external timers |
| Single-Cycle Reprogram | Internal erase-and-program automation eliminates separate erase command step, reducing firmware update complexity |
| Input Voltage Tolerance | Address and control inputs accept 0–5.5V logic levels while powered at 3.3V, easing integration with 5V microcontrollers |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing configuration logic and motion control algorithms in programmable logic controllers subject to frequent field updates. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level reprogrammability and boot-block lockout to preserve startup routines. Use Value: Enables safe in-field firmware upgrades without removing the module; 10,000-cycle endurance supports multi-year maintenance cycles. | Use Scenario: Holding BIOS code in older x86-based industrial motherboards where socketed Flash is required for recovery and customization. IC Role / Device Role / Timing Role: Direct replacement for EPROM-based BIOS chips using standard 8-bit parallel bus timing and 250 ns access window. Use Value: Eliminates UV-eraser dependency and high-voltage programmers; supports hot-swap BIOS updates via standard ISA/LPC interface. |
| Telecom Line Card Bootloader | Automotive Body Control Module |
Use Scenario: Hosting boot code and calibration tables in carrier-grade DSLAM line cards operating in temperature-controlled cabinets. IC Role / Device Role / Timing Role: Secure boot memory with locked lower 8K block ensuring verified startup execution before loading application firmware. Use Value: Prevents unauthorized modification of boot sequence; industrial temp rating ensures stability under sustained 60°C ambient conditions. | Use Scenario: Storing vehicle-specific configuration parameters and diagnostic routines in door module ECUs exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Field-updatable nonvolatile memory interfaced to 8-bit microcontroller buses with strict EMC immunity requirements. Use Value: Withstands automotive transients and thermal shock; 50 µA standby current extends battery life during vehicle sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV020C-25J1I | Same density, 250 ns access, PLCC-32, but uses different unlock sequence (AAh/55h/80h) and lacks boot-block lockout | Requires modified firmware loader; unsuitable where bootloader integrity is enforced by hardware lockout | Select only if existing software already supports Macronix command set and boot protection is handled externally |
| EN29LV020-25JIP | Identical pinout and timing, but specifies 30 ms max sector program time vs. 20 ms typical for AT29LV020-25JI | May increase firmware update latency in time-critical applications requiring guaranteed sub-25 ms sector writes | Acceptable for non-real-time updates; verify system timeout margins accommodate worst-case 30 ms programming window |
Compared with MX29LV020C-25J1I and EN29LV020-25JIP, the AT29LV020-25JI offers unique boot-block lockout for tamper-resistant bootloader storage and faster typical sector programming (20 ms), making it preferred for safety-critical or time-constrained embedded firmware updates.
Availability
AT29LV020-25JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, telecom line card bootloader, and automotive body control module applications requiring stable component supply and long-lifecycle support.
Supply support for AT29LV020-25JI 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, Flash memory, and secure authentication ICs.
The AT29LV020 product line was designed for cost-sensitive, in-system programmable firmware storage in industrial, telecom, and computing applications where socketed Flash replacement of EPROMs was required.
FAQ
What is the maximum operating temperature range for the AT29LV020-25JI?
The AT29LV020-25JI 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 datasheet (Rev. 0565C), where the "-25JI" suffix explicitly denotes the industrial grade variant. The device maintains full functionality-including 250 ns read access and 20 ms sector programming-across this entire range.
Does the AT29LV020-25JI require high-voltage programming signals?
No, the AT29LV020-25JI does not require high-voltage programming signals. It operates exclusively from a 3.3V supply (3.0V to 3.6V) for both read and write operations. Programming is enabled solely through a software data protection sequence (AAh/55h/A0h) applied to standard address/data bus lines-no external 12V or 5V programming voltage is needed, simplifying system design and eliminating HV circuitry.
How many sectors does the AT29LV020-25JI have, and what is the size of each sector?
The AT29LV020-25JI contains 1024 sectors, each exactly 256 bytes in size. This is explicitly stated in the "Features" section and reinforced in the "Device Operation" description: "1024 individual sectors, each 256 bytes." Sector addressing uses A8–A17, while A0–A7 select the byte within the sector, enabling precise, granular firmware updates without erasing unrelated memory regions.
Can the AT29LV020-25JI be used as a direct replacement for a 5V EPROM like the 27C020?
The AT29LV020-25JI is not a pin-compatible or voltage-compatible drop-in replacement for the 5V 27C020 EPROM. While both are 32-pin PLCC devices with similar pin functions, the AT29LV020-25JI requires 3.3V operation and uses software-controlled sector programming instead of UV erasure. Interfacing requires level-shifting for control signals and firmware adaptation to the unlock sequence and status polling-hardware and software changes are necessary.
What happens to data in an unloaded sector during programming of the AT29LV020-25JI?
During sector programming of the AT29LV020-25JI, any byte within the 256-byte sector that is not explicitly loaded will be erased to FFh (all bits high). This behavior is documented in the "Software Data Protection Programming" section: "Any byte that is not loaded during the programming of its sector will be erased to read FFH." Full sector loading is mandatory to preserve intended data values.
AT29LV020-25JI 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:
- 250 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)
AT29LV020-25JI FAQ
1.How can I place an order for AT29LV020-25JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV020-25JI 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 AT29LV020-25JI reliable?
The price and inventory of AT29LV020-25JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV020-25JI is usually 5 days.
3.What payment methods are accepted for AT29LV020-25JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV020-25JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV020-25JI?
AT29LV020-25JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV020-25JI 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 AT29LV020-25JI?
For technical support, including AT29LV020-25JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV020-25JI requirements.
6.How does Aetrix verify that AT29LV020-25JI is sourced from the original manufacturer or authorized distributors?
All AT29LV020-25JI 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 AT29LV020-25JI meets industry standards.
7.What is the process for return or replacement of AT29LV020-25JI?
All AT29LV020-25JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV020-25JI, 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 AT29LV020-25JI part is unused and in its original packaging.
Return procedure for AT29LV020-25JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV020-25JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
