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Microchip Technology AT29LV020-25JC
- Part No.:
- AT29LV020-25JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV020-25JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,319
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Product details
Overview
AT29LV020-25JC from Atmel is a 2-Mbit (256K × 8) 3.3V-only Flash memory IC organized as 262,144 bytes by 8 bits, featuring 100 ns read access time, 20 ms sector program cycle time, and software data protection. It supports in-system reprogramming via sector erase-and-program operations and includes two 8K-byte boot blocks with independent programming lockout-used in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT29LV020-25JC datasheet, AT29LV020-25JC pinout, AT29LV020-25JC application, or AT29LV020-25JC equivalent, key selection criteria include 3.3V-only operation, PLCC-32 packaging, 10,000-cycle endurance, DATA polling/Toggle Bit program status detection, and boot block lockout for secure firmware boot code protection.
Technical Context
The AT29LV020-25JC implements sector-based flash architecture with 1024 × 256-byte sectors, internal address/data latches for full-sector loading, and automatic erase-before-program logic. Its software data protection requires a three-byte command sequence (AAh→55h→A0h) to enable byte loads, 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 ± 0.3V, enabling mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), directly replaces EPROMs in legacy 8-bit microcontroller systems |
| Read Access Time | 250 ns max - defines minimum bus cycle timing for 8051/Z80-compatible systems |
| Sector Program Time | 20 ms typical - enables field firmware updates without external high-voltage programming hardware |
| Endurance | >10,000 write/erase cycles per sector - supports infrequent but critical firmware revisions over product lifetime |
| Standby Current | 40 µA (CMOS) - allows low-power sleep modes in battery-backed industrial controllers |
| Operating Voltage | 3.3V ± 0.3V - eliminates need for 5V supply rails in modern 3.3V system designs |
| Temperature Range | 0°C to +70°C - qualified for commercial-grade embedded applications including POS terminals and test equipment |
Pinout & Package
AT29LV020-25JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016 Variation AE, with body dimensions 12.45 mm × 14.95 mm × 3.35 mm (max height) and lead coplanarity ≤ 0.102 mm.
| 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 |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit CMOS/TTL-compatible data path; supports DATA polling on I/O7 and Toggle Bit on I/O6 during programming |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; inhibits programming if held high |
| OE | Output Enable | Active-low output control; high-Z state prevents bus contention when disabled; required high during programming |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data during byte load; must be low with CE low and OE high for programming |
| NC | No Connect | Pin 16 (PLCC top view); no internal connection - must remain unconnected on PCB |
| VCC | Power Supply | +3.3V supply input; voltage sense circuitry disables programming if below 1.8V |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h→2AAAh→5555h) required before any sector programming - prevents accidental firmware corruption |
| Boot Block Lockout | Two independent 8K-byte blocks (first/last 8K) support permanent write-protection - secures bootloader code against overwrite |
| DATA Polling & Toggle Bit | I/O7 complement feedback and I/O6 toggling provide real-time program status without external timers or interrupts |
| Single-Cycle Sector Erase/Program | Internal timer automates full sector erase followed by simultaneous 256-byte programming - simplifies host firmware driver design |
| 3.3V-Only Operation | No 5V or 12V programming voltages needed - eliminates level-shifting and high-voltage generation circuitry |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing configuration and control logic firmware in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into microcontroller address space; accessed via standard parallel bus with 250 ns read timing. Use Value: Boot block lockout prevents unauthorized modification of safety-critical startup routines, while 10,000-cycle endurance supports field firmware patches over 10+ year service life. |
Use Scenario: Replacing obsolete 27C020 EPROMs in desktop motherboard BIOS chips requiring in-circuit reprogrammability. IC Role / Device Role / Timing Role: Parallel-interface Flash ROM providing XIP (execute-in-place) code execution during POST; supports JEDEC-standard software ID commands. Use Value: 3.3V-only operation eliminates need for 12V programming adapters; DATA polling enables reliable BIOS update routines without external status monitoring hardware. |
| Embedded Test Equipment Code | Point-of-Sale Terminal Bootloader |
Use Scenario: Holding calibration routines and self-test firmware in handheld multimeters and oscilloscope front-ends. IC Role / Device Role / Timing Role: Standalone firmware storage with direct CPU bus interface; operates in commercial temperature range with low standby current. Use Value: 40 µA CMOS standby current extends battery life in portable instruments; sector programming allows incremental feature updates without full device erasure. |
Use Scenario: Securing boot code in retail payment terminals where tamper resistance and firmware integrity are regulatory requirements. IC Role / Device Role / Timing Role: Protected boot memory with lockout-enabled lower 8K block storing verified bootloader; accessed during cold reset initialization. Use Value: Independent boot block lockout ensures bootloader remains immutable even if application firmware is remotely updated, meeting PCI PTS security mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020B-250EC | 250 ns read access, 32-pin TSOP package, same 2 Mbit density and 3.3V operation | Lacks boot block lockout; uses different software unlock sequence (AAh→55h→A0h vs. AAh→55h→F0h) | Select when board layout uses TSOP-32 and boot protection is not required |
| SST39VF200A-25-4C-NHE | 250 ns read, 32-pin TSOP, 2 Mbit density, supports both word and byte programming modes | Uses different command set (5555h→2AAAh→5555h→2AAAh→20h); no dedicated boot blocks | Choose for compatibility with SuperFlash-based toolchains and higher 100K-cycle endurance |
Compared with AM29LV020B-250EC and SST39VF200A-25-4C-NHE, the AT29LV020-25JC uniquely provides dual independent boot block lockout and PLCC-32 packaging - critical for legacy industrial PCBs requiring mechanical robustness and firmware partitioning.
Availability
AT29LV020-25JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, and embedded test equipment code requiring stable component supply across extended product lifecycles.
Supply support for AT29LV020-25JC 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, nonvolatile memory, and secure authentication devices.
The AT29LV020-25JC belongs to Atmel's LV-series Flash memory product line, designed specifically for 3.3V embedded systems requiring in-system programmability, sector-level erase granularity, and boot code protection in legacy parallel-bus architectures.
FAQ
What is the maximum read access time specified for the AT29LV020-25JC?
The AT29LV020-25JC has a maximum read access time of 250 ns, as indicated by the "-25" suffix in its part number. This parameter defines the worst-case delay from address stabilization and CE/OE assertion to valid data appearing on I/O0–I/O7. The value is guaranteed across the commercial temperature range (0°C to +70°C) and at VCC = 3.3V ± 0.3V. This timing aligns with legacy 8-bit microprocessor bus cycles and replaces older 27C020 EPROMs in existing designs.
Does the AT29LV020-25JC require high-voltage programming signals?
No, the AT29LV020-25JC operates with 3.3V-only programming - no 5V, 12V, or other high-voltage signals are required. Programming is enabled solely through a software command sequence applied to the standard address/data bus. The internal charge pump generates necessary voltages, allowing in-system reprogramming using only the existing 3.3V supply rail. This eliminates external high-voltage generators and simplifies PCB design for the AT29LV020-25JC.
How does boot block lockout work on the AT29LV020-25JC?
The AT29LV020-25JC features two independent 8K-byte boot blocks - one at the lowest addresses (0x00000–0x01FFF) and one at the highest (0x3E000–0x3FFFF). Each can be permanently locked via a seven-command software sequence. Once activated, that block becomes read-only: no erase or program operations are possible. Lockout status is verified by reading address 0x00002 (lower block) or 0x3FFF2 (upper block); FEh means unlocked, FFh means locked. This protects bootloader code in the AT29LV020-25JC from accidental overwrite.
Can the AT29LV020-25JC be used in systems with 5V-tolerant microcontrollers?
Yes, the AT29LV020-25JC supports mixed-voltage interfacing: its address and control inputs (A0–A17, CE, OE, WE) accept 0–5.5V logic levels while operating from a 3.3V supply, and I/O lines tolerate 0–3.6V. This allows direct connection to 5V-tolerant microcontrollers without level shifters. However, output drive strength and timing margins must be validated per system - the AT29LV020-25JC itself remains a 3.3V device with CMOS/TTL-compatible signaling.
What methods does the AT29LV020-25JC provide to detect program completion?
The AT29LV020-25JC offers two hardware-supported methods: DATA polling and Toggle Bit. During programming, reading the last loaded byte returns the complement of the data on I/O7; when complete, true data appears. Alternatively, I/O6 toggles between 0 and 1 during programming and stops toggling upon completion. Both methods allow the host processor to poll status without timers or interrupts - essential for reliable firmware updates in the AT29LV020-25JC.
AT29LV020-25JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29LV020-25JC FAQ
1.How can I place an order for AT29LV020-25JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV020-25JC 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 AT29LV020-25JC reliable?
The price and inventory of AT29LV020-25JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV020-25JC is usually 5 days.
3.What payment methods are accepted for AT29LV020-25JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV020-25JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV020-25JC?
AT29LV020-25JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV020-25JC 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 AT29LV020-25JC?
For technical support, including AT29LV020-25JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV020-25JC requirements.
6.How does Aetrix verify that AT29LV020-25JC is sourced from the original manufacturer or authorized distributors?
All AT29LV020-25JC 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 AT29LV020-25JC meets industry standards.
7.What is the process for return or replacement of AT29LV020-25JC?
All AT29LV020-25JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV020-25JC, 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 AT29LV020-25JC part is unused and in its original packaging.
Return procedure for AT29LV020-25JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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