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Microchip Technology AT29BV020-12JC
- Part No.:
- AT29BV020-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29BV020-12JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,214
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Product details
Overview
AT29BV020-12JC from Atmel is a 2.7V-only, 2 Mbit (256K × 8) Flash memory IC designed for in-system reprogrammability in embedded boot code storage. It features 120 ns read access time, 1024 × 256-byte sectors, software data protection, and dual 8K-byte boot blocks with independent programming lockout - used in industrial controllers for firmware storage and recovery.
For engineers reviewing the AT29BV020-12JC datasheet, AT29BV020-12JC pinout, AT29BV020-12JC application, or AT29BV020-12JC equivalent, key selection criteria include sector-based reprogramming timing (20 ms max), CMOS standby current (40 µA), boot block lockout behavior, and PLCC-32 package compatibility with legacy 5V-tolerant control logic.
Technical Context
The AT29BV020-12JC implements sector-erase-and-program architecture with internal address/data latches for 256-byte loads, eliminating external buffering during reprogramming. Its software data protection requires a three-byte command sequence (AAh/55h/A0h) before any sector write, and hardware safeguards include VCC sense (<2.0V inhibit), noise filtering (<15 ns pulse rejection), and CE/OE/WE-controlled program inhibition.
Boot block lockout is implemented via a seven-command enable algorithm targeting addresses 00000H (lower) or 3FFFFH (upper); once activated, chip erase is disabled and the locked 8K-byte region becomes immutable. Data polling (I/O7 complement) and toggle bit (I/O6 toggling) provide real-time program cycle status without requiring external timers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 120 ns (max) - enables direct execution from flash in systems with ≤8.3 MHz bus timing. |
| Supply Voltage | 2.7V to 3.6V single supply - eliminates need for charge pumps or dual-rail regulators in battery-powered designs. |
| Active Current | 15 mA at 5 MHz / 3.6V - defines power budget for active firmware reads during system boot or updates. |
| Standby Current | 40 µA (CMOS, commercial temp) - ensures low quiescent draw during extended sleep modes in industrial sensors. |
| Endurance | >10,000 program/erase cycles per sector - supports field firmware updates over 5+ years in deployed equipment. |
| Sector Size | 256 bytes × 1024 sectors - aligns with typical bootloader partitioning schemes and minimizes rewrite overhead. |
Pinout & Package
AT29BV020-12JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016 Variation AE, with 1.27 mm pitch and 12.45 mm × 14.95 mm body dimensions. Pin 1 identifier is a corner notch on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A7 select byte within 256-byte sector during programming. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with TTL/CMOS logic; I/O7 provides DATA polling status, I/O6 provides toggle-bit status. |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high state forces outputs to high-Z and disables internal operations. |
| 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; controls byte loading during sector programming; must be high for read mode. |
| VCC | Power Supply | 2.7–3.6V main supply; internal voltage sensing disables programming if VCC drops below ~2.0V. |
| GND | Ground | Reference for all inputs/outputs; decoupling capacitor required near pin 20 per layout guidelines. |
| NC | No Connect | Pin 13 (PLCC top view) is unconnected - must remain floating; not usable as spare I/O or ground. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every sector program - prevents accidental writes during power transients or noise events. |
| Dual Boot Block Lockout | Independent 8K-byte lockout for lower (0x0000–0x1FFF) and upper (0x3E000–0x3FFFF) regions - secures bootloader and recovery firmware against corruption. |
| Internal Sector Erase | Automatic erase before programming - eliminates separate erase command and simplifies host firmware logic. |
| Data Polling & Toggle Bit | Real-time program completion detection via I/O7 (complement read) or I/O6 (toggle) - removes need for fixed-delay timing loops in host drivers. |
| 256-Byte Internal Latch | Latches full sector data at microprocessor speed before internal programming - frees address/data bus for other tasks during 20 ms write cycle. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
|
Use Scenario: Storing and updating firmware in programmable logic controllers operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding primary application code and fail-safe recovery routines; accessed at power-on reset and during field upgrades. Use Value: 40 µA standby current extends backup battery life during mains failure; sector lockout prevents corruption of critical safety firmware during partial updates. |
Use Scenario: Securing boot code and calibration data in portable diagnostic instruments requiring FDA-compliant firmware integrity. IC Role / Device Role / Timing Role: Trusted boot source verified at startup; stores signed bootloader and encrypted configuration parameters. Use Value: Dual boot blocks allow A/B firmware partitioning; >10,000 endurance supports lifetime recalibration cycles without replacement. |
| Automotive Body Control Module | Telecom Remote Terminal |
|
Use Scenario: Holding configuration tables and driver binaries in vehicle door modules exposed to -40°C to +85°C ambient conditions. IC Role / Device Role / Timing Role: In-system programmable flash for ECU parameter tuning and regional feature activation via dealer tools. Use Value: Industrial temperature rating (-40°C to +85°C) ensures reliability under hood conditions; 120 ns access enables fast CAN message processing startup. |
Use Scenario: Storing protocol stacks and field-upgradable DSP firmware in outdoor DSLAM line cards with limited board space. IC Role / Device Role / Timing Role: Compact, low-power firmware repository interfacing directly with 8-bit microcontroller buses. Use Value: PLCC-32 package allows socketed replacement in field; 2.7V operation reduces dependency on point-of-load regulators. |
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, 3.3V-only, 48-pin TSOP; no boot block lockout; 100,000 endurance cycles | Lacks hardware-enforced boot protection; higher speed but larger footprint and no PLCC option | Choose when faster read performance is prioritized over secure boot partitioning and socketed serviceability. |
| MX29LV200CTTI-70G | 70 ns access, 3.0–3.6V, 48-pin TSOP; includes CFI query support; 100K endurance; no dedicated boot lockout | CFI compliance simplifies auto-detection in generic programmers; lacks independent boot block locking | Prefer for systems using standardized flash programming infrastructure where boot security is handled in software. |
Compared with SST39VF200A-70-4C-NHE and MX29LV200CTTI-70G, the AT29BV020-12JC offers unique dual boot block lockout in PLCC-32, enabling hardware-enforced firmware partitioning - critical for safety-critical updates where physical replacement and tamper resistance matter more than raw speed.
Availability
AT29BV020-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader retention, and automotive body control module configuration requiring stable component supply across extended product lifecycles.
Supply support for AT29BV020-12JC 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 ICs.
The AT29BV020 belongs to Atmel's Battery-Voltage™ Flash family, engineered for reliable in-system reprogramming in space-constrained, low-voltage embedded systems where firmware integrity and field upgradeability are essential.
FAQ
What is the maximum operating temperature range for the AT29BV020-12JC?
The AT29BV020-12JC is rated for commercial temperature operation from 0°C to +70°C. Its PLCC-32 package and internal design meet this specification with guaranteed 120 ns read access and 40 µA standby current across the full range. This makes the AT29BV020-12JC suitable for office and lab equipment but not for under-hood automotive use - for that, the industrial-grade AT29BV020-12JI variant is required.
Does the AT29BV020-12JC support true 5V-tolerant inputs?
Yes - the AT29BV020-12JC accepts input voltages up to 5.5V on address and control pins (A0–A17, CE, OE, WE) while operating from a 2.7–3.6V VCC supply. This allows direct interfacing with legacy 5V microcontrollers without level shifters. However, I/O lines are limited to 0–VCC+0.6V, so 5V signals must not be driven onto I/O0–I/O7.
How does the boot block lockout feature work on the AT29BV020-12JC?
The AT29BV020-12JC contains two 8K-byte boot blocks - one at the lowest addresses (0x0000–0x1FFF) and one at the highest (0x3E000–0x3FFFF). Lockout is enabled via a seven-command software sequence; once set, those blocks become permanently read-only. The AT29BV020-12JC retains this state even after power cycling, and chip erase is disabled if either block is locked.
Can the AT29BV020-12JC be programmed using standard EPROM programmers?
No - the AT29BV020-12JC requires in-system programming via its parallel interface and specific software command sequences (e.g., AAh/55h/A0h unlock). It lacks the high-voltage VPP pin used by traditional EPROM programmers. Programming must be performed with CE/OE/WE control and proper timing (e.g., tWP ≥ 200 ns), making it incompatible with legacy EPROM burners unless they support Flash-specific algorithms.
What is the purpose of the NC pin on the AT29BV020-12JC PLCC package?
Pin 13 on the AT29BV020-12JC PLCC-32 package is designated NC (No Connect) and must remain unconnected - it is not bonded internally and serves no electrical function. Routing traces to or from this pin may cause mechanical stress or contamination risks during reflow. The AT29BV020-12JC datasheet explicitly prohibits using NC as ground, power, or signal; doing so violates JEDEC MS-016 compliance.
AT29BV020-12JC 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29BV020-12JC FAQ
1.How can I place an order for AT29BV020-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV020-12JC 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 AT29BV020-12JC reliable?
The price and inventory of AT29BV020-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV020-12JC is usually 5 days.
3.What payment methods are accepted for AT29BV020-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV020-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV020-12JC?
AT29BV020-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV020-12JC 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 AT29BV020-12JC?
For technical support, including AT29BV020-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV020-12JC requirements.
6.How does Aetrix verify that AT29BV020-12JC is sourced from the original manufacturer or authorized distributors?
All AT29BV020-12JC 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 AT29BV020-12JC meets industry standards.
7.What is the process for return or replacement of AT29BV020-12JC?
All AT29BV020-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV020-12JC, 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 AT29BV020-12JC part is unused and in its original packaging.
Return procedure for AT29BV020-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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