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Microchip Technology AT29BV020-12JI
- Part No.:
- AT29BV020-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29BV020-12JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
AT29BV020-12JI from Atmel is a 2.7V-only, 2 Mbit (256K × 8) in-system Flash memory IC used for nonvolatile program/data storage in embedded controllers and boot code applications. It features 120 ns read access time, 1024 sectors of 256 bytes each, software data protection, and two 8K-byte boot blocks with independent lockout. Designed for industrial temperature range (−40°C to +85°C), it supports single-cycle sector erase-and-program operations.
For engineers reviewing the AT29BV020-12JI datasheet, AT29BV020-12JI pinout, AT29BV020-12JI application, or AT29BV020-12JI equivalent, key selection considerations include its 2.7–3.6 V single-supply operation, CMOS standby current <50 µA, sector-based reprogrammability, boot block lockout capability, and PLCC-32 packaging for legacy industrial PCBs.
Technical Context
The AT29BV020-12JI implements a sector-erasable Flash architecture with internal address/data latches for 256-byte loads and automatic erase-before-program sequencing. Its software data protection requires a three-byte command sequence (AAh/55h/A0h) to enable programming, preventing inadvertent writes during power transitions or noise events.
It supports dual-mode product identification (hardware and software), DATA polling on I/O7 and toggle-bit detection on I/O6 for end-of-program indication, and optional chip-erase via 6-byte software code. Boot block lockout is activated by a 7-command algorithm and disables chip erase when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - defines maximum firmware/image size supportable without external banking logic. |
| Read Access Time | 120 ns max - enables direct interface with 8-bit microcontrollers running at ≤8 MHz without wait states. |
| Supply Voltage | 2.7 V to 3.6 V - allows direct connection to 3.3 V system rails without level-shifting or auxiliary regulators. |
| Active Current | 15 mA typical at 5 MHz - determines peak power budget impact during firmware reads or sector verification. |
| Standby Current | 50 µA max (industrial temp) - ensures low quiescent draw in sleep-mode systems like remote sensors or battery-backed controllers. |
| Sector Size | 256 bytes × 1024 sectors - defines minimum granularity for field updates and wear-leveling partitioning. |
| Endurance | >10,000 program/erase cycles per sector - supports infrequent firmware upgrades over 10+ year industrial deployments. |
Pinout & Package
AT29BV020-12JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016 Variation AE. Dimensions: 12.45 mm × 14.95 mm × 3.35 mm (max height), lead pitch 1.27 mm, coplanarity ≤0.102 mm.
| 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 for read data output and program data input; supports DATA polling (I/O7) and toggle-bit detection (I/O6). |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high forces outputs to high-impedance and inhibits all writes. |
| OE | Output Enable | Active-low read control; used with CE to prevent bus contention; must be high during programming. |
| WE | Write Enable | Active-low write strobe; controls latching of address/data during byte load; low pulse initiates sector programming after software unlock. |
| VCC | Power Supply | 2.7–3.6 V main supply; includes internal VCC sense circuitry that inhibits programming if voltage drops below ~2.0 V. |
| GND | Ground Reference | Signal and power ground reference; required for stable read/write timing and noise immunity. |
| NC | No Connect | Pin 13 (PLCC top view) is unconnected; must remain floating - no routing or grounding permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6 V Supply Operation | Eliminates need for high-voltage programming circuitry or charge pumps - simplifies board design and reduces BOM count. |
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) prevents accidental writes during power-up, reset, or EMI events - critical for field-deployed firmware integrity. |
| Two Independent Boot Blocks | 8K-byte lower and upper memory regions with programmable lockout - enables secure bootloader storage immune to overwrite during application updates. |
| Internal Sector Erase-and-Program Timer | Automated erase-before-write eliminates external timing control; max 20 ms sector program cycle - predictable update latency for host firmware. |
| DATA Polling & Toggle-Bit Detection | Real-time status feedback via I/O7 complement or I/O6 toggling - allows host CPU to poll instead of fixed delays, improving system responsiveness. |
| CMOS/TTL Input Compatibility | Input thresholds (VIL ≤0.6 V, VIH ≥2.0 V) and 0–5.5 V tolerant address/control pins - permits direct interfacing with 5 V microcontrollers without level shifters. |
Applications
| Industrial PLC Firmware Storage | Embedded Controller Boot Code |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating in harsh factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding startup routines and ladder logic images; accessed at power-on reset and during online firmware updates. Use Value: Industrial temperature rating (−40°C to +85°C), 10,000-cycle endurance, and hardware/software write protection ensure reliable long-term operation without corruption. |
Use Scenario: Hosting boot code for 8-bit microcontrollers in medical diagnostic devices requiring certified, tamper-resistant startup sequences. IC Role / Device Role / Timing Role: Primary boot ROM providing verified initialization code before loading application firmware from external media. Use Value: Dual boot blocks with independent lockout allow separation of secure bootloader (locked) from updatable application image (unlocked), meeting IEC 62304 safety requirements. |
| Legacy Industrial HMI Display | Telecom Line Card Configuration |
Use Scenario: Storing display fonts, UI bitmaps, and calibration tables in human-machine interface panels using aging 8-bit MCUs and PLCC-footprint PCBs. IC Role / Device Role / Timing Role: Parallel-memory-mapped storage accessed via standard EPROM-style read cycles; supports 120 ns access for real-time UI rendering. Use Value: PLCC-32 package matches legacy board layouts; 2.7–3.6 V operation aligns with 3.3 V system rails; sector programming enables partial UI updates without full reflash. |
Use Scenario: Holding line-specific configuration parameters (e.g., gain settings, protocol profiles) in carrier-grade DSLAM line cards requiring field-upgradable settings. IC Role / Device Role / Timing Role: Parameter EEPROM replacement offering higher density and faster sector writes than serial EEPROMs, reducing update time during service calls. Use Value: 256-byte sector granularity allows updating individual line profiles without disturbing others; DATA polling enables deterministic update completion signaling to management CPU. |
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, 3.0–3.6 V supply, 44-pin TSOP package - faster but incompatible pinout and voltage range. | Requires PCB redesign for TSOP footprint and tighter VCC regulation; not drop-in for PLCC-32 layouts. | Select only if read speed >120 ns is critical and board revision is feasible. |
| MX29LV200CTTI-70G | 70 ns access, 2.7–3.6 V, 48-pin TSOP - includes CFI query support and wider sector architecture (16 × 8K + 2 × 64K). | Lacks dedicated boot block lockout; CFI compatibility aids auto-detection but adds software overhead. | Prefer for new designs needing standardized Flash interfaces; not suitable for AT29BV020-12JI's lockout-dependent security model. |
Compared with SST39VF200A-70-4C-NHE and MX29LV200CTTI-70G, the AT29BV020-12JI uniquely delivers industrial-temp PLCC-32 packaging, hardware-enforced boot block lockout, and proven 10,000-cycle reliability in legacy 8-bit systems - making it irreplaceable where mechanical fit, security partitioning, and long-lifecycle continuity are mandatory.
Availability
AT29BV020-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded controller boot code, and legacy HMI display applications requiring stable component supply across extended product lifecycles.
Supply support for AT29BV020-12JI 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, Flash memory, and secure authentication ICs.
The AT29BV020-12JI belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for low-voltage, in-system programmable nonvolatile storage in space-constrained and power-sensitive industrial and automotive control systems.
FAQ
What is the operating temperature range for the AT29BV020-12JI?
The AT29BV020-12JI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table and DC Operating Range section of the datasheet. The "I" suffix in the part number explicitly denotes industrial grade, distinguishing it from commercial-grade variants like AT29BV020-12JC. This range ensures reliable performance in factory automation, outdoor telecom equipment, and transportation control systems.
Does the AT29BV020-12JI require high-voltage programming signals?
No, the AT29BV020-12JI operates exclusively from a single 2.7 V to 3.6 V supply for both read and program operations. It does not require external 12 V programming voltages. Internal circuitry handles sector erase and program timing, and software data protection replaces hardware high-voltage enable sequences. This eliminates the need for charge pumps or external HV generators, simplifying system design around the AT29BV020-12JI.
How is boot block lockout enabled on the AT29BV020-12JI?
Boot block lockout on the AT29BV020-12JI is enabled via a seven-command software algorithm: AAh to 5555h, 55h to 2AAAh, 80h to 5555h, AAh to 5555h, 55h to 2AAAh, 40h to 5555h, then 00h to 00000h (lower block) or FFh to 3FFFFh (upper block). Once activated, the corresponding 8K-byte boot block becomes permanently read-only, and chip erase is disabled - a key security feature documented in the Boot Block Lockout Feature Enable Algorithm section.
Can the AT29BV020-12JI be used with a 5 V microcontroller interface?
Yes, the AT29BV020-12JI supports 0–5.5 V tolerant address and control inputs (A0–A17, CE, OE, WE), allowing direct connection to 5 V logic without level shifters. However, I/O lines are limited to 0–VCC+0.6 V, so with VCC = 3.3 V, I/O swing is 0–3.9 V - compatible with 5 V-tolerant MCU inputs but requiring careful attention to output drive strength and termination. This interoperability is explicitly stated under INPUT LEVELS in the datasheet.
What methods detect program completion on the AT29BV020-12JI?
The AT29BV020-12JI provides two hardware-supported methods: DATA polling on I/O7 (complement of loaded data during programming, true data upon completion) and toggle-bit detection on I/O6 (toggling between 0/1 during programming, steady state upon completion). Both methods allow the host processor to poll asynchronously without fixed delays. These mechanisms are detailed in the DATA POLLING and TOGGLE BIT sections and are integral to robust firmware update routines for the AT29BV020-12JI.
AT29BV020-12JI 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29BV020-12JI FAQ
1.How can I place an order for AT29BV020-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV020-12JI 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 AT29BV020-12JI reliable?
The price and inventory of AT29BV020-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV020-12JI is usually 5 days.
3.What payment methods are accepted for AT29BV020-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV020-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV020-12JI?
AT29BV020-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV020-12JI 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 AT29BV020-12JI?
For technical support, including AT29BV020-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV020-12JI requirements.
6.How does Aetrix verify that AT29BV020-12JI is sourced from the original manufacturer or authorized distributors?
All AT29BV020-12JI 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 AT29BV020-12JI meets industry standards.
7.What is the process for return or replacement of AT29BV020-12JI?
All AT29BV020-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV020-12JI, 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 AT29BV020-12JI part is unused and in its original packaging.
Return procedure for AT29BV020-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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