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Microchip Technology AT29BV020-12JU
- Part No.:
- AT29BV020-12JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29BV020-12JU.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
AT29BV020-12JU from Atmel is a 2.7V-only, 2 Mbit (256K × 8) in-system Flash PEROM memory IC with 120 ns read access time, sector-based reprogramming (1024 × 256-byte sectors), and dual 8K-byte boot blocks with independent programming lockout - used for firmware storage and boot code retention in embedded microcontroller systems.
For engineers reviewing the AT29BV020-12JU datasheet, AT29BV020-12JU pinout, AT29BV020-12JU application, or AT29BV020-12JU equivalent, key selection considerations include single-supply 2.7–3.6V operation, software data protection programming sequence, DATA polling/toggle bit program status detection, and PLCC-32 packaging compatibility with legacy industrial controller designs.
Technical Context
The AT29BV020-12JU implements sector-erase-and-program architecture with internal address/data latches for 256-byte bursts, automatic erase-before-write, and hardware VCC-sense power-on delay (10 ms typical) to prevent inadvertent writes during power ramp-up. It supports both WE- and CE-controlled byte loading with 150 µs inter-byte timing window.
Its dual boot blocks (first/last 8K bytes) support secure system startup via independent lockout activation using a 7-command software algorithm; once enabled, locked boot sectors become permanently read-only and disable chip-erase functionality. Input tolerance extends to 5.5V on control/address pins while I/O lines remain VCC + 0.6V limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - fits compact firmware images without external address multiplexing. |
| Read Access Time | 120 ns max - enables direct interface with 8-bit microcontrollers running at ≤8 MHz without wait states. |
| Supply Voltage | 2.7V to 3.6V single supply - eliminates need for charge pumps or auxiliary voltage rails in battery-powered systems. |
| Active Current | 15 mA max at 3.6V/5 MHz - supports low-power operation in portable instrumentation and sensor nodes. |
| Standby Current | 50 µA CMOS standby - maintains data integrity during deep sleep modes in energy-constrained applications. |
| Sector Size | 256 bytes per sector - balances granularity for partial updates against overhead of sector management in bootloader logic. |
| Endurance | 10,000 program/erase cycles per sector - sufficient for field firmware upgrades over 5+ years in industrial controllers. |
| Boot Blocks | Two 8K-byte blocks (0x00000–0x01FFF and 0x3E000–0x3FFFF) with independent lockout - isolates critical boot code from accidental overwrite. |
Pinout & Package
AT29BV020-12JU is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), compliant with JEDEC MS-016 Variation AE, with 1.27 mm pitch, 12.32 mm × 14.86 mm body, and 3.18 mm height - suitable for through-hole or surface-mount reflow assembly in industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A7 select byte within sector, A8–A17 select sector. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for read/write operations; TTL/CMOS-compatible with 1.6 mA sink capability. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state - enables multi-device bus sharing. |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention during read cycles. |
| WE | Write Enable | Active-low write strobe; initiates byte load or program cycle when CE is low and OE is high. |
| VCC | Power Supply | 2.7–3.6V primary supply; internal VCC sense circuitry inhibits programming if below 2.0V. |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic. |
| NC | No Connect | Unbonded pin (A12 in PLCC top view); must be left floating - no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle sector reprogram | Erases and programs 256-byte sector in one atomic operation - simplifies firmware update logic and avoids partial-write corruption. |
| Software data protection | Three-command unlock sequence (AAh/55h/A0h) required before each sector program - prevents accidental writes from noise or software glitches. |
| DATA polling & toggle bit | I/O7 complement indicates active programming; I/O6 toggling provides alternate end-of-cycle detection - eliminates need for fixed delays in host firmware. |
| Boot block lockout | Independent enable/disable for lower and upper 8K-byte blocks via 7-command algorithm - secures boot code while allowing application partition updates. |
| Green Pb/Halide-free packaging | RoHS-compliant PLCC-32 package - meets environmental compliance requirements for industrial and medical equipment shipments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile firmware storage device interfaced directly to 8-bit microcontroller address/data bus; provides deterministic 120 ns read latency for real-time scan cycle execution. Use Value: Sector lockout prevents unauthorized modification of safety-critical control routines; 10,000-cycle endurance supports decades of field firmware patches without hardware replacement. | Use Scenario: Holding certified bootloader and diagnostic self-test code in portable ultrasound and infusion pump controllers requiring regulatory traceability and tamper resistance. IC Role / Device Role / Timing Role: Secure boot memory mapped at reset vector; dual boot blocks allow A/B firmware partitioning with independent lockout for FDA 510(k) validation boundaries. Use Value: Software lockout activation ensures boot code immutability post-certification; 50 µA standby current extends battery life between clinical recalibrations. |
| Automotive Body Control Module | Legacy Industrial HMI Display |
Use Scenario: Storing lighting control algorithms and CAN gateway configuration in under-hood BCMs exposed to -40°C to +85°C ambient and load-dump transients. IC Role / Device Role / Timing Role: In-system programmable Flash memory connected to 8051-based MCU; operates reliably across full industrial temp range with VCC sense and noise-filtered WE/CE inputs. Use Value: 2.7–3.6V single supply eliminates level-shifting components; hardware programming inhibition during brown-out prevents corrupted flash during vehicle cranking. | Use Scenario: Replacing obsolete EPROMs in aging human-machine interface panels used in CNC machines and HVAC control panels with long production lifecycles. IC Role / Device Role / Timing Role: Drop-in Flash replacement for 27C256 EPROMs; pin-compatible with standard 32-pin DIP sockets via PLCC-to-DIP adapter boards. Use Value: 120 ns access matches EPROM timing; software data protection replaces UV-erasable security model with electrically controlled write locks. |
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 access time, 3.0–3.6V supply only, no boot block lockout, 100,000-cycle endurance | Lacks independent boot sector protection; requires external write-enable logic for secure updates | Preferred where faster read speed and higher endurance outweigh boot security needs |
| MX29LV200CTTI-70G | 70 ns access, 2.7–3.6V, includes CFI query mode, no software lockout - uses hardware WP# pin | Relies on physical write-protect pin instead of software lockout; incompatible sector size (16K/64K) | Chosen when CFI-compliant toolchain integration is required over boot block granularity |
Compared with AT29BV020-12JU, SST39VF200A offers faster reads and higher endurance but lacks boot block lockout, while MX29LV200CTTI provides CFI support and hardware write protection but requires PCB-level WP# routing and does not replicate the 256-byte sector granularity essential for fine-grained firmware patching.
Availability
AT29BV020-12JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, and legacy HMI display upgrades requiring stable component supply and long-term obsolescence management.
Supply support for AT29BV020-12JU 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 wireless solutions for industrial, automotive, and consumer applications.
The AT29BV020 belongs to Atmel's Low Voltage Flash family, designed specifically for in-system reprogrammability in resource-constrained embedded systems requiring reliable, single-supply Flash memory with sector-level security controls.
FAQ
What is the maximum operating temperature range for the AT29BV020-12JU?
The AT29BV020-12JU is rated for industrial temperature operation from -40°C to +85°C, as confirmed by its ordering code suffix "JU" (PLCC package, Industrial grade). This range is validated across all DC and AC specifications including 120 ns read access time and 15 mA active current, making it suitable for deployment in harsh environments such as factory automation and outdoor control cabinets.
Does the AT29BV020-12JU require high-voltage programming signals?
No, the AT29BV020-12JU operates with a single 2.7V to 3.6V supply for both read and write operations - no external 12V or 5V programming voltages are needed. Programming is initiated via a software command sequence (AAh/55h/A0h) followed by byte loading, leveraging internal charge pumps to generate required tunneling voltages. This eliminates high-voltage circuitry and simplifies system design.
How is program completion detected on the AT29BV020-12JU?
Program completion on the AT29BV020-12JU is detected using either DATA polling (monitoring I/O7 for complement-to-data transition) or the toggle bit method (observing I/O6 toggling state). Both methods are supported simultaneously and can be polled at any time during programming - no fixed timeout is required. The internal timer ensures maximum 20 ms sector program cycle time regardless of bus timing.
Can the boot blocks of the AT29BV020-12JU be unlocked after programming lockout is enabled?
No, the boot block programming lockout feature on the AT29BV020-12JU is irreversible once activated. The 7-command enable algorithm permanently disables erasure and programming for the selected 8K-byte block(s). Reading addresses 00002H (lower block) or 3FFF2H returns FFh to confirm lockout status. This one-way security mechanism ensures boot code integrity in certified systems.
Is the AT29BV020-12JU pin-compatible with standard 27C256 EPROMs?
Yes, the AT29BV020-12JU in PLCC-32 package (JU suffix) maintains identical pinout and electrical interface compatibility with 27C256 EPROMs, including A0–A15, I/O0–I/O7, CE, OE, and WE assignments. Its 256K × 8 organization and 120 ns access time allow direct socket replacement in legacy designs - though software must implement the AT29BV020-12JU's sector programming protocol instead of EPROM UV-erase workflows.
AT29BV020-12JU 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)
AT29BV020-12JU FAQ
1.How can I place an order for AT29BV020-12JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV020-12JU 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 AT29BV020-12JU reliable?
The price and inventory of AT29BV020-12JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV020-12JU is usually 5 days.
3.What payment methods are accepted for AT29BV020-12JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV020-12JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV020-12JU?
AT29BV020-12JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV020-12JU 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 AT29BV020-12JU?
For technical support, including AT29BV020-12JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV020-12JU requirements.
6.How does Aetrix verify that AT29BV020-12JU is sourced from the original manufacturer or authorized distributors?
All AT29BV020-12JU 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 AT29BV020-12JU meets industry standards.
7.What is the process for return or replacement of AT29BV020-12JU?
All AT29BV020-12JU units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV020-12JU, 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 AT29BV020-12JU part is unused and in its original packaging.
Return procedure for AT29BV020-12JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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