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Microchip Technology AT49BV002N-12JC
- Part No.:
- AT49BV002N-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV002N-12JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
AT49BV002N-12JC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 2.7–3.6V in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 120 ns read access time, 10-second chip erase, byte-programming at 30 µs/byte, and features hardware data protection, DATA polling, and a 16KB boot block with programmable lockout. It is commonly deployed in firmware update storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49BV002N-12JC datasheet, AT49BV002N-12JC pinout, AT49BV002N-12JC application, or AT49BV002N-12JC equivalent, key selection criteria include its PLCC-32 package, 2.7–3.6V VCC range, sector-based erase architecture (boot + parameter + main blocks), CMOS standby current of 50 µA, and compatibility with standard EPROM-like bus interface timing.
Technical Context
The AT49BV002N-12JC implements a command-register-based Flash architecture with six-byte software command sequences for chip/sector erase and boot lockout enable. Its internal logic supports dual-line control (CE/OE) to prevent bus contention and uses address-latched WE/CE falling edges for command entry.
It integrates hardware safeguards including VCC sense (<1.8V inhibits programming), noise filtering (<15 ns pulses ignored), and program inhibit via CE high/OE low/WE high states. The RESET pin is DC-connected (not functional for reset or boot override), distinguishing it from T-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly replaces 27C020 EPROMs in 8-bit bus systems. |
| Read Access Time | 120 ns max - defines minimum bus cycle time for reliable CPU read operations without wait states. |
| Supply Voltage | 2.7 V to 3.6 V - enables direct connection to 3.3V logic rails without level-shifting or external regulators. |
| Erase Cycle Time | 10 seconds typical for full chip erase - impacts firmware field update latency and system recovery time. |
| Byte Programming Time | 30 µs typical - determines maximum sustained write throughput during in-system programming. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Write Endurance | 10,000 program/erase cycles - sets lifetime limit for dynamic configuration storage applications. |
Pinout & Package
AT49BV002N-12JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package with standard 1.27 mm pitch and body size 13.97 mm × 13.97 mm. Pin 1 is marked by a notch on the top surface; pin 1 is NC (No Connect) per datasheet Rev. 0982D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A14 used for command entry (e.g., 5555H, 2AAAH). |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device activation in multi-chip memory maps. |
| OE | Output Enable | Active-low output control; used with CE to gate data bus drivers and avoid contention during shared-bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge for command entry and byte programming. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for reads, writes, and command/data loading; supports true bidirectional I/O without direction pins. |
| VCC | Power Supply | 2.7–3.6V main supply; powers core logic, charge pumps, and I/O buffers; requires local 0.1 µF decoupling. |
| GND | Ground Reference | Signal and power return; must be low-impedance connection to minimize noise coupling during erase/write transitions. |
| RESET | Reset Input | DC-connected (not functional); tied high internally; no reset assertion or boot override capability in N-suffix variant. |
| DC | No Connect | Pin 1 (PLCC); must remain unconnected on PCB; floating or grounded violates absolute max ratings. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6V supply | Eliminates need for 5V or 12V programming voltages - simplifies power design and enables direct integration with 3.3V microcontrollers. |
| Boot block programming lockout | 16KB protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code during field updates. |
| Sector architecture | One 16KB boot block + two 8KB parameter blocks + two main blocks (96KB/128KB) - enables granular firmware partitioning and selective reprogramming. |
| Hardware data protection | VCC sense, noise filtering, and control-line inhibit prevent spurious writes due to power glitches or EMI. |
| DATA polling & Toggle Bit | Real-time status feedback via I/O7/I/O6 allows host CPU to poll completion without fixed delays or external timers. |
Applications
| Industrial PLC Firmware Storage | Legacy BIOS Code Storage |
|---|---|
Use Scenario: Storing field-upgradable ladder logic and I/O configuration in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 120 ns read access to support real-time scan cycle execution. Use Value: Enables remote firmware patches without hardware replacement; boot block lockout ensures bootloader integrity across 10,000+ field updates. |
Use Scenario: Holding POST routines and hardware initialization code in x86-compatible embedded motherboards where EPROM sockets are obsolete. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical 8-bit parallel interface and CE/OE/WE control; supports standard BIOS memory map at 00000H–3FFFFH. Use Value: Eliminates UV erasers and programmers; 2.7–3.6V operation allows direct use with 3.3V southbridge I/O, reducing BOM count. |
| Medical Device Configuration Memory | Telecom Line Card Bootloader |
Use Scenario: Retaining calibration tables and safety-critical operational parameters in FDA-cleared diagnostic equipment requiring data retention over 10 years. IC Role / Device Role / Timing Role: Parameter block storage (two 8KB sections) for secure, versioned configuration data accessed during power-on self-test. Use Value: Sector-erase capability allows independent update of calibration data without disturbing main application firmware; 50 µA standby current extends battery backup life. |
Use Scenario: Hosting boot code for DSP-based line interface units in carrier-class DSLAMs, where field upgrades must preserve boot integrity under continuous operation. IC Role / Device Role / Timing Role: Boot block (16KB) stores verified, signed bootloader; main blocks hold application images updated via TFTP. Use Value: Boot lockout prevents corruption during power-fail events; 10-second erase enables rapid failover to backup image during maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002N-12PC | DIP-32 package instead of PLCC-32; same electrical specs, timing, and command set. | Through-hole mounting for prototyping or legacy board repair; lacks surface-mount thermal/mechanical advantages. | Select when manual soldering, socket-based testing, or DIP footprint compatibility is required. |
| SST39VF020-120-4C-NHE | 2 Mbit Flash with 120 ns access, but uses different command set (SST proprietary), no boot lockout, and 3.0–3.6V only. | Lacks dedicated boot block protection; requires modified host driver for erase/program commands. | Choose only if SST's faster 18 µs byte program time justifies firmware redesign and loss of Atmel's lockout security model. |
Compared with AT49BV002N-12PC, the AT49BV002N-12JC offers superior thermal performance and board space efficiency in surface-mount designs; compared with SST39VF020, it provides guaranteed boot-sector integrity and Atmel-command compatibility for drop-in legacy replacements.
Availability
AT49BV002N-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS code replacement, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT49BV002N-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
Microchip Technology acquired Atmel in 2016 and maintains full support for the AT49BV/LV family of parallel Flash memories, emphasizing reliability, long-term availability, and industrial temperature grade assurance.
The AT49BV002N-12JC belongs to Atmel's Battery-Voltage™ Flash memory product line, designed specifically for 3V-only embedded systems needing in-system reprogrammability without high-voltage programming circuitry.
FAQ
What is the function of the RESET pin on the AT49BV002N-12JC?
The RESET pin on the AT49BV002N-12JC is a DC-connected (no-connect) terminal per datasheet Rev. 0982D. It is not functional for reset assertion or boot block override - unlike T-suffix variants, the AT49BV002N-12JC does not support 12V RESET-based reprogramming. It must be left unconnected on the PCB to comply with absolute maximum ratings.
Does the AT49BV002N-12JC support sector erase, and what are the address ranges?
Yes, the AT49BV002N-12JC supports sector erase. Its memory is divided into one 16KB boot block (00000H–03FFFH), two 8KB parameter blocks (04000H–05FFFH and 06000H–07FFFH), and two main memory blocks (08000H–1FFFFH and 20000H–3FFFFH). Each sector can be erased independently using the six-cycle command sequence with appropriate sector address input.
How is end-of-program detection implemented in the AT49BV002N-12JC?
The AT49BV002N-12JC provides two hardware-supported methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both allow the host controller to detect readiness without fixed timing loops or external components.
What is the purpose of the boot block programming lockout feature in the AT49BV002N-12JC?
When enabled via the six-command sequence, the boot block programming lockout permanently protects the 16KB boot sector (00000H–03FFFH) from accidental erasure or reprogramming using ≤5.5V signals. This ensures bootloader integrity in field-deployed systems, allowing safe updates to application code in other sectors while preserving startup firmware.
Can the AT49BV002N-12JC be used as a direct replacement for the AT29C020 EPROM?
Yes, the AT49BV002N-12JC is pin-compatible and functionally compatible with the AT29C020 in read mode, sharing identical 32-pin PLCC layout, 256K × 8 organization, and CE/OE/WE control interface. However, it requires software adaptation for erase/program commands and leverages 3V-only operation instead of 5V, eliminating need for VPP programming voltage.
AT49BV002N-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:
- 50µs
- 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)
AT49BV002N-12JC FAQ
1.How can I place an order for AT49BV002N-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002N-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 AT49BV002N-12JC reliable?
The price and inventory of AT49BV002N-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002N-12JC is usually 5 days.
3.What payment methods are accepted for AT49BV002N-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002N-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002N-12JC?
AT49BV002N-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002N-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 AT49BV002N-12JC?
For technical support, including AT49BV002N-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002N-12JC requirements.
6.How does Aetrix verify that AT49BV002N-12JC is sourced from the original manufacturer or authorized distributors?
All AT49BV002N-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 AT49BV002N-12JC meets industry standards.
7.What is the process for return or replacement of AT49BV002N-12JC?
All AT49BV002N-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002N-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 AT49BV002N-12JC part is unused and in its original packaging.
Return procedure for AT49BV002N-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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