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Microchip Technology AT49BV002N-90JC
- Part No.:
- AT49BV002N-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV002N-90JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,988
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Product details
Overview
AT49BV002N-90JC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 3V-only Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It features 70 ns read access time, 10-second chip erase, byte-programmable architecture with sector protection, and operates across 0°C to 70°C commercial temperature range in a 32-lead PLCC package.
For engineers reviewing the AT49BV002N-90JC datasheet, AT49BV002N-90JC pinout, AT49BV002N-90JC application, or AT49BV002N-90JC equivalent, key selection considerations include its 2.7–3.6V VCC range, boot block lockout capability, DATA polling/Toggle Bit programming status detection, and compatibility with standard EPROM-like bus interfaces (CE/OE/WE).
Technical Context
The AT49BV002N-90JC implements a sector-organized Flash architecture with one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (96 KB + 128 KB). It uses standard microprocessor write timings and internal command register control for erase and program operations without requiring external high-voltage programming signals.
Its operation relies on six-byte software command sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H → …) entered via address/data bus under specific CE/OE/WE timing constraints. 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 - supports full firmware image storage for 8-bit MCUs. |
| Read Access Time | 90 ns max - enables direct execution from flash (XIP) in systems with ≤11 MHz bus clocks. |
| VCC Supply Range | 2.7 V to 3.6 V - compatible with single-cell Li-ion, 3.3 V logic rails, and battery-backed operation. |
| Byte Programming Time | 30 µs typical - allows rapid field updates of configuration data or calibration parameters. |
| Chip Erase Time | 10 seconds max - deterministic erase cycle suitable for production programming and recovery workflows. |
| Endurance | 10,000 program/erase cycles - validated for firmware update partitions in industrial controllers. |
| Standby Current | 50 µA CMOS - enables low-power sleep modes in portable or energy-harvesting devices. |
Pinout & Package
AT49BV002N-90JC is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC), 11.43 mm × 13.97 mm body, J-lead profile, RoHS-compliant. Pin 1 is index corner; pin 32 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte-level access. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K-family microcontrollers. |
| CE | Chip Enable | Active-low chip select; enables device for read/write when low and OE/WE satisfy mode conditions. |
| OE | Output Enable | Active-low output gate; controls data bus drive during read; high-Z when deasserted to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming. |
| RESET | DC Input (No Function) | DC-connected per datasheet; not functional for reset or boot override - differs from T-suffix variants. |
| DC | No Connect | Pin 1 in PLCC package is unconnected; must be left floating or tied to ground per layout guidelines. |
| VCC / GND | Power / Reference | Single 2.7–3.6 V supply; decoupling capacitor (0.1 µF) required within 10 mm of VCC/GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code after enable command sequence. |
| DATA Polling & Toggle Bit | Hardware-supported status feedback (I/O7 complement / I/O6 toggle) eliminates need for fixed delay timers during programming. |
| Sector-Erasable Architecture | Independent erasure of parameter blocks (8 KB each) enables field-updatable configuration storage without disturbing main firmware. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock prevent spurious writes. |
| EPROM-Compatible Interface | Standard CE/OE/WE timing and bus behavior allow drop-in replacement of UV-erasable EPROMs in legacy designs. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing boot firmware and runtime configuration in programmable logic controllers with periodic field updates. IC Role / Device Role / Timing Role: Nonvolatile code storage with hardware-protected boot sector and sector-erase capability for safe firmware patching. Use Value: Prevents corruption of critical startup code while enabling secure, in-system reprogramming of application modules without full chip erase. | Use Scenario: Retaining calibrated sensor offsets and user preferences in portable diagnostic equipment operating on battery power. IC Role / Device Role / Timing Role: Low-power, byte-programmable data logger memory with 50 µA standby current and 30 µs write latency. Use Value: Extends battery life between charges and supports rapid calibration updates during device servicing without full memory reinitialization. |
| Automotive Body Control Module | Consumer Set-Top Box Bootloader |
Use Scenario: Holding vehicle-specific configuration (e.g., door lock logic, lighting profiles) in automotive BCMs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Industrial-grade (-40°C to +85°C) Flash memory with 10,000-cycle endurance for infrequent but mission-critical updates. Use Value: Ensures reliable parameter retention over 15-year vehicle lifetime and supports dealership-level reconfiguration via CAN-based flash tools. | Use Scenario: Storing immutable bootloader code and updatable application firmware in digital TV receivers with OTA update capability. IC Role / Device Role / Timing Role: Dual-role memory: locked boot block (00000H–03FFFH) for secure boot, main blocks for signed firmware images. Use Value: Enables secure boot chain enforcement and atomic firmware swaps using sector-erase isolation - no risk of partial update corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002N-90PC | DIP-32 package instead of PLCC-32; identical electrical specs and timing. | Suitable for through-hole prototyping or legacy PCBs with DIP footprints. | Select when mechanical mounting or hand-soldering is required; same firmware and timing compatibility. |
| SST39VF200A-90-4C-NHE | 4 Mbit density (512K × 8), 90 ns access, 3.0–3.6 V; different command set and sector map. | Higher capacity for larger firmware; requires driver adaptation due to different unlock sequences. | Choose when >2 Mbit storage is needed and software can be modified for SST's 3-byte unlock protocol. |
Compared with AT49BV002N-90PC, the AT49BV002N-90JC offers surface-mount reliability and higher board density; compared with SST39VF200A, it provides proven bootloader lockout and simpler command sequencing at lower density - ideal for cost-sensitive, space-constrained MCU systems.
Availability
AT49BV002N-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49BV002N-90JC 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 legacy Atmel Flash products including the AT49BV series.
The AT49BV002N-90JC belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for single-supply, in-system reprogrammable code storage in resource-constrained 8-bit and 16-bit embedded systems.
FAQ
What is the function of the RESET pin on the AT49BV002N-90JC?
The RESET pin on the AT49BV002N-90JC is a DC-connected (no-connect) terminal per the datasheet - it has no functional role in reset, boot override, or programming. Unlike the T-suffix variants, this pin cannot be used to re-enable boot block programming. It must be left unconnected or tied to ground per layout guidance, and does not affect AT49BV002N-90JC operation.
Does the AT49BV002N-90JC support in-system programming without high-voltage signals?
Yes, the AT49BV002N-90JC supports full in-system programming using only its 2.7–3.6 V VCC supply - no external 12 V or 5 V programming voltage is required. All erase and program operations are initiated via six-byte software command sequences written to specific address locations (e.g., 5555H/AAH), making AT49BV002N-90JC compatible with standard 3.3 V microcontroller buses.
How is boot block protection enabled on the AT49BV002N-90JC?
Boot block protection on the AT49BV002N-90JC is enabled by executing a six-cycle command sequence: write AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H. Once activated, the 16 KB boot block (00000H–03FFFH) becomes permanently write-protected at ≤5.5 V - a feature confirmed in the AT49BV002N-90JC datasheet Rev. 0982D.
What package type is used for the AT49BV002N-90JC?
The AT49BV002N-90JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering nomenclature. It features a 11.43 mm × 13.97 mm body with J-leads, is RoHS-compliant, and has pin 1 at the index corner. This surface-mount package supports automated assembly and offers better thermal performance than DIP alternatives.
Can the AT49BV002N-90JC be used as a direct replacement for EPROMs like the 27C256?
Yes, the AT49BV002N-90JC is pin-compatible and functionally compatible with 27C256 EPROMs in read mode: it uses identical CE/OE/WE control signaling, outputs valid data within 90 ns of address/CE assertion, and presents high-impedance outputs when deselected. However, AT49BV002N-90JC requires software command sequences for programming - unlike UV-erasable EPROMs - so system firmware must implement the unlock and write protocols.
AT49BV002N-90JC 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:
- 90 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-90JC FAQ
1.How can I place an order for AT49BV002N-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002N-90JC 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-90JC reliable?
The price and inventory of AT49BV002N-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002N-90JC is usually 5 days.
3.What payment methods are accepted for AT49BV002N-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002N-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002N-90JC?
AT49BV002N-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002N-90JC 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-90JC?
For technical support, including AT49BV002N-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002N-90JC requirements.
6.How does Aetrix verify that AT49BV002N-90JC is sourced from the original manufacturer or authorized distributors?
All AT49BV002N-90JC 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-90JC meets industry standards.
7.What is the process for return or replacement of AT49BV002N-90JC?
All AT49BV002N-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002N-90JC, 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-90JC part is unused and in its original packaging.
Return procedure for AT49BV002N-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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