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Microchip Technology AT49BV002T-90JC
- Part No.:
- AT49BV002T-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV002T-90JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,657
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Product details
Overview
AT49BV002T-90JC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 2.7–3.6 V in-system reprogrammable 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 commercial temperature range (0°C to 70°C) in a 32-lead PLCC package.
For engineers reviewing the AT49BV002T-90JC datasheet, AT49BV002T-90JC pinout, AT49BV002T-90JC application, or AT49BV002T-90JC equivalent, key selection considerations include boot block lockout behavior (3C000H–3FFFFH), DC/AC timing compliance at 90 ns tACC, hardware reset-based override capability, and compatibility with standard 8-bit parallel bus interfaces in legacy industrial controllers and firmware-upgradable devices.
Technical Context
The AT49BV002T-90JC implements a parallel-interface Flash memory architecture with dedicated boot block (16 KB), two parameter blocks (8 KB each), and two main memory blocks (96 KB and 128 KB). Its command-set-driven operation uses six-byte sequences for chip/sector erase and four-byte sequences for byte programming, all executed via standard CE/OE/WE control logic without requiring external high-voltage generators.
It supports DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) for program/erase cycle completion detection, and integrates hardware data protection including VCC sense (<1.8 V inhibit), noise filtering (<15 ns pulse rejection), and write-inhibit logic (OE low, CE high, or WE high). The RESET pin enables both system reset and 12 V–based boot block override.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly maps to 8-bit microprocessor data bus without address translation. |
| Read Access Time | 90 ns max (tACC) - ensures compatibility with 11 MHz bus timing in legacy 8051 and Z80-based systems. |
| Supply Voltage | 2.7 V to 3.6 V - supports battery-backed and low-power embedded applications without level-shifting circuitry. |
| Erase Cycle Time | 10 seconds typical for full chip erase - enables field firmware updates within defined maintenance windows. |
| Byte Programming Time | 30 µs typical (50 µs max) - allows fine-grained patching of configuration or calibration data without bulk rewrites. |
| Endurance | 10,000 program/erase cycles - validated for long-term use in industrial logging, bootloader storage, and parameter retention. |
| Standby Current | 50 µA CMOS - meets ultra-low-power requirements for always-on monitoring subsystems. |
Pinout & Package
AT49BV002T-90JC is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-leads, pin-compatible with industry-standard 32-pin PLCC footprints. Pin 1 is designated as A7 (not DC), and RESET is functional (unlike N-suffix variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 map directly to physical memory locations. |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; latched on rising edge of WE/CE during programming, driven during read. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in multi-device systems. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high - essential for shared data bus arbitration. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data during programming cycles. |
| RESET | Reset Input | Active-low system reset; applying 12 V ±0.5 V enables boot block reprogramming even when lockout is active. |
| VCC / GND | Power Supply | Single 2.7–3.6 V supply; decoupling required per JEDEC PLCC layout guidelines to maintain tACC stability. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16 KB protected region (3C000H–3FFFFH) with software-enabled permanent write protection - secures bootloader integrity against accidental overwrite. |
| Hardware Boot Override | 12 V on RESET pin bypasses boot block lockout during erase/program - enables recovery without hardware modification or device replacement. |
| Sector Erase Flexibility | Independent erasure of two 8 KB parameter blocks and two main memory blocks (96 KB/128 KB) - supports modular firmware updates without full chip erase. |
| DATA Polling & Toggle Bit | Dual-cycle completion detection (I/O7 complement + I/O6 toggle) - eliminates need for fixed delay timers in host firmware, improving update reliability. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit logic - prevents spurious writes during power transients or EMI events in industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Bootloader |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with 90 ns read access and hardware write protection - serves as primary boot source and runtime parameter repository. Use Value: Enables field-upgradable firmware while preventing corruption of critical startup routines via boot block lockout and 12 V RESET override. | Use Scenario: Hosting secure bootloader code in 8-bit microcontroller-based medical instruments requiring regulatory-compliant firmware validation and recovery paths. IC Role / Device Role / Timing Role: Trusted execution environment anchor - stores immutable boot code (3C000H–3FFFFH) and supports verified application updates in parameter/main blocks. Use Value: Meets IEC 62304 safety requirements through hardware-enforced boot integrity and deterministic erase/program timing. |
| Automotive Diagnostic Module Memory | Point-of-Sale Terminal Configuration Storage |
Use Scenario: Retaining diagnostic fault logs and calibration tables in OBD-II modules exposed to automotive-grade temperature and vibration stress. IC Role / Device Role / Timing Role: High-reliability data logger memory - leverages 10,000-cycle endurance and 50 µA standby current for infrequent but mission-critical writes. Use Value: Survives 15+ years of automotive service life with guaranteed data retention and immunity to brown-out-induced corruption. | Use Scenario: Storing localized language packs, tax tables, and merchant-specific settings in retail terminals deployed globally with minimal service access. IC Role / Device Role / Timing Role: Field-serviceable configuration store - uses sector-erase capability to update parameter blocks independently of main application code. Use Value: Reduces downtime during regional compliance updates by enabling targeted 8 KB block reprogramming instead of full 256 KB reloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-90-4C-NHE | 3.3 V only (3.0–3.6 V), 90 ns access, same 2 Mbit density and PLCC-32 package; lacks 12 V RESET override and boot block lockout override capability. | No hardware-based boot recovery path; requires full chip erase if boot code becomes corrupted. | Select when strict 3.3 V operation is required and boot recovery is handled externally via watchdog or dual-bank firmware. |
| MX29LV020TC-90G | 3.3 V operation, 90 ns access, 2 Mbit density, PLCC-32; includes CFI-compliant command set but no dedicated boot block lockout feature - protection relies on software-managed sector locking. | Requires host MCU to manage sector protection state; no hardware-enforced boot immutability. | Select when CFI compatibility and broader toolchain support are prioritized over hardware-level boot security. |
Compared with SST39VF020-90-4C-NHE and MX29LV020TC-90G, the AT49BV002T-90JC uniquely delivers hardware-enforced boot block immutability with 12 V RESET override - critical for safety-critical or unattended systems where firmware recovery must be guaranteed without host intervention.
Availability
AT49BV002T-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system bootloader implementation, and automotive diagnostic module memory requiring stable component supply, long-term lifecycle support, and guaranteed second-source availability.
Supply support for AT49BV002T-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 product support, documentation, and manufacturing continuity for the AT49BV/LV series.
The AT49BV002T-90JC belongs to Atmel's Battery-Voltage™ Flash memory product line, designed specifically for reliable, low-voltage in-system reprogramming in resource-constrained 8-bit embedded systems where firmware integrity and field upgradeability are paramount.
FAQ
What is the boot block address range for AT49BV002T-90JC?
The boot block for AT49BV002T-90JC occupies address range 3C000H to 3FFFFH (16 KB), distinct from the base AT49BV002(N) variant which uses 00000H–03FFFH. This relocated boot sector enables flexible memory mapping in systems requiring top-of-memory boot execution, and is confirmed in the device's block diagram and command definition tables.
Does AT49BV002T-90JC support 12 V reset-based boot block override?
Yes, AT49BV002T-90JC supports 12 V ±0.5 V applied to the RESET pin to override enabled boot block lockout during chip erase, sector erase, or byte programming. This feature is explicitly documented in the "Boot Block Programming Lockout Override" section and is not available on N-suffix variants like AT49BV002N(T).
What is the maximum erase time for AT49BV002T-90JC?
The maximum erase time for AT49BV002T-90JC is 10 seconds for full chip erase, as specified in the "ERASURE" section and AC characteristics table. Sector erase times are not individually specified but fall within the same 10-second bound due to internal timing control - no external clocks or polling delays beyond DATA polling or Toggle Bit detection are required.
Is AT49BV002T-90JC compatible with standard 8-bit microprocessor buses?
Yes, AT49BV002T-90JC is fully compatible with standard 8-bit parallel buses using CE/OE/WE control signals. Its timing parameters (tACC = 90 ns, tCE = 90 ns, tOE = 40 ns) meet or exceed requirements for 8051, Z80, and 68000-family peripherals, and its I/O0–I/O7 bidirectional data bus aligns directly with common 8-bit data bus architectures.
How does hardware data protection work in AT49BV002T-90JC?
AT49BV002T-90JC implements three hardware data protection mechanisms: (1) VCC sense circuitry inhibits programming if supply drops below ~1.8 V; (2) write inhibition when OE is low, CE is high, or WE is high; and (3) noise filtering rejecting input pulses shorter than 15 ns on CE or WE. These are detailed in the "HARDWARE DATA PROTECTION" section and ensure robustness in electrically noisy environments.
AT49BV002T-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)
AT49BV002T-90JC FAQ
1.How can I place an order for AT49BV002T-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002T-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 AT49BV002T-90JC reliable?
The price and inventory of AT49BV002T-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002T-90JC is usually 5 days.
3.What payment methods are accepted for AT49BV002T-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002T-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002T-90JC?
AT49BV002T-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002T-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 AT49BV002T-90JC?
For technical support, including AT49BV002T-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002T-90JC requirements.
6.How does Aetrix verify that AT49BV002T-90JC is sourced from the original manufacturer or authorized distributors?
All AT49BV002T-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 AT49BV002T-90JC meets industry standards.
7.What is the process for return or replacement of AT49BV002T-90JC?
All AT49BV002T-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002T-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 AT49BV002T-90JC part is unused and in its original packaging.
Return procedure for AT49BV002T-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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