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Microchip Technology AT49LV002-90VC
- Part No.:
- AT49LV002-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49LV002-90VC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LV002-90VC from Microchip Technology (formerly Atmel) is a 2-Mbit (256K × 8) single-supply 3.0–3.6V in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 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). Its VSOP-32 package supports space-constrained industrial control and legacy BIOS applications.
For engineers reviewing the AT49LV002-90VC datasheet, AT49LV002-90VC pinout, AT49LV002-90VC application, or AT49LV002-90VC equivalent, key selection criteria include boot-block lockout capability, DC-level hardware reset override (12V), DATA polling/Toggle Bit program-verification methods, and compatibility with standard 8-bit parallel bus interfaces using CE/OE/WE control signals.
Technical Context
This device implements a parallel-interface Flash memory architecture with dedicated 16KB boot block (address 00000H–03FFFH), two 8KB parameter blocks, and two main memory blocks (96KB + 128KB). It uses command-based software control - including six-cycle chip/sector erase and four-cycle byte programming - without requiring external high-voltage programming supplies.
Hardware data protection includes VCC sense (<1.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low / CE high / WE high disables writes). The RESET pin supports both TTL-level reset and 12V override of boot-block lockout, though the latter is disabled on N-suffix variants - confirmed functional on AT49LV002-90VC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - directly maps to 8-bit microprocessor data bus without glue logic. |
| Read Access Time | 90 ns max - ensures timing compliance with 11 MHz bus clocks in legacy x86 and 8051-based systems. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with regulated 3.3V rails; no 5V support required for read/write operations. |
| Erase Cycle Time | 10 seconds typical for full chip erase - enables field firmware updates without external erasers. |
| Byte Programming Time | 30 µs typical - supports efficient patching of small code/data segments during runtime or bootloader execution. |
| End-of-Write Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Boot Block Protection | 16KB write-lockable region (00000H–03FFFH) with 12V RESET override - secures boot code while permitting field-upgradable application code. |
Pinout & Package
AT49LV002-90VC uses a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body, JEDEC MO-178 compliant, with gull-wing leads and 0.5 mm pitch. Pin 1 marked via notch or dot; pin 9 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–A15 used for byte selection within 64KB pages. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; tri-stated when CE or OE high - prevents bus contention in shared-memory systems. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - enables memory-mapped decoding. |
| OE | Output Enable | Active-low output control; allows multiple devices on same data bus by enabling only one at a time. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing - critical for reliable software sequencing. |
| RESET | Reset Input | Active-low TTL reset; 12V input enables boot-block reprogramming even after lockout - unique to non-N/T suffix variants like AT49LV002-90VC. |
| VCC | Power Supply | +3.0V to +3.6V supply; decoupling capacitor (0.1 µF) required near pin for stable read/write operation. |
| GND | Ground Reference | Signal and power ground reference; separate ground plane recommended to minimize noise coupling into I/O lines. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16KB boot block (00000H–03FFFH) programmable lockout prevents accidental overwrite of bootloader code - essential for fail-safe system recovery. |
| DC-Level 12V RESET Override | Applying 12V ±0.5V to RESET pin bypasses boot-block lockout during erase/program - enables secure field reflash without hardware redesign. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition prevent spurious writes during power transients or EMI events - improves system reliability in industrial environments. |
| DATA Polling & Toggle Bit | Real-time program/erase status feedback via I/O7 complement or I/O6 toggling - eliminates fixed delays and simplifies host driver development. |
| Low-Power Operation | 25 mA active current and 50 µA CMOS standby current - suitable for battery-backed or energy-conscious embedded designs. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Storing firmware 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 in-system reprogrammability; executes as memory-mapped ROM during CPU boot and runtime. Use Value: Sector erase and boot-block lockout allow safe field updates of application logic while preserving critical startup routines - reducing downtime and service costs. |
Use Scenario: Replacing obsolete EPROMs in desktop motherboard BIOS chips where socketed upgradeability and 3.3V compatibility are required. IC Role / Device Role / Timing Role: Parallel-interface Flash memory mapped to CPU address space; accessed via standard CE/OE/WE timing. Use Value: 90 ns access time meets Intel 486/Pentium-era timing budgets; VSOP-32 footprint matches legacy SOIC-32 sockets with adapter. |
| Embedded Microcontroller Bootloader | Medical Device Configuration Storage |
Use Scenario: Hosting secure bootloader code in resource-constrained medical instrumentation with strict firmware integrity requirements. IC Role / Device Role / Timing Role: Primary boot memory with hardware-enforced write protection on first 16KB - verified at power-on before application load. Use Value: 12V RESET override enables authorized reflash of locked boot sector during certified maintenance - satisfying IEC 62304 traceability requirements. |
Use Scenario: Storing calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Parameter storage memory accessed via microcontroller GPIO-banged or parallel bus interface during initialization. Use Value: 10,000 write cycles and 20-year data retention ensure long-term reliability across device lifecycle - validated per JEDEC JESD22-A117. |
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 | 3.0–3.6V supply, 90 ns access, 2 Mbit, PLCC-32; lacks 12V RESET override and boot-block lockout override. | No hardware mechanism to reprogram locked boot sector - requires full chip erase if boot code corruption occurs. | Choose when boot-block security is not required and PLCC packaging is preferred for socketed prototyping. |
| MX29LV002CTTI-90G | 3.0–3.6V, 90 ns, 2 Mbit, TSOP-32; supports CFI query but no 12V RESET feature; boot block at 00000H–03FFFH. | CFI-compliant interface simplifies auto-detection in generic flash programmers, but no hardware override for locked sectors. | Prefer for systems using CFI-aware bootloaders and where TSOP-32 footprint aligns with existing PCB layout. |
Compared with SST39VF020-90-4C-NHE and MX29LV002CTTI-90G, AT49LV002-90VC uniquely provides 12V-driven RESET override of boot-block lockout - enabling secure, field-serviceable reflash without sacrificing boot integrity - while maintaining pin-compatible VSOP-32 footprint and identical 90 ns timing.
Availability
AT49LV002-90VC is available at Aetrix Electronics and suitable for industrial control, legacy BIOS replacement, embedded bootloader, and medical device configuration storage requiring stable component supply, long-lifecycle support, and guaranteed obsolescence management.
Supply support for AT49LV002-90VC 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 technical and manufacturing continuity for the AT49LV series. The company specializes in microcontrollers, analog, Flash memory, and security ICs for industrial, automotive, and consumer markets.
AT49LV002-90VC belongs to Atmel's legacy parallel Flash memory product line, designed specifically for in-system reprogrammability in 8-bit and 16-bit embedded systems requiring robust, low-voltage nonvolatile storage with hardware-level data protection.
FAQ
What voltage levels are required to operate AT49LV002-90VC?
AT49LV002-90VC operates exclusively from a 3.0 V to 3.6 V supply (VCC). It does not support 5 V operation. For programming and erase functions, no external high voltage is needed - all commands execute at VCC levels. However, the RESET pin accepts 12.0 V ± 0.5 V solely to override boot-block lockout; this voltage must be applied only during active erase/program cycles and removed before normal operation resumes. AT49LV002-90VC remains fully functional at 3.3 V nominal.
Does AT49LV002-90VC support hardware write protection independent of software commands?
Yes, AT49LV002-90VC includes three hardware data protection mechanisms: (1) VCC sense circuitry disables programming if supply drops below ~1.8 V; (2) any of OE low, CE high, or WE high inhibits write cycles; and (3) input noise filters reject pulses shorter than 15 ns on CE or WE. These features operate autonomously without firmware involvement, preventing unintended writes during power-up, brown-out, or EMI events - critical for AT49LV002-90VC deployments in harsh industrial environments.
How is the boot block protected, and can it be reprogrammed after lockout?
The AT49LV002-90VC boot block (16KB, addresses 00000H–03FFFH) is protected via a software lockout command sequence. Once enabled, standard 3.3V programming cannot modify its contents. However, AT49LV002-90VC uniquely supports 12V application to the RESET pin during erase/program cycles to temporarily disable lockout - allowing authorized reprogramming. This override is hardware-gated and only active while 12V is present; it is not available on N-suffix variants, confirming AT49LV002-90VC's enhanced serviceability.
What are the timing-critical signals for reliable byte programming of AT49LV002-90VC?
Reliable byte programming of AT49LV002-90VC requires strict adherence to AC timing: address setup/hold times ≥ 70 ns, data setup/hold ≥ 70 ns, and WE pulse width ≥ 90 ns. Address and data are latched on the falling edge of the last-occurring control signal (CE or WE) and rising edge of the first-occurring one. Violating tAH, tDS, or tWP risks incomplete writes or data corruption - especially under temperature extremes. These values are specified in the AT49LV002-90VC datasheet Rev. 0982D, Section 11.
Is AT49LV002-90VC pin-compatible with other members of the AT49BV/LV002 family?
Yes, AT49LV002-90VC shares identical pinout, package (VSOP-32), and signal definitions with all AT49BV/LV002(N)(T) variants - including AT49BV002-90VC and AT49LV002N-90VC. Differences lie in voltage range (BV = 2.7–3.6V; LV = 3.0–3.6V), temperature grade (C vs I), and feature availability (e.g., 12V RESET override is absent on N-suffix parts). Thus, AT49LV002-90VC can substitute for AT49BV002-90VC in 3.3V-only systems, but not vice versa in 2.7V battery-powered designs.
AT49LV002-90VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49LV002-90VC FAQ
1.How can I place an order for AT49LV002-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002-90VC 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 AT49LV002-90VC reliable?
The price and inventory of AT49LV002-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002-90VC is usually 5 days.
3.What payment methods are accepted for AT49LV002-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002-90VC?
AT49LV002-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002-90VC 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 AT49LV002-90VC?
For technical support, including AT49LV002-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002-90VC requirements.
6.How does Aetrix verify that AT49LV002-90VC is sourced from the original manufacturer or authorized distributors?
All AT49LV002-90VC 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 AT49LV002-90VC meets industry standards.
7.What is the process for return or replacement of AT49LV002-90VC?
All AT49LV002-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002-90VC, 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 AT49LV002-90VC part is unused and in its original packaging.
Return procedure for AT49LV002-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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