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Microchip Technology AT49LV002-90TC
- Part No.:
- AT49LV002-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LV002-90TC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LV002-90TC from Atmel is a 2 Mbit (256K × 8) single-supply 3.0–3.6 V Flash memory IC designed for in-system reprogramming in embedded boot code storage. It delivers 90 ns read access time, 10-second chip erase, byte-programmable operation (30 µs/byte typical), and hardware data protection - enabling secure firmware updates in industrial controllers and legacy microcontroller-based systems.
For engineers reviewing the AT49LV002-90TC datasheet, AT49LV002-90TC pinout, AT49LV002-90TC application, or AT49LV002-90TC equivalent, key selection considerations include its 32-pin TSOP package, boot block lockout capability (16 KB protected sector), DATA polling/Toggle Bit end-of-write detection, and compatibility with standard EPROM-like CE/OE/WE control timing.
Technical Context
The AT49LV002-90TC implements a sector-erasable Flash architecture with one 16 KB boot block (address range 3C000H–3FFFFH), two 8 KB parameter blocks, and two main memory blocks (96 KB + 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 microprocessor write cycles without external high-voltage generators.
It supports dual operating modes: standard read mode (CE/OE low, WE high) and command execution mode (WE/CE low, OE high), with RESET pin enabling system-level abort and optional 12 V override of boot block lockout. The device features VCC sense, noise filtering on WE/CE, and TTL/CMOS-compatible I/O levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - directly replaces 27C020 EPROMs in 8-bit bus systems. |
| Read Access Time | 90 ns max - ensures compatibility with 10 MHz Z80, 8051, and 68K-based systems requiring fast instruction fetch from boot ROM. |
| Supply Voltage | 3.0 V to 3.6 V - enables direct integration into 3.3 V logic domains without level-shifting or charge pumps. |
| Erase Time | 10 seconds typical for full chip erase - supports field firmware updates with predictable downtime budgeting. |
| Programming Speed | 30 µs/byte typical - allows efficient patching of small code sections without blocking system operation for extended periods. |
| End-of-Write Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Endurance | 10,000 program/erase cycles - validated for repeated field upgrades in industrial HMI and programmable logic controller applications. |
Pinout & Package
AT49LV002-90TC is housed in a 32-lead Thin Small Outline Package (TSOP, Type 1, 8 mm × 20 mm), compliant with JEDEC MO-153. Pin 1 is located at the bottom-left corner (marked by notch or dot), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A14 used for software ID and command entry. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers; supports byte-wide reads/writes and status polling. |
| CE | Chip Enable | Active-low chip select - enables memory access only when asserted; critical for bus contention avoidance in multi-peripheral systems. |
| OE | Output Enable | Active-low output gate - places I/O pins in high-impedance state when deasserted, allowing shared data bus operation. |
| WE | Write Enable | Active-low write strobe - latches address/data during command sequences and byte programming; must be synchronized with CE per AC timing specs. |
| RESET | Reset Input | Active-low system reset input; 12 V pulse enables boot block reprogramming even when lockout is active - unique to non-N variants. |
| VCC | Power Supply | +3.0 V to +3.6 V supply - powers core logic and charge pump; requires local 0.1 µF decoupling per datasheet layout guidelines. |
| GND | Ground Reference | Signal and power ground reference - must be connected to system ground plane with low-inductance path for stable erase/write operation. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB sector (3C000H–3FFFFH) can be permanently write-protected via command sequence - secures bootloader integrity against accidental overwrite. |
| Sector Erase Flexibility | Independent erasure of two 8 KB parameter blocks and two main memory blocks (96 KB/128 KB) - enables modular firmware updates without full chip erase. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) - prevents spurious writes in electrically noisy environments. |
| Low Power Operation | 25 mA active current and 50 µA CMOS standby current - suitable for battery-backed or energy-constrained industrial monitoring nodes. |
| Standard Command Interface | EPROM-compatible CE/OE/WE timing with no external high-voltage generators - simplifies migration from UV-erasable EPROMs and reduces BOM count. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot Code |
|---|---|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers deployed in factory automation cabinets with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing first-instruction fetch at power-on; operates under 0°C to 70°C commercial grade with 90 ns tACC timing. Use Value: Boot block lockout prevents corruption of startup code during field firmware updates; sector erase allows parameter block reconfiguration without resetting control logic. |
Use Scenario: Replacing obsolete 27C020 EPROMs in Z80- or 8051-based medical instrument control boards requiring field-upgradable calibration tables. IC Role / Device Role / Timing Role: Drop-in Flash replacement for 27C020 with identical 32-pin TSOP footprint and EPROM read timing - no PCB redesign needed. Use Value: In-system reprogrammability eliminates UV eraser dependency; DATA polling enables deterministic write completion detection in safety-critical calibration routines. |
| Embedded HMI Configuration Memory | Communications Protocol Stack Storage |
Use Scenario: Holding display language packs, touchscreen calibration data, and user preference settings in human-machine interface panels used in HVAC and building management systems. IC Role / Device Role / Timing Role: Parameter block storage (two 8 KB sectors) accessed via microcontroller SPI-to-parallel bridge; erased/reprogrammed during menu-driven setup. Use Value: Independent sector erase isolates UI data updates from boot code; 10,000-cycle endurance supports frequent customer-facing configuration changes over product lifetime. |
Use Scenario: Storing Modbus RTU and CANopen protocol stacks in gateway devices connecting legacy RS-485 fieldbus networks to Ethernet backbones. IC Role / Device Role / Timing Role: Main memory block (128 KB) hosting protocol binaries updated via secure OTA mechanism; accessed in burst-read mode during packet processing. Use Value: 3.3 V single-supply operation aligns with modern MCU I/O voltage; Toggle Bit detection simplifies host-side write verification without adding software overhead. |
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 | 4 Mbit density (512K × 8), 90 ns access, 3.0–3.6 V supply; lacks RESET-based boot block override. | Higher capacity suits larger firmware images; no 12 V boot unlock - unsuitable where bootloader recovery is mandatory. | Select when >2 Mbit storage is required and boot block override is not needed; verify TSOP-32 pin compatibility. |
| MX29LV002CTTI-90G | 2 Mbit, 90 ns, 3.0–3.6 V; includes CFI query support and wider temperature range (–40°C to +85°C industrial grade). | CFI compliance simplifies auto-detection in generic flash programmers; industrial temp rating supports extended environmental operation. | Choose for new industrial designs requiring guaranteed –40°C performance and standardized flash interface abstraction. |
Compared with SST39VF020-90-4C-NHE and MX29LV002CTTI-90G, the AT49LV002-90TC offers unique 12 V RESET-based boot block reprogramming - a critical differentiator for systems requiring guaranteed bootloader recovery after lockout activation.
Availability
AT49LV002-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot code replacement, embedded HMI configuration memory, and communications protocol stack storage requiring stable component supply across long-lifecycle programs.
Supply support for AT49LV002-90TC 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, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49LV002-90TC belongs to Atmel's low-voltage Flash memory product line, engineered specifically for seamless 3.3 V system integration and in-system reprogrammability in space-constrained embedded applications.
FAQ
What is the memory organization of the AT49LV002-90TC?
The AT49LV002-90TC contains 2 Mbit of Flash memory organized as 262,144 words × 8 bits (256K × 8). Its physical address space spans 00000H to 3FFFFH, with the boot block located at 3C000H–3FFFFH, two 8 KB parameter blocks, and two main memory blocks (96 KB and 128 KB). This structure supports modular firmware partitioning and targeted sector erases.
Does the AT49LV002-90TC support in-system programming without external high voltage?
Yes, the AT49LV002-90TC supports full in-system reprogramming using only its 3.0–3.6 V supply - no external 12 V or 5 V programming voltage is required. All command sequences (chip erase, sector erase, byte program, boot lockout) are executed via standard microprocessor write cycles to specific address/data combinations, eliminating need for dedicated programmers.
How does the boot block lockout feature work on the AT49LV002-90TC?
The AT49LV002-90TC's boot block lockout is enabled via a six-byte command sequence written to addresses 5555H/2AAAH. Once activated, the 16 KB boot sector (3C000H–3FFFFH) becomes write-protected under normal 3.3 V operation. However, applying 12 V to the RESET pin during erase/program operations overrides the lockout - a feature absent in N-suffix variants.
What are the valid methods to detect completion of a byte program cycle on the AT49LV002-90TC?
The AT49LV002-90TC provides two hardware-supported methods: DATA polling (reading the programmed address returns complemented data on I/O7 until completion, then true data) and Toggle Bit detection (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both methods eliminate reliance on fixed timing delays in host firmware.
Is the AT49LV002-90TC pin-compatible with standard 27C020 EPROMs?
Yes, the AT49LV002-90TC in TSOP-32 (32T) package matches the pinout and read-mode timing of the 27C020 EPROM, enabling direct socket replacement in existing 8-bit systems. Its CE/OE/WE control scheme and output drive characteristics comply with EPROM specifications, requiring only VCC adjustment from 5 V to 3.3 V and removal of UV window shielding.
AT49LV002-90TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm 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-TSOP
AT49LV002-90TC FAQ
1.How can I place an order for AT49LV002-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002-90TC 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 AT49LV002-90TC reliable?
The price and inventory of AT49LV002-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002-90TC is usually 5 days.
3.What payment methods are accepted for AT49LV002-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002-90TC?
AT49LV002-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002-90TC 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 AT49LV002-90TC?
For technical support, including AT49LV002-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002-90TC requirements.
6.How does Aetrix verify that AT49LV002-90TC is sourced from the original manufacturer or authorized distributors?
All AT49LV002-90TC 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 AT49LV002-90TC meets industry standards.
7.What is the process for return or replacement of AT49LV002-90TC?
All AT49LV002-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002-90TC, 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 AT49LV002-90TC part is unused and in its original packaging.
Return procedure for AT49LV002-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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