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Microchip Technology AT49LV002T-90PC
- Part No.:
- AT49LV002T-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49LV002T-90PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,624
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Product details
Overview
AT49LV002T-90PC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 3.0–3.6 V in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 90 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). It is commonly deployed in boot firmware storage for industrial controllers and legacy communication modules.
For engineers reviewing the AT49LV002T-90PC datasheet, AT49LV002T-90PC pinout, AT49LV002T-90PC application, or AT49LV002T-90PC equivalent, key selection criteria include its 32-pin PDIP package, boot block lockout capability (address range 3C000H–3FFFFH), DATA polling/Toggle Bit programming verification, and compatibility with standard EPROM-style bus interface timing.
Technical Context
The AT49LV002T-90PC implements a sector-organized Flash architecture with one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). 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 without requiring high-voltage programming signals.
Hardware data protection includes VCC sense (program inhibited below 1.8 V), noise filtering on WE/CE (<15 ns pulses ignored), and active inhibit logic (OE low, CE high, or WE high blocks programming). The RESET pin supports both reset functionality and 12 V override of boot block lockout - a feature absent in N-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), enabling full boot loader + configuration storage in single device |
| Read Access Time | 90 ns - meets timing for 11 MHz bus interfaces without wait states |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3 V system rails; no 5 V support required |
| Erase Time | 10 seconds typical for full chip erase - enables field firmware updates with predictable latency |
| Programming Speed | 30 µs/byte typical - allows rapid patching of small code/data segments |
| Endurance | 10,000 write/erase cycles - sufficient for infrequent firmware upgrades over product lifetime |
| Standby Current | 50 µA CMOS - supports low-power sleep modes in battery-backed applications |
Pinout & Package
AT49LV002T-90PC is supplied in a 32-lead, 0.600" wide plastic dual in-line package (PDIP), designated as package code 32P6. Pin 1 is index corner, with pin 16 as GND and pin 32 as VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 map directly to memory location bits |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; supports true read-modify-write operations during programming |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus tristate to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Reset Input | Active-low reset; also accepts 12 V for boot block lockout override - critical for secure firmware recovery |
| GND | Ground | Pin 16 reference plane; decoupling capacitor placement near this pin minimizes noise during erase/write |
| VCC | Power Supply | Pin 32 supplies 3.0–3.6 V; requires local 0.1 µF ceramic bypass capacitor per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte protected region (3C000H–3FFFFH) prevents accidental overwrite of bootloader; enabled via 6-byte command sequence |
| DATA Polling & Toggle Bit | Real-time programming status feedback via I/O7 complement or I/O6 toggling - eliminates need for fixed delay timers in host firmware |
| Sector Erase Flexibility | Independent erasure of parameter blocks (8K each) and main memory blocks (96K/128K) enables modular firmware updates without full chip erase |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit prevent spurious writes - essential for robust operation in electrically noisy industrial environments |
| 12 V RESET Override | Enables reprogramming of locked boot block during recovery procedures - unique to T-suffix devices and critical for field serviceability |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Modem Boot Code |
|---|---|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers subject to frequent environmental stress and long service life. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space; accessed at power-on reset using standard EPROM timing. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; 50 µA standby current extends uptime in unpowered standby intervals. | Use Scenario: Holding initialization code and protocol stacks in dial-up modems and ISDN terminal adapters deployed in telecom central offices. IC Role / Device Role / Timing Role: Memory-mapped instruction/data storage interfaced to Z80 or 8051 derivatives; 90 ns access satisfies 11 MHz bus timing. Use Value: Sector architecture allows independent update of modem DSP firmware without disturbing AT command interpreter stored in parameter blocks. |
| Medical Device Configuration EEPROM Replacement | Automotive Diagnostic Tool Calibration Data |
Use Scenario: Replacing serial EEPROM in portable diagnostic equipment where higher density and faster write are needed for calibration data logging. IC Role / Device Role / Timing Role: Byte-programmable nonvolatile storage accessed via parallel bus; erased/rewritten during service calibration cycles. Use Value: 30 µs/byte programming enables real-time calibration capture; hardware write protection prevents corruption during brown-out events. | Use Scenario: Storing vehicle-specific calibration tables and diagnostic routines in handheld OBD-II scanners used by service technicians. IC Role / Device Role / Timing Role: Standalone Flash memory holding flashable firmware images and VIN-locked calibration maps. Use Value: 12 V RESET override allows technician-initiated bootloader recovery when calibration data becomes corrupted - no chip replacement required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002T-90PC | 2.7–3.6 V supply range; includes Battery-Voltage™ operation down to 2.7 V | Better suited for battery-powered or wide-input-range systems where voltage may dip below 3.0 V | Select when system VCC can fall below 3.0 V; otherwise AT49LV002T-90PC offers tighter 3.0–3.6 V regulation margin |
| AM29LV002BT-90EC | Same 2 Mbit density, 90 ns access, and 32-pin PDIP; uses AMD-compatible command set and 12 V RESET override | Direct software compatibility with existing AMD-based firmware loaders and programming tools | Choose when migrating from AMD platforms or requiring vendor-agnostic toolchain support |
Compared with AT49BV002T-90PC and AM29LV002BT-90EC, the AT49LV002T-90PC provides optimal balance of voltage margin, proven bootloader security, and industry-standard timing - making it preferred for cost-sensitive, 3.3 V-only industrial designs where 2.7 V operation is unnecessary.
Availability
AT49LV002T-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy telecom modem boot code, and medical device configuration EEPROM replacement requiring stable component supply and long-term obsolescence management.
Supply support for AT49LV002T-90PC 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 memory products including the AT49LV series. The device is manufactured using advanced nonvolatile CMOS process technology.
The AT49LV002T-90PC belongs to Atmel's Battery-Voltage™ Flash memory family, designed specifically for reliable in-system reprogramming in resource-constrained embedded systems where 3.3 V operation and sector-level data protection are mandatory.
FAQ
What is the boot block address range for AT49LV002T-90PC?
The boot block for AT49LV002T-90PC occupies memory addresses 3C000H to 3FFFFH (16 Kbytes). This differs from non-T variants (e.g., AT49LV002N), which locate the boot block at 00000H–03FFFH. The relocated boot block simplifies memory mapping in systems where lower address space is reserved for RAM or peripherals, and is confirmed in the device's block diagram and command definitions section of the datasheet.
Does AT49LV002T-90PC support 12 V programming on the RESET pin?
Yes, AT49LV002T-90PC supports 12 V ± 0.5 V applied to the RESET pin to override the boot block programming lockout feature during chip erase, sector erase, or byte programming. This capability is explicitly documented in the "Boot Block Programming Lockout Override" section and is exclusive to T-suffix devices - it is not available on N-suffix variants like AT49LV002N-90PC.
What package type is used for AT49LV002T-90PC?
AT49LV002T-90PC uses a 32-lead, 0.600" wide plastic dual in-line package (PDIP), designated as package code 32P6. This through-hole package is suitable for prototyping, legacy board assembly, and applications requiring mechanical robustness and serviceability - distinct from surface-mount alternatives like TSOP or VSOP offered in other ordering options.
How does DATA polling work on AT49LV002T-90PC?
During byte programming, AT49LV002T-90PC asserts the complement of the loaded data on I/O7. Once programming completes, true data appears on all outputs. Host firmware can poll I/O7 after initiating a write - when the bit stops toggling and matches expected value, programming is confirmed. This eliminates fixed delays and improves system responsiveness, and is fully supported per AC characteristics table and Data Polling Waveforms in the datasheet.
Is AT49LV002T-90PC compatible with standard EPROM timing and interface?
Yes, AT49LV002T-90PC uses standard EPROM-compatible control signals (CE, OE, WE) and timing - reads occur when CE and OE are low and WE is high. Its tACC (90 ns), tCE (90 ns), and tOE (max 40 ns) align with common 11 MHz microcontroller buses. No special timing generators or level shifters are required, enabling drop-in replacement for older EPROMs in legacy designs where in-system reprogrammability is added.
AT49LV002T-90PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49LV002T-90PC FAQ
1.How can I place an order for AT49LV002T-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002T-90PC 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 AT49LV002T-90PC reliable?
The price and inventory of AT49LV002T-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002T-90PC is usually 5 days.
3.What payment methods are accepted for AT49LV002T-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002T-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002T-90PC?
AT49LV002T-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002T-90PC 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 AT49LV002T-90PC?
For technical support, including AT49LV002T-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002T-90PC requirements.
6.How does Aetrix verify that AT49LV002T-90PC is sourced from the original manufacturer or authorized distributors?
All AT49LV002T-90PC 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 AT49LV002T-90PC meets industry standards.
7.What is the process for return or replacement of AT49LV002T-90PC?
All AT49LV002T-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002T-90PC, 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 AT49LV002T-90PC part is unused and in its original packaging.
Return procedure for AT49LV002T-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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