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Microchip Technology AT49LV002T-12PC
- Part No.:
- AT49LV002T-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49LV002T-12PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LV002T-12PC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 3.0–3.6 V Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 120 ns read access time, supports byte-by-byte programming (30 µs/byte typical), features sector-erase architecture with a 16 KB boot block at address 3C000H–3FFFFH, and is commonly deployed in firmware update-capable industrial controllers.
For engineers reviewing the AT49LV002T-12PC datasheet, AT49LV002T-12PC pinout, AT49LV002T-12PC application, or AT49LV002T-12PC equivalent, key selection considerations include its 32-pin PDIP package, boot-block lockout capability with 12 V RESET override, DATA polling/Toggle Bit end-of-program detection, and compatibility with standard EPROM-like CE/OE/WE control timing.
Technical Context
This device implements a software-command-controlled Flash architecture with six-cycle command sequences for chip erase, sector erase, byte programming, and boot-block lockout enable. Its internal logic interprets specific address/data patterns (e.g., 5555H/AAH, 2AAAH/55H) to enter functional modes without requiring external high-voltage programming signals.
The memory array is partitioned into one 16 KB boot block (3C000H–3FFFFH), two 8 KB parameter blocks (3A000H–3BFFFH and 38000H–39FFFH), and two main memory blocks (20000H–37FFFH and 00000H–1FFFFH), enabling selective erasure and firmware modularization. Hardware data protection includes VCC sense, noise filtering on WE/CE, and control-line inhibit logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - supports full firmware image storage for 8-bit MCUs. |
| Read Access Time | 120 ns - determines maximum bus clock rate for direct memory-mapped execution in legacy 8051 or Z80-based systems. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with regulated 3.3 V system rails; no 5 V support required. |
| Byte Programming Time | 30 µs typical - enables fast field updates of configuration parameters or calibration data. |
| Erase Cycle Time | 10 seconds max for full chip erase - allows predictable in-system reprogramming windows during maintenance cycles. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed timing delays in host firmware. |
| Boot Block Protection | 16 KB region (3C000H–3FFFFH) with lockout enabled via 6-cycle command; override possible with 12 V on RESET - secures bootloader integrity while permitting application updates. |
Pinout & Package
AT49LV002T-12PC uses a 32-lead, 0.600" wide plastic dual in-line package (PDIP), pin-compatible with industry-standard 28-pin EPROM footprints when using socket adapters. Pin functions are electrically identical across PLCC, TSOP, and VSOP variants of the same speed grade.
| 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 within 8-bit data bus. |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; latched on rising edge of WE or CE during programming; tri-stated when CE or OE high. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; enables bus contention avoidance. |
| OE | Output Enable | Active-low output control; used with CE to gate data output without affecting internal state - critical for shared-bus arbitration. |
| WE | Write Enable | Active-low write strobe; falling edge latches address; rising edge latches data during programming/erase command cycles. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces outputs to high-Z; 12 V input enables boot block reprogramming even when lockout is active. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; powers core logic and charge pumps; internal regulation ensures consistent programming voltage. |
| GND | Ground | Reference return path for all I/O and core circuitry; requires low-impedance connection to minimize noise during erase/program pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Architecture | Independent erasure of 16 KB boot block, two 8 KB parameter blocks, and two main memory blocks (96 KB + 128 KB) - enables granular firmware updates without full chip reflash. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibit (OE low/CE high/WE high blocks writes) - prevents accidental corruption during power transients or EMI events. |
| Boot Block Lockout with Override | 16 KB boot sector (3C000H–3FFFFH) programmable lockout activated by 6-cycle command; 12 V on RESET pin restores reprogrammability - balances security and field serviceability. |
| DATA Polling & Toggle Bit | I/O7 returns complement of programmed data until completion; I/O6 toggles during erase/program - enables host MCU to poll status without fixed timeouts or external clocks. |
| Low Power Operation | 25 mA active current and 50 µA CMOS standby current - suitable for battery-backed or energy-constrained industrial monitoring nodes. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing firmware images and runtime configuration tables in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; 120 ns read access supports direct execution from memory in cycle-count-critical ladder logic scanning. Use Value: Sector erase allows updating only modified function blocks without disrupting operational safety firmware stored in the protected boot block. |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter storage with hardware write protection; DATA polling ensures deterministic update completion before device power-down. Use Value: 50 µA standby current extends battery life between calibrations; boot block lockout prevents accidental overwrite of FDA-mandated bootloader code. |
| Automotive Body Control Module | Legacy Industrial HMI Display |
Use Scenario: Holding lighting control algorithms and CAN message lookup tables in vehicle body electronics modules. IC Role / Device Role / Timing Role: Code and data storage with extended temperature operation (-40°C to +85°C); RESET pin override enables dealer-level recalibration under hood conditions. Use Value: 10,000 write cycles exceed lifetime requirement for infrequent firmware patches; 3.3 V compatibility avoids level-shifting in modern automotive domains. |
Use Scenario: Replacing obsolete 27C256 EPROMs in factory-floor HMIs requiring firmware patching without board removal. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical PDIP-32 footprint and CE/OE/WE interface timing. Use Value: 120 ns access matches legacy 27C256-12 timing; sector architecture permits partial updates of display fonts or language strings without full reprogramming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002T-12PC | 2.7–3.6 V supply range; includes Battery-Voltage™ operation down to 2.7 V; higher ICC active current (50 mA vs. 25 mA) | Supports wider voltage margin in unregulated battery systems; less suitable for ultra-low-power standby designs | Select when operating from nominal 3.0 V sources with potential brownout risk. |
| SST39VF020-120-4C-NHE | 3.0–3.6 V supply; 120 ns access; 2 Mbit density; TTL-compatible inputs; no RESET pin override for boot block | Lacks 12 V boot block unlock; uses different command set (no 5555H/2AAAH sequences); requires separate VPP pin for programming in older versions | Choose for simplified command interface where boot block reprogramming is never required post-deployment. |
Compared with AT49BV002T-12PC and SST39VF020-120-4C-NHE, the AT49LV002T-12PC offers lower active current and guaranteed 3.0–3.6 V operation - making it optimal for stable 3.3 V rail designs prioritizing power efficiency over voltage flexibility or alternate command compatibility.
Availability
AT49LV002T-12PC 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, long-term lifecycle support, and traceable sourcing.
Supply support for AT49LV002T-12PC 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, and nonvolatile memory solutions for industrial and automotive markets.
The AT49LV002T-12PC belongs to Atmel's legacy parallel-interface Flash memory product line, designed specifically for drop-in replacement of EPROMs in 8-bit embedded systems requiring in-system reprogrammability without high-voltage programming circuits.
FAQ
What is the correct power supply range for AT49LV002T-12PC?
The AT49LV002T-12PC operates strictly within 3.0 V to 3.6 V. Unlike the AT49BV002T variant, it does not support the 2.7 V lower limit. Supplying below 3.0 V may inhibit programming or cause read instability, and exceeding 3.6 V risks permanent damage per Absolute Maximum Ratings.
How is the boot block protected on AT49LV002T-12PC, and can it be reprogrammed after lockout?
The AT49LV002T-12PC boot block (3C000H–3FFFFH) is protected via a 6-cycle command sequence that enables programming lockout. Once enabled, reprogramming is blocked for inputs ≤5.5 V. However, applying 12.0 V ±0.5 V to the RESET pin during a byte program or sector erase operation overrides the lockout, allowing secure bootloader updates in service environments.
Does AT49LV002T-12PC support standard EPROM timing and pinout?
Yes, the AT49LV002T-12PC uses identical CE/OE/WE control signaling and 32-pin PDIP pinout as industry-standard 27C256 EPROMs. Its 120 ns access time matches the -12 speed grade of those devices, enabling direct socket replacement in legacy designs without PCB modification or timing adjustments.
What methods detect completion of programming or erase cycles on AT49LV002T-12PC?
The AT49LV002T-12PC provides two hardware-supported detection methods: DATA polling (I/O7 returns complement of loaded data until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during operation). Both allow the host MCU to poll status actively without fixed delays or external timers.
What is the endurance rating and data retention specification for AT49LV002T-12PC?
The AT49LV002T-12PC guarantees a minimum of 10,000 program/erase cycles per memory location and 10 years of data retention at 85°C. These values are specified under commercial temperature conditions (0°C to 70°C) and assume proper command sequencing and voltage compliance per the datasheet.
AT49LV002T-12PC 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:
- 120 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-12PC FAQ
1.How can I place an order for AT49LV002T-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002T-12PC 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-12PC reliable?
The price and inventory of AT49LV002T-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002T-12PC is usually 5 days.
3.What payment methods are accepted for AT49LV002T-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002T-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002T-12PC?
AT49LV002T-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002T-12PC 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-12PC?
For technical support, including AT49LV002T-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002T-12PC requirements.
6.How does Aetrix verify that AT49LV002T-12PC is sourced from the original manufacturer or authorized distributors?
All AT49LV002T-12PC 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-12PC meets industry standards.
7.What is the process for return or replacement of AT49LV002T-12PC?
All AT49LV002T-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002T-12PC, 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-12PC part is unused and in its original packaging.
Return procedure for AT49LV002T-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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