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Microchip Technology AT49LV002T-90PI
- Part No.:
- AT49LV002T-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49LV002T-90PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LV002T-90PI 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 features 70 ns read access time, 10-second chip erase, byte-programmable architecture with sector protection, and operates across the industrial temperature range (−40°C to +85°C) in a 32-pin PDIP package.
For engineers reviewing the AT49LV002T-90PI datasheet, AT49LV002T-90PI pinout, AT49LV002T-90PI application, or AT49LV002T-90PI equivalent, key selection criteria include boot-block lockout capability (3C000H–3FFFFH), DATA polling/Toggle Bit end-of-write detection, hardware reset-based boot override (12 V on RESET), and compatibility with standard 5 V–compatible command sequences despite 3.3 V operation.
Technical Context
This device implements a command-register-based Flash architecture with six-byte software command sequences for chip/sector erase and byte programming. Its sector layout includes one 16 KB boot block (address 3C000H–3FFFFH), two 8 KB parameter blocks, and two main memory blocks (96 KB and 128 KB), enabling selective firmware updates without disturbing secure boot code.
Hardware data protection includes VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line gating (OE low, CE high, or WE high disables writes). The RESET pin supports both standard reset and 12 V–triggered boot-block reprogramming override - a feature absent in N-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - sufficient for full bootloader + configuration data in space-constrained MCU designs. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3 V logic systems without level-shifting; no 5 V required for programming. |
| Read Access Time | 90 ns - enables direct execution (XIP) from Flash in mid-speed microcontrollers without wait states. |
| Erase Time | 10 seconds (chip erase) - deterministic timing allows predictable firmware update windows in field-deployed devices. |
| Byte Programming | 30 µs typical - supports fine-grained parameter updates without erasing entire sectors. |
| 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 | 16 KB (3C000H–3FFFFH) with lockout enable/disable via command sequence - isolates immutable boot code from runtime updates. |
Pinout & Package
AT49LV002T-90PI is supplied in a 32-pin Plastic Dual In-line Package (PDIP), 0.600" wide (package code 32P6), with through-hole mounting and industry-standard footprint.
| 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 locations including boot block (3C000H–3FFFFH). |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; I/O7 used for DATA polling, I/O6 for Toggle Bit status indication during program/erase. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; dual-control prevents bus contention. |
| OE | Output Enable | Active-low output gate; controls data bus tristate independently of CE, enabling flexible memory-mapped or I/O-mapped interfacing. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing; critical for issuing 6-cycle erase/lockout commands. |
| RESET | Reset Input | Active-low system reset; applying 12 V ±0.5 V enables boot block reprogramming even when lockout is active - unique to T-suffix devices. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; powers internal charge pumps and logic; VCC sense circuitry disables writes if voltage drops below ~1.8 V. |
| GND | Ground | Reference for all I/O and internal circuitry; decoupling capacitor placement near this pin is critical for stable erase/program operations. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout Override | 12 V applied to RESET pin during operation unlocks protected 16 KB boot sector (3C000H–3FFFFH) - enables field recovery of corrupted boot code without device replacement. |
| Software Command Architecture | Six-byte command sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H → …) executed via standard microprocessor write cycles - no external high-voltage generator needed. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns), and control-line interlock (OE/CE/WE states) prevent accidental writes during power transients or EMI events - critical for automotive/industrial reliability. |
| Two-Mode End-of-Write Detection | Simultaneous support for DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - gives firmware designers flexibility in interrupt-driven vs. polling-based update routines. |
| Sector-Erasable Memory Map | Dedicated 8 KB parameter blocks (3A000H–3BFFFH, 38000H–39FFFH) allow independent calibration/data storage updates without affecting main application code in 20000H–37FFFH or boot code in 3C000H–3FFFFH. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing firmware images and field-upgradable logic for programmable logic controllers operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed 10,000 write cycles and −40°C to +85°C operation; 90 ns read access supports real-time scan-cycle execution. Use Value: Boot block lockout (3C000H–3FFFFH) preserves core safety logic while allowing parameter and application updates - reducing certification overhead for modified firmware releases. |
Use Scenario: Holding calibrated sensor offsets, user preferences, and regulatory-compliant audit logs in portable diagnostic equipment requiring traceable data integrity. IC Role / Device Role / Timing Role: Parameter block (3A000H–3BFFFH, 38000H–39FFFH) stores infrequently changed calibration data; sector-erase isolation prevents corruption of adjacent operational code. Use Value: Hardware data protection (VCC sense, noise filtering) ensures write operations only occur under stable power - meeting IEC 62304 software safety requirements. |
| Automotive Body Control Module (BCM) | Network Router Bootloader Storage |
Use Scenario: Hosting boot code and vehicle-specific configuration tables in body control units exposed to automotive-grade thermal and EMI stress. IC Role / Device Role / Timing Role: Boot block (3C000H–3FFFFH) holds immutable startup routines; RESET pin 12 V override enables dealership-level boot recovery without specialized programmers. Use Value: 10-second chip erase and 30 µs/byte programming enable fast over-the-air (OTA) firmware patching within tight vehicle maintenance windows. |
Use Scenario: Storing primary bootloader and fail-safe recovery image in enterprise-grade network infrastructure where uptime and secure boot are mandatory. IC Role / Device Role / Timing Role: Dual main memory blocks (20000H–37FFFH and 00000H–1FFFFH) support A/B firmware partitioning; sector erase enables atomic updates without service interruption. Use Value: DATA polling and Toggle Bit provide deterministic write completion signaling - eliminating race conditions in multi-threaded bootloader update managers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49LV002-90PI | No RESET-based boot override; boot block lockout is permanent once enabled (no 12 V unlock path); same 3.0–3.6 V supply and 90 ns timing. | Lacks field-recoverable boot code capability; suitable only where boot firmware never requires post-deployment modification. | Select only if boot code is truly immutable and cost sensitivity outweighs field-serviceability needs. |
| SST39VF020-90-4C-NHE | 3.3 V-only, 2 Mbit, 90 ns access; uses different command set (single-byte unlock); no dedicated boot block - entire array erasable in 10 ms (vs. 10 s here). | Higher endurance (100K cycles), faster erase, but lacks hardware-protected boot region - requires software-managed partitioning. | Prefer for high-frequency parameter logging; avoid where certified boot integrity is mandated. |
Compared with AT49LV002-90PI, the AT49LV002T-90PI adds critical field-serviceability via 12 V RESET override; compared with SST39VF020, it trades raw speed for hardware-enforced boot security and deterministic erase timing - making it superior for safety-critical embedded boot storage.
Availability
AT49LV002T-90PI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive electronics requiring stable component supply with long-term lifecycle assurance and consistent parametric performance.
Supply support for AT49LV002T-90PI 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 products, including manufacturing, documentation, and technical assistance.
The AT49LV002T series belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for reliable in-system reprogramming in 3.3 V embedded systems where code integrity, sector protection, and field-upgradeability are essential.
FAQ
What is the boot block address range for AT49LV002T-90PI?
The boot block for AT49LV002T-90PI occupies addresses 3C000H to 3FFFFH (16 KB). This differs from non-T variants (e.g., AT49LV002-90PI), whose boot block is at 00000H–03FFFH. The relocated boot sector simplifies memory mapping in systems using higher-addressed code regions and is explicitly defined in the AT49LV002T datasheet revision 0982D.
Does AT49LV002T-90PI support 5 V tolerant inputs?
AT49LV002T-90PI does not support 5 V tolerant inputs. All inputs (CE, OE, WE, A0–A17, RESET) have absolute maximum ratings of −0.6 V to +6.25 V, but DC operating specifications require VIH ≥ 2.0 V and VIL ≤ 0.6 V referenced to VCC = 3.0–3.6 V. Interfacing with 5 V microcontrollers requires level translation on control/address lines.
How is boot block lockout enabled on AT49LV002T-90PI?
Boot block lockout on AT49LV002T-90PI is enabled by executing a six-cycle command sequence: write AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H. Once activated, programming/erasure of the 3C000H–3FFFFH region is blocked for VCC ≤ 5.5 V - confirmed in the "Boot Block Programming Lockout" section of the datasheet.
Can AT49LV002T-90PI be erased sector-by-sector?
Yes, AT49LV002T-90PI supports sector erase for both 8 KB parameter blocks (3A000H–3BFFFH and 38000H–39FFFH) and the two main memory blocks (20000H–37FFFH and 00000H–1FFFFH). Each sector erase uses the same six-cycle command sequence with sector-specific address loading, as detailed in the "Sector Erase" subsection of the datasheet.
What is the standby current specification for AT49LV002T-90PI?
AT49LV002T-90PI draws 50 µA CMOS standby current (ISB1) when CE is held at VCC − 0.3 V to VCC, and 3 mA TTL standby current (ISB2) when CE is at 2.0 V to VCC. These values are measured across the industrial temperature range (−40°C to +85°C) and are specified in the DC Characteristics table of the official datasheet.
AT49LV002T-90PI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49LV002T-90PI FAQ
1.How can I place an order for AT49LV002T-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002T-90PI 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-90PI reliable?
The price and inventory of AT49LV002T-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002T-90PI is usually 5 days.
3.What payment methods are accepted for AT49LV002T-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002T-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002T-90PI?
AT49LV002T-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002T-90PI 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-90PI?
For technical support, including AT49LV002T-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002T-90PI requirements.
6.How does Aetrix verify that AT49LV002T-90PI is sourced from the original manufacturer or authorized distributors?
All AT49LV002T-90PI 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-90PI meets industry standards.
7.What is the process for return or replacement of AT49LV002T-90PI?
All AT49LV002T-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002T-90PI, 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-90PI part is unused and in its original packaging.
Return procedure for AT49LV002T-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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