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Microchip Technology AT49LV001-90JI
- Part No.:
- AT49LV001-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LV001-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
AT49LV001-90JI from Microchip Technology (formerly Atmel) is a 1 Mbit (128K × 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 70 ns read access time, 10-second chip erase, byte-programming at 30 µs/byte, and features hardware data protection, DATA polling, and a 16-Kbyte boot block with programmable lockout.
For engineers reviewing the AT49LV001-90JI datasheet, AT49LV001-90JI pinout, AT49LV001-90JI application, or AT49LV001-90JI equivalent, key selection considerations include industrial temperature support (−40°C to +85°C), PLCC-32 package compatibility, boot-sector write protection, sector-based erase architecture, and 3.0 V-only command-set operation without high-voltage programming inputs.
Technical Context
The AT49LV001-90JI implements a sector-architected Flash array comprising one 16-Kbyte boot block, two 8-Kbyte parameter blocks, and two main memory blocks (32K and 64K bytes). Its internal control logic executes standard EPROM-like read cycles and software-commanded erase/program operations using address-latched WE/CE sequences.
It supports three primary operational modes: Read (CE/OE low, WE high), Byte Program (CE low, OE high, WE low), and Erase (multi-cycle command sequence). Hardware safeguards include VCC sense (<1.8 V inhibits programming), noise filtering on WE/CE (<15 ns pulses ignored), and automatic toggle-bit/DATA polling for cycle completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for firmware boot code and configuration data in 8-bit microcontroller systems. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with modern 3.3 V logic rails and eliminates need for 5 V or 12 V programming supplies. |
| Read Access Time | 90 ns - enables direct interface with medium-speed 8-bit MCUs (e.g., 8051 derivatives) without wait states. |
| Erase Cycle Time | 10 seconds (typical) - allows full-chip or sector-level erasure in-system without external programmers. |
| Byte Programming Time | 30 µs typical - supports field-upgradable parameter tables and runtime patching of small code segments. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - enables deterministic software-controlled timing without fixed delays. |
| Write Endurance | 10,000 program/erase cycles - suitable for applications requiring infrequent firmware updates over product lifetime. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control, instrumentation, and telecom equipment. |
Pinout & Package
AT49LV001-90JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-leads. Pin 1 is index corner; pin 32 is VCC. DC and NC pins are not connected internally and must be left unconnected on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 required for accessing upper 64K block. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification operations; TTL-compatible I/O levels. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state to prevent bus contention. |
| OE | Output Enable | Active-low output gate; used with CE to implement dual-line control for flexible bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V override enables boot-block reprogramming. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; decoupling capacitor required near pin for stable read/write operation. |
| GND | Ground Reference | System ground return; must be low-inductance connection to minimize noise during erase/program pulses. |
| DC / NC | No Connect | Pins 4 and 31 (PLCC top view) are unconnected - must remain floating per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables secure firmware boot code storage (00000H–03FFFH) that remains protected while other sectors are updated - critical for fail-safe bootloader integrity. |
| 3.0 V–Only Command Set | Eliminates need for external 12 V programming voltage; simplifies system power design and supports true in-circuit reprogramming via MCU GPIOs. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line interlock prevent accidental writes - reduces risk of corruption during brown-out or EMI events. |
| DATA Polling & Toggle Bit | Provides real-time, software-pollable status of program/erase completion - avoids fixed timeout delays and improves system responsiveness. |
| Low Power Standby | 50 µA CMOS standby current - extends battery life in portable or always-on embedded devices with infrequent Flash access. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed read access ≤90 ns and industrial temperature operation (−40°C to +85°C). Use Value: Enables field firmware upgrades without hardware rework; boot block lockout prevents accidental overwrite of safety-critical startup routines. | Use Scenario: Retaining device-specific calibration coefficients, user preferences, and regulatory audit logs in portable diagnostic instruments. IC Role / Device Role / Timing Role: Parameter storage with byte-level programmability and hardware write protection against power-loss corruption. Use Value: Ensures data integrity during battery swaps or unexpected shutdowns; 10,000-cycle endurance supports multi-year service life. |
| Telecom Base Station Boot Loader | Automotive Body Control Module Code Storage |
Use Scenario: Hosting secure boot loader code in wireless infrastructure equipment where remote firmware updates are routine and reliability is mission-critical. IC Role / Device Role / Timing Role: Protected boot memory with 16-Kbyte lockable sector and 12 V RESET override for recovery procedures. Use Value: Prevents bricking during OTA updates; sector erase allows selective reprogramming of application partitions without touching boot code. | Use Scenario: Storing vehicle-specific configuration maps and diagnostic event logs in automotive body control units operating under engine-bay thermal stress. IC Role / Device Role / Timing Role: Industrial-grade Flash memory with −40°C to +85°C qualification and hardware data protection against electrical transients. Use Value: Meets AEC-Q100 stress requirements for non-safety-critical ECUs; low 50 µA standby current minimizes parasitic drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-90-4C-NHE | 3.0–3.6 V supply, 90 ns access, 1 Mbit density, PLCC-32 package - identical timing and pinout but uses different command set and lacks RESET-based boot override. | No 12 V RESET override for boot block; relies solely on software lock/unlock - less robust for recovery-critical systems. | Select if command-set compatibility with existing SST39VF firmware is required and boot override is unnecessary. |
| MX29LV001CTTI-90G | 3.0–3.6 V, 90 ns, 1 Mbit, PLCC-32 - supports CFI query but has no dedicated boot block lockout feature; sector sizes differ (8 × 16K). | Boot code protection requires external logic or software management; no hardware-enforced boot sector write disable. | Choose when CFI-compliant auto-detection is needed and boot security is handled at system level rather than silicon level. |
Compared with SST39VF010-90-4C-NHE and MX29LV001CTTI-90G, the AT49LV001-90JI uniquely integrates hardware-enforced boot block lockout with 12 V RESET override, delivering stronger firmware integrity assurance for safety- or recovery-sensitive embedded designs.
Availability
AT49LV001-90JI is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, telecom infrastructure, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49LV001-90JI 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 legacy Flash memory product lines including the AT49LV series. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for embedded applications.
The AT49LV001-90JI belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for reliable, low-voltage in-system reprogrammability in space-constrained industrial and automotive systems where 5 V programming is impractical.
FAQ
What is the operating voltage range for the AT49LV001-90JI?
The AT49LV001-90JI operates from 3.0 V to 3.6 V for both read and write functions. It does not support 2.7 V operation - that range applies only to the BV variant (AT49BV001). This 3.0–3.6 V window ensures compatibility with standard 3.3 V logic families and eliminates need for level-shifting circuitry when interfacing with modern MCUs. Operation outside this range may cause data corruption or failure to execute commands.
Does the AT49LV001-90JI support boot block protection, and how is it enabled?
Yes, the AT49LV001-90JI includes a 16-Kbyte boot block (addresses 00000H–03FFFH) with programmable lockout. Protection is enabled by issuing a six-cycle command sequence (5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/40H). Once activated, the boot block cannot be erased or programmed at ≤5.5 V. The AT49LV001-90JI retains the RESET pin 12 V override capability for emergency reprogramming.
What package type is used for the AT49LV001-90JI, and what are its key mechanical features?
The AT49LV001-90JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package (suffix "J"). It measures 11.43 mm × 13.97 mm with J-shaped leads, offers excellent thermal performance, and is socket-compatible with industry-standard PLCC-32 sockets. Pin 1 is marked by a notch; pins 4 and 31 are designated DC/NC and must remain unconnected. This package supports reflow and wave soldering per JEDEC standards.
How does the AT49LV001-90JI indicate completion of a byte programming cycle?
The AT49LV001-90JI provides two hardware methods: DATA polling and Toggle Bit. During programming, reading the last written address returns the complement of the data on I/O7 until completion, then true data. Alternatively, I/O6 toggles between 0 and 1 during active programming and stops toggling once complete. Both mechanisms allow precise, software-driven synchronization without fixed timing delays - essential for deterministic embedded firmware execution.
Is the AT49LV001-90JI suitable for industrial temperature applications?
Yes, the "I" suffix in AT49LV001-90JI denotes industrial temperature grade (−40°C to +85°C). This rating is validated per AC/DC specifications in the datasheet, including 90 ns read access, 50 µA standby current, and full functionality across the range. It is explicitly qualified for use in programmable logic controllers, industrial HMIs, and factory automation equipment where ambient conditions exceed commercial-grade limits.
AT49LV001-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K 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:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49LV001-90JI FAQ
1.How can I place an order for AT49LV001-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV001-90JI 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 AT49LV001-90JI reliable?
The price and inventory of AT49LV001-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV001-90JI is usually 5 days.
3.What payment methods are accepted for AT49LV001-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV001-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV001-90JI?
AT49LV001-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV001-90JI 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 AT49LV001-90JI?
For technical support, including AT49LV001-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV001-90JI requirements.
6.How does Aetrix verify that AT49LV001-90JI is sourced from the original manufacturer or authorized distributors?
All AT49LV001-90JI 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 AT49LV001-90JI meets industry standards.
7.What is the process for return or replacement of AT49LV001-90JI?
All AT49LV001-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV001-90JI, 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 AT49LV001-90JI part is unused and in its original packaging.
Return procedure for AT49LV001-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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