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Microchip Technology AT49LV040-90VI
- Part No.:
- AT49LV040-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49LV040-90VI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
AT49LV040-90VI from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating at 3.0V–3.6V, featuring 70 ns read access time, 10-second chip erase, and 30 µs/byte programming. It integrates a 16 KB boot block with hardware lockout and supports in-system reprogramming without high-voltage inputs.
For engineers reviewing the AT49LV040-90VI datasheet, AT49LV040-90VI pinout, AT49LV040-90VI application, or AT49LV040-90VI equivalent, this device serves as a drop-in replacement for legacy 5V EPROMs in embedded boot code storage, industrial controller firmware, and legacy BIOS modules requiring low-voltage operation and hardware write protection.
Technical Context
The AT49LV040-90VI implements a CMOS-based NOR Flash architecture with dual-line control (CE/OE) enabling bus contention avoidance during read cycles. Its internal command register executes software-controlled operations including chip erase, byte programming, and boot block lockout via six-byte address/data sequences.
It features two end-of-operation detection methods-Data Polling (I/O7 complement toggle) and Toggle Bit (I/O6 state flip)-and hardware data protection via VCC sense (<1.8V inhibit), noise filtering (<15 ns pulse rejection), and control-line gating (OE low/CE high/WE high disables programming).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits |
| Supply Voltage | 3.0V to 3.6V - enables direct replacement of 5V EPROMs using existing 3.3V logic rails |
| Read Access Time | 90 ns - meets timing requirements for 11 MHz system buses without wait states |
| Chip Erase Time | 10 seconds - enables full-field firmware updates within deterministic maintenance windows |
| Byte Programming Time | 30 µs typical - supports real-time patching of small configuration tables in field-deployed units |
| Boot Block Size | 16 KB (00000H–03FFFH) - isolates critical boot loader code from accidental overwrites |
| Endurance | 10,000 program/erase cycles - qualifies for industrial control applications with infrequent firmware updates |
| Standby Current | 50 µA CMOS - reduces power budget in battery-backed systems during sleep modes |
Pinout & Package
AT49LV040-90VI is available in 32-lead TSOP (8 × 14 mm, package code 32V) and PLCC (32J) packages. The 32V variant is optimized for space-constrained PCB layouts in embedded controllers and communication modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A15 used for boot block (00000H–03FFFH) |
| CE | Chip Enable | Active-low global enable; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus drive to prevent contention when shared with other peripherals |
| WE | Write Enable | Active-low programming control; latches address/data on falling edge for byte programming |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; I/O7 used for Data Polling, I/O6 for Toggle Bit status monitoring |
| VCC | Power Supply | 3.0V–3.6V input; internal voltage regulator ensures stable core operation across supply range |
| GND | Ground Reference | Common return path for all signals; decoupling capacitor required within 10 mm of VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.0V–3.6V Operation | Eliminates need for 5V/12V programming supplies - simplifies power design and enables direct integration with 3.3V microcontrollers |
| Hardware Boot Block Lockout | Permanent write protection of 16 KB region (00000H–03FFFH) after activation - prevents corruption of bootloader during field firmware upgrades |
| Data Polling & Toggle Bit | Dual asynchronous status reporting (I/O7 complement, I/O6 toggle) - allows host CPU to poll completion without fixed timeouts or external clocks |
| Software Command Set | Six-byte command sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) - enables full erase/program/lock functions using standard memory-mapped I/O |
| VCC Sense Protection | Automatic programming disable below 1.8V - prevents bit corruption during brown-out conditions or power ramp-up |
Applications
| Industrial PLC Firmware Storage | Legacy BIOS Code Retention |
|---|---|
Use Scenario: Storing ladder logic firmware in programmable logic controllers deployed in factory automation environments with wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization routines and runtime code executed directly by the PLC's microcontroller upon power-up. Use Value: Hardware boot block lockout ensures bootloader integrity across 10,000+ field updates; 90 ns access time supports deterministic scan cycle execution. | Use Scenario: Replacing obsolete 27C040 EPROMs in legacy PC motherboards where 5V-to-3.3V level translation is impractical. IC Role / Device Role / Timing Role: Pin-compatible Flash memory providing identical 32-pin DIP footprint emulation via TSOP-to-DIP adapter, delivering BIOS code to x86 processors. Use Value: Single 3.3V supply eliminates need for external voltage translators; 10-second chip erase enables rapid BIOS recovery in service depots. |
| Embedded Network Router Bootloader | Medical Device Configuration Storage |
Use Scenario: Holding secure bootloader code in Ethernet/IP routers requiring FIPS-compliant firmware validation before loading application images. IC Role / Device Role / Timing Role: Isolated boot sector memory storing cryptographic keys and signature verification routines executed before main OS load. Use Value: Permanent boot block lockout prevents tampering with root-of-trust code; 50 µA standby current extends uptime in fanless, thermally constrained enclosures. | Use Scenario: Storing calibration coefficients and safety-critical configuration parameters in portable ultrasound devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power nonvolatile memory retaining device-specific settings across power cycles and battery swaps. Use Value: 3.0V minimum operation aligns with battery discharge curve; hardware data protection prevents parameter corruption during transient voltage drops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV040-90VI | 2.7V–3.6V operation; wider voltage range than LV variant | Better suited for mixed-supply systems with marginal 3.3V rails | Select when board-level VCC may dip below 3.0V during transients |
| SST39VF400A-90-4C-EKE | 3.0V–3.6V; 70 ns read; 12V-only product ID entry; no boot block lockout | Lacks hardware-protected boot sector; requires external lock management | Choose only if boot block protection is unnecessary and SST's faster 70 ns access is prioritized |
Compared with AT49BV040-90VI and SST39VF400A-90-4C-EKE, the AT49LV040-90VI provides tighter voltage tolerance (3.0V min), integrated boot lockout, and lower standby current (50 µA vs. 100 µA), making it optimal for battery-sensitive and security-critical embedded designs.
Availability
AT49LV040-90VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS code retention, and embedded network router bootloader applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49LV040-90VI 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 AT49LV series was designed specifically for 3.3V embedded systems requiring EPROM-compatible Flash with hardware write protection and in-system reprogrammability - targeting legacy upgrade paths and cost-sensitive industrial controllers.
FAQ
What is the operating temperature range for the AT49LV040-90VI?
The AT49LV040-90VI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table on page 5 of the official Atmel datasheet (Rev. 0679D–03/01), where the "I" suffix in the ordering code explicitly denotes industrial grade. The device maintains full functionality-including 90 ns read access and 30 µs byte programming-across this entire range.
Does the AT49LV040-90VI support true 3.3V-only operation without external voltage translators?
Yes, the AT49LV040-90VI operates natively from 3.0V to 3.6V for both read and write functions, eliminating the need for external voltage translators. Its input thresholds (VIL = 0.8V, VIH = 2.0V) and I/O voltage tolerance (0V to VCC + 0.6V) ensure compatibility with standard 3.3V CMOS logic families. This is documented in the "DC Characteristics" table (page 5) and "Input Levels" section (page 4) of the datasheet.
How is the boot block protected on the AT49LV040-90VI, and can it be reversed?
The AT49LV040-90VI boot block (16 KB, addresses 00000H–03FFFH) is protected via a one-time hardware lockout activated by a six-byte software command sequence (5555h/AAh → 2AAAh/55h → 5555h/40h). Once enabled, the lockout is permanent: the boot block cannot be erased or programmed, and no command exists to disable it. This behavior is specified in the "BOOT BLOCK PROGRAMMING LOCKOUT" section (page 2) and verified in the "Boot Block Lockout Feature Enable Algorithm" (page 10).
What methods does the AT49LV040-90VI provide to detect completion of programming or erase cycles?
The AT49LV040-90VI offers two independent, hardware-supported methods: Data Polling (monitoring I/O7 for complement toggle during byte programming) and Toggle Bit (observing I/O6 state flip during program/erase). Both operate asynchronously and require no external clocks. These are defined in the "DATA POLLING" and "TOGGLE BIT" sections (pages 3–4), with timing parameters (tDH, tOEH) provided in Tables on pages 9–10.
Is the AT49LV040-90VI pin-compatible with standard 32-pin EPROMs like the 27C040?
No, the AT49LV040-90VI is not pin-compatible with the 32-pin 27C040 EPROM. While both use 32-pin packages (PLCC/TSOP), the AT49LV040-90VI replaces the 27C040's VPP programming voltage pin with a WE (Write Enable) signal and uses different pin assignments for CE/OE. Pin compatibility is only valid within the AT49BV/LV040 family (e.g., AT49LV040-90VI ↔ AT49BV040-90VI), as confirmed in the "Pin Configurations" diagrams (pages 1–2) and "Ordering Information" table (page 11).
AT49LV040-90VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K 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-VSOP
AT49LV040-90VI FAQ
1.How can I place an order for AT49LV040-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV040-90VI 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 AT49LV040-90VI reliable?
The price and inventory of AT49LV040-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV040-90VI is usually 5 days.
3.What payment methods are accepted for AT49LV040-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV040-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV040-90VI?
AT49LV040-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV040-90VI 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 AT49LV040-90VI?
For technical support, including AT49LV040-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV040-90VI requirements.
6.How does Aetrix verify that AT49LV040-90VI is sourced from the original manufacturer or authorized distributors?
All AT49LV040-90VI 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 AT49LV040-90VI meets industry standards.
7.What is the process for return or replacement of AT49LV040-90VI?
All AT49LV040-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV040-90VI, 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 AT49LV040-90VI part is unused and in its original packaging.
Return procedure for AT49LV040-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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