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Microchip Technology AT49LV1024-90VI
- Part No.:
- AT49LV1024-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49LV1024-90VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,926
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Product details
Overview
AT49LV1024-90VI from Atmel is a 1-megabit (64K × 16) 3.0V-only Flash memory IC used for nonvolatile program/data storage in embedded boot code and firmware applications. It features 90 ns read access time, industrial temperature range (–40°C to +85°C), 10,000 write/erase cycles, and an 8K-word boot block with hardware lockout. The device operates in standard EPROM-compatible read mode and supports word-by-word programming with Data Polling and Toggle Bit status detection.
For engineers reviewing the AT49LV1024-90VI datasheet, AT49LV1024-90VI pinout, AT49LV1024-90VI application, or AT49LV1024-90VI equivalent, key selection criteria include industrial-grade reliability, VSOP-40 package compatibility, boot-sector write protection, single-supply 3V operation, and fast 20 µs/word programming - all critical for secure firmware update architectures in industrial controllers and legacy system upgrades.
Technical Context
The AT49LV1024-90VI implements a 16-bit parallel interface with asynchronous read/write control via CE, OE, and WE signals, supporting EPROM-like read timing and command-set-based programming/erasing. Its internal architecture separates main memory (56K words) from an optional 8K-word boot block, each independently erasable using six-cycle command sequences.
Hardware data protection includes VCC sense (<1.8V inhibits programming), noise filtering (<15 ns pulses ignored on WE/CE), and active-level inhibit logic (OE low, CE high, or WE high blocks writes). Status detection relies on I/O7 Data Polling and I/O6 Toggle Bit, both usable at any point during erase or program cycles without halting host operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (64K × 16 bits) - provides sufficient space for boot firmware and configuration data in resource-constrained systems |
| Read Access Time | 90 ns - enables direct execution from flash (XIP) in microcontroller-based designs with ≤11 MHz bus timing |
| Supply Voltage | 3.0V to 3.6V - eliminates need for dual-voltage rails; compatible with 3.3V logic families and low-power industrial power supplies |
| Write Cycle Endurance | 10,000 program/erase cycles - supports field firmware updates over multi-year product lifecycles in industrial equipment |
| Boot Block Size | 8K words (0000H–1FFFH) - isolates critical startup code from accidental overwrite during main memory reprogramming |
| Programming Time | 20 µs per word (typical) - allows rapid incremental updates without long blocking delays in host-controlled flash management |
| Operating Temperature | –40°C to +85°C - certified for use in industrial automation, motor drives, and outdoor embedded systems |
Pinout & Package
AT49LV1024-90VI uses a 40-lead Thin Small Outline Package (VSOP), measuring 10 mm × 14 mm, with gull-wing leads and pin 1 marked by a beveled corner. This compact surface-mount package supports high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus for accessing full 64K-word memory space; A0–A15 fully decoded for linear addressing |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel data path; tristated when CE or OE is inactive to prevent bus contention |
| CE | Chip Enable | Active-low chip select; must be low for read/write operations; high-Z output state when asserted high |
| OE | Output Enable | Active-low output gate; controls data bus drivers independently of CE to support multiplexed bus sharing |
| WE | Write Enable | Active-low write strobe; latches address and data on falling edge for programming/erase commands |
| VCC | Power Supply | +3.0V to +3.6V supply; powers core logic and I/O buffers; decoupling required within 10 mm of pin |
| GND | Ground | Two dedicated ground pins (pins 18 and 30); mandatory for stable noise margin and signal integrity |
| NC | No Connect | Pins 7, 19, 27, 31, 32, 39 - internally unconnected; must remain floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Single-Voltage Programming | 3.1V only required for writes - eliminates need for external 12V programming voltage generators or charge pumps |
| Boot Block Lockout | Hardware-enforced write protection for 0000H–1FFFH region - prevents corruption of bootloader during field firmware updates |
| Data Polling & Toggle Bit | Real-time status feedback via I/O7 and I/O6 - enables interrupt-driven programming without polling overhead or fixed timeout delays |
| Fast Erase Cycles | Chip erase in ≤5 seconds, main memory erase in ≤5 seconds - reduces downtime during firmware recovery procedures |
| Hardware Write Inhibit | VCC sense, noise filtering, and level-sensitive gating - prevents spurious writes during power-up/down or EMI events |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Code |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing XIP-capable instruction storage and parameter retention across power cycles. Use Value: Industrial temperature rating (–40°C to +85°C) and 10,000-cycle endurance ensure reliable operation over 10+ years of scheduled firmware updates. |
Use Scenario: Replacing obsolete EPROMs in legacy medical devices and test equipment where board space and voltage compatibility are constrained. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical 16-bit parallel interface and 90 ns read timing. Use Value: Single 3.3V supply eliminates need for +5V/–5V rails, reducing BOM cost and simplifying power design while maintaining pin-compatible footprint. |
| Secure Bootloader Isolation | Field-Upgradeable Communication Module |
Use Scenario: Isolating immutable bootloader code from updatable application firmware in network-connected industrial gateways. IC Role / Device Role / Timing Role: Dual-region Flash memory enabling independent erase/program control of boot sector (0000H–1FFFH) and main memory. Use Value: Hardware lockout prevents accidental or malicious overwrite of boot code - critical for achieving IEC 62443-3-3 secure boot requirements. |
Use Scenario: Enabling remote firmware updates in cellular IoT modules where field reprogramming must avoid bricking the device. IC Role / Device Role / Timing Role: In-system programmable Flash supporting word-by-word updates without full chip erase. Use Value: 20 µs/word programming and Data Polling allow host MCU to verify each write before proceeding - minimizing risk of partial update failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF100A-90-4C-NHE | Same density (1 Mbit ×16), 90 ns access, but uses 3.3V ±10% supply and lacks boot block lockout | Requires external software protection for boot code; no hardware-enforced write lock | Choose when boot security is managed in firmware and lower cost is prioritized over hardware lockout |
| MX29LV160CBTI-90G | 16 Mbit capacity, 90 ns access, 3.0V–3.6V supply, boot block (8K/16K configurable), but requires different command set | Higher density supports larger firmware images; command set incompatible with AT49LV1024-90VI | Choose when future-proofing for larger code size is needed and firmware driver can be updated for new command protocol |
Compared with SST39VF100A-90-4C-NHE and MX29LV160CBTI-90G, the AT49LV1024-90VI uniquely delivers industrial-grade reliability, hardware boot lockout, and exact EPROM-read compatibility in a compact VSOP-40 package - making it optimal for legacy system refreshes where security, timing fidelity, and footprint constraints are non-negotiable.
Availability
AT49LV1024-90VI is available at Aetrix Electronics and suitable for industrial automation, legacy system upgrades, and secure bootloader implementations requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AT49LV1024-90VI 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 AT49LV1024 product line was designed specifically for in-system reprogrammable boot memory in 3.3V embedded systems - emphasizing hardware data protection, industrial temperature resilience, and EPROM drop-in compatibility.
FAQ
What is the operating temperature range of the AT49LV1024-90VI?
The AT49LV1024-90VI is rated for industrial operation from –40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official datasheet (Rev. 1278D–07/01), where the "I" suffix denotes industrial grade. The device maintains full 90 ns read access time and reliable programming performance across this full range.
Does the AT49LV1024-90VI require high-voltage programming signals?
No, the AT49LV1024-90VI does not require high-voltage programming signals. As stated in the Features section, it supports single-voltage operation: 3V for read and 3.1V for programming. All programming and erase commands are executed using standard 3.3V logic levels applied to CE, OE, WE, and I/O pins - no external 12V generator or charge pump is needed.
How is the boot block protected from accidental erasure in the AT49LV1024-90VI?
The AT49LV1024-90VI implements hardware-enforced boot block lockout for the 8K-word region (0000H–1FFFH). Once enabled via a six-cycle command sequence (5555H/AA → 2AAAH/55 → 5555H/80 → 5555H/AA → 2AAAH/55 → 5555H/40), the boot block becomes permanently immune to both erase and program commands - even during chip erase operations.
What package type is used by the AT49LV1024-90VI?
The AT49LV1024-90VI uses a 40-lead Thin Small Outline Package (VSOP), measuring 10 mm × 14 mm. This is explicitly defined in the "AT49LV1024 Ordering Information" table (page 13) and illustrated in the "AT49LV1024 VSOP Top View" diagram (page 2). The "VC" suffix in other variants confirms VSOP; the "VI" suffix denotes industrial temperature grade within that same package.
Can the AT49LV1024-90VI be used as a direct replacement for standard EPROMs?
Yes, the AT49LV1024-90VI supports EPROM-compatible read operation: when CE and OE are low and WE is high, it asserts data on I/O0–I/O15 identically to a 27C1001 or similar 16-bit EPROM. Its 90 ns access time, parallel address/data bus, and identical pinout (VSOP-40) enable drop-in replacement - though programming requires command sequences instead of UV erasure.
AT49LV1024-90VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-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:
- 1Mbit
- Memory Organization:
- 64K x 16
- 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:
- 40-VSOP
AT49LV1024-90VI FAQ
1.How can I place an order for AT49LV1024-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV1024-90VI 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 AT49LV1024-90VI reliable?
The price and inventory of AT49LV1024-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV1024-90VI is usually 5 days.
3.What payment methods are accepted for AT49LV1024-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV1024-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV1024-90VI?
AT49LV1024-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV1024-90VI 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 AT49LV1024-90VI?
For technical support, including AT49LV1024-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV1024-90VI requirements.
6.How does Aetrix verify that AT49LV1024-90VI is sourced from the original manufacturer or authorized distributors?
All AT49LV1024-90VI 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 AT49LV1024-90VI meets industry standards.
7.What is the process for return or replacement of AT49LV1024-90VI?
All AT49LV1024-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV1024-90VI, 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 AT49LV1024-90VI part is unused and in its original packaging.
Return procedure for AT49LV1024-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV1024-90VI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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