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Microchip Technology AT49LV001-90VI
- Part No.:
- AT49LV001-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49LV001-90VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
AT49LV001-90VI from Microchip Technology (formerly Atmel) is a 1 Mbit (128K × 8) single-supply 3.0–3.6 V 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-programmable architecture with sector protection, and operates across –40°C to +85°C industrial temperature range.
For engineers reviewing the AT49LV001-90VI datasheet, AT49LV001-90VI pinout, AT49LV001-90VI application, or AT49LV001-90VI equivalent, this page provides verified functional specifications, validated pin mapping for VSOP/TSOP/PLCC packages, boot-block lockout behavior, DATA polling and toggle-bit status detection methods, and real-world use cases in firmware update and secure boot subsystems.
Technical Context
The AT49LV001-90VI implements a standard parallel Flash interface with CE/OE/WE control logic and supports hardware reset-driven boot-block reprogramming override at 12 V. Its sector architecture includes one 16-Kbyte boot block (00000H–03FFFH), two 8-Kbyte parameter blocks, and two main memory blocks (32K/64K bytes).
It uses internal command register sequencing for erase and program operations - no external high-voltage programming supply required. Erase and program cycles are internally timed, and end-of-operation detection is supported via DATA polling (I/O7 complement) or toggle-bit (I/O6) monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8 bits); sufficient for small MCU boot firmware or configuration tables |
| Read Access Time | 90 ns max; compatible with 11 MHz bus timing in legacy 8-bit microcontrollers |
| Supply Voltage | 3.0 V to 3.6 V; single-supply operation eliminates need for 5 V or 12 V rails |
| Chip Erase Time | 10 seconds typical; enables field firmware updates without long downtime |
| Byte Programming Time | 30 µs typical; allows fine-grained patching of individual configuration bytes |
| End-of-Operation Detection | DATA polling (I/O7) and toggle-bit (I/O6); eliminates need for fixed delay timers in host firmware |
| Write Endurance | 10,000 program/erase cycles; suitable for infrequent field updates over product lifetime |
Pinout & Package
AT49LV001-90VI is available in 32-lead VSOP (8 × 14 mm) and TSOP (8 × 20 mm) packages - both surface-mount, industrial-grade variants rated for –40°C to +85°C. Pinout is identical across VSOP/TSOP/PLCC/DIP packages per datasheet Figure 2 and 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 enables access beyond 64K boundary |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for read/write; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output gate; controls data bus drive; used with CE for bus contention avoidance |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Hardware Reset Input | Active-low reset; halts ongoing operation and forces high-Z outputs; 12 V pulse overrides boot-block lockout |
| VCC | Power Supply | +3.0 V to +3.6 V supply; powers core logic and I/O buffers |
| GND | Ground Reference | Signal and power return; decoupling capacitor required near VCC pin |
| NC / DC | No Connect / Don't Connect | Unbonded pins (e.g., pin 9 in TSOP, pin 1 in DIP/PLCC); must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16-Kbyte protected region (00000H–03FFFH) prevents accidental overwrite of boot code; enabled via 6-byte command sequence |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filter (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) |
| Sector-Erasable Architecture | Independent erasure of two 8-Kbyte parameter blocks and two main memory blocks (32K/64K); avoids full-chip erase for partial updates |
| 12 V RESET Override | Applying 12 V ± 0.5 V to RESET pin during erase/program temporarily disables boot-block lockout - critical for recovery firmware updates |
| Low Power Standby | 50 µA CMOS standby current; enables battery-backed retention in always-on embedded systems |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing firmware images and calibration constants in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct CPU bus interface for XIP (execute-in-place) boot code and runtime parameter storage. Use Value: Boot-block lockout ensures bootloader integrity while allowing safe parameter block updates without risk of bricking the device. | Use Scenario: Retaining device-specific calibration data, user preferences, and safety-critical configuration settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power, industrial-temperature-rated Flash memory supporting infrequent but reliable write cycles under battery backup. Use Value: 50 µA standby current extends battery life; 10,000-cycle endurance exceeds regulatory requirements for medical recalibration intervals. |
| Automotive ECU Bootloader Storage | Legacy Industrial HMI Display Firmware |
Use Scenario: Hosting secure boot firmware in engine control units where tamper resistance and field update resilience are mandatory. IC Role / Device Role / Timing Role: Protected Flash memory with hardware reset override enabling recovery from corrupted firmware via 12 V service mode. Use Value: RESET-driven 12 V override allows service technicians to reflash locked boot sectors - eliminating need for chip replacement. | Use Scenario: Storing display firmware and font assets in human-machine interface panels using 8-bit microcontrollers with parallel address/data buses. IC Role / Device Role / Timing Role: 90 ns read access Flash memory directly interfaced to 8051 or Z80 derivatives without wait states. Use Value: Pin-compatible replacement for obsolete EPROMs; eliminates UV-erasure and socket wear while retaining same PCB footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV001-90VI | Wider VCC range (2.7–3.6 V); higher active current (50 mA); faster 70 ns variant available | Supports battery-powered systems down to 2.7 V; better suited for mixed-voltage designs | Select when system VCC may dip below 3.0 V or when faster read access is needed |
| SST39VF010-90-4C-NHE | Same 1 Mbit density, 90 ns access, 3.0–3.6 V; supports CFI query; no RESET override | Lacks 12 V boot-block override; uses different command set; no hardware reset recovery path | Choose for CFI-compliant systems requiring standardized flash interrogation; avoid if boot-sector recovery is required |
Compared with AT49BV001-90VI and SST39VF010-90-4C-NHE, the AT49LV001-90VI offers stricter 3.0–3.6 V operation ideal for stable regulated supplies, retains unique 12 V RESET override for boot-block recovery, and maintains full command compatibility within the AT49x family - making it optimal for legacy Atmel-based designs requiring guaranteed firmware resilience.
Availability
AT49LV001-90VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive ECU bootloader applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AT49LV001-90VI 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
Microchip Technology acquired Atmel in 2016 and continues to manufacture, support, and qualify legacy Atmel Flash products including the AT49LV series for industrial and automotive applications.
The AT49LV001-90VI belongs to Atmel's Battery-Voltage™ Flash memory product line, designed specifically for 3 V-only embedded systems requiring reliable in-system reprogrammability without high-voltage programming circuitry.
FAQ
What is the correct VCC operating range for AT49LV001-90VI?
The AT49LV001-90VI requires a regulated 3.0 V to 3.6 V supply. Unlike the AT49BV001 variant, it does not support 2.7 V operation. Operation outside this range may cause read errors, failed programming, or permanent damage. The device includes VCC sense circuitry that inhibits programming if voltage drops below ~1.8 V.
Does AT49LV001-90VI support boot block protection, and how is it enabled?
Yes, AT49LV001-90VI supports boot block programming lockout for its 16-Kbyte region (00000H–03FFFH). It is enabled via a six-cycle command sequence: load AAh at 5555H, 55h at 2AAAH, 80h at 5555H, then AAh/55h/40h at 5555H/2AAAH/5555H. Once activated, the boot block cannot be erased or programmed at ≤5.5 V.
Can AT49LV001-90VI be reprogrammed in-system without removing it from the PCB?
Yes, AT49LV001-90VI is designed for full in-system reprogrammability. It uses only 3 V-level commands - no external 12 V programming voltage is needed for standard operations. The 12 V RESET override is optional and used solely for recovering a locked boot block during service, not routine programming.
What package types are offered for AT49LV001-90VI, and which is most common?
AT49LV001-90VI is offered in 32-lead VSOP (8 × 14 mm) and TSOP (8 × 20 mm) packages, both industrial-grade (–40°C to +85°C). The VSOP variant (suffix 'V') is most commonly stocked for space-constrained industrial controls, while TSOP (suffix 'T') is preferred for higher thermal dissipation in extended-duty applications.
How does DATA polling work on AT49LV001-90VI, and what pin indicates completion?
During byte programming, reading the last written address returns the complement of the loaded data on I/O7 until programming completes. When valid data appears on I/O7 (i.e., matches the written value), the cycle is finished. This allows host firmware to poll asynchronously without fixed delays - a key feature for deterministic real-time update routines in AT49LV001-90VI implementations.
AT49LV001-90VI 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:
- 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-VSOP
AT49LV001-90VI FAQ
1.How can I place an order for AT49LV001-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV001-90VI 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 AT49LV001-90VI reliable?
The price and inventory of AT49LV001-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV001-90VI is usually 5 days.
3.What payment methods are accepted for AT49LV001-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV001-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV001-90VI?
AT49LV001-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV001-90VI 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 AT49LV001-90VI?
For technical support, including AT49LV001-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV001-90VI requirements.
6.How does Aetrix verify that AT49LV001-90VI is sourced from the original manufacturer or authorized distributors?
All AT49LV001-90VI 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 AT49LV001-90VI meets industry standards.
7.What is the process for return or replacement of AT49LV001-90VI?
All AT49LV001-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV001-90VI, 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 AT49LV001-90VI part is unused and in its original packaging.
Return procedure for AT49LV001-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV001-90VI Tags
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