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Microchip Technology AT49LV040-90TC
- Part No.:
- AT49LV040-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LV040-90TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,742
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Product details
Overview
AT49LV040-90TC 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 reprogrammability without high-voltage inputs.
For engineers reviewing the AT49LV040-90TC datasheet, AT49LV040-90TC pinout, AT49LV040-90TC application, or AT49LV040-90TC equivalent, key selection criteria include boot-sector protection, 3.0V-only operation, TSOP-32 package compatibility, and Data Polling/Toggle Bit end-of-write detection for embedded firmware storage.
Technical Context
The AT49LV040-90TC implements a CMOS-based NOR Flash architecture with dual-line control (CE/OE) for bus contention avoidance and internal command register-based byte programming. Its software-controlled chip erase uses six-byte sequences to address locations 5555H/2AAAH/5555H with data patterns AAH/55H/80H/AAH/55H/10H.
Boot block lockout is activated via a dedicated six-command sequence targeting addresses 5555H/2AAAH/5555H/5555H/2AAAH/5555H with data AAH/55H/80H/AAH/55H/40H, permanently protecting the 00000H–03FFFH region from further writes or erases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), enabling full BIOS/firmware storage in compact embedded systems |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz system bus interfaces |
| Supply Voltage | 3.0V–3.6V - compatible with standard 3.3V logic rails without level-shifting |
| Chip Erase Time | 10 seconds typical - enables rapid field firmware updates during maintenance windows |
| Byte Programming Time | 30 µs typical - supports efficient patch-level code updates without long write stalls |
| Standby Current | 50 µA CMOS - critical for battery-backed applications requiring ultra-low quiescent power |
| End-of-Write Detection | Data Polling on I/O7 and Toggle Bit on I/O6 - eliminates need for fixed delay timers in host firmware |
| Boot Block Size | 16 KB (00000H–03FFFH) - sufficient for secure bootloader code with permanent write-lock capability |
Pinout & Package
AT49LV040-90TC is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP) measuring 8 mm × 14 mm (JEDEC MO-142 BA, type 32V), optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0 least significant bit |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; supports byte-wide reads/writes and status polling on I/O6/I/O7 |
| CE | Chip Enable | Active-low chip select; must be low for any memory access; enables hardware write inhibition when high |
| OE | Output Enable | Active-low output control; used with CE to gate read data and implement Data Polling |
| WE | Write Enable | Active-low write strobe; latches address/data during programming; inhibits writes when high |
| VCC | Power Supply | 3.0V–3.6V supply; includes VCC sense circuitry that disables programming if voltage drops below 1.8V |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.0V–3.6V Supply | Eliminates need for separate 5V or 12V programming voltages, simplifying power design and reducing BOM count |
| Hardware Boot Block Lockout | Permanently protects 16 KB bootloader region (00000H–03FFFH) after activation, preventing accidental corruption during field updates |
| Data Polling & Toggle Bit | Enables real-time, cycle-accurate detection of program/erase completion without fixed delays or external timers |
| 10,000 Write/Erase Cycles | Supports long-term field deployment in industrial controllers and medical devices requiring frequent firmware revisions |
| Noise-Filtered WE/CE Inputs | Rejects sub-15 ns glitches, preventing spurious writes during EMI-prone environments like motor drives or power supplies |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed 10,000-cycle endurance and -40°C to +85°C industrial temperature rating. Use Value: Enables reliable in-field firmware updates without hardware rework, leveraging 30 µs/byte programming and Data Polling for deterministic timing control. | Use Scenario: Hosting secure bootloader code in FDA-cleared diagnostic equipment where unauthorized modification must be physically prevented. IC Role / Device Role / Timing Role: Boot block-protected Flash memory providing tamper-resistant startup code execution. Use Value: Hardware-enforced 16 KB write lockout ensures bootloader integrity across device lifecycle, meeting IEC 62304 safety requirements. |
| Automotive Infotainment System BIOS | Network Router Configuration Storage |
Use Scenario: Storing BIOS and calibration tables in automotive head units subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: 3.0V–3.6V operation compatible with vehicle 3.3V power domains and 90 ns read access for fast boot sequences. Use Value: Low 50 µA standby current extends battery life during ignition-off periods while maintaining fast wake-up readiness. | Use Scenario: Retaining configuration parameters and firmware images in enterprise-grade routers requiring zero-downtime updates. IC Role / Device Role / Timing Role: Dual-mode update support: full-chip erase (10 s) for major releases and byte-programming (30 µs) for hot patches. Use Value: Toggle Bit detection allows concurrent background updates without CPU polling overhead, improving system throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-90-4C-NHE | 4 Mbit, 3.0V–3.6V, 90 ns access, but uses different command set and lacks boot block lockout | Requires modified firmware driver; no hardware-protected bootloader region | Select only if existing SST39VF400A driver infrastructure exists and boot security is not required |
| MX29LV400CBTI-90G | 4 Mbit, 3.0V–3.6V, 90 ns access, top-boot configuration (boot block at highest addresses) | Boot block resides at 7C000H–7FFFFH instead of 00000H–03FFFH; incompatible address mapping | Choose only when board layout reserves upper memory space for boot code and top-boot architecture is acceptable |
Compared with SST39VF400A-90-4C-NHE and MX29LV400CBTI-90G, the AT49LV040-90TC uniquely provides bottom-boot architecture with hardware-enforced lockout at 00000H–03FFFH and Atmel's proven command-set compatibility for legacy embedded systems.
Availability
AT49LV040-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive infotainment BIOS requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49LV040-90TC 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 embedded systems.
The AT49LV040-90TC belongs to Atmel's Battery-Voltage™ Flash memory product line, designed specifically for 3.0V–3.6V embedded applications requiring robust in-system reprogrammability and hardware data protection.
FAQ
What is the operating voltage range for the AT49LV040-90TC?
The AT49LV040-90TC operates within a strict 3.0V to 3.6V supply range. This single-voltage specification eliminates the need for auxiliary high-voltage programming supplies. The device incorporates VCC sense circuitry that automatically inhibits programming if the supply drops below approximately 1.8V, ensuring data integrity during brown-out conditions. All input levels (address, CE, OE, WE) tolerate 0V to 5.5V, but I/O lines are limited to 0V to VCC + 0.6V.
How does the boot block lockout feature work on the AT49LV040-90TC?
The AT49LV040-90TC includes a 16 KB boot block (00000H–03FFFH) with optional hardware lockout. Once enabled via a specific six-command sequence (5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/40H), the region becomes permanently read-only: no further erases or writes are possible. Lockout status can be verified by reading I/O0 at address 00002H in Product Identification mode - a high level indicates activation. The AT49LV040-90TC retains full programmability of the remaining 496 KB main memory.
What are the supported methods for detecting end-of-program on the AT49LV040-90TC?
The AT49LV040-90TC supports two independent, hardware-verified methods for detecting program completion: Data Polling and Toggle Bit. During programming, reading the last written byte returns its complement on I/O7 until completion, then true data. Simultaneously, I/O6 toggles between 0 and 1 during active programming and stabilizes upon completion. Both methods allow the host processor to avoid fixed delays and initiate the next operation immediately, significantly improving firmware update efficiency in the AT49LV040-90TC.
Is the AT49LV040-90TC pin-compatible with other 4 Mbit Flash devices?
The AT49LV040-90TC uses a standard 32-pin TSOP (8 × 14 mm) footprint with JEDEC MO-142 BA outline (package code 32V), matching pin assignments for address (A0–A18), data (I/O0–I/O7), and controls (CE/OE/WE/VCC/GND). However, command sets and timing parameters differ across vendors - for example, SST39VF400A and MX29LV400CBTI use distinct unlock sequences and lack identical boot block behavior. Direct substitution requires firmware validation; the AT49LV040-90TC is not a drop-in replacement without driver adaptation.
What is the maximum number of program/erase cycles guaranteed for the AT49LV040-90TC?
The AT49LV040-90TC is rated for a minimum of 10,000 program/erase cycles per memory location, as specified in the official Atmel datasheet. This endurance rating applies to both the main memory array and the boot block prior to lockout activation. The device employs advanced nonvolatile CMOS technology to ensure consistent performance across its commercial (0°C to 70°C) and industrial (-40°C to +85°C) temperature grades. Real-world reliability exceeds this spec under typical usage, making the AT49LV040-90TC suitable for applications requiring frequent field updates over multi-year deployments.
AT49LV040-90TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49LV040-90TC FAQ
1.How can I place an order for AT49LV040-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV040-90TC 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 AT49LV040-90TC reliable?
The price and inventory of AT49LV040-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV040-90TC is usually 5 days.
3.What payment methods are accepted for AT49LV040-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV040-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV040-90TC?
AT49LV040-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV040-90TC 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 AT49LV040-90TC?
For technical support, including AT49LV040-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV040-90TC requirements.
6.How does Aetrix verify that AT49LV040-90TC is sourced from the original manufacturer or authorized distributors?
All AT49LV040-90TC 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 AT49LV040-90TC meets industry standards.
7.What is the process for return or replacement of AT49LV040-90TC?
All AT49LV040-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV040-90TC, 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 AT49LV040-90TC part is unused and in its original packaging.
Return procedure for AT49LV040-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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