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Microchip Technology AT49LV321T-90TI
- Part No.:
- AT49LV321T-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LV321T-90TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
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Product details
Overview
AT49LV321T-90TI from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC with sector-erase architecture, 90 ns access time, and dual-mode byte/word operation enabled by the BYTE pin. It supports in-system programming in embedded controllers, BIOS storage, and firmware update modules where low-voltage operation (2.65–3.3 V) and sector-level write protection are required.
For engineers reviewing the AT49LV321T-90TI datasheet, AT49LV321T-90TI pinout, AT49LV321T-90TI application, or AT49LV321T-90TI equivalent, key selection considerations include its 71-sector erase topology (63 × 64 KB + 8 × 8 KB), suspend/resume capability for concurrent read/program during erase, RDY/BUSY open-drain output, 128-bit protection register, and TSOP-48 package with A-1 address aliasing on I/O15 in byte mode.
Technical Context
The AT49LV321T-90TI implements a command-register-based Flash architecture with hardware data protection (VCC sense, noise filtering, VPP voltage gating), programmable configuration register (00/01 modes), and status monitoring via I/O2–I/O7 and dedicated RDY/BUSY. Its sector lockdown feature enables secure boot code retention while allowing field-updatable application sectors.
It supports both x8 and x16 data bus widths via the BYTE pin: logic high enables full 16-bit I/O0–I/O15 operation; logic low configures I/O0–I/O7 as active data lines and repurposes I/O15 as A-1 LSB address input. The device powers up in read mode and requires six-byte command sequences for chip/sector erase and lockdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8) - supports dual-width microprocessor interfaces without external data multiplexing |
| Access Time | 90 ns - guarantees timing compliance with 11 MHz bus clocks in read mode |
| Supply Voltage | 2.65 V to 3.3 V - enables direct interface with 3.3 V logic systems without level shifters |
| Program Time | 15 µs per word - reduces firmware update latency in field-programmable applications |
| Sector Erase Time | 200 ms per sector - allows selective reprogramming of application partitions without full chip erase |
| Standby Current | 10 µA - minimizes power draw in battery-backed or always-on embedded systems |
| Package | 48-pin TSOP Type I - industry-standard footprint compatible with automated PCB assembly |
Pinout & Package
AT49LV321T-90TI is packaged in a 48-lead TSOP Type I (Thin Small Outline Package) with 0.5 mm pitch, 12.0 × 20.0 mm body size, and standard JEDEC MO-141AC footprint. Pin 1 is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 4 MB (x8) or 2 MB (x16) addressing; A-1 alias on I/O15 in byte mode |
| I/O0–I/O15 | Data I/O (x16) / I/O0–I/O7 + A-1 (x8) | Configurable bidirectional data bus; BYTE pin selects mode - critical for matching host bus width |
| CE, OE, WE | Chip Enable, Output Enable, Write Enable | Three-control read/write protocol prevents bus contention; OE/CE dual-enable required for valid output |
| BYTE | Bus Width Select | Logic high = x16 mode (I/O0–I/O15 active); logic low = x8 mode (I/O0–I/O7 active, I/O15 = A-1) |
| RDY/BUSY | Open-Drain Status Output | Active-low indicates internal program/erase activity; supports wired-OR of multiple devices on shared status line |
| VPP | Write Protection Voltage Input | Must be ≥1.65 V for erase/program; <0.8 V disables all write operations - hardware lockout independent of software |
| RESET | Hardware Initialization | Pulling low halts ongoing operations and forces high-impedance outputs; required to exit suspend or error states |
Key Features
| Feature | Design Value |
|---|---|
| Erase Suspend/Resume | Allows reading or programming any non-erasing sector while another sector erases - enables real-time firmware updates without system stall |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-programmable/lockable block B - provides tamper-resistant storage for keys or calibration data |
| Sector Lockdown | Per-sector write-protection activated via 6-cycle command - preserves boot code integrity during field upgrades of application sectors |
| Data Polling & Toggle Bit | Dual-status detection (I/O7 complement or I/O6 toggle) - eliminates need for polling delays or external timers in host firmware |
| Single-Pulse Program Mode | After 6-byte entry sequence, writes require only one WE pulse - cuts host-side command overhead by >70% vs. standard 4-cycle programming |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
|
Use Scenario: Storing and updating firmware images in programmable logic controllers operating in harsh environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level erase isolation - protects bootloader while enabling application partition updates. Use Value: 90 ns access time ensures deterministic instruction fetch latency; 10 µA standby current extends uptime in battery-buffered control units. |
Use Scenario: Securing boot ROM and runtime configuration in enterprise-grade network routers requiring FIPS-compliant firmware integrity. IC Role / Device Role / Timing Role: Dual-mode x8/x16 interface matches MIPS or ARM bus widths; sector lockdown isolates secure boot loader from user-modifiable config sectors. Use Value: 128-bit protection register stores cryptographic keys; RDY/BUSY pin enables interrupt-driven flash management without CPU polling. |
| Medical Device Diagnostic Software | Automotive Infotainment System Updates |
|
Use Scenario: Field-upgradable diagnostic algorithms and calibration tables in FDA-cleared portable medical instruments. IC Role / Device Role / Timing Role: In-system programmable Flash with hardware VPP lockout - prevents accidental overwrite during power transients or ESD events. Use Value: 200 ms sector erase time enables rapid patch deployment; suspend/resume allows background diagnostics to continue during firmware load. |
Use Scenario: Over-the-air (OTA) map and UI asset updates in automotive head units with strict ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: Sector-locked boot partition ensures fail-safe recovery; 2.65–3.3 V operation aligns with vehicle's 3.3 V power domain. Use Value: 15 µs word program time accelerates delta updates; TSOP-48 package meets automotive thermal cycling and vibration standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV321T-90TI | 3.0 V core supply (2.65–3.3 V), no VCCQ separation - simpler power design but less I/O voltage flexibility | Optimized for cost-sensitive industrial and consumer systems with fixed 3.3 V rails | Select when board uses single 3.3 V supply and does not require mixed-voltage I/O buffering |
| SST39VF3201-90-4C-EKE | 3.3 V-only operation (3.0–3.6 V), 90 ns access, 48-TSOP, but lacks RDY/BUSY pin and suspend/resume | Suitable for static firmware storage where concurrent read/program is unnecessary | Choose for legacy designs needing drop-in replacement without modifying status-handling firmware |
Compared with AT49BV321T-90TI and SST39VF3201-90-4C-EKE, the AT49LV321T-90TI uniquely combines low-voltage operation, hardware suspend/resume, and RDY/BUSY signaling - making it optimal for real-time embedded systems requiring field-upgradable code with guaranteed responsiveness.
Availability
AT49LV321T-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, medical device diagnostic software, and automotive infotainment system updates requiring stable component supply across extended product lifecycles.
Supply support for AT49LV321T-90TI 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 full technical and manufacturing continuity for the AT49LV series. The company specializes in secure, reliable microcontrollers and nonvolatile memory for industrial and automotive applications.
The AT49LV321T-90TI belongs to Microchip's legacy parallel Flash memory product line, designed specifically for embedded systems requiring in-system programmability, sector-level security, and robust operation across industrial temperature ranges (–40°C to +85°C).
FAQ
What is the difference between AT49LV321T-90TI and AT49BV321T-90TI?
The AT49LV321T-90TI operates from a single 2.65–3.3 V supply, while the AT49BV321T-90TI requires 2.7–3.6 V. Both share identical pinout, sector architecture, and command set, but the LV variant offers tighter voltage tolerance for low-power systems. AT49LV321T-90TI is backward-compatible in most 3.3 V designs but must be verified for VPP threshold stability below 2.7 V.
Does AT49LV321T-90TI support both x8 and x16 data bus widths?
Yes, AT49LV321T-90TI supports both configurations via the BYTE pin: logic high enables x16 mode (I/O0–I/O15 active), logic low enables x8 mode (I/O0–I/O7 active, I/O15 functions as A-1 address input). This eliminates need for external data multiplexers and simplifies interface to 8-bit or 16-bit microcontrollers.
How does the RDY/BUSY pin function on AT49LV321T-90TI?
The RDY/BUSY pin on AT49LV321T-90TI is an open-drain output that pulls low during internal program or erase cycles and releases high at completion. It supports wired-OR connection with other devices on a shared status line. Unlike polling I/O pins, RDY/BUSY provides hardware-synchronized readiness detection without CPU intervention.
Can sector lockdown on AT49LV321T-90TI be reversed without power cycling?
No - once a sector is locked down using the 6-cycle Sector Lockdown command, it remains read-only until the device undergoes a hardware reset or power cycle. AT49LV321T-90TI does not support software-unlock commands; this design ensures irreversible protection of critical boot code against malware or firmware corruption.
What is the purpose of the VPP pin on AT49LV321T-90TI?
The VPP pin on AT49LV321T-90TI serves as a hardware write-protection gate: erase and program operations are disabled when VPP < 0.8 V, and enabled only when VPP ≥ 1.65 V. It must be tied to VCC (or a regulated 3.3 V source) during programming; leaving it floating violates Absolute Maximum Ratings and may cause erratic behavior.
AT49LV321T-90TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-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:
- 32Mbit
- Memory Organization:
- 4M x 8, 2M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 150µs
- 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:
- 48-TSOP
AT49LV321T-90TI FAQ
1.How can I place an order for AT49LV321T-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV321T-90TI 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 AT49LV321T-90TI reliable?
The price and inventory of AT49LV321T-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV321T-90TI is usually 5 days.
3.What payment methods are accepted for AT49LV321T-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV321T-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV321T-90TI?
AT49LV321T-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV321T-90TI 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 AT49LV321T-90TI?
For technical support, including AT49LV321T-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV321T-90TI requirements.
6.How does Aetrix verify that AT49LV321T-90TI is sourced from the original manufacturer or authorized distributors?
All AT49LV321T-90TI 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 AT49LV321T-90TI meets industry standards.
7.What is the process for return or replacement of AT49LV321T-90TI?
All AT49LV321T-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV321T-90TI, 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 AT49LV321T-90TI part is unused and in its original packaging.
Return procedure for AT49LV321T-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV321T-90TI Tags
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