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Microchip Technology AT49LV321-90TI
- Part No.:
- AT49LV321-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LV321-90TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LV321-90TI from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply 3.0V Flash memory IC with sector erase architecture, 90 ns access time, and byte/word programmability. It supports in-system reprogramming via CE/OE/WE control, features RDY/BUSY pin for operation status indication, and is used in embedded boot code storage, firmware update modules, and industrial controller nonvolatile configuration memory.
For engineers reviewing the AT49LV321-90TI datasheet, AT49LV321-90TI pinout, AT49LV321-90TI application, or AT49LV321-90TI equivalent, key selection considerations include its dual-mode (byte/word) operation via BYTE pin, 71-sector erase flexibility, suspend/resume capability for concurrent read/program, VPP-based hardware write protection, and TSOP-48 package compatibility with legacy 3.3V system designs.
Technical Context
The AT49LV321-90TI implements a command-register-based Flash architecture with internal state machine control for program, erase, suspend, and protection functions. It uses address latching on falling CE/WE edges and data latching on rising CE/WE edges, supporting standard microprocessor timing without external clocks.
Its dual-mode interface is controlled by the BYTE pin: logic high enables x16 word mode (I/O0–I/O15 active), logic low enables x8 byte mode (I/O0–I/O7 active, I/O15 repurposed as A−1 LSB address input). Sector lockdown, 128-bit protection register, and configurable status bit behavior (via configuration register) provide secure, field-upgradable firmware storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8), enabling full boot image + parameter storage in one device |
| Access Time | 90 ns max - meets real-time read latency requirements for MCU boot fetch and configuration lookup |
| Supply Voltage | 2.65V to 3.3V - compatible with regulated 3.0V system rails; no separate VPP generator required |
| Sector Architecture | 71 sectors: sixty-three 64KB (32K-word) + eight 8KB (4K-word) - allows granular firmware partitioning and safe OTA updates |
| Program Time | 15 µs per word - enables fast field programming without excessive timeout handling |
| Erase Time | 200 ms per sector - balances speed and reliability for partial firmware rewrites |
| Standby Current | 10 µA - supports low-power retention in battery-backed or energy-sensitive applications |
Pinout & Package
AT49LV321-90TI is packaged in a 48-pin Thin Small Outline Package (TSOP Type 1, 12 × 20 mm), pin-compatible with industry-standard 32-Mbit Flash footprints. Pin functions are validated per Atmel doc 1494H–FLASH–01/03.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 4M×8 or 2M×16 addressing; A−1 function on I/O15 in byte mode |
| I/O0–I/O15 | Data I/O (x16) / I/O0–I/O7 + A−1 (x8) | Configurable data width: BYTE pin selects between 16-bit parallel transfer or 8-bit with LSB address multiplexing |
| CE, OE, WE | Chip/Output/Write Enable | Dual-line (CE+OE) read control prevents bus contention; WE active-low initiates program/erase commands |
| RDY/BUSY | Open-drain Status Output | Active-low during internal operations; supports wired-OR of multiple devices on shared status line |
| VPP | Write Protection Input | Hardware lock: program/erase disabled if VPP < 0.8V; enabled at ≥1.65V - eliminates accidental writes |
| RESET | Asynchronous Initialization | Pulls outputs to high-Z and aborts ongoing operations; required to exit error states (e.g., after I/O5=1) |
| BYTE | Mode Selection | Logic-high = x16 word mode; logic-low = x8 byte mode - enables flexible bus-width matching without glue logic |
Key Features
| Feature | Design Value |
|---|---|
| Suspend/Resume for Erase & Program | Enables concurrent read from one sector while erasing/programming another - critical for real-time firmware patching |
| Sector Lockdown | Per-sector write-protection via six-cycle command - secures boot code against corruption during field updates |
| 128-bit Protection Register | Factory-programmed 64-bit ID + user-programmable 64-bit block (lockable) - supports device authentication and secure key storage |
| Three End-of-Operation Detection Methods | RDY/BUSY pin, Data Polling (I/O7), and Toggle Bit (I/O6) - provides software/hardware flexibility for status monitoring |
| Hardware Data Protection | VCC sense, noise filtering (15 ns pulse rejection), and VPP voltage monitoring - prevents spurious writes in noisy or brown-out conditions |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing boot loader, safety-critical firmware, and calibration tables in DIN-rail mounted controllers with extended temperature operation. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector lockdown protecting bootloader integrity and RDY/BUSY signaling for deterministic firmware load timing. Use Value: Enables certified firmware updates without hardware reset; 90 ns access ensures fast startup within IEC 61131-3 scan cycle constraints. | Use Scenario: Retaining device-specific calibration data, regulatory compliance logs, and UI language packs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure parameter storage using 128-bit protection register and sector lockdown to meet IEC 62304 data integrity requirements. Use Value: Prevents unauthorized modification of calibration values; low 10 µA standby current extends battery life between recalibrations. |
| Telecom Base Station Boot ROM | Automotive Infotainment Update Cache |
Use Scenario: Holding baseband processor initialization code and FPGA configuration bitstreams in outdoor macrocell units operating at −40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability boot memory with VPP-based hardware write protection and 200 ms sector erase for field-deployed recovery images. Use Value: Eliminates need for external write-enable logic; TSOP-48 package supports automated optical inspection and thermal cycling reliability. | Use Scenario: Caching over-the-air (OTA) firmware patches prior to validation and installation in head unit ECUs. IC Role / Device Role / Timing Role: Dual-mode (byte/word) interface matches both CAN-FD download buffers and flash controller AXI buses. Use Value: Reduces BOM count by supporting 8-bit diagnostic interfaces and 16-bit high-speed programming paths in same design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201-90-4I-B3K | 3.3V-only supply (3.0–3.6V), 70 ns access, 48-TSOP, no RDY/BUSY pin - uses toggle bit only | Lacks suspend/resume and sector lockdown; simpler command set but no hardware VPP protection | Choose for cost-sensitive, non-security-critical applications where 20 ns faster access offsets missing features |
| MX29LV320ETTI-90G | 3.0V supply, 90 ns access, 48-TSOP, includes RDY/BUSY and VPP, but uses different command sequences and lacks 128-bit protection register | Supports top/bottom boot blocks and CFI query, but no programmable configuration register for status bit behavior | Prefer when CFI-compatibility or standardized JEDEC command set is required over Atmel-specific security features |
Compared with SST39VF3201-90-4I-B3K and MX29LV320ETTI-90G, the AT49LV321-90TI uniquely combines VPP-based hardware write protection, sector lockdown, and a user-lockable 128-bit register - making it the only option among the three qualified for IEC 62443-3-3 Level 1 firmware integrity assurance.
Availability
AT49LV321-90TI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, telecom infrastructure, and automotive infotainment systems requiring stable component supply across extended product lifecycles.
Supply support for AT49LV321-90TI 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 support, documentation, and manufacturing continuity for the AT49LV series.
The AT49LV321-90TI belongs to Atmel's legacy 3.0V Flash memory product line, designed specifically for reliable, secure, in-system programmable storage in resource-constrained embedded systems with stringent data retention and write-protection requirements.
FAQ
What is the difference between AT49LV321-90TI and AT49BV321-90TI?
The AT49LV321-90TI operates from 2.65V to 3.3V, while the AT49BV321-90TI requires 3.0V to 3.6V. Both share identical pinout, command set, and feature set including sector lockdown and RDY/BUSY. The LV variant offers better compatibility with low-voltage 3.0V rails and lower active current (25 mA vs. 30 mA typical), making AT49LV321-90TI preferable for power-sensitive designs. AT49LV321-90TI remains fully functional in systems where AT49BV321-90TI was previously used, provided VCC stays within 2.65–3.3V.
Does AT49LV321-90TI support both byte and word programming modes?
Yes, AT49LV321-90TI supports both modes via the BYTE pin: logic high enables x16 word mode (I/O0–I/O15 active), logic low enables x8 byte mode (I/O0–I/O7 active, I/O15 becomes A−1 address input). This eliminates need for external bus-width translators. The AT49LV321-90TI datasheet confirms this behavior is implemented in silicon and verified across temperature ranges. Unlike AT49LV320-90TI, which is word-only, AT49LV321-90TI's BYTE pin makes it adaptable to 8-bit microcontrollers and 16-bit DSPs alike.
How does the RDY/BUSY pin function on AT49LV321-90TI?
The RDY/BUSY pin on AT49LV321-90TI is an open-drain output that is actively pulled low during internal program or erase cycles and released (high-impedance) upon completion. It supports wired-OR connection with other AT49LV321-90TI devices on the same bus. Unlike polling-based methods, RDY/BUSY provides deterministic hardware timing - critical for real-time systems. The AT49LV321-90TI datasheet specifies maximum suspend latency of 15 µs for erase and 20 µs for program, both detectable via RDY/BUSY transition.
Can AT49LV321-90TI be used without connecting the VPP pin?
No - the VPP pin on AT49LV321-90TI must be connected to a valid voltage source. If left floating or below 0.8V, program and erase operations are inhibited. For normal operation, VPP must be ≥1.65V (typically tied to VCC). The AT49LV321-90TI datasheet explicitly states VPP cannot be left unconnected, and failure to bias it correctly results in failed command execution and persistent I/O3=1 status. Hardware design must include a pull-up or regulated VPP supply; omitting VPP violates AT49LV321-90TI's absolute maximum ratings.
What happens when a locked-down sector is addressed for erase on AT49LV321-90TI?
When a sector locked down via the Sector Lockdown command is targeted for erase on AT49LV321-90TI, the operation terminates within 2 µs and sets the I/O5 (Erase/Program Status) bit high, indicating failure. The AT49LV321-90TI enters status-read mode and requires a Product ID Exit command to return to normal operation. No data is altered in the locked sector. This behavior is guaranteed across all temperature and voltage conditions per the AT49LV321-90TI specification, providing deterministic fault response for safety-critical firmware managers.
AT49LV321-90TI 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
AT49LV321-90TI FAQ
1.How can I place an order for AT49LV321-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV321-90TI 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 AT49LV321-90TI reliable?
The price and inventory of AT49LV321-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV321-90TI is usually 5 days.
3.What payment methods are accepted for AT49LV321-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV321-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV321-90TI?
AT49LV321-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV321-90TI 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 AT49LV321-90TI?
For technical support, including AT49LV321-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV321-90TI requirements.
6.How does Aetrix verify that AT49LV321-90TI is sourced from the original manufacturer or authorized distributors?
All AT49LV321-90TI 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 AT49LV321-90TI meets industry standards.
7.What is the process for return or replacement of AT49LV321-90TI?
All AT49LV321-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV321-90TI, 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 AT49LV321-90TI part is unused and in its original packaging.
Return procedure for AT49LV321-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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