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Microchip Technology AT49BV321T-90TI
- Part No.:
- AT49BV321T-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV321T-90TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,717
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Product details
Overview
AT49BV321T-90TI from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC with sector-erase architecture, 85 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 voltage flexibility (2.65–3.3 V), sector lockdown, and suspend/resume capability are critical.
For engineers reviewing the AT49BV321T-90TI datasheet, AT49BV321T-90TI pinout, AT49BV321T-90TI application, or AT49BV321T-90TI equivalent, this page delivers verified technical context, validated pin functions, real-world use cases for boot code protection and field firmware updates, and confirmed alternative parts with documented functional and packaging differences.
Technical Context
The AT49BV321T-90TI implements a 71-sector erase architecture-63 × 64 KB sectors and 8 × 8 KB sectors-with individual write lockout and hardware-enabled sector lockdown. Its command-set-driven operation uses six-byte sequences for chip/sector erase and lockdown, and supports both standard four-cycle and single-pulse programming modes.
It features dual status reporting: RDY/BUSY open-drain output (active-low during internal cycles) plus software-readable status bits on I/O2–I/O7-including Data Polling (I/O7), Toggle Bit (I/O6), Erase/Program Status (I/O5), and VPP Status (I/O3)-all configurable via a user-settable 2-bit configuration register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8), enabling full BIOS or bootloader storage in compact footprint |
| Access Time | 90 ns max (guaranteed at VCC = 3.0–3.6 V), ensuring compatibility with 11 MHz bus timing in legacy x86 and ARM-based controllers |
| Supply Voltage | 2.65–3.3 V for BV variant - enables direct interface with 3.3 V I/O domains without level shifters |
| Program Time | 15 µs per word - reduces firmware update latency in field-programmable systems |
| Erase Time | 200 ms per sector - allows selective reprogramming without full-chip erase downtime |
| Suspend/Resume | Supported for both program and erase - permits concurrent read-from-safe-sector while erasing another, critical for real-time fail-safe updates |
| Protection Features | 128-bit protection register (factory + user blocks), VPP write-protection pin, and sector lockdown - meets secure boot requirements in industrial gateways |
Pinout & Package
AT49BV321T-90TI is packaged in a 48-lead TSOP Type 1 (Thin Small Outline Package), pin-compatible with industry-standard JEDEC MO-141AC. The BYTE pin enables dynamic selection between x8 (I/O0–I/O7 active, I/O15 = A−1) and x16 (I/O0–I/O15 active) data bus configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 4 MB (x8) or 2 MB (x16) addressing space |
| I/O0–I/O15 / A−1 | Data I/O or LSB Address | In x16 mode: bidirectional 16-bit data path; in x8 mode: I/O0–I/O7 active, I/O15 repurposed as byte-mode LSB address input |
| CE, OE, WE | Chip/Output/Write Enable | Three independent controls prevent bus contention; OE high disables outputs regardless of CE/WE state |
| BYTE | Bus Width Select | Logic high = x16 mode; logic low = x8 mode - enables flexible integration with 8-bit or 16-bit microcontrollers |
| RDY/BUSY | Open-Drain Status Output | Active-low signal indicates ongoing program/erase; supports wired-OR connection across multiple devices on shared bus |
| VPP | Write Protection Input | Must be ≥1.65 V to enable programming/erasing; <0.8 V inhibits all write operations - prevents accidental corruption during power transitions |
| RESET | Hardware Initialization | Pulsing low ≥500 ns forces return to read/standby mode and clears pending suspend states |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Architecture | 71 independently erasable sectors (63 × 64 KB + 8 × 8 KB) - enables granular firmware partitioning and over-the-air differential updates |
| Suspend/Resume Capability | Interruptible erase/program cycles allow safe read access to non-target sectors - essential for hot-swappable module firmware |
| 128-bit Protection Register | Factory-programmed 64-bit block + user-programmable/lockable 64-bit block - supports cryptographic key binding and anti-cloning in secure boot loaders |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and VPP power-on delay (100 ns) - eliminates spurious writes in noisy industrial environments |
| Top/Bottom Boot Block Config | Configurable boot sector location via hardware strapping or command - supports legacy PC BIOS (top-boot) and embedded RTOS (bottom-boot) architectures |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
|
Use Scenario: Storing field-upgradable ladder logic and I/O mapping tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile firmware storage with sector lockdown protecting boot loader and safety-critical routines from overwrite during remote updates. Use Value: 200 ms sector erase time enables background firmware patching without halting control execution; RDY/BUSY pin synchronizes update sequencing with PLC scan cycle. |
Use Scenario: Hosting boot code and configuration images in enterprise-grade routers requiring secure, authenticated firmware loading at power-on. IC Role / Device Role / Timing Role: Secure boot memory with 128-bit protection register storing public keys and hash digests; BYTE pin enables x8 interface with MIPS-based SoC. Use Value: Sector lockdown prevents tampering with boot sector; VPP pin ties to system supervisor IC to disable writes during brown-out conditions. |
| Medical Device Diagnostic Image Cache | Automotive Infotainment System BIOS |
|
Use Scenario: Caching calibration data and diagnostic firmware patches in portable ultrasound units where power loss during update must not corrupt core functionality. IC Role / Device Role / Timing Role: Dual-mode Flash supporting x16 high-speed download from host MCU and x8 low-pin-count interface to auxiliary sensor controller. Use Value: Suspend/resume allows reading cached image metadata while erasing obsolete calibration tables - maintains UI responsiveness during maintenance. |
Use Scenario: Storing UEFI-compliant BIOS and secure boot variables in automotive head units subject to AEC-Q100 Grade 2 temperature requirements. IC Role / Device Role / Timing Role: 3.3 V-only Flash with -40°C to +85°C industrial temp grade; top-boot configuration aligns with OEM BIOS vector table layout. Use Value: 85 ns access time meets tight timing budgets of ARM Cortex-A series boot ROM fetch; RESET pin integrates with vehicle battery monitoring circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201-90-4C-EKE | 32 Mbit, 90 ns, 3.0–3.6 V supply; lacks RDY/BUSY pin and suspend/resume; uses different command set | No hardware suspend capability limits use in real-time systems requiring concurrent read/write; no VPP pin reduces write-protection robustness | Select when cost sensitivity outweighs need for suspend/resume or enhanced security features |
| MX29LV320ETTI-90G | 32 Mbit, 90 ns, 2.7–3.6 V; includes RDY/BUSY but no BYTE pin - fixed x16 interface only | Requires redesign of data bus interface if migrating from x8-capable AT49BV321T-90TI; lacks 128-bit protection register | Choose for drop-in replacement where x16-only interface is acceptable and sector lockdown is not required |
Compared with SST39VF3201-90-4C-EKE and MX29LV320ETTI-90G, the AT49BV321T-90TI uniquely combines byte/word configurability, hardware suspend/resume, and 128-bit security - making it optimal for upgradable embedded systems demanding both flexibility and integrity.
Availability
AT49BV321T-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, medical device diagnostic image caching, and automotive infotainment BIOS applications requiring stable component supply across extended production lifecycles.
Supply support for AT49BV321T-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 support for legacy Atmel Flash products including the AT49BV/LV32X(T) family.
The AT49BV321T-90TI belongs to Atmel's parallel-interface Flash memory product line, designed specifically for reliable, in-system programmable storage in resource-constrained embedded systems requiring secure boot and field firmware updates.
FAQ
What is the operating voltage range for AT49BV321T-90TI?
The AT49BV321T-90TI operates within a single 2.65 V to 3.3 V supply range (BV variant). This narrow voltage window ensures compatibility with 3.3 V logic families and eliminates need for external voltage translation. VPP must be ≥1.65 V for write operations and <0.8 V to inhibit programming - a critical safeguard against unintended writes during power ramp-up or brown-out.
How does the BYTE pin affect AT49BV321T-90TI data bus configuration?
The BYTE pin on AT49BV321T-90TI selects between x8 and x16 operation: logic high enables full 16-bit data transfer on I/O0–I/O15; logic low configures x8 mode where only I/O0–I/O7 are active and I/O15 becomes A−1 (LSB address input). This dual-mode capability allows seamless integration with both 8-bit microcontrollers and 16-bit SoCs without board redesign.
Does AT49BV321T-90TI support sector-level write protection?
Yes, AT49BV321T-90TI supports per-sector write protection via its Sector Lockdown feature. A six-bus-cycle command permanently locks any sector after power-up, making it read-only until next reset or power cycle. This protects boot code and calibration data from accidental or malicious overwrite - a requirement in IEC 62443-compliant industrial firmware designs.
What status reporting methods does AT49BV321T-90TI provide for program/erase completion?
AT49BV321T-90TI offers three complementary status methods: (1) RDY/BUSY open-drain pin (active-low), (2) Data Polling on I/O7, and (3) Toggle Bit on I/O6. All are configurable via a 2-bit register. RDY/BUSY supports hardware interrupt-driven polling; Data Polling and Toggle Bit enable software-driven detection without dedicated pins - giving designers flexibility in resource-constrained systems.
Is AT49BV321T-90TI compatible with legacy AT49BV320T pinout?
No, AT49BV321T-90TI is not pin-compatible with AT49BV320T. While both use 48-lead TSOP packages, AT49BV321T-90TI includes the BYTE pin (pin 32) and RDY/BUSY pin (pin 2), whereas AT49BV320T substitutes these with NC and A19 respectively. Board-level replacement requires layout modification - confirm pin mapping using Figures 1–2 in Rev. 1494H datasheet before migration.
AT49BV321T-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:
- 2.65V ~ 3.3V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSOP
AT49BV321T-90TI FAQ
1.How can I place an order for AT49BV321T-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV321T-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 AT49BV321T-90TI reliable?
The price and inventory of AT49BV321T-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV321T-90TI is usually 5 days.
3.What payment methods are accepted for AT49BV321T-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV321T-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV321T-90TI?
AT49BV321T-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV321T-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 AT49BV321T-90TI?
For technical support, including AT49BV321T-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV321T-90TI requirements.
6.How does Aetrix verify that AT49BV321T-90TI is sourced from the original manufacturer or authorized distributors?
All AT49BV321T-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 AT49BV321T-90TI meets industry standards.
7.What is the process for return or replacement of AT49BV321T-90TI?
All AT49BV321T-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV321T-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 AT49BV321T-90TI part is unused and in its original packaging.
Return procedure for AT49BV321T-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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