My Inquiry
My Account
Microchip Technology AT49BV321-11TI
- Part No.:
- AT49BV321-11TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 46-TFBGA
- Datasheet:
-
AT49BV321-11TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 46UBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49BV321-11TI 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 reliable nonvolatile code storage and flexible sector protection are required.
For engineers reviewing the AT49BV321-11TI datasheet, AT49BV321-11TI pinout, AT49BV321-11TI application, or AT49BV321-11TI equivalent, key selection considerations include its 2.65–3.3 V operating range, 71-sector erase granularity (63 × 64 KB + 8 × 8 KB), suspend/resume capability for concurrent read/program during erase, RDY/BUSY open-drain output, and hardware write protection via VPP and sector lockdown.
Technical Context
The AT49BV321-11TI implements a command-register-based architecture with six-byte unlock sequences for chip/sector erase and program operations. Its internal write state machine handles pulse generation, timing, and status reporting via I/O pins (I/O5, I/O6, I/O7) and the dedicated RDY/BUSY pin.
It features two distinct operational modes: word mode (I/O0–I/O15 active) when BYTE = 1, and byte mode (I/O0–I/O7 active, I/O15 repurposed as A−1 LSB address) when BYTE = 0. Sector lockdown and 128-bit protection register (factory-block A + user-lockable block B) provide secure boot code retention and firmware integrity control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8), enabling full BIOS/firmware images in compact footprint |
| Access Time | 85 ns - ensures compatibility with legacy 80 MHz bus interfaces without wait states |
| Supply Voltage | 2.65 V to 3.3 V - supports low-power 3.3 V systems while maintaining backward compatibility with 3.0 V designs |
| Sector Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB - allows fine-grained firmware updates without erasing entire memory |
| Program Time | 15 µs per word/byte - enables fast field updates and reduces system downtime during reprogramming |
| Erase Time | 200 ms per sector - balances speed and reliability for production and field firmware patching |
| Standby Current | 10 µA - critical for battery-backed or always-on embedded applications requiring ultra-low quiescent power |
Pinout & Package
AT49BV321-11TI is packaged in a 48-pin TSOP Type 1 (Thin Small Outline Package) with standard JEDEC MO-143AC footprint. Pin functions are electrically and physically identical across AT49BV/LV321(T) variants; the "-11TI" suffix denotes industrial temperature grade (−40°C to +85°C) and lead-free finish.
| 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/O14 | Data I/O (x16) / Data I/O (x8) | Bi-directional data bus; I/O15 serves as A−1 in byte mode, enabling seamless x8/x16 interface adaptation |
| I/O15 / A−1 | Mode-Dependent Terminal | Configurable via BYTE pin: I/O15 = data bit 15 (word mode) or LSB address input A−1 (byte mode) |
| BYTE | Bus Width Select | Logic level determines data bus width - eliminates need for external multiplexing logic in mixed-interface systems |
| CE, OE, WE | Chip/Output/Write Enable | Three independent controls prevent bus contention and support standard microprocessor timing protocols |
| RDY/BUSY | Open-Drain Status Output | Active-low signal indicates internal program/erase activity; supports wired-OR of multiple devices on shared status line |
| VPP | Write Protection Voltage | Must be ≥1.65 V for erase/program; <0.8 V disables all writes - provides hardware-level security against accidental corruption |
| RESET | Hardware Initialization | Asynchronous reset halts ongoing operations and forces device into read/standby mode - essential for recovery after power glitches |
Key Features
| Feature | Design Value |
|---|---|
| Erase/Program Suspend & Resume | Allows reading from or programming any non-erasing sector while another sector is being erased - enables real-time firmware updates without halting system execution |
| Sector Lockdown | Per-sector write-protection activated via 6-cycle command; locked sectors remain read-only until power cycle - secures boot loader and calibration data |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-programmable/lockable block B - supports cryptographic key storage and anti-cloning mechanisms |
| Hardware Data Protection | Five-layer safeguard: VCC sense, VPP threshold, noise filtering (<15 ns), CE/OE/WE inhibit, and VPP power-on delay - prevents spurious writes under noisy or brown-out conditions |
| Status Detection Options | Triple-method end-of-operation signaling: RDY/BUSY pin, Data Polling (I/O7), and Toggle Bit (I/O6) - gives designers flexibility to match host controller capabilities |
Applications
| Embedded Controller Firmware Storage | Industrial PLC Boot Memory |
|---|---|
|
Use Scenario: Storing boot code and runtime firmware for ARM Cortex-M or RISC-V microcontrollers in factory automation equipment. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level write protection; RDY/BUSY synchronizes firmware updates with real-time task scheduling. Use Value: Enables safe over-the-air (OTA) updates by locking boot sector while updating application sectors - eliminates risk of bricking during partial writes. |
Use Scenario: Retaining configuration parameters and safety-critical startup routines in programmable logic controllers deployed in harsh environments. IC Role / Device Role / Timing Role: Industrial-grade Flash memory with −40°C to +85°C operation; sector lockdown preserves certified safety firmware across power cycles. Use Value: 10 µA standby current extends battery backup life; 85 ns access time meets deterministic scan cycle timing requirements. |
| BIOS/UEFI Module in Edge Gateways | Medical Device Diagnostic Firmware |
|
Use Scenario: Hosting BIOS/UEFI firmware in fanless edge computing gateways used in smart city infrastructure. IC Role / Device Role / Timing Role: Primary boot memory interfaced via x16 parallel bus; VPP pin tied to regulated 3.3 V to enforce hardware write lock during normal operation. Use Value: 71-sector architecture allows modular firmware updates (e.g., network stack only) without re-flashing entire BIOS image - reduces field service time. |
Use Scenario: Storing FDA-cleared diagnostic algorithms and calibration data in portable ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: Secure nonvolatile memory with 128-bit protection register; sector lockdown prevents unauthorized modification of clinical algorithms. Use Value: Factory-programmed block A provides immutable device identity; user-lockable block B stores site-specific calibration - satisfies IEC 62304 traceability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201-70-4C-EKE | 3.3 V only, 70 ns access, 48-pin TSOP, no RDY/BUSY pin, no VPP pin, no sector suspend | Lacks suspend/resume and hardware write protection - suitable only for static firmware with infrequent updates | Choose when cost sensitivity outweighs need for in-field update safety and concurrent operation. |
| MX29LV320ETXGI-90G | 3.0 V core, 90 ns access, 48-pin TSOP, supports CFI, no BYTE pin, no 128-bit protection register | CFI-compliant but lacks byte/word mode flexibility and advanced security features - targets generic BIOS replacement | Prefer for legacy PC motherboard designs requiring CFI-standardized drivers and broad software toolchain support. |
Compared with SST39VF3201-70-4C-EKE and MX29LV320ETXGI-90G, the AT49BV321-11TI uniquely combines byte/word mode adaptability, hardware VPP write lock, sector suspend/resume, and 128-bit protection - making it optimal for safety-critical, updatable embedded systems where firmware integrity and real-time operation coexist.
Availability
AT49BV321-11TI is available at Aetrix Electronics and suitable for embedded controller firmware storage, industrial PLC boot memory, BIOS/UEFI modules in edge gateways, medical device diagnostic firmware, and secure firmware update subsystems requiring stable component supply across extended product lifecycles.
Supply support for AT49BV321-11TI 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 AT49BV/LV32X family. Microchip is a global leader in microcontrollers, analog, and Flash memory solutions with ISO 9001-certified fabrication and test facilities.
The AT49BV321-11TI belongs to Microchip's legacy parallel-interface Flash memory product line, designed specifically for reliable, low-power, in-system programmable code storage in industrial, medical, and communications equipment where long-term availability and robustness are mandatory.
FAQ
What is the operating voltage range for AT49BV321-11TI?
The AT49BV321-11TI operates from 2.65 V to 3.3 V for both read and write functions. This single-supply range eliminates the need for separate VCC and VPP regulators in most designs. The VPP pin must be held ≥1.65 V for program/erase operations and <0.8 V to inhibit writes - ensuring hardware-level data protection under all operating conditions. AT49BV321-11TI maintains full functionality across this range, including 85 ns access time and 15 µs program time.
How does the BYTE pin affect AT49BV321-11TI operation?
The BYTE pin on AT49BV321-11TI selects between x16 and x8 data bus configurations: logic high enables full 16-bit I/O (I/O0–I/O15), while logic low activates byte mode where only I/O0–I/O7 are active and I/O15 functions as address bit A−1. This eliminates external bus-width translation logic. AT49BV321-11TI's pinout and timing remain identical in both modes, simplifying PCB design for multi-platform firmware deployment.
Does AT49BV321-11TI support sector erase suspend and resume?
Yes, AT49BV321-11TI supports both Erase Suspend and Program Suspend commands. When suspending an erase operation, the device halts within 15 µs and allows reads or programming from any other sector. Similarly, program suspension (≤20 µs latency) permits reading any location during active programming. Resume commands restore the suspended operation. This capability is confirmed in the datasheet's "Erase Suspend/Resume" and "Program Suspend/Resume" sections and is unique to the AT49BV/LV321(T) variant.
What is the purpose of the VPP pin on AT49BV321-11TI?
The VPP pin on AT49BV321-11TI provides hardware-level write protection: program and erase functions are disabled when VPP < 0.8 V, and enabled only when VPP ≥ 1.65 V. It must never be left floating. This feature prevents accidental firmware corruption during power-up/down transients or system noise events. AT49BV321-11TI's VPP circuitry is internally monitored, and a status bit (I/O3) reports VPP level violations - enabling fail-safe detection in safety-critical applications.
Can AT49BV321-11TI be used in place of AT49BV320-11TI?
No - AT49BV321-11TI and AT49BV320-11TI are not functionally interchangeable. AT49BV321-11TI includes the BYTE pin for x8/x16 mode selection and supports RDY/BUSY output, whereas AT49BV320-11TI operates exclusively in x16 mode and lacks both BYTE and RDY/BUSY pins. Their pinouts differ: AT49BV320-11TI uses pin 37 for NC, while AT49BV321-11TI assigns it to RDY/BUSY. Substituting one for the other requires PCB redesign and firmware adaptation.
AT49BV321-11TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 46-TFBGA
- 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:
- 110 ns
- Voltage - Supply:
- 2.65V ~ 3.3V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 46-µBGA (7.6x10.4)
AT49BV321-11TI FAQ
1.How can I place an order for AT49BV321-11TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV321-11TI 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 AT49BV321-11TI reliable?
The price and inventory of AT49BV321-11TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV321-11TI is usually 5 days.
3.What payment methods are accepted for AT49BV321-11TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV321-11TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV321-11TI?
AT49BV321-11TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV321-11TI 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 AT49BV321-11TI?
For technical support, including AT49BV321-11TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV321-11TI requirements.
6.How does Aetrix verify that AT49BV321-11TI is sourced from the original manufacturer or authorized distributors?
All AT49BV321-11TI 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 AT49BV321-11TI meets industry standards.
7.What is the process for return or replacement of AT49BV321-11TI?
All AT49BV321-11TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV321-11TI, 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 AT49BV321-11TI part is unused and in its original packaging.
Return procedure for AT49BV321-11TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV321-11TI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
