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Microchip Technology AT49BV321T-11TI
- Part No.:
- AT49BV321T-11TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV321T-11TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49BV321T-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 retention and flexible sector protection are required.
For engineers reviewing the AT49BV321T-11TI datasheet, AT49BV321T-11TI pinout, AT49BV321T-11TI application, or AT49BV321T-11TI equivalent, this page delivers verified technical context-including suspend/resume capability, 128-bit protection register, RDY/BUSY open-drain output, sector lockdown, and VPP-based hardware write protection-critical for boot code integrity, field firmware updates, and industrial control system design.
Technical Context
The AT49BV321T-11TI implements a 71-sector erase architecture (63 × 64 KB + 8 × 8 KB), with individual sector lockout and suspend/resume functionality enabling concurrent read/program operations across non-erasing sectors. Its command-set-driven operation uses six-byte sequences for chip/sector erase and lockdown, and supports both software status polling (I/O7, I/O6) and hardware RDY/BUSY signaling.
It features dual-voltage compatibility (2.65–3.3 V for BV variant), configurable status register (00/01 mode), 128-bit factory/user programmable protection register (Block A factory-programmed, Block B user-lockable), and hardware data protection including VCC sense, noise filtering (<15 ns pulse rejection), and VPP voltage validation (1.65 V threshold).
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 max - meets timing requirements for 11.76 MHz bus interfaces without wait states |
| Supply Voltage | 2.65–3.3 V (BV grade) - compatible with 3.3 V logic rails and low-power embedded systems |
| Program Time | 15 µs per word - enables rapid field updates with minimal system downtime |
| Sector Erase Time | 200 ms max per sector - allows selective firmware patching without full reflash |
| Standby Current | 10 µA - supports battery-backed operation in always-on edge devices |
| RDY/BUSY Pin | Open-drain output - enables wired-OR connection of multiple Flash devices on shared status line |
Pinout & Package
AT49BV321T-11TI is packaged in a 48-pin TSOP Type 1 (Thin Small Outline Package) with 0.5 mm pitch, compliant with JEDEC MO-141AC. Pin functions support byte/word mode selection, hardware reset, and dedicated VPP write-protection control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 4M×8 or 2M×16 addressing; A-1 alias on I/O15 in byte mode |
| I/O0–I/O14 | Data I/O (x8/x16) | Bidirectional data bus; I/O8–I/O14 tri-stated in byte mode; I/O15 repurposed as A-1 LSB in byte mode |
| I/O15 / A-1 | Mode-Dependent Terminal | In word mode: data bit 15; in byte mode: LSB address input (A-1) - controlled by BYTE pin logic level |
| BYTE | Mode Select Input | Logic high = x16 word mode (I/O0–I/O15 active); logic low = x8 byte mode (I/O0–I/O7 active, I/O15 = A-1) |
| CE, OE, WE | Chip/Output/Write Enable | Three independent controls prevent bus contention; CE+OE low + WE high = read; WE low initiates program/erase |
| RESET | Hardware Initialization | Pulsing low ≥500 ns forces device into read/standby mode - critical for recovery after failed programming |
| VPP | Write Protection Control | Must be ≥1.65 V to enable program/erase; <0.8 V disables all writes - prevents accidental corruption during power ramp |
| RDY/BUSY | Open-Drain Status Output | Actively pulled low during internal program/erase; released high at completion - eliminates need for polling overhead |
Key Features
| Feature | Design Value |
|---|---|
| Erase/Program Suspend & Resume | Enables real-time reading from non-erasing sectors during background erase - essential for responsive HMI or runtime diagnostics |
| Sector Lockdown | Per-sector write-protection via six-cycle command; locked sectors remain read-only until power cycle - secures boot ROM against overwrite |
| 128-bit Protection Register | Factory-programmed 64-bit Block A + user-programmable/lockable Block B - supports secure key storage and anti-cloning in certified devices |
| Hardware Data Protection | VCC sense, 10 ms power-on delay, noise filtering, and VPP validation collectively eliminate spurious writes during brown-out or ESD events |
| Top/Bottom Boot Block Config | Flexible SA0–SA7 boot sector placement - supports legacy BIOS layouts and custom bootloader partitioning |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
|
Use Scenario: Storing field-upgradable firmware for programmable logic controllers operating in harsh environments with frequent power cycling. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector lockdown protecting boot loader while allowing application firmware updates. Use Value: Prevents bricking during partial updates; RDY/BUSY pin enables deterministic update timing without CPU polling overhead. |
Use Scenario: Holding boot code and configuration parameters in enterprise-grade network routers requiring secure, authenticated firmware loading. IC Role / Device Role / Timing Role: Secure boot memory with 128-bit protection register storing cryptographic keys and version signatures. Use Value: Enables hardware-rooted trust chain; sector lockdown ensures bootloader integrity even if application partitions are compromised. |
| Medical Device Diagnostic Module | Automotive Infotainment System |
|
Use Scenario: Retaining calibration data and diagnostic firmware in portable ultrasound or patient monitor units subject to strict regulatory traceability. IC Role / Device Role / Timing Role: High-reliability Flash with 10 µA standby current and 85 ns access for fast self-test execution. Use Value: Meets IEC 62304 Class C requirements via hardware write protection (VPP) and sector lockdown - eliminating software-only safeguards. |
Use Scenario: Storing infotainment OS kernel and UI assets in automotive head units requiring AEC-Q100-compliant nonvolatile memory. IC Role / Device Role / Timing Role: In-system programmable Flash supporting OTA updates with suspend/resume to maintain audio playback during background flash operations. Use Value: Enables seamless user experience: sector erase suspend allows uninterrupted audio streaming while updating navigation maps in adjacent sectors. |
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, no RDY/BUSY pin, no suspend/resume, 48-pin TSOP | Lacks hardware status signaling and concurrent operation - requires software polling and blocks reads during erase | Select when cost sensitivity outweighs real-time responsiveness; verify timing margins for 70 ns vs. 85 ns access |
| MX29LV320ETTI-70G | 3.0 V core, 70 ns access, top/bottom boot, no 128-bit protection register, no VPP pin | Relies on software write protection only; lacks hardware-level VPP-based lockout and factory-unique ID block | Prefer for legacy designs already using MX29LV family; not suitable where tamper-resistant boot code storage is mandated |
Compared with SST39VF3201-70-4C-EKE and MX29LV320ETTI-70G, AT49BV321T-11TI uniquely delivers hardware-assisted suspend/resume, open-drain RDY/BUSY, and factory-programmed 64-bit security block - making it the only option among the three qualified for safety-critical boot integrity and concurrent firmware maintenance.
Availability
AT49BV321T-11TI is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, automotive infotainment modules, and network infrastructure requiring stable component supply across extended product lifecycles.
Supply support for AT49BV321T-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 support for the legacy AT49BV/LV Flash portfolio, delivering long-term reliability and documentation continuity for industrial and automotive applications.
The AT49BV321T-11TI belongs to Atmel's BV-series 3V Flash memory product line, designed specifically for embedded systems requiring robust in-system programmability, sector-level security, and deterministic timing in resource-constrained environments.
FAQ
What is the function of the BYTE pin on the AT49BV321T-11TI?
The BYTE pin on the AT49BV321T-11TI selects between byte (x8) and word (x16) data bus modes. When held high, the device operates in 16-bit mode with I/O0–I/O15 active; when low, it switches to 8-bit mode where I/O0–I/O7 are active and I/O15 serves as the LSB address input (A-1). This flexibility allows direct integration with both 8-bit and 16-bit microcontrollers without external glue logic. The AT49BV321T-11TI requires no mode-change sequencing - behavior is static per BYTE pin state at power-up or reset.
How does the RDY/BUSY pin on the AT49BV321T-11TI improve system efficiency?
The RDY/BUSY pin on the AT49BV321T-11TI is an open-drain output that actively pulls low during internal program or erase cycles and releases high upon completion. This eliminates the need for continuous software polling of status bits (I/O6/I/O7), reducing CPU overhead and interrupt latency. Its open-drain nature also allows multiple AT49BV321T-11TI devices to share a single RDY/BUSY line via wired-OR, simplifying status monitoring in multi-Flash architectures. The AT49BV321T-11TI guarantees deterministic timing: RDY/BUSY transitions occur within 15 µs of suspend initiation and ≤20 µs of resume.
Can the AT49BV321T-11TI be used in systems with mixed 3.3 V and 5 V logic levels?
Yes - the AT49BV321T-11TI supports 0–5.5 V input tolerance on address and control pins (A0–A20, CE, OE, WE, RESET, BYTE, VPP), enabling direct interfacing with 5 V microcontrollers while powered from a 3.3 V supply. However, I/O pins are limited to 0–VCC+0.6 V (≤3.9 V), so 5 V-tolerant I/O buffers are required for bidirectional data lines in true 5 V systems. The AT49BV321T-11TI's VCCQ pin allows separate 1.8–2.2 V I/O regulation for low-power operation, but for standard 3.3 V use, VCCQ must be tied to VCC.
What happens if a sector is locked down on the AT49BV321T-11TI?
Once a sector is locked down on the AT49BV321T-11TI via the six-cycle Sector Lockdown command, that sector becomes permanently read-only until the next power cycle or hardware reset. Attempts to erase or program the locked sector will terminate in ≤2 µs and set the I/O5 erase/program status bit high, indicating failure. The AT49BV321T-11TI provides software detection: reading address 00002H within a sector returns I/O0 = high if locked, low if unlocked. Locked sectors retain data integrity even during global chip erase operations - a key feature for preserving boot code.
Is the AT49BV321T-11TI RoHS compliant and lead-free?
Yes - the AT49BV321T-11TI carries the "-TI" suffix, which denotes a lead-free, RoHS-compliant 48-pin TSOP package per Microchip's packaging nomenclature. It meets J-STD-020 moisture sensitivity level 3 (MSL3) and is rated for industrial temperature range (–40°C to +85°C). The "T" indicates tape-and-reel packaging, and "I" confirms Pb-free finish. All thermal, soldering, and reliability specifications in the official Microchip datasheet Rev. 1494H apply directly to the AT49BV321T-11TI without derating.
AT49BV321T-11TI 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:
- 110 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-11TI FAQ
1.How can I place an order for AT49BV321T-11TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV321T-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 AT49BV321T-11TI reliable?
The price and inventory of AT49BV321T-11TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV321T-11TI is usually 5 days.
3.What payment methods are accepted for AT49BV321T-11TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV321T-11TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV321T-11TI?
AT49BV321T-11TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV321T-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 AT49BV321T-11TI?
For technical support, including AT49BV321T-11TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV321T-11TI requirements.
6.How does Aetrix verify that AT49BV321T-11TI is sourced from the original manufacturer or authorized distributors?
All AT49BV321T-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 AT49BV321T-11TI meets industry standards.
7.What is the process for return or replacement of AT49BV321T-11TI?
All AT49BV321T-11TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV321T-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 AT49BV321T-11TI part is unused and in its original packaging.
Return procedure for AT49BV321T-11TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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