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Microchip Technology AT49BV321-11CI
- Part No.:
- AT49BV321-11CI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV321-11CI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,357
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Product details
Overview
AT49BV321-11CI from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC designed for embedded code storage and data logging in industrial control, networking equipment, and legacy system upgrades. It operates at 2.65–3.3V, delivers 85 ns access time, supports sector erase with 63 × 64KB + 8 × 8KB sectors, and features suspend/resume capability for concurrent read/program operations.
For engineers reviewing the AT49BV321-11CI datasheet, AT49BV321-11CI pinout, AT49BV321-11CI application, or AT49BV321-11CI equivalent, this page provides verified technical context, package-specific pin mapping, real-world use scenarios, and validated alternative options - all grounded in the official AT49BV/LV320(T)/321(T) datasheet Rev. 1494H.
Technical Context
The AT49BV321-11CI implements a sector-erasable NOR Flash architecture with dual-mode I/O (byte/word selectable via BYTE pin), enabling flexible integration into 8-bit or 16-bit microcontroller buses. Its command-set-driven operation uses six-byte sequences for chip/sector erase and lockdown, and supports hardware-based write protection via VPP voltage sensing (1.65V threshold) and RESET-initiated initialization.
It integrates an on-chip write state machine that automates internal program/erase pulses, eliminating external timing control. The RDY/BUSY open-drain output (present only on AT49BV321 variants) provides hardware-level cycle completion signaling, while Data Polling (I/O7) and Toggle Bit (I/O6) offer software-based status detection - both configurable via a user-settable status register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8) - supports boot code storage and firmware updates in space-constrained systems. |
| Access Time | 85 ns - enables direct execution (XIP) from Flash in real-time microcontroller applications without wait states. |
| Supply Voltage | 2.65–3.3V - compatible with modern low-voltage 3.3V logic domains and eliminates need for level shifters. |
| Program Time | 15 µs per word - reduces firmware update latency during field upgrades or configuration writes. |
| Sector Erase Time | 200 ms per sector - allows selective reprogramming of application partitions without full chip erase. |
| Standby Current | 10 µA - critical for battery-backed or energy-sensitive embedded systems requiring long-term retention. |
| Operating Temp | -40°C to +85°C - qualified for industrial temperature range, suitable for factory automation and telecom infrastructure. |
Pinout & Package
AT49BV321-11CI is packaged in a 48-pin TSOP Type I (300 mil) surface-mount package, pin-compatible with JEDEC MO-142AC. Pin functions are electrically identical across AT49BV321 variants; the "-11CI" suffix denotes commercial temperature grade (0°C to +70°C) and 85 ns speed grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word addressing; A-1 function multiplexed on I/O15 in byte mode. |
| I/O0–I/O15 | Data I/O (x16) / I/O0–I/O7 + A-1 (x8) | Configurable 8-/16-bit data interface; BYTE pin selects mode - simplifies migration between 8-bit and 16-bit host processors. |
| CE, OE, WE | Chip/Output/Write Enable | Three independent controls prevent bus contention; supports standard microprocessor timing without glue logic. |
| RDY/BUSY | Open-Drain Status Output | Hardware-ready signal for interrupt-driven programming; supports OR-tying of multiple devices on shared bus. |
| VPP | Write Protection Input | Enables/disable program/erase when ≥1.65V; prevents accidental writes during power transitions or noise events. |
| RESET | Device Initialization | Forces read/standby mode and halts active operations - essential for safe power-up sequencing and error recovery. |
| BYTE | Mode Selection | Determines x8/x16 operation; distinguishes AT49BV321 from AT49BV320 (fixed x16-only). |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Architecture | 71 independently erasable sectors (63 × 64KB + 8 × 8KB) - enables granular firmware partitioning and secure bootloader isolation. |
| Erase/Program Suspend | Allows reading from non-erasing sectors during active erase, or reading any location during active programming - enables real-time diagnostics during updates. |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-programmable/lockable block B - supports device authentication and secure key storage. |
| Sector Lockdown | Per-sector write-protection activated via command sequence - preserves boot code integrity while allowing runtime update of application sectors. |
| Hardware Data Protection | VCC sense, noise filtering (15 ns pulse rejection), and VPP validation - prevents spurious writes under brown-out or EMI conditions. |
Applications
| Industrial PLC Firmware Storage | Network Router Boot Code |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random access and sector-level update capability - serves as primary boot memory and parameter retention bank. Use Value: 85 ns access time enables zero-wait-state XIP execution; sector lockdown protects bootloader from corruption during field firmware patches. |
Use Scenario: Holding boot loader, OS kernel image, and configuration tables in enterprise-grade routers requiring high reliability and remote upgrade support. IC Role / Device Role / Timing Role: Primary Flash memory mapped to CPU address space; RDY/BUSY pin synchronizes firmware update routines with hardware readiness. Use Value: Suspend/resume feature allows diagnostic reads during long sector erase cycles - maintains system responsiveness during maintenance windows. |
| Legacy System BIOS Replacement | Medical Device Configuration Memory |
|
Use Scenario: Replacing obsolete EPROMs in aging industrial HMIs and test equipment where PCB layout cannot accommodate new footprints. IC Role / Device Role / Timing Role: Pin- and voltage-compatible drop-in replacement for 27C040/27C080 EPROMs - retains same 48-pin TSOP footprint and 3.3V I/O compatibility. Use Value: Single 2.65–3.3V supply eliminates need for 12V programming voltage; 10 µA standby current extends battery backup life in unpowered states. |
Use Scenario: Storing calibration coefficients, safety-critical configuration parameters, and audit logs in FDA-regulated diagnostic imaging systems. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with 128-bit protection register and sector lockdown - ensures data integrity and regulatory traceability. Use Value: Factory-programmed block A provides unique device ID; user-lockable block B stores encrypted calibration keys - meets IEC 62304 data security 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 | 3.3V-only 32Mbit Flash; 70 ns access; no RDY/BUSY pin; lacks sector suspend/resume and 128-bit protection register. | Lower-cost option for basic firmware storage where concurrent read/program is not required. | Choose when RDY/BUSY signaling and advanced security features are unnecessary - reduces BOM cost but sacrifices flexibility. |
| MX29LV320ETTI-70G | 3.0V 32Mbit Flash; 70 ns access; includes RDY/BUSY; supports CFI query but lacks BYTE pin and 128-bit protection register. | CFI-compliant alternative for standardized flash drivers; suitable for Linux MTD or U-Boot environments. | Prefer when using open-source flash abstraction layers - avoids custom driver development but omits Atmel-specific security features. |
Compared with SST39VF3201-70-4C-EKE and MX29LV320ETTI-70G, AT49BV321-11CI uniquely combines RDY/BUSY signaling, byte/word mode select, sector suspend/resume, and 128-bit protection - making it optimal for safety-critical or field-upgradable embedded systems requiring both performance and security.
Availability
AT49BV321-11CI is available at Aetrix Electronics and suitable for industrial control, network infrastructure, and medical device applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AT49BV321-11CI 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 continues to manufacture, support, and qualify legacy Atmel Flash products including the AT49BV series.
The AT49BV321-11CI belongs to Atmel's parallel-interface NOR Flash product line, engineered for reliable code storage in resource-constrained embedded systems where deterministic timing, sector-level granularity, and hardware-based write protection are essential.
FAQ
What is the operating voltage range for AT49BV321-11CI?
The AT49BV321-11CI operates from 2.65V to 3.3V for read and write operations. This single-supply requirement eliminates the need for separate programming voltages and simplifies power design. The VPP pin must be held ≥1.65V during program/erase cycles; below 0.8V, all write functions are inhibited. The device is not rated for 5V operation.
Does AT49BV321-11CI support both 8-bit and 16-bit data interfaces?
Yes, AT49BV321-11CI supports both modes via the BYTE pin: logic high selects 16-bit (x16) operation with I/O0–I/O15 active; logic low selects 8-bit (x8) operation with I/O0–I/O7 active and I/O15 repurposed as A-1 (LSB address). This differs from AT49BV320, which is x16-only - confirming AT49BV321-11CI's dual-mode capability.
What is the purpose of the RDY/BUSY pin on AT49BV321-11CI?
The RDY/BUSY pin on AT49BV321-11CI is an open-drain output that actively pulls low during internal program or erase cycles and releases (goes high-impedance) upon completion. It enables hardware-synchronized firmware updates and supports OR-tying with other devices on a shared bus - a feature exclusive to the AT49BV321 family, not present on AT49BV320.
How does sector lockdown work on AT49BV321-11CI?
Sector lockdown on AT49BV321-11CI is enabled per sector using a six-bus-cycle command. Once activated, the locked sector becomes read-only: erase and program operations are blocked until the next power cycle or RESET assertion. Lock status can be verified by reading address 00002H within the sector - I/O0 = high indicates lockdown is active. This protects boot code from accidental overwrite.
Can AT49BV321-11CI be used as a direct replacement for AT49BV320-11CI?
No - AT49BV321-11CI is not a pin-compatible replacement for AT49BV320-11CI due to the presence of the BYTE pin and different pinout assignments (e.g., RDY/BUSY replaces NC on AT49BV320). While both share the same 48-pin TSOP package, AT49BV321-11CI requires BYTE pin control and supports x8/x16 mode switching, whereas AT49BV320-11CI is fixed x16-only with no BYTE functionality.
AT49BV321-11CI 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
AT49BV321-11CI FAQ
1.How can I place an order for AT49BV321-11CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV321-11CI 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 AT49BV321-11CI reliable?
The price and inventory of AT49BV321-11CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV321-11CI is usually 5 days.
3.What payment methods are accepted for AT49BV321-11CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV321-11CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV321-11CI?
AT49BV321-11CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV321-11CI 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 AT49BV321-11CI?
For technical support, including AT49BV321-11CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV321-11CI requirements.
6.How does Aetrix verify that AT49BV321-11CI is sourced from the original manufacturer or authorized distributors?
All AT49BV321-11CI 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 AT49BV321-11CI meets industry standards.
7.What is the process for return or replacement of AT49BV321-11CI?
All AT49BV321-11CI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV321-11CI, 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 AT49BV321-11CI part is unused and in its original packaging.
Return procedure for AT49BV321-11CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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