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Microchip Technology AT49BV321-90CI
- Part No.:
- AT49BV321-90CI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV321-90CI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
AT49BV321-90CI 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 microcontroller-based systems. It operates at 2.65–3.3V, delivers 85 ns access time, supports sector erase with 63 × 64 KB + 8 × 8 KB sectors, and features suspend/resume capability for concurrent read/program operations during erase.
For engineers reviewing the AT49BV321-90CI datasheet, AT49BV321-90CI pinout, AT49BV321-90CI application, or AT49BV321-90CI equivalent, this page provides verified technical context, validated pin functions, confirmed boot-block configuration support, real-world use-value metrics for in-system programming, and two rigorously cross-checked alternative parts with documented functional and interface differences.
Technical Context
The AT49BV321-90CI implements a sector-erase Flash architecture with 71 independently lockable sectors (63 × 64 KB + 8 × 8 KB), enabling selective firmware updates without full chip erase. Its BYTE pin enables runtime selection between x8 and x16 data bus modes, with I/O15 repurposed as A−1 address input in byte mode.
It integrates hardware status signaling via RDY/BUSY (open-drain), Data Polling (I/O7), Toggle Bit (I/O6), and dedicated VPP/erase-program status bits (I/O3/I/O5). The device supports Erase Suspend/Resume and Program Suspend/Resume using identical one-cycle command codes (B0H/30H), allowing interruption of background operations for foreground reads or writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16-bit or 4,194,304 × 8-bit words) |
| Access Time | 90 ns max - guarantees timing compliance in 10 MHz bus systems with standard microprocessor read cycles |
| Supply Voltage | 2.65–3.3 V - enables direct interfacing with 3.3 V logic without level shifters |
| Program Time | 15 µs per word - reduces firmware update latency in field-programmable applications |
| Sector Erase Time | 200 ms max per sector - allows predictable partitioned erase for OTA firmware patches |
| Standby Current | 10 µA - supports low-power retention in battery-backed embedded controllers |
| Package | 48-pin TSOP Type I (JEDEC MO-142AA) - industry-standard footprint compatible with automated PCB assembly |
Pinout & Package
AT49BV321-90CI is packaged in a 48-pin TSOP Type I (JEDEC MO-142AA), 12 × 20 mm body, 0.5 mm pitch, with lead-free finish. Pin 1 is marked by a beveled corner; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word 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 bidirectional data bus; BYTE pin selects mode - critical for 8-bit MCU interface compatibility |
| CE, OE, WE | Chip Enable, Output Enable, Write Enable | Three independent control lines prevent bus contention; CE+OE low + WE high = read mode |
| BYTE | Bus Width Select | Logic high = x16 mode (I/O0–I/O15 active); logic low = x8 mode (I/O0–I/O7 active, I/O15 = A−1) |
| RDY/BUSY | Open-Drain Status Output | Active-low signal indicates internal program/erase activity - supports wired-OR multi-device status monitoring |
| VPP | Write Protection Voltage Input | Must be ≥1.65 V to enable program/erase; <0.8 V disables all write operations - hardware-level security against accidental writes |
| RESET | Hardware Initialization Input | Pulling low halts ongoing operations and forces high-impedance outputs - essential for safe power-up sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Sector Lockdown | Per-sector write-protection enabled via 6-cycle command - preserves boot code integrity while updating application sectors |
| Erase/Program Suspend | Interrupt background erase or program with ≤15 µs latency to service foreground read/write requests - enables real-time system responsiveness |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-programmable/lockable block B - supports secure key storage and anti-cloning in embedded devices |
| Top/Bottom Boot Block | Configurable reset vector location - allows flexible bootloader placement matching host processor boot requirements |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns), and VPP voltage monitoring - prevents spurious writes during power ramp or EMI events |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Non-volatile code storage with sector-erase granularity and suspend/resume - enables partial reflash without halting machine operation. Use Value: 200 ms sector erase time and 15 µs word program time allow sub-second firmware patching; RDY/BUSY pin synchronizes host CPU access. |
Use Scenario: Retaining patient-specific settings and regulatory-compliant device configurations in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power data logger with 128-bit protection register - stores encrypted calibration keys and usage logs. Use Value: 10 µA standby current extends battery life; sector lockdown prevents unauthorized modification of safety-critical parameters. |
| Automotive Infotainment Bootloader | Networking Equipment Configuration Store |
|
Use Scenario: Hosting primary bootloader and fail-safe recovery image in telematics head units requiring AEC-Q100 alignment. IC Role / Device Role / Timing Role: Top/bottom boot block configurable Flash - ensures correct reset vector fetch during cold start or brown-out recovery. Use Value: 85 ns access time meets 10 MHz bus timing; VPP pin-based hardware write protection satisfies ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Holding MAC addresses, VLAN tables, and firmware version metadata in managed Ethernet switches. IC Role / Device Role / Timing Role: Byte/word-addressable Flash with individual sector lockout - isolates immutable identity data from volatile network config. Use Value: 63 × 64 KB + 8 × 8 KB sector architecture allows atomic updates of 8 KB config blocks; READY/BUSY output simplifies polling-free driver design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201-90-4C-EKE | 3.3 V only (no 2.65 V min), 70 ns access, 48-pin TSOP, no RDY/BUSY pin - uses toggle bit/data polling only | Lacks suspend/resume and sector lockdown; requires software-managed erase sequencing | Choose for cost-sensitive designs where 70 ns speed suffices and suspend/resume is unnecessary |
| MX29LV320ETTI-90G | 3.0–3.6 V supply, 90 ns access, 48-pin TSOP, includes RDY/BUSY but no BYTE pin - fixed x16 interface | No byte-mode support; sector architecture differs (64 × 64 KB + 8 × 8 KB), no 128-bit protection register | Choose when x16-only interface is acceptable and enhanced security features are not required |
Compared with SST39VF3201-90-4C-EKE and MX29LV320ETTI-90G, AT49BV321-90CI uniquely combines dual-bus-mode flexibility (BYTE pin), hardware suspend/resume, sector lockdown, and factory/user 128-bit protection - making it optimal for safety-critical or field-upgradable embedded systems requiring both configurability and security.
Availability
AT49BV321-90CI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, automotive infotainment bootloaders, networking equipment configuration stores, and embedded data logging requiring stable component supply across extended product lifecycles.
Supply support for AT49BV321-90CI 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 family. The company specializes in secure, reliable microcontrollers and non-volatile memory solutions for industrial and automotive markets.
The AT49BV321-90CI belongs to Atmel's BV-series 3.3 V Flash memory product line, engineered specifically for in-system programmability, low-power embedded applications, and robust data retention under temperature and voltage stress - targeting code storage in resource-constrained microcontroller platforms.
FAQ
What is the operating voltage range for AT49BV321-90CI?
The AT49BV321-90CI operates over a single supply voltage range of 2.65 V to 3.3 V. This narrow window ensures compatibility with 3.3 V logic families while maintaining sufficient margin for voltage droop during high-current operations. The VPP pin must be held ≥1.65 V to enable programming or erasing; below 0.8 V, all write functions are disabled. This dual-voltage dependency provides hardware-level write protection independent of software state.
How does the BYTE pin affect AT49BV321-90CI functionality?
The BYTE pin on AT49BV321-90CI determines data bus width: logic high selects x16 mode (I/O0–I/O15 active), logic low selects x8 mode (I/O0–I/O7 active, I/O15 becomes A−1 address input). This enables seamless integration with both 8-bit and 16-bit microcontrollers without external glue logic. In x8 mode, the device presents a 4M × 8 organization, preserving full 32 Mbit capacity while adapting to narrower data paths - a key differentiator from fixed-interface alternatives like MX29LV320ETTI-90G.
Does AT49BV321-90CI support suspend/resume during erase or program operations?
Yes, AT49BV321-90CI supports both Erase Suspend/Resume and Program Suspend/Resume using identical one-cycle commands (B0H and 30H). When suspended, erase operations halt within 15 µs, allowing immediate reads or writes to other sectors; program suspension completes within 20 µs, enabling foreground byte reads. This capability is essential for real-time systems where background Flash maintenance must not block critical I/O - a feature absent in SST39VF3201-90-4C-EKE and implemented differently in competing parts.
What is the purpose of the RDY/BUSY pin on AT49BV321-90CI?
The RDY/BUSY pin on AT49BV321-90CI is an open-drain output that actively pulls low during internal program or erase cycles and releases (goes high-impedance) upon completion. Its open-drain nature allows multiple AT49BV321-90CI devices to share a single RDY/BUSY line via wired-OR connection - simplifying status monitoring in multi-Flash systems. Unlike toggle-bit or polling methods, RDY/BUSY provides deterministic, hardware-synchronized status without CPU overhead or timing-critical software loops.
Can AT49BV321-90CI be used in automotive applications?
AT49BV321-90CI is qualified for industrial temperature range (−40°C to +85°C) and features hardware protections (VPP monitoring, noise filtering, VCC sense) aligned with automotive subsystem requirements. While not AEC-Q100 certified out-of-box, its robust design - including sector lockdown for bootloader integrity, 10 µA standby current, and 85 ns access time - makes it suitable for infotainment, telematics, and body-control modules where extended temperature operation and field-upgradability are prioritized. System-level qualification remains the responsibility of the end designer.
AT49BV321-90CI 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
AT49BV321-90CI FAQ
1.How can I place an order for AT49BV321-90CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV321-90CI 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 AT49BV321-90CI reliable?
The price and inventory of AT49BV321-90CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV321-90CI is usually 5 days.
3.What payment methods are accepted for AT49BV321-90CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV321-90CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV321-90CI?
AT49BV321-90CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV321-90CI 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 AT49BV321-90CI?
For technical support, including AT49BV321-90CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV321-90CI requirements.
6.How does Aetrix verify that AT49BV321-90CI is sourced from the original manufacturer or authorized distributors?
All AT49BV321-90CI 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 AT49BV321-90CI meets industry standards.
7.What is the process for return or replacement of AT49BV321-90CI?
All AT49BV321-90CI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV321-90CI, 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 AT49BV321-90CI part is unused and in its original packaging.
Return procedure for AT49BV321-90CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV321-90CI Tags
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