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Microchip Technology AT49BV320ST-70CU
- Part No.:
- AT49BV320ST-70CU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 64-VBGA, CSPBGA
- Datasheet:
-
AT49BV320ST-70CU.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 64CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
AT49BV320ST-70CU from Atmel is a 32-Mbit (2M × 16) single-supply Flash memory with 70 ns access time, sector-erase architecture (63 × 64KB + 8 × 8KB sectors), and CBGA-64 packaging. It supports in-system programming, suspend/resume for erase/program operations, and features secure lock/freeze for irreversible region protection. Used in embedded firmware storage requiring field-upgradable code and tamper-resistant boot sectors.
For engineers reviewing the AT49BV320ST-70CU datasheet, AT49BV320ST-70CU pinout, AT49BV320ST-70CU application, or AT49BV320ST-70CU equivalent, key selection criteria include 2.65–3.6V operation, CFI compliance, top-boot block configuration, 100,000 erase cycles, and VPP-assisted accelerated programming - all critical for industrial control firmware retention and secure bootloader implementation.
Technical Context
The AT49BV320ST-70CU implements a top-boot block configuration with 71 total sectors: 63 sectors of 64KB (32K words) and 8 sectors of 8KB (4K words), where the smallest 8 sectors occupy the highest address range (1F8000–1FFFFF). Its Common Flash Interface (CFI) enables host system auto-configuration and supports both standard and secure sector locking via software commands.
Secure lock permanently disables program/erase in selected 64KB regions after activation; freeze mode irreversibly locks the secure status. Suspend/resume allows concurrent read/program from one sector while erasing another, enabling real-time firmware updates without halting system execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16-bit words) - supports full firmware images for mid-complexity microcontrollers. |
| Access Time | 70 ns - ensures deterministic timing for CPU wait-state-free reads in 33 MHz bus systems. |
| Voltage Range | 2.65 V to 3.6 V - compatible with 3.3 V logic rails and eliminates need for dual-voltage supply. |
| Sector Architecture | 63 × 64KB + 8 × 8KB sectors - enables granular firmware partitioning (e.g., separate boot, config, app sections). |
| Erase Endurance | 100,000 cycles - sufficient for field firmware updates over 10+ years in industrial equipment. |
| Program Time | 10 µs per word - enables fast patching of small code segments during runtime. |
| Standby Current | 15 µA - minimizes power draw in battery-backed or low-power sleep modes. |
| Package | 64-ball CBGA (9 × 10 × 1.0 mm, 1.0 mm pitch) - compact footprint for space-constrained PCB layouts. |
Pinout & Package
AT49BV320ST-70CU uses a 64-ball Chip-scale Ball Grid Array (CBGA) package compliant with RoHS, Pb/Halide-free standards. The package has an 8×8 array layout with 1.0 mm ball pitch and 9 mm × 10 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word addressing; A20 selects upper 1MB boundary. |
| I/O0–I/O15 | Data Bus | 16-bit bidirectional data path for read/write transfers; matches 16-bit microcontroller interfaces. |
| CE | Chip Enable | Active-low chip select; enables device decoding on shared memory buses with multiple peripherals. |
| OE | Output Enable | Controls output buffer; allows read operations without affecting other bus drivers. |
| WE | Write Enable | Controls write latching; used with CE/OE to define read vs. write cycles per JEDEC standards. |
| VPP | Program Voltage | Provides elevated voltage for accelerated programming and write protection; tied to VCC during normal operation. |
| RESET | Hardware Reset | Asynchronous reset input that clears internal state and returns device to read mode. |
| VCCQ | I/O Power Supply | Separate 3.3 V supply for I/O buffers - isolates core logic from output switching noise. |
| NC | No Connect | Unbonded balls (e.g., A1, B1, C1); must be left floating or grounded per PCB design rules. |
Key Features
| Feature | Design Value |
|---|---|
| Suspend/Resume Erase & Program | Enables reading or programming from any sector while erasing another - essential for real-time firmware update without system stall. |
| Secure Lock + Freeze | Permanently disables program/erase in up to eight 64KB regions; freeze prevents further lock changes - meets bootloader integrity requirements. |
| Top-Boot Block Configuration | Smallest 8 sectors (8KB each) reside at highest addresses (1F8000–1FFFFF) - ideal for protected boot code placement. |
| Common Flash Interface (CFI) | Standardized query table allows automatic detection of geometry, timing, and command sets by host BIOS or bootloader. |
| Individual Sector Write Lockout | Each sector can be independently locked/unlocked via software command - enables flexible firmware partitioning and field update safety. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Protection |
|---|---|
Use Scenario: Storing and updating ladder logic programs and configuration data in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level erase granularity and hardware-assisted write protection. Use Value: Enables safe field upgrades without risking corruption of running control logic; secure lock prevents unauthorized modification of safety-critical boot routines. | Use Scenario: Hosting certified bootloader and diagnostic firmware in Class II medical devices requiring FDA-compliant firmware integrity verification. IC Role / Device Role / Timing Role: Tamper-resistant boot memory with irreversible secure lock for regulatory audit trails. Use Value: Freeze-enabled secure regions ensure bootloader code remains unalterable post-certification - satisfying IEC 62304 traceability and change control requirements. |
| Telecom Base Station Configuration | Automotive Infotainment OTA Updates |
Use Scenario: Retaining radio calibration tables, network parameters, and fail-safe recovery images in remote telecom base station units. IC Role / Device Role / Timing Role: High-reliability configuration storage with suspend/resume capability for zero-downtime parameter updates. Use Value: 70 ns access time and 100,000-cycle endurance support frequent recalibration without wear-out; CFI simplifies integration into diverse carrier-grade platforms. | Use Scenario: Storing infotainment OS partitions and application modules updated via over-the-air (OTA) mechanisms in automotive head units. IC Role / Device Role / Timing Role: Field-upgradable firmware storage with top-boot architecture isolating boot code from application updates. Use Value: Top-boot layout ensures bootloader resides in highest-address sectors (SA63–SA70), protected by secure lock - preventing OTA corruption of boot sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| S29GL256P11TFI010 | 512 Mbit density, 90 ns access, 3.0–3.6 V, PLCC-56 package | Larger capacity but slower timing and through-hole packaging - unsuitable for high-speed or space-constrained designs | Select only if board layout accommodates PLCC and firmware image exceeds 32 Mbit. |
| MX29LV320ETTI-70G | 32 Mbit, 70 ns, 2.7–3.6 V, TSOP-48 package, bottom-boot configuration | Different boot block orientation and leaded package - requires PCB redesign and firmware address remapping | Choose only when TSOP-48 footprint is fixed and bottom-boot layout aligns with system memory map. |
Compared with S29GL256P11TFI010 and MX29LV320ETTI-70G, the AT49BV320ST-70CU offers unique top-boot CBGA packaging, secure lock/freeze functionality, and suspend/resume - making it optimal for compact, security-sensitive embedded systems where boot integrity and real-time update capability are mandatory.
Availability
AT49BV320ST-70CU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader protection, and telecom base station configuration requiring stable component supply across long product lifecycles.
Supply support for AT49BV320ST-70CU 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
Atmel Corporation (now part of Microchip Technology) designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT49BV320ST-70CU belongs to Atmel's BV-series Flash memory product line, engineered for in-system programmability, sector-level security, and robust operation in extended temperature industrial environments.
FAQ
What is the memory organization of the AT49BV320ST-70CU?
The AT49BV320ST-70CU is organized as 2,097,152 words of 16 bits each (32 Mbit total), with a top-boot sector layout: 63 sectors of 64KB (32K words) and 8 sectors of 8KB (4K words), where the 8KB sectors occupy the highest address range (1F8000–1FFFFF). This structure is confirmed in Section 4 of the AT49BV320S(T) Summary document.
Does the AT49BV320ST-70CU support Common Flash Interface (CFI)?
Yes, the AT49BV320ST-70CU supports the Common Flash Interface (CFI), enabling standardized auto-configuration of geometry, command sets, and timing parameters by host systems. This feature is explicitly listed in the Features section and verified in the device summary documentation.
What is the purpose of the VPP pin on the AT49BV320ST-70CU?
The VPP pin on the AT49BV320ST-70CU serves dual functions: it provides elevated voltage for accelerated program operations and acts as a hardware write-protection enable. When VPP is held at VCC, standard programming is allowed; when pulled low, write operations are inhibited - adding a layer of physical security beyond software locks.
How does the secure lock and freeze feature work on the AT49BV320ST-70CU?
The AT49BV320ST-70CU allows permanent locking of up to eight 64KB sectors using the secure lock command; once activated, those sectors cannot be erased or programmed via software or hardware. The freeze command then irreversibly prevents further secure lock activation - ensuring bootloader regions remain immutable after certification, as detailed in Sections 1 and 2 of the summary document.
Is the AT49BV320ST-70CU pin-compatible with the AT49BV320S variant?
No, the AT49BV320ST-70CU is not pin-compatible with the AT49BV320S variant due to differing sector address maps and boot configurations: the 'T' suffix denotes top-boot (8KB sectors at highest addresses), while the base 'S' version uses bottom-boot (8KB sectors at lowest addresses). Although both share the same CBGA-64 package and pinout, their memory mapping and secure region allocation differ fundamentally.
AT49BV320ST-70CU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-VBGA, CSPBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 2M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-CBGA (9x10)
AT49BV320ST-70CU FAQ
1.How can I place an order for AT49BV320ST-70CU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV320ST-70CU 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 AT49BV320ST-70CU reliable?
The price and inventory of AT49BV320ST-70CU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV320ST-70CU is usually 5 days.
3.What payment methods are accepted for AT49BV320ST-70CU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV320ST-70CU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV320ST-70CU?
AT49BV320ST-70CU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV320ST-70CU 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 AT49BV320ST-70CU?
For technical support, including AT49BV320ST-70CU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV320ST-70CU requirements.
6.How does Aetrix verify that AT49BV320ST-70CU is sourced from the original manufacturer or authorized distributors?
All AT49BV320ST-70CU 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 AT49BV320ST-70CU meets industry standards.
7.What is the process for return or replacement of AT49BV320ST-70CU?
All AT49BV320ST-70CU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV320ST-70CU, 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 AT49BV320ST-70CU part is unused and in its original packaging.
Return procedure for AT49BV320ST-70CU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV320ST-70CU Tags
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