My Inquiry
My Account
Microchip Technology AT49BV322DT-70CU-T
- Part No.:
- AT49BV322DT-70CU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-VFBGA, CSPBGA
- Datasheet:
-
AT49BV322DT-70CU-T.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49BV322DT-70CU-T from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC with 70 ns access time, sector erase architecture (63 × 64 KB + 8 × 8 KB), and suspend/resume capability for in-system programming. It operates from 2.65V to 3.6V, supports byte/word configuration via BYTE pin, and is used in embedded boot code storage, firmware update modules, and industrial controller nonvolatile data retention.
For engineers reviewing the AT49BV322DT-70CU-T datasheet, AT49BV322DT-70CU-T pinout, AT49BV322DT-70CU-T application, or AT49BV322DT-70CU-T equivalent, this page delivers verified technical context, real-world timing behavior, sector lockdown implementation details, CFI query support, and hardware-level write protection using VPP voltage sensing - all critical for secure, field-upgradable system design.
Technical Context
The AT49BV322DT-70CU-T implements a dual-mode x8/x16 interface controlled by the BYTE pin, with A0–A20 addressing and I/O0–I/O15 (x16) or I/O0–I/O7 (x8) data paths. Its command register executes six-byte sequences for chip/sector erase and lockdown, and supports Single Pulse Program mode after a six-byte entry sequence.
It integrates four status detection methods: READY/BUSY open-drain output, Data Polling on I/O7, Toggle Bit on I/O6, and dedicated status bits on I/O5 (erase/program failure) and I/O3 (VPP level). The device features a factory-programmed 64-bit block A and user-programmable/lockable 64-bit block B within its 128-bit protection register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 words × 16 bits or 4,194,304 bytes × 8 bits) |
| Access Time | 70 ns - determines maximum read throughput in high-speed microcontroller interfaces |
| Supply Voltage | 2.65V to 3.6V - enables direct connection to 3.3V logic without level shifters |
| Program Time | 10 µs per word - defines minimum write latency for firmware patching |
| Sector Erase Time | 100 ms per sector - sets firmware update window duration for individual code partitions |
| Erase Endurance | 100,000 cycles - guarantees long-term reliability in field-upgradeable systems |
| Standby Current | 15 µA - supports ultra-low-power sleep modes in battery-backed controllers |
Pinout & Package
AT49BV322DT-70CU-T is available in a 48-lead TSOP (Type 1) package, pin-compatible with industry-standard JEDEC MO-141AC. Pin functions are electrically identical in both TSOP and CBGA variants; this part uses the TSOP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word (x16) or 4M-byte (x8) addressing space |
| I/O0–I/O15 / I/O15(A−1) | Data I/O / LSB Address in Byte Mode | In x16 mode: bidirectional data path; in x8 mode: I/O0–I/O7 active, I/O15 repurposed as A−1 for byte-aligned addressing |
| BYTE | Interface Configuration Control | Logic high = x16 word mode; logic low = x8 byte mode - selects physical data bus width at power-on |
| CE, OE, WE | Chip/Output/Write Enable Controls | Three independent enables prevent bus contention; OE+CE low + WE high = read mode |
| VPP | Write Protection & Acceleration Input | Below 0.4V: disables program/erase; ≥1.65V: enables normal operation; 10.0V: enables accelerated dual-word programming |
| RDY/BUSY | Open-Drain Operation Status Output | Active-low signal indicating internal program/erase activity; supports wired-OR of multiple devices on shared bus |
| RESET | Hardware Initialization Input | Pulsed low ≥500 ns forces return to read/standby mode and clears pending suspend states |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Architecture | 71 independently lockable sectors (63 × 64 KB + 8 × 8 KB) enable granular firmware partitioning and secure boot code isolation |
| Erase/Program Suspend | Allows real-time interruption of erase/program operations to service high-priority reads from other sectors - essential for deterministic response in RTOS environments |
| Common Flash Interface (CFI) | Standardized query table accessible via 98h command at address 55h enables automatic driver initialization and multi-vendor flash abstraction layers |
| 128-bit Protection Register | Factory-block A (64-bit unique ID) + user-block B (programmable/lockable) provides cryptographic key storage and anti-cloning capability |
| Hardware Data Protection | VCC sense (<1.8V inhibits programming), 10 ms power-on delay, and VPP voltage monitoring prevent accidental writes during brown-out or power ramp conditions |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader Memory |
|---|---|
Use Scenario: Storing certified control logic and safety-critical boot firmware in programmable logic controllers subject to periodic field updates. IC Role / Device Role / Timing Role: Nonvolatile boot memory with sector lockdown protecting primary bootloader while allowing application code updates. Use Value: Prevents corruption of certified startup code during over-the-air updates; 100,000 erase cycles ensure >10-year field life under quarterly firmware revision schedules. | Use Scenario: Holding validated bootloader and calibration data in engine control units requiring ISO 26262-compliant update mechanisms. IC Role / Device Role / Timing Role: Secure, electrically erasable storage for ASIL-B boot code with hardware-enforced write protection via VPP and sector lockdown. Use Value: Enables safe dual-bank firmware switching: one locked sector holds immutable bootloader, second sector stores updatable application - verified by CFI and protection register checksums. |
| Medical Device Configuration Storage | Networking Equipment Image Repository |
Use Scenario: Retaining device-specific calibration parameters and regulatory-compliant operational profiles in diagnostic imaging systems. IC Role / Device Role / Timing Role: Tamper-resistant parameter store with 128-bit protection register used to bind calibration data to hardware serial identity. Use Value: Factory-programmed block A provides unchangeable device fingerprint; user-block B stores encrypted calibration keys - lockable post-configuration to meet IEC 62304 traceability requirements. | Use Scenario: Hosting multiple firmware images (primary, backup, recovery) in enterprise switches and routers requiring zero-downtime upgrades. IC Role / Device Role / Timing Role: High-reliability image repository supporting suspend/resume during concurrent read/write - enabling background image validation while serving live traffic. Use Value: 70 ns access time ensures fast boot from secondary image after failover; sector erase architecture allows atomic image swap without interrupting packet forwarding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201C-70-4C-EKE | Same density (32 Mbit), 70 ns access, but uses SST's SuperFlash technology with faster 18 µs program time and no VPP pin - relies on internal charge pump | Lacks VPP-based hardware write protection and sector lockdown; requires software-only security model | Select when lower program power and simplified supply (no VPP rail) are prioritized over hardware-enforced sector locking |
| MX29LV320ETTI-70G | 32 Mbit, 70 ns, supports CFI and sector erase, but only 10,000 erase cycles and no suspend/resume feature | No erase/program suspend capability limits use in real-time systems requiring deterministic latency | Choose for cost-sensitive consumer applications where firmware update concurrency is not required |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322DT-70CU-T uniquely combines hardware VPP write protection, 100,000-cycle endurance, and true suspend/resume - making it the only option among the three qualified for safety-critical, field-upgradable embedded systems requiring guaranteed sector-level integrity.
Availability
AT49BV322DT-70CU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU bootloader memory, medical device configuration storage, and networking equipment image repositories requiring stable component supply across extended product lifecycles.
Supply support for AT49BV322DT-70CU-T 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 AT49BV322D(T) family. The company specializes in secure, reliable microcontrollers and nonvolatile memory for industrial and automotive applications.
The AT49BV322D(T) belongs to Atmel's parallel-interface Flash memory product line, designed specifically for in-system programmable boot code storage in resource-constrained embedded systems requiring hardware-level data protection and field upgrade capability.
FAQ
What is the function of the VPP pin on the AT49BV322DT-70CU-T?
The VPP pin on the AT49BV322DT-70CU-T serves dual purposes: hardware write protection and accelerated programming. When VPP < 0.4V, all program and erase functions are inhibited. At ≥1.65V, standard operations proceed; at 10.0V, the Dual-word Program command enables faster parallel word programming. The pin must never be left floating and requires stable voltage regulation per the datasheet's absolute maximum rating of +9.5V.
How does sector lockdown work in the AT49BV322DT-70CU-T?
Sector lockdown in the AT49BV322DT-70CU-T is enabled per-sector via a six-bus-cycle command. Once activated, a locked sector becomes permanently read-only until the next power cycle or RESET pulse - preventing accidental or malicious erasure of boot code. Lockdown status is verified by reading address 00002H within the sector: I/O0 = high indicates lockdown active. This feature is optional and applied only to designated sectors, preserving flexibility for partial firmware updates.
Can the AT49BV322DT-70CU-T operate in both x8 and x16 modes?
Yes, the AT49BV322DT-70CU-T supports configurable x8 or x16 data interface via the BYTE pin. With BYTE = high, I/O0–I/O15 are active for 16-bit transfers; with BYTE = low, only I/O0–I/O7 are driven, and I/O15 functions as A−1 (LSB address input) for byte-aligned addressing. This dual-mode capability allows seamless integration with 8-bit and 16-bit microcontrollers without external glue logic.
What methods does the AT49BV322DT-70CU-T provide to detect end-of-erase or end-of-program?
The AT49BV322DT-70CU-T offers four independent detection methods: (1) RDY/BUSY pin (open-drain active-low), (2) Data Polling on I/O7 (complement-to-data then true data), (3) Toggle Bit on I/O6 (toggling stops at completion), and (4) status bits on I/O5 (failure flag) and I/O3 (VPP level). These may be used individually or in combination per the algorithms in Figures 4-1 through 4-4 of the datasheet to ensure robust operation under varying system timing constraints.
Is the AT49BV322DT-70CU-T compatible with Common Flash Interface (CFI) hosts?
Yes, the AT49BV322DT-70CU-T fully supports CFI. Entering CFI Query mode requires writing 98h to address 55h, after which standardized parameter tables (device geometry, timings, command sets) are readable at defined offsets. This enables automatic driver initialization in Linux MTD and U-Boot environments, simplifies second-source qualification, and supports runtime flash topology discovery without hard-coded assumptions.
AT49BV322DT-70CU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- 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:
- 120µs
- 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:
- 48-CBGA (6x8)
AT49BV322DT-70CU-T FAQ
1.How can I place an order for AT49BV322DT-70CU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322DT-70CU-T 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 AT49BV322DT-70CU-T reliable?
The price and inventory of AT49BV322DT-70CU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV322DT-70CU-T is usually 5 days.
3.What payment methods are accepted for AT49BV322DT-70CU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322DT-70CU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322DT-70CU-T?
AT49BV322DT-70CU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322DT-70CU-T 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 AT49BV322DT-70CU-T?
For technical support, including AT49BV322DT-70CU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322DT-70CU-T requirements.
6.How does Aetrix verify that AT49BV322DT-70CU-T is sourced from the original manufacturer or authorized distributors?
All AT49BV322DT-70CU-T 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 AT49BV322DT-70CU-T meets industry standards.
7.What is the process for return or replacement of AT49BV322DT-70CU-T?
All AT49BV322DT-70CU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322DT-70CU-T, 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 AT49BV322DT-70CU-T part is unused and in its original packaging.
Return procedure for AT49BV322DT-70CU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV322DT-70CU-T 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…
