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Microchip Technology AT49BV040-12TC
- Part No.:
- AT49BV040-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV040-12TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
AT49BV040-12TC from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating at 2.7V–3.6V, featuring 120 ns read access time, 10-second chip erase, and 30 µs/byte programming. It integrates a 16 KB boot block with programmable lockout and hardware data protection for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49BV040-12TC datasheet, AT49BV040-12TC pinout, AT49BV040-12TC application, or AT49BV040-12TC equivalent, this device serves as a drop-in replacement for legacy 3V-only parallel Flash in boot code storage, BIOS/UEFI firmware, and industrial controller firmware updates where low-voltage operation and sector-level write protection are required.
Technical Context
The AT49BV040-12TC implements a parallel asynchronous interface with CE/OE/WE control logic enabling EPROM-like read access and software-controlled byte programming. Its internal command register interprets six-byte sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) to initiate chip erase or boot block lockout.
It supports two distinct operational modes: standard read/program via address/data bus timing, and software product identification mode (via 5555h/AAh → 2AAAh/55h → 5555h/90h) to retrieve manufacturer code 1Fh and device code 13h. Data polling (I/O7 complement) and toggle bit (I/O6 toggling) provide real-time program/erase completion detection without external clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), sufficient for full boot loader + configuration data in space-constrained designs |
| Read Access Time | 120 ns maximum - defines minimum CPU wait-state requirement for 8-bit parallel bus interfacing |
| Byte Programming Time | 30 µs typical - enables rapid field firmware patching without system downtime |
| Chip Erase Time | 10 seconds maximum - allows full memory reset during manufacturing or recovery procedures |
| Boot Block Size | 16 KB (00000h–03FFFh) - isolates critical startup code from accidental overwrite during main array updates |
| Supply Voltage Range | 2.7V–3.6V - compatible with single-cell Li-ion or regulated 3.3V rails, eliminating need for voltage translators |
| Standby Current | 50 µA CMOS - enables ultra-low-power retention in battery-backed systems |
| Endurance | 10,000 program/erase cycles - supports frequent firmware updates over product lifetime |
Pinout & Package
AT49BV040-12TC is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP), 8 mm × 14 mm footprint (JEDEC MO-142 BA, package code 32V), suitable for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0 least significant bit |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification operations |
| CE | Chip Enable | Active-low chip select; must be low for any memory access; controls power state transition |
| OE | Output Enable | Active-low output gate; disables I/O drivers during bus sharing to prevent contention |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge for program/erase commands |
| VCC | Power Supply | 2.7V–3.6V core supply; powers internal logic, charge pumps, and I/O buffers |
| GND | Ground Reference | Signal and power return path; decoupling capacitor placement critical for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7V–3.6V Supply Operation | Eliminates need for dual-voltage regulators or charge pumps, reducing BOM cost and board area |
| Hardware Data Protection | VCC sense (<1.8V inhibits programming), WE/CE/OE logic gating, and 15 ns noise filtering prevent spurious writes |
| Data Polling & Toggle Bit Detection | Enables interrupt-driven firmware update routines without fixed delay loops or external timers |
| Boot Block Lockout | Software-activated permanent write protection for 16 KB region (00000h–03FFFh), securing boot code integrity |
| Software Product Identification | Read-only manufacturer code (1Fh) and device code (13h) accessible via standard bus commands for auto-detection |
Applications
| Industrial PLC Firmware Storage | Embedded Boot Loader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature ranges. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct CPU bus access for cold-boot execution and field-upgradable firmware. Use Value: 10,000-cycle endurance and -40°C to +85°C industrial temperature rating ensure reliable operation across decades of maintenance cycles. | Use Scenario: Hosting boot code for ARM Cortex-M or RISC-V microcontrollers in medical diagnostic equipment requiring secure startup sequence. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector address, with boot block lockout preventing corruption of initialization routines. Use Value: 16 KB protected boot sector guarantees that critical startup instructions remain unaltered during main application updates. |
| Point-of-Sale Terminal BIOS | Network Router Configuration Storage |
Use Scenario: Storing BIOS and hardware initialization code in retail payment terminals subject to frequent power cycling and environmental stress. IC Role / Device Role / Timing Role: Parallel-interface Flash memory accessed during power-on self-test (POST) before DRAM initialization. Use Value: 120 ns read access time meets tight timing budgets for early-boot execution without wait states on 8-bit microcontroller buses. | Use Scenario: Retaining routing tables, security certificates, and firmware patches in enterprise-grade Ethernet switches with remote management capability. IC Role / Device Role / Timing Role: Firmware update target memory supporting in-system reprogramming via JTAG or serial interface bridge. Use Value: Software-controlled chip erase and byte programming enable zero-downtime firmware upgrades without physical device replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-70-4C-NHE | 4 Mbit, 70 ns access, 3.0V–3.6V supply, same 32-pin TSOP package but no boot block lockout feature | Lacks hardware-enforced 16 KB write protection; requires external software safeguards for boot code integrity | Select when faster read speed is prioritized over boot sector security and system-level write-lock enforcement is handled in firmware |
| MX29LV040CTC-70G | 4 Mbit, 70 ns access, 2.7V–3.6V supply, includes boot block but uses different command set (AMD-style vs Atmel's proprietary) | Requires redesign of firmware update routines due to incompatible erase/write command sequences and status polling method | Select when migrating from AMD-compatible platforms and existing driver code can be adapted to new command protocol |
Compared with SST39VF040-70-4C-NHE and MX29LV040CTC-70G, the AT49BV040-12TC provides deterministic boot block lockout activation via documented six-byte sequence and guaranteed 120 ns timing margin for slower microcontrollers, making it preferable for safety-critical boot memory where hardware-enforced write protection is mandatory.
Availability
AT49BV040-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded boot loader memory, and network router configuration storage requiring stable component supply across extended product lifecycles.
Supply support for AT49BV040-12TC 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, is a semiconductor designer specializing in microcontrollers, nonvolatile memory, and secure authentication devices.
The AT49BV/LV040 product line was engineered for embedded systems requiring reliable, low-voltage parallel Flash memory with integrated boot code protection and in-system reprogrammability.
FAQ
What is the operating temperature range for the AT49BV040-12TC?
The AT49BV040-12TC is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table on page 5 of the datasheet, where AT49BV040-12 variants are explicitly listed under the Industrial column. The device maintains full functionality-including 120 ns read access, 30 µs byte programming, and 10-second chip erase-across this entire range without derating.
Does the AT49BV040-12TC support hardware write protection independent of software commands?
Yes, the AT49BV040-12TC implements three layers of hardware data protection: (1) VCC sense circuitry that inhibits programming if supply drops below 1.8V, (2) automatic program inhibition when OE is low or CE is high or WE is high, and (3) a 15 ns noise filter on WE and CE inputs. These features operate autonomously without firmware intervention and are detailed in the "Hardware Data Protection" section on page 3 of the datasheet.
How is the boot block lockout feature activated on the AT49BV040-12TC?
The boot block lockout feature on the AT49BV040-12TC is activated by executing a precise six-byte command sequence: load AAh to address 5555h, 55h to 2AAAh, 80h to 5555h, AAh to 5555h, 55h to 2AAAh, then 40h to 5555h. This sequence is documented in the "Boot Block Lockout Feature Enable Algorithm" on page 10. Once executed, the lockout is permanent and irreversible.
Can the AT49BV040-12TC be used with 5V-tolerant microcontrollers?
Yes, the AT49BV040-12TC accepts input voltages up to 5.5V on address and control pins (A0–A18, CE, OE, WE) while powered from 2.7V–3.6V, as specified in the "Input Levels" section on page 4. However, I/O lines are limited to 0–VCC+0.6V, so direct connection to 5V logic outputs requires level translation to avoid damage or data corruption.
What packaging options are available for the AT49BV040-12TC?
The AT49BV040-12TC is supplied exclusively in the 32-lead Plastic Thin Small Outline Package (TSOP) with 8 mm × 14 mm dimensions (JEDEC MO-142 BA, package code 32V). This is confirmed in the "Ordering Information" table on page 11 and "Packaging Information" on page 12, where "AT49BV040-12TC" maps directly to "32T" (8×20 mm) and "32V" (8×14 mm); the "TC" suffix denotes the 32V variant per Atmel's ordering convention.
AT49BV040-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49BV040-12TC FAQ
1.How can I place an order for AT49BV040-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040-12TC 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 AT49BV040-12TC reliable?
The price and inventory of AT49BV040-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040-12TC is usually 5 days.
3.What payment methods are accepted for AT49BV040-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040-12TC?
AT49BV040-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040-12TC 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 AT49BV040-12TC?
For technical support, including AT49BV040-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040-12TC requirements.
6.How does Aetrix verify that AT49BV040-12TC is sourced from the original manufacturer or authorized distributors?
All AT49BV040-12TC 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 AT49BV040-12TC meets industry standards.
7.What is the process for return or replacement of AT49BV040-12TC?
All AT49BV040-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040-12TC, 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 AT49BV040-12TC part is unused and in its original packaging.
Return procedure for AT49BV040-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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