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Microchip Technology AT49BV002T-90VC
- Part No.:
- AT49BV002T-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV002T-90VC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,710
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Product details
Overview
AT49BV002T-90VC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply Flash memory IC designed for in-system reprogrammability in embedded control and firmware storage applications. It operates from 2.7V to 3.6V, delivers 90 ns read access time, supports sector-erase architecture with a 16 KB boot block (address range 3C000H–3FFFFH), and guarantees ≥10,000 write/erase cycles.
For engineers reviewing the AT49BV002T-90VC datasheet, AT49BV002T-90VC pinout, AT49BV002T-90VC application, or AT49BV002T-90VC equivalent, key selection criteria include boot-block lockout capability, VSOP-32 (8 × 14 mm) package compatibility, DC-level RESET override for boot reprogramming, DATA polling/Toggle Bit status detection, and industrial temperature support (−40°C to +85°C).
Technical Context
This device implements a standard parallel interface with CE/OE/WE control logic, enabling EPROM-like read operation and command-based programming/erasure. Its internal state machine executes software-controlled chip erase (6-byte sequence), sector erase (targeting Parameter Blocks at 3A000H–3BFFFH and 38000H–39FFFH, or Main Memory Blocks), and byte programming with automatic pulse generation.
The boot block (3C000H–3FFFFH) features programmable lockout via a six-cycle command sequence; once enabled, it remains protected under ≤5.5 V, but can be overridden using 12 V ± 0.5 V applied to RESET during erase/program operations - a capability absent in N-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - directly maps to 8-bit microcontroller data bus without glue logic. |
| Read Access Time | 90 ns max - enables direct interfacing with 10 MHz bus systems without wait states. |
| Supply Voltage | 2.7 V to 3.6 V - compatible with 3.3 V logic rails and battery-backed operation down to 2.7 V. |
| Boot Block Size & Address | 16 KB (3C000H–3FFFFH) - isolates secure boot code from field-updatable application firmware. |
| Erase Time | 10 seconds typical for full chip erase - deterministic timing simplifies host firmware timeout handling. |
| Byte Programming Time | 30 µs typical - supports incremental firmware patching without system interruption. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay loops in host driver code. |
Pinout & Package
AT49BV002T-90VC is packaged in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body size, with standard JEDEC-compliant lead pitch and coplanarity. Pin 1 is located at the bottom-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte selection within 8-bit data width. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and ARM7 legacy bus protocols; high-impedance during standby/read disable. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in multi-device systems. |
| OE | Output Enable | Active-low output gate; allows shared data bus usage by enabling outputs only during active read cycles. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing - critical for reliable command sequence execution. |
| RESET | Hardware Reset / Boot Override | Logic-high enables normal operation; 12 V ± 0.5 V input overrides boot block lockout - unique to T-suffix devices and essential for secure recovery paths. |
| VCC | Power Supply | 2.7–3.6 V supply; internal voltage regulation ensures stable core operation across full voltage range. |
| GND | Ground Reference | Signal and power ground return; decoupling capacitor placement near this pin minimizes noise-induced program corruption. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | Enables permanent protection of 16 KB boot code (3C000H–3FFFFH); prevents accidental overwrite while allowing runtime updates to application sectors. |
| DC-Level RESET Override | Applying 12 V ± 0.5 V to RESET pin permits reprogramming of locked boot block - provides hardware-fallback recovery without requiring external high-voltage programmers. |
| Sector-Erase Architecture | Independent erasure of two 8 KB parameter blocks (3A000H–3BFFFH, 38000H–39FFFH) and two main memory blocks - enables modular firmware updates without full chip erase. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) - reduces risk of spurious writes in noisy environments. |
| CMOS Standby Current | 50 µA typical - enables low-power retention in battery-operated systems during firmware idle periods. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing bootloader and safety-critical initialization routines in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with hardware-enforced boot integrity and field-upgradable application partitions. Use Value: Boot block lockout prevents corruption of certified startup code; sector erase allows versioned firmware updates without disrupting operational safety logic. |
Use Scenario: Securing boot firmware in portable diagnostic equipment where regulatory compliance requires immutable startup validation. IC Role / Device Role / Timing Role: Trusted boot memory with 12 V RESET override enabling authorized service-mode reprogramming. Use Value: Ensures FDA/IEC 62304 compliance by guaranteeing boot code persistence; VSOP package supports compact, thermally constrained PCB layouts. |
| Automotive Infotainment System Updates | Legacy Embedded Controller Upgrade Path |
Use Scenario: Hosting updatable UI assets and configuration tables in vehicle head units operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Temperature-rated Flash memory with fast 90 ns reads for responsive GUI rendering and robust erase/write endurance. Use Value: Industrial-grade temperature support and 10,000-cycle endurance ensure reliability over 10+ year vehicle lifetimes; DATA polling simplifies update driver development. |
Use Scenario: Replacing obsolete EPROMs in legacy industrial controllers using existing 8-bit parallel bus infrastructure. IC Role / Device Role / Timing Role: Drop-in EPROM-compatible Flash with identical pinout, timing, and command-set behavior. Use Value: Eliminates UV-eraser dependency and socket wear; retains same PCB layout and firmware HAL layer with minimal driver changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF200A-90-4C-NHE | 4 Mbit density (512K × 8), 90 ns access, 3.0–3.6 V supply; lacks 12 V RESET override and boot block lockout override capability. | Higher capacity suits larger firmware images but requires modified address decoding; no hardware fallback for locked boot sectors. | Select when >2 Mbit capacity is required and boot recovery is handled via external controller logic. |
| MX29LV200CTTI-90G | 2 Mbit, 90 ns, 2.7–3.6 V; includes CFI-compliant command set and 16 KB boot sector, but uses different lockout mechanism (write-protect pins vs. command sequence) and no 12 V override. | CFI support simplifies auto-detection in generic flash programmers; boot protection relies on hardware pins rather than software commands. | Select for standardized CFI-based toolchains where pin-strapped protection is preferred over command-based flexibility. |
Compared with SST39VF200A-90-4C-NHE and MX29LV200CTTI-90G, the AT49BV002T-90VC uniquely combines command-based boot lockout with 12 V RESET override - enabling both secure default operation and authorized field recovery without external HV circuitry or layout changes.
Availability
AT49BV002T-90VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, automotive infotainment system updates, and legacy embedded controller upgrade paths requiring stable component supply across extended product lifecycles.
Supply support for AT49BV002T-90VC 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 technical and manufacturing continuity for the AT49BV/LV series. The company specializes in microcontrollers, analog, Flash memory, and security ICs for industrial, automotive, and IoT markets.
The AT49BV002T-90VC belongs to Atmel's Battery-Voltage™ Flash family, engineered specifically for reliable in-system reprogramming in space-constrained, low-voltage embedded systems where firmware integrity and field-upgradability are critical design requirements.
FAQ
What is the function of the RESET pin on the AT49BV002T-90VC beyond system reset?
The RESET pin on the AT49BV002T-90VC serves a dual role: standard logic-level reset (VIH/VIL) and hardware override for boot block protection. When 12 V ± 0.5 V is applied during erase or program operations, it temporarily disables the boot block lockout feature - a capability exclusive to T-suffix variants and absent in N-suffix parts. This allows authorized reprogramming of secured boot code without external high-voltage programmers, making AT49BV002T-90VC suitable for safety-critical field recovery scenarios.
How does the AT49BV002T-90VC differ from the AT49BV002N-90VC in terms of boot block protection?
The AT49BV002T-90VC implements a command-enabled boot block lockout that can be overridden using 12 V on the RESET pin, whereas the AT49BV002N-90VC lacks RESET pin functionality entirely for boot override. In the N-suffix variant, once boot lockout is enabled, the 16 KB boot block (00000H–03FFFH) becomes permanently immutable under all voltage conditions. The T-suffix version places the boot block at 3C000H–3FFFFH and retains recoverability - a key distinction for designs requiring secure yet serviceable firmware architectures.
Can the AT49BV002T-90VC be used as a direct replacement for standard EPROMs like the 27C256?
Yes, the AT49BV002T-90VC is pin-compatible and timing-compatible with 27C256 EPROMs in read mode (CE/OE/WE control, same 32-pin VSOP footprint), enabling drop-in replacement in legacy 8-bit systems. However, unlike EPROMs, it requires no UV erasure and supports in-circuit reprogramming via standard 3.3 V logic levels and documented command sequences. Its 90 ns access time matches common EPROM speeds, and the VSOP-32 package ensures mechanical interchangeability without PCB redesign.
What are the valid sector erase address ranges for the AT49BV002T-90VC?
The AT49BV002T-90VC supports sector erase targeting four distinct regions: Parameter Block 1 (3A000H–3BFFFH), Parameter Block 2 (38000H–39FFFH), Main Memory Block 1 (20000H–37FFFH), and Main Memory Block 2 (00000H–1FFFFH). Each sector is erased independently using a six-cycle command sequence with the sector address latched on the sixth WE falling edge. The boot block (3C000H–3FFFFH) cannot be erased via sector command - only full chip erase affects it if lockout is disabled.
Does the AT49BV002T-90VC support both DATA polling and Toggle Bit for operation completion detection?
Yes, the AT49BV002T-90VC supports both DATA polling (monitoring I/O7 for complemented data during programming) and Toggle Bit (observing I/O6 toggling during program/erase cycles) to detect end-of-operation. These methods eliminate reliance on fixed timing delays in host firmware. DATA polling returns true data on I/O7 once complete; Toggle Bit ceases toggling and stabilizes to valid data. Both are characterized and usable concurrently - providing redundancy and flexibility for real-time embedded drivers.
AT49BV002T-90VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV002T-90VC FAQ
1.How can I place an order for AT49BV002T-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002T-90VC 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 AT49BV002T-90VC reliable?
The price and inventory of AT49BV002T-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002T-90VC is usually 5 days.
3.What payment methods are accepted for AT49BV002T-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002T-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002T-90VC?
AT49BV002T-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002T-90VC 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 AT49BV002T-90VC?
For technical support, including AT49BV002T-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002T-90VC requirements.
6.How does Aetrix verify that AT49BV002T-90VC is sourced from the original manufacturer or authorized distributors?
All AT49BV002T-90VC 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 AT49BV002T-90VC meets industry standards.
7.What is the process for return or replacement of AT49BV002T-90VC?
All AT49BV002T-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002T-90VC, 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 AT49BV002T-90VC part is unused and in its original packaging.
Return procedure for AT49BV002T-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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