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Microchip Technology AT49BV512-90JC
- Part No.:
- AT49BV512-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV512-90JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
AT49BV512-90JC from Atmel is a 512 Kbit (64K × 8) single-supply 3V-only Flash memory IC with 90 ns read access time, 8K-byte boot block featuring programmable lockout, and hardware data protection. It operates across 0°C to 70°C, supports byte-by-byte programming (30 µs/byte), and is used in embedded firmware storage for industrial controllers and legacy microcontroller systems.
For engineers reviewing the AT49BV512-90JC datasheet, AT49BV512-90JC pinout, AT49BV512-90JC application, or AT49BV512-90JC equivalent, key selection considerations include boot-sector write protection, 2.7–3.6 V operation without high-voltage programming, DATA polling/Toggle Bit erase-program status detection, and compatibility with EPROM-style read interfaces in space-constrained designs.
Technical Context
The AT49BV512-90JC implements a parallel interface Flash architecture with dual-line chip enable (CE) and output enable (OE) control to prevent bus contention during read cycles. Its internal command register executes software-controlled operations-including chip erase (6-byte sequence), byte programming (4-bus-cycle), and boot block lockout-without external high-voltage circuitry.
It features two distinct memory regions: a 56K-byte main array and an optional 8K-byte boot block (0000H–1FFFH) with permanent write lockout once enabled. Erased bits default to logical "1", and only erase cycles convert "0" back to "1"; programming is strictly one-time per bit until erased.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8), enabling firmware storage for 8-bit microcontrollers with limited address space |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz bus interfaces in legacy industrial systems |
| Supply Voltage | 2.7 V to 3.6 V - supports direct battery or low-dropout regulator operation without level-shifting |
| Byte Programming Time | 30 µs typical - enables rapid field updates of small code patches without system downtime |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware |
| Boot Block Size | 8K bytes (0000H–1FFFH) - isolates secure boot code from application updates to prevent corruption |
| Write Endurance | 10,000 program/erase cycles - suitable for infrequent firmware upgrades over 10+ year product lifecycles |
Pinout & Package
AT49BV512-90JC is packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC), measuring 12.5 mm × 12.5 mm × 3.5 mm (JEDEC MS-016 AE), with gull-wing leads and pin 1 identifier marked by a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; A0–A12 select byte within 8K boot block |
| CE | Chip Enable | Active-low global enable; must be low for read/write; high forces outputs to high-Z state |
| OE | Output Enable | Active-low read control; used with CE to gate output drivers and avoid bus contention |
| WE | Write Enable | Active-low programming/erase control; latches address/data on falling/rising edges per AC timing |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries DIN during programming, DOUT during read, and status bits (I/O6/I/O7) for polling |
| VCC | Power Supply | 2.7–3.6 V single supply; powers core logic and I/O buffers; includes VCC sense for program inhibit |
| GND | Ground Reference | Common return path for all signals; decoupling capacitor required near VCC pin |
| NC | No Connect | Unbonded pins (positions 6, 7, 10, 11, 25, 26); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Single 3V-only operation | Eliminates need for 5V/12V programming supplies - simplifies power architecture and PCB layout |
| Hardware data protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line gating prevent accidental writes |
| Boot block lockout | Software-enabled permanent write protection for 8K-byte region - ensures bootloader integrity during field updates |
| CMOS standby current | 50 µA max - enables ultra-low-power retention in battery-backed systems during sleep modes |
| Erase cycle time | 10 seconds typical for full-chip erase - predictable duration allows deterministic host firmware scheduling |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Bootloader |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage device providing EPROM-compatible read interface and in-system reprogrammability via standard microcontroller GPIOs. Use Value: 8K boot block lockout prevents accidental overwrite of critical startup routines during remote firmware updates, ensuring system reliability across 10,000+ field cycles. |
Use Scenario: Hosting boot code for 8-bit MCUs (e.g., 8051 derivatives) in medical diagnostic instruments requiring certified, immutable startup sequences. IC Role / Device Role / Timing Role: Primary firmware memory with deterministic 90 ns read latency and hardware write protection to meet IEC 62304 safety requirements. Use Value: Single 3V supply and DATA polling eliminate external voltage translators and polling delays - reducing BOM count and validation effort for Class II devices. |
| Point-of-Sale Terminal Configuration | Telecom Line Card Code Storage |
Use Scenario: Holding localized language packs and tax rule databases in retail POS terminals subject to frequent regional software revisions. IC Role / Device Role / Timing Role: Field-upgradable flash memory accessed via parallel bus; leverages byte programming for incremental patch deployment. Use Value: 30 µs/byte programming enables sub-second update of localized strings without interrupting transaction processing - improving service uptime. |
Use Scenario: Storing DSP firmware and calibration tables in carrier-grade DSLAM line cards operating continuously in telecom central offices. IC Role / Device Role / Timing Role: High-reliability nonvolatile memory with 50 µA standby current and industrial temperature rating (-40°C to +85°C variants available). Use Value: 10,000 write cycles and hardware data protection ensure >15-year field life with zero uncorrectable bit errors under constant thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF512 | Same density (512 Kbit), 3.3 V operation, but 70 ns access time and no boot block lockout feature | Lacks hardware-protected boot sector; requires external logic or firmware checks for bootloader safety | Select when faster read speed is prioritized over boot code integrity guarantees |
| MX29LV512 | 512 Kbit, 3.0 V core, 90 ns access, but uses different command set and has 16K boot block (not 8K) | Boot block occupies 0000H–3FFFH; incompatible lockout algorithm prevents drop-in replacement | Choose only if redesigning boot partition layout and validating new command sequences |
Compared with SST39VF512 and MX29LV512, the AT49BV512-90JC uniquely delivers verified 8K boot block lockout with Atmel's standardized 6-byte enable sequence, making it the sole option among these three for systems requiring certified bootloader immutability without external supervision.
Availability
AT49BV512-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller bootloader implementation, and point-of-sale terminal configuration requiring stable component supply and long-term obsolescence management.
Supply support for AT49BV512-90JC 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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial and automotive markets.
The AT49BV512-90JC belongs to Atmel's Battery-Voltage™ Flash memory family, designed specifically for low-voltage, in-system programmable code storage in resource-constrained embedded systems where reliability and simplicity outweigh raw speed.
FAQ
What is the operating temperature range for the AT49BV512-90JC?
The AT49BV512-90JC is rated for commercial operation from 0°C to +70°C. Industrial-grade variants (e.g., AT49BV512-90JI) extend this to −40°C to +85°C, but the -90JC suffix explicitly denotes the commercial temperature grade. This range is validated per JEDEC JESD22-A108 and applies to all DC and AC parameters in the datasheet.
Does the AT49BV512-90JC require high-voltage programming signals?
No, the AT49BV512-90JC operates exclusively from a single 2.7–3.6 V supply for both read and write operations. Programming and erase commands are executed via standard 3V-level bus cycles - no external 5V, 12V, or VPP signals are needed. This eliminates high-voltage generator circuitry and simplifies system design.
How is boot block protection enabled on the AT49BV512-90JC?
Boot block lockout on the AT49BV512-90JC is enabled by issuing a precise six-byte software command sequence: load 0xAA to address 0x5555, 0x55 to 0x2AAA, 0x80 to 0x5555, then 0xAA, 0x55, and 0x40 to 0x5555. Once executed, the 8K boot block (0000H–1FFFH) becomes permanently unwritable and unerasable - a hardware-enforced state.
Can the AT49BV512-90JC be used as a direct replacement for standard EPROMs?
Yes, the AT49BV512-90JC supports EPROM-compatible read mode: with CE and OE low and WE high, it drives valid data onto I/O0–I/O7 within 90 ns. However, unlike EPROMs, it requires no UV erasure and supports in-circuit reprogramming - making it a functional and pin-compatible upgrade path for sockets originally designed for 27C512 EPROMs.
What methods does the AT49BV512-90JC provide to detect completion of programming or erase cycles?
The AT49BV512-90JC offers two hardware-supported status detection methods: DATA polling (reading the programmed byte returns its complement on I/O7 until complete) and Toggle Bit (I/O6 toggles between 0 and 1 during operation and stabilizes upon completion). Both allow host firmware to poll asynchronously without fixed timing delays.
AT49BV512-90JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 30µs
- 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-PLCC (13.97x11.43)
AT49BV512-90JC FAQ
1.How can I place an order for AT49BV512-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV512-90JC 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 AT49BV512-90JC reliable?
The price and inventory of AT49BV512-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV512-90JC is usually 5 days.
3.What payment methods are accepted for AT49BV512-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV512-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV512-90JC?
AT49BV512-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV512-90JC 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 AT49BV512-90JC?
For technical support, including AT49BV512-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV512-90JC requirements.
6.How does Aetrix verify that AT49BV512-90JC is sourced from the original manufacturer or authorized distributors?
All AT49BV512-90JC 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 AT49BV512-90JC meets industry standards.
7.What is the process for return or replacement of AT49BV512-90JC?
All AT49BV512-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV512-90JC, 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 AT49BV512-90JC part is unused and in its original packaging.
Return procedure for AT49BV512-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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