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Microchip Technology AT49BV512-12JC
- Part No.:
- AT49BV512-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV512-12JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49BV512-12JC from Atmel is a 512 Kbit (64K × 8) single-supply 3V-only Flash memory with 120 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 system BIOS.
For engineers reviewing the AT49BV512-12JC datasheet, AT49BV512-12JC pinout, AT49BV512-12JC application, or AT49BV512-12JC equivalent, key selection considerations include its 2.7–3.6 V supply range, boot sector write protection, DATA polling and toggle-bit program/erase status detection, and PLCC-32 package compatibility with legacy socketed designs.
Technical Context
The AT49BV512-12JC implements a standard parallel Flash architecture with CE/OE/WE control logic enabling EPROM-like read access and command-based byte programming and chip erase. Its internal command register interprets six-byte software sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h → …) to initiate boot lockout, chip erase, or product identification.
It features dual status detection-DATA polling on I/O7 (complement-to-data during programming) and toggle-bit behavior on I/O6-allowing host systems to monitor operation completion without timers. Hardware protection includes VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line gating (OE low or CE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8), directly addressable via A0–A15; supports full 64K-word firmware images. |
| Read Access Time | 120 ns max - determines minimum bus cycle timing for 8-bit microcontroller interfaces. |
| Supply Voltage | 2.7 V to 3.6 V - enables direct connection to 3.3 V rails without level shifters or charge pumps. |
| Byte Programming Time | 30 µs typical - defines worst-case latency for field firmware patching or configuration updates. |
| Chip Erase Time | 10 seconds max - sets minimum downtime during full reprogramming; no external clocks required. |
| Boot Block Size | 8 Kbytes (0000h–1FFFh) - isolates critical startup code; lockout prevents accidental overwrite after enable. |
| Endurance | 10,000 write/erase cycles - specifies maximum field update count before wear-out risk increases. |
| Standby Current | 50 µA CMOS - enables low-power retention in battery-backed or always-on embedded systems. |
Pinout & Package
AT49BV512-12JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with JEDEC MS-016, Variation AE. The package measures 12.57 mm × 12.57 mm × 3.56 mm (max height) and uses gull-wing leads with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; fully decodes 64K locations; A0–A15 mapped per PLCC top-view pinout. |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-Z and enables standby mode. |
| OE | Output Enable | Active-low output gate; controls data bus drivers independently of CE; enables bus sharing. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; combined with CE/OE to define operation mode. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit multiplexed data path; carries input data during programming, output data during read, and status bits (I/O6/I/O7) during polling. |
| NC | No Connect | Pins 6, 7, 14, 15, 25, 26 - electrically isolated; must remain unconnected per datasheet. |
| VCC | Power Supply | 2.7–3.6 V main supply; powers core logic and I/O buffers; requires local 0.1 µF decoupling. |
| GND | Ground | Reference plane for all signals and power; pin 16 in PLCC; must be low-inductance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6 V supply for read/write | Eliminates need for 5 V or 12 V programming voltages - simplifies power design and enables in-system reprogramming. |
| Hardware data protection | Combines VCC sense, control-line gating, and noise filtering to prevent spurious writes - improves field reliability without software overhead. |
| Boot block lockout (8 KB) | Immutable firmware region (0000h–1FFFh) secured via 6-byte command sequence - preserves bootloader integrity during application updates. |
| DATA polling & toggle-bit status | I/O7 complement and I/O6 toggling provide real-time, asynchronous operation completion feedback - removes dependency on fixed timing delays. |
| CMOS standby current (50 µA) | Enables ultra-low-power retention in battery-powered or energy-harvesting devices - extends operational life between charges. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded BIOS |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory providing boot code and runtime logic; accessed via 8-bit parallel bus synchronized to microcontroller clock. Use Value: 120 ns access time ensures deterministic instruction fetch timing; boot block lockout prevents corruption of safety-critical startup routines during field updates. |
Use Scenario: Holding BIOS code and hardware initialization routines in legacy x86-based industrial computers where socketed Flash replacement is required. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical pinout and read protocol; supports in-circuit reprogramming without board removal. Use Value: PLCC-32 package matches standard ZIF sockets; 3V-only operation eliminates need for voltage translators when upgrading from 5V EPROMs. |
| Medical Device Bootloader | Telecom Line Card Configuration |
|
Use Scenario: Securing certified bootloader code in Class II medical equipment requiring traceable firmware revisions and tamper-resistant storage. IC Role / Device Role / Timing Role: Write-protected boot memory storing cryptographic keys and secure boot verification logic; accessed only at power-on reset. Use Value: Boot block lockout provides hardware-enforced immutability - satisfies IEC 62304 requirements for firmware integrity without software checksum enforcement. |
Use Scenario: Storing line-specific configuration parameters and DSP firmware in carrier-grade DSLAM or ONU line cards deployed in central offices. IC Role / Device Role / Timing Role: Field-upgradable configuration store; updated via serial management interface driving parallel Flash through microcontroller GPIO. Use Value: 10,000-cycle endurance supports lifetime field updates; DATA polling allows precise timing of firmware commits without CPU polling loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF512-70-4C-NHE | 512 Kbit, 70 ns access, 3.0–3.6 V, same PLCC-32 package; lacks boot block lockout and toggle-bit detection. | Requires external software lock management; suitable for non-critical firmware where full-chip erase suffices. | Select when faster read timing is prioritized over boot-sector protection and status feedback granularity. |
| MX29LV512CTTI-12G | 512 Kbit, 120 ns access, 2.7–3.6 V, TSOP-32 package; includes CFI-compliant command set but no dedicated boot block. | Requires PCB redesign for TSOP footprint; supports JEDEC-standard programming algorithms but no hardware lockout. | Choose for space-constrained designs accepting TSOP; verify compatibility with existing command parser before migration. |
Compared with SST39VF512-70-4C-NHE and MX29LV512CTTI-12G, the AT49BV512-12JC uniquely delivers hardware-enforced boot block protection and dual-status monitoring (DATA polling + toggle bit) in a legacy-compatible PLCC-32 package - critical for safety-aware or field-serviceable systems requiring guaranteed bootloader integrity and deterministic programming feedback.
Availability
AT49BV512-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded BIOS replacement, and medical device bootloader applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49BV512-12JC 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.
The AT49BV512-12JC belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for 3V-only embedded systems requiring reliable, socket-compatible nonvolatile storage with hardware-level data protection and in-system reprogrammability.
FAQ
What is the operating temperature range for the AT49BV512-12JC?
The AT49BV512-12JC is rated for commercial operation from 0°C to +70°C. Its datasheet specifies this range for all DC and AC parameters including 120 ns read access time, 30 µs byte programming, and 50 µA standby current. Industrial variants (e.g., AT49BV512-12JI) extend to −40°C to +85°C, but the -12JC suffix confirms the commercial grade. This makes the AT49BV512-12JC appropriate for controlled-environment applications like office equipment or non-ruggedized industrial controllers.
Does the AT49BV512-12JC require high-voltage programming signals?
No, the AT49BV512-12JC operates exclusively from a single 2.7–3.6 V supply for both read and write operations. It uses internally generated high-voltage pulses triggered by standard 3V command sequences (e.g., 5555h/AAh), eliminating external VPP pins or charge pumps. This design simplifies PCB layout and enables safe in-system programming - a core feature of the AT49BV512-12JC that distinguishes it from older 5V Flash or EPROM devices.
How is boot block protection enabled on the AT49BV512-12JC?
Boot block lockout on the AT49BV512-12JC is activated by issuing a precise six-byte command sequence: load AAh at 5555h, 55h at 2AAAh, 80h at 5555h, then AAh/55h/40h again at the same addresses. Once executed, the 8K-byte region (0000h–1FFFh) becomes permanently write- and erase-protected. The AT49BV512-12JC provides software detection of lockout status via I/O0 read at address 0002h - a hardware-enforced security feature not dependent on external controllers.
What package type does the AT49BV512-12JC use?
The AT49BV512-12JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016, Variation AE. Its dimensions are 12.57 mm × 12.57 mm × 3.56 mm (max height), with gull-wing leads on 1.27 mm pitch. This package is socket-compatible with legacy ZIF sockets used for EPROMs and earlier Flash devices, making the AT49BV512-12JC a direct physical and functional replacement in retrofitted systems.
Can the AT49BV512-12JC be used as a drop-in replacement for standard EPROMs?
Yes - the AT49BV512-12JC supports EPROM-compatible read operation: when CE and OE are low and WE is high, it asserts data on I/O0–I/O7 identically to a 27C512 EPROM. Its pinout matches standard 32-pin PLCC EPROMs (A0–A15, I/O0–I/O7, CE/OE/WE, VCC/GND), and its 120 ns access time meets or exceeds many 5V EPROMs. However, programming requires command sequences instead of UV erasure, so the AT49BV512-12JC replaces EPROMs functionally and physically but requires updated programming firmware.
AT49BV512-12JC 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:
- 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-PLCC (13.97x11.43)
AT49BV512-12JC FAQ
1.How can I place an order for AT49BV512-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV512-12JC 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 AT49BV512-12JC reliable?
The price and inventory of AT49BV512-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV512-12JC is usually 5 days.
3.What payment methods are accepted for AT49BV512-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV512-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV512-12JC?
AT49BV512-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV512-12JC 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 AT49BV512-12JC?
For technical support, including AT49BV512-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV512-12JC requirements.
6.How does Aetrix verify that AT49BV512-12JC is sourced from the original manufacturer or authorized distributors?
All AT49BV512-12JC 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 AT49BV512-12JC meets industry standards.
7.What is the process for return or replacement of AT49BV512-12JC?
All AT49BV512-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV512-12JC, 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 AT49BV512-12JC part is unused and in its original packaging.
Return procedure for AT49BV512-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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