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Microchip Technology AT29LV512-12JC
- Part No.:
- AT29LV512-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV512-12JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,552
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Product details
Overview
AT29LV512-12JC from Atmel is a 512 Kbit (64K × 8) 3.3V-only Flash memory IC organized as 65,536 words by 8 bits, featuring 120 ns read access time, sector-based reprogramming (512 sectors × 128 bytes), and software data protection. It operates in commercial temperature range (0°C to 70°C) with 15 mA active current and 40 µA CMOS standby current, used in embedded firmware storage and boot code retention.
For engineers reviewing the AT29LV512-12JC datasheet, AT29LV512-12JC pinout, AT29LV512-12JC application, or AT29LV512-12JC equivalent, key selection considerations include sector erase granularity, 3.3V-only operation compatibility, DATA polling/Toggle Bit programming status detection, and PLCC-32 package integration for legacy industrial control and telecom baseband designs.
Technical Context
The AT29LV512-12JC implements a sector-erase Flash architecture with internal address/data latches supporting 128-byte load cycles. Programming requires a three-byte software unlock sequence (AAh→55h→A0h) before byte loading, and automatic sector erase precedes programming without explicit erase command.
It supports dual-line chip enable (CE) and output enable (OE) control for bus contention avoidance, TTL/CMOS-compatible I/O levels, and hardware protections including VCC sense (<1.8V inhibit), 10 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8), sufficient for full boot loader + configuration data in resource-constrained microcontrollers. |
| Read Access Time | 120 ns max - enables direct execution from Flash (XIP) in systems with ≤8.3 MHz bus timing budget. |
| Supply Voltage | 3.3V ±0.3V only - eliminates need for 5V or 12V programming voltage, simplifying power design. |
| Sector Size | 128 bytes per sector - allows fine-grained firmware updates without erasing entire device. |
| Endurance | >10,000 program/erase cycles per sector - supports field-upgradable firmware in industrial controllers. |
| Standby Current | 40 µA at VCC = 3.3V - enables low-power sleep modes in battery-backed or energy-sensitive applications. |
| Operating Temp | 0°C to 70°C - validated for commercial-grade embedded systems including networking equipment and POS terminals. |
Pinout & Package
AT29LV512-12JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package with standard JEDEC MS-016, Variation AE footprint. Pin 1 identifier is located at top-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; A0–A6 select byte within 128-byte sector, A7–A15 select sector. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; supports byte load during programming and true data read after polling completion. |
| CE | Chip Enable | Active-low global enable; must be low for read/write; high forces outputs to high-Z and inhibits programming. |
| OE | Output Enable | Active-low read control; used with CE to gate output drivers and prevent bus contention. |
| WE | Write Enable | Active-low write strobe; controls latching of address/data during byte load; high inhibits all programming. |
| VCC | Power Supply | 3.3V ±0.3V supply input; internal VCC sense disables programming if voltage drops below 1.8V. |
| GND | Ground Reference | Signal and power return; required for stable logic thresholds and low-noise data sampling. |
| NC | No Connect | Two unconnected pins (pins 6 and 10 in PLCC top view); must remain floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h→2AAAh→5555h) prevents accidental writes; required before every sector program cycle. |
| DATA Polling & Toggle Bit | I/O7 complement indicates programming progress; I/O6 toggling provides hardware-agnostic end-of-cycle detection without external timers. |
| Single-Cycle Sector Reprogram | Entire 128-byte sector erased and programmed automatically after byte load - no separate erase command needed. |
| Internal Address/Data Latches | Latches capture full sector data at microprocessor speed, freeing address/data bus for concurrent operations during programming. |
| Hardware Program Inhibit | VCC sense, 10 ms power-on delay, OE/CE/WE state monitoring, and 15 ns noise filter collectively eliminate spurious writes. |
Applications
| Industrial PLC Firmware Storage | Telecom Baseband Boot Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing XIP-capable instruction storage with sector-level update capability. Use Value: Enables field firmware upgrades without full device replacement; 120 ns access supports real-time scan cycle timing in deterministic control loops. |
Use Scenario: Holding boot code and DSP initialization tables in wireless base station transceivers operating in temperature-stressed enclosures. IC Role / Device Role / Timing Role: Primary boot ROM accessed at power-on reset; supports fast initialization under tight system startup deadlines. Use Value: 40 µA standby current extends uptime during maintenance mode; PLCC-32 package ensures mechanical reliability in vibration-prone rack-mount chassis. |
| POS Terminal Configuration Memory | Legacy Medical Device Parameter Storage |
Use Scenario: Retaining tax rate tables, merchant IDs, and peripheral calibration data across power cycles in point-of-sale terminals. IC Role / Device Role / Timing Role: Parameter EEPROM replacement offering higher endurance and faster write verification via DATA polling. Use Value: >10,000 write cycles support daily parameter updates over 10+ year product lifetime; software protection prevents corruption during brown-out events. |
Use Scenario: Storing FDA-mandated calibration coefficients and safety-critical operational limits in Class II medical diagnostic instruments. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware and software write inhibition to meet IEC 62304 traceability requirements. Use Value: Dual protection (VCC sense + 3-byte unlock) ensures parameter integrity during power transitions; sector granularity isolates updates to single calibration sets. |
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), 3.3V operation, but uses uniform 4-KB blocks instead of 128-byte sectors; lacks DATA polling (relies on Toggle Bit only). | Less suitable for fine-grained firmware patching; better for full-image updates where block size aligns with bootloader partitioning. | Select SST39VF512 only if system firmware layout matches 4-KB boundaries and polling-free status detection is acceptable. |
| MX29LV512C | Pin-compatible PLCC-32 variant with identical 120 ns access and sector architecture, but adds hardware write protect (WP#) pin and extended -40°C to +85°C industrial temp option. | Requires minor PCB change to route WP# signal; supports wider temperature range without derating. | Choose MX29LV512C for new designs needing enhanced write protection or industrial temperature compliance. |
Compared with AT29LV512-12JC, SST39VF512 trades sector flexibility for larger erase blocks and simplified status detection, while MX29LV512C retains full functional equivalence plus hardware write protection and extended temperature support - making it a drop-in upgrade path for robustness-critical deployments.
Availability
AT29LV512-12JC is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and point-of-sale terminals requiring stable component supply and long-term obsolescence management.
Supply support for AT29LV512-12JC 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 semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication devices.
The AT29LV512-12JC belongs to Atmel's legacy LV-series Flash memory product line, designed specifically for 3.3V-only embedded systems requiring in-system reprogrammability with minimal external circuitry.
FAQ
What is the maximum operating frequency supported by AT29LV512-12JC?
The AT29LV512-12JC does not specify a maximum clock frequency because it is an asynchronous parallel Flash memory. Its timing is governed by access times: tACC = 120 ns max defines the minimum interval between address setup and valid data output. System bus speed is constrained by this parameter - for example, a 120 ns access time supports up to ~8.3 MHz effective read throughput when interfaced with a microcontroller using standard wait-state logic.
Does AT29LV512-12JC support hardware write protection via a dedicated pin?
No, AT29LV512-12JC does not include a hardware write protect (WP#) pin. Write protection is implemented exclusively through software means: a mandatory three-byte unlock sequence (AAh→55h→A0h) must precede any sector programming. Hardware safeguards include VCC sensing, 10 ms power-on delay, and noise filtering on WE/CE, but no dedicated pin-based lock mechanism exists on the AT29LV512-12JC.
Can AT29LV512-12JC be used in place of a standard EPROM like 27C512?
AT29LV512-12JC is functionally compatible with 27C512 in read mode (same pinout, address/data bus, CE/OE/WE control), but differs critically in programming: it requires 3.3V-only commands and software unlocking instead of 12V VPP. Direct substitution is possible for read-only applications, but in-system reprogramming requires redesigning the write algorithm and verifying timing margins due to sector-based erase versus full-chip erase.
What is the purpose of the NC pins on AT29LV512-12JC's PLCC-32 package?
AT29LV512-12JC has two NC (No Connect) pins - pin 6 and pin 10 in the PLCC-32 top-view layout. These pins are internally unconnected and must remain electrically floating in the PCB layout. They serve mechanical or manufacturing purposes (e.g., mold alignment, thermal relief) and have no electrical function; connecting them to VCC, GND, or signals may cause unpredictable behavior or damage per the datasheet.
How is end-of-program detection implemented in AT29LV512-12JC?
AT29LV512-12JC provides two independent end-of-program detection methods: DATA polling on I/O7 (complement of loaded data until completion, then true data) and Toggle Bit detection on I/O6 (toggles between 0/1 during programming, stabilizes upon completion). Both methods operate without external clocks or timers and can be initiated at any time during the 20 ms max program cycle, enabling efficient CPU polling or interrupt-driven status checking.
AT29LV512-12JC 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:
- 20ms
- Access Time:
- 120 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29LV512-12JC FAQ
1.How can I place an order for AT29LV512-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV512-12JC 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 AT29LV512-12JC reliable?
The price and inventory of AT29LV512-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV512-12JC is usually 5 days.
3.What payment methods are accepted for AT29LV512-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV512-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV512-12JC?
AT29LV512-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV512-12JC 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 AT29LV512-12JC?
For technical support, including AT29LV512-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV512-12JC requirements.
6.How does Aetrix verify that AT29LV512-12JC is sourced from the original manufacturer or authorized distributors?
All AT29LV512-12JC 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 AT29LV512-12JC meets industry standards.
7.What is the process for return or replacement of AT29LV512-12JC?
All AT29LV512-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV512-12JC, 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 AT29LV512-12JC part is unused and in its original packaging.
Return procedure for AT29LV512-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV512-12JC Tags
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