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Microchip Technology AT29C512-12JI
- Part No.:
- AT29C512-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C512-12JI.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,517
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Product details
Overview
AT29C512-12JI from Atmel is a 512 Kbit (64K × 8) in-system programmable Flash memory IC operating at 5 V ±10%, with 120 ns read access time, sector-based reprogramming (512 sectors × 128 bytes), and industrial temperature range (–40°C to +85°C). It serves as nonvolatile program/data storage in embedded controllers, firmware boot loaders, and industrial PLCs requiring field-upgradable code.
For engineers reviewing the AT29C512-12JI datasheet, AT29C512-12JI pinout, AT29C512-12JI application, or AT29C512-12JI equivalent, key selection criteria include sector erase granularity, 5V-only programming compatibility, DATA polling/Toggle Bit end-of-write detection, hardware/software data protection, and PLCC-32 packaging for through-hole mounting in ruggedized systems.
Technical Context
The AT29C512-12JI implements a sector-erase Flash architecture with internal address/data latches for 128-byte pages, enabling byte-load programming without external latching logic. Its dual-line chip enable (CE) and output enable (OE) control supports flexible bus interfacing and prevents contention during mixed read/write operations.
Programming is initiated via WE-controlled or CE-controlled byte loads, with automatic internal erase-and-program sequencing timed by an on-chip oscillator. End-of-program status is confirmed via I/O7 DATA polling or I/O6 Toggle Bit monitoring-both accessible without halting system operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8), sufficient for firmware images up to 64 KB in microcontroller boot memory |
| Read Access Time | 120 ns maximum - enables direct execution from memory in 8-bit/16-bit MCU systems with ≤8.3 MHz bus timing |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails; compatible with standard TTL/CMOS logic |
| Sector Size | 128 bytes per sector - allows fine-grained updates without erasing full device; supports modular firmware patching |
| Endurance | >10,000 program/erase cycles per sector - supports field firmware upgrades over multi-year product lifecycle |
| Standby Current | 300 µA max (industrial temp) - enables low-power retention in battery-backed or energy-constrained systems |
| Operating Temp | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor telemetry equipment |
Pinout & Package
AT29C512-12JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with JEDEC MS-016 AE variant, suitable for socketed or soldered through-hole mounting in high-reliability industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; A0–A6 select byte within 128-byte sector, A7–A15 select sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; carries data during read, byte load, and polling operations |
| CE | Chip Enable | Active-low device select; must be low for read/write; high forces outputs to high-Z |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention during reads |
| WE | Write Enable | Active-low write strobe; initiates byte load and triggers internal program cycle when CE is low |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and memory array; no secondary voltage required |
| GND | Ground Reference | Signal and power return; decoupling capacitor placement critical near VCC/GND pair |
| NC | No Connect | Unbonded pins (positions 6, 9, 10, 21); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only sector programming | Eliminates need for 12 V programming supplies; simplifies power architecture and reduces BOM cost |
| Hardware data protection | VCC sense (<3.8 V inhibits write), 5 ms power-on delay, and noise filtering (15 ns pulse rejection) prevent spurious writes |
| Software data protection | Three-byte unlock sequence (AA/55/A0) enables/disables write access - supports secure firmware update workflows |
| DATA polling & Toggle Bit | I/O7 complement detection and I/O6 toggling provide real-time, non-intrusive program completion feedback |
| Internal program timer | Automated erase-and-program sequencing ensures consistent 10 ms sector write time without external timing control |
Applications
| Industrial PLC Firmware Storage | Embedded Controller Boot Memory |
|---|---|
Use Scenario: Storing ladder logic programs and configuration parameters in programmable logic controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides deterministic 120 ns read latency for real-time scan-cycle execution. Use Value: Enables remote firmware updates without controller replacement; sector erase preserves valid configuration data during partial code revisions. |
Use Scenario: Holding boot loader and application firmware for 8-bit microcontrollers in HVAC control panels and building automation gateways. IC Role / Device Role / Timing Role: Primary boot memory mapped into MCU address space; supports XIP (execute-in-place) with 5V-tolerant I/O timing. Use Value: Reduces system startup time vs. serial flash; 300 µA standby current extends battery backup duration during AC power loss. |
| Medical Device Calibration Data | Telecom Line Card Configuration |
Use Scenario: Retaining sensor calibration coefficients and safety-critical operational limits in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure parameter storage with software/hardware write protection; accessed only during initialization or service mode. Use Value: Prevents accidental corruption during power cycling; >10,000 endurance cycles support lifetime recalibration across device service intervals. |
Use Scenario: Storing line interface settings (impedance, gain, protocol profiles) in DSLAM and optical line terminal cards. IC Role / Device Role / Timing Role: Field-upgradable configuration store; sector-level erase permits independent updates of analog front-end and digital PHY parameters. Use Value: Avoids full card replacement during network standard migrations; PLCC-32 package withstands thermal cycling in telecom chassis environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV512-120EC | 3 V core / 5 V I/O; 120 ns access; 512 Kbit; supports CFI query; no hardware VCC sense protection | Requires dual-supply design; lacks built-in 5V-only programming simplicity | Select when migrating to lower-voltage systems or needing CFI-compliant firmware tools |
| MX29LV512CTTI-12G | 3 V supply only; 120 ns access; 512 Kbit; sector protection via lock bits; no software unlock sequence | Not 5V-compatible; requires level-shifting for legacy 5V buses; simpler protection model | Select for new 3V designs prioritizing power efficiency over backward compatibility |
Compared with AM29LV512-120EC and MX29LV512CTTI-12G, the AT29C512-12JI uniquely delivers true 5V-only operation with integrated hardware write inhibit and software unlock - making it optimal for retrofitting legacy 5V industrial systems without redesigning power or interface circuitry.
Availability
AT29C512-12JI is available at Aetrix Electronics and suitable for industrial automation, embedded controller boot memory, and medical device calibration storage requiring stable component supply across extended product lifecycles.
Supply support for AT29C512-12JI 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 for industrial, automotive, and IoT applications.
The AT29C512 belongs to Atmel's legacy parallel Flash memory product line, designed specifically for 5V systems requiring in-system reprogrammability, robust data retention, and drop-in EPROM replacement without voltage translation.
FAQ
What is the maximum read access time specification for the AT29C512-12JI?
The AT29C512-12JI has a guaranteed maximum read access time of 120 ns over its full industrial temperature range (–40°C to +85°C) and supply voltage (5 V ±10%). This timing is measured from address stabilization to valid data on I/O0–I/O7 when CE and OE are asserted low and WE is high. The "12" in the part number directly denotes this 120 ns speed grade.
Does the AT29C512-12JI require high-voltage programming signals?
No, the AT29C512-12JI does not require high-voltage programming signals. It is a 5-volt-only Flash memory: all programming, erasing, and reading operations use only the standard 5 V ±10% VCC supply. Programming is initiated via standard WE/CE strobes and verified using DATA polling on I/O7 or Toggle Bit on I/O6 - no external 12 V or 21 V rails are needed.
How many program/erase cycles is the AT29C512-12JI rated for?
The AT29C512-12JI is rated for typical endurance of more than 10,000 program/erase cycles per sector. This specification applies to individual 128-byte sectors and is validated across the full industrial temperature range. Endurance is not specified per byte or per device, but per sector - supporting long-term field firmware updates in deployed equipment.
What package type is used for the AT29C512-12JI?
The AT29C512-12JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, conforming to JEDEC MS-016, Variation AE. It features a square body with J-shaped leads, pin 1 identifier notch, and dimensions of 12.5 mm × 12.5 mm × 3.5 mm (max height). This through-hole package supports socketed deployment and thermal reliability in industrial environments.
Can the AT29C512-12JI be used as a direct replacement for EPROMs like the 27C512?
Yes, the AT29C512-12JI is pin-compatible and functionally compatible with the 27C512 EPROM in read mode (same A0–A15, I/O0–I/O7, CE, OE, WE, VCC, GND pinout), but differs critically in write behavior: it requires sector-based programming with software/hardware protection, unlike one-time-programmable EPROMs. No UV erasure is needed, but firmware update routines must implement byte-load and polling sequences.
AT29C512-12JI 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:
- 10ms
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29C512-12JI FAQ
1.How can I place an order for AT29C512-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-12JI 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 AT29C512-12JI reliable?
The price and inventory of AT29C512-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-12JI is usually 5 days.
3.What payment methods are accepted for AT29C512-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-12JI?
AT29C512-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-12JI 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 AT29C512-12JI?
For technical support, including AT29C512-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-12JI requirements.
6.How does Aetrix verify that AT29C512-12JI is sourced from the original manufacturer or authorized distributors?
All AT29C512-12JI 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 AT29C512-12JI meets industry standards.
7.What is the process for return or replacement of AT29C512-12JI?
All AT29C512-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-12JI, 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 AT29C512-12JI part is unused and in its original packaging.
Return procedure for AT29C512-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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