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Microchip Technology AT49F512-70JC
- Part No.:
- AT49F512-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F512-70JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
AT49F512-70JC from Atmel is a 512K-bit (64K × 8) single-voltage 5V-only CMOS Flash memory IC used for nonvolatile program/data storage in embedded boot code and firmware applications. It delivers 70 ns read access time, 10 µs/byte programming, 10-second chip erase, and features an 8K-byte boot block with hardware lockout. Designed for industrial control and legacy system upgrades requiring in-system reprogrammability without high-voltage support.
For engineers reviewing the AT49F512-70JC datasheet, AT49F512-70JC pinout, AT49F512-70JC application, or AT49F512-70JC equivalent, key selection criteria include 5V-only operation, boot sector protection, DATA polling/Toggle Bit end-of-cycle detection, and PLCC-32 packaging compatibility with legacy EPROM sockets.
Technical Context
The AT49F512-70JC implements a command-register-based architecture for byte programming and chip erase using six-byte software sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h → 5555h/AAh → 2AAAh/55h → 5555h/10h). It supports standard EPROM read timing with dual-line CE/OE control to prevent bus contention.
Hardware data protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses rejected), and active inhibit via OE low/CE high/WE high states. Boot block lockout (0000h–1FFFh) is enabled via a dedicated 6-command sequence and verified by I/O0 status during software product ID mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - supports full firmware images for 8-bit microcontrollers |
| Read Access Time | 70 ns - meets timing requirements for 14 MHz Z80/8086 bus systems |
| Byte Programming Time | 10 µs - enables rapid field updates without external high-voltage circuitry |
| Chip Erase Time | 10 seconds - deterministic full-array reset without external timers or supervision |
| End-of-Cycle Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay loops in host firmware |
| Boot Block Size | 8 KB (0000h–1FFFh) - isolates secure boot loader from application updates |
| Write Endurance | 10,000 cycles - suitable for infrequent configuration or calibration storage |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed systems |
Pinout & Package
AT49F512-70JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with industry-standard 32-pin EPROM sockets and suitable for surface-mount rework in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on falling edge of WE or CE (whichever occurs last) |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; supports true read, byte write, and status polling (I/O6/I/O7) |
| CE | Chip Enable | Active-low device select; must be low with OE low and WE high for read operations |
| OE | Output Enable | Active-low output control; high-Z when asserted high to prevent bus contention |
| WE | Write Enable | Active-low programming control; initiates command register loading and byte programming |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if voltage drops below 3.8V |
| GND | Ground | Reference return path for all signals and power |
| NC | No Connect | Pins 1, 2, 31, 32 (PLCC top view) - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only Reprogramming | Eliminates need for +12V or +25V programming supplies - simplifies system-level power design |
| Hardware Boot Block Lockout | Prevents accidental overwrite of critical boot code at 0000h–1FFFh after activation via 6-byte command sequence |
| DATA Polling & Toggle Bit | Enables real-time, clockless end-of-program/erase detection without fixed timeout delays |
| Internal Program Timer | Automatically generates required programming pulses - no external timing components needed |
| CMOS Standby Current | 100 µA max at 5V - reduces quiescent power in always-on embedded controllers |
| VCC Sense Protection | Blocks programming if VCC falls below 3.8V - prevents corrupted writes during brown-out conditions |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Backup |
|---|---|
Use Scenario: Storing field-upgradable ladder logic and I/O configuration in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability and hardware-protected boot sector. Use Value: Enables remote firmware patches without removing the module; boot lockout ensures PLC always boots reliably after update. | Use Scenario: Providing hot-swappable BIOS backup storage in industrial motherboards where primary flash may be inaccessible during service. IC Role / Device Role / Timing Role: Secondary 512K-bit EPROM-compatible boot memory with identical 70 ns read timing. Use Value: Maintains system uptime during BIOS corruption events; PLCC-32 package allows socketed replacement without soldering. |
| Embedded Instrument Boot Loader | Telecom Line Card Configuration |
Use Scenario: Hosting secure boot loader code that initializes DSPs and FPGAs before loading application firmware from external media. IC Role / Device Role / Timing Role: Protected boot memory with hardware lockout preventing unauthorized modification of startup sequence. Use Value: Ensures cryptographic integrity of boot process; 10,000 write cycles support lifetime field calibration updates. | Use Scenario: Storing line-specific provisioning parameters (e.g., gain tables, protocol settings) in carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: Low-power, byte-programmable nonvolatile storage accessible over shared microcontroller bus. Use Value: 100 µA standby current extends card shelf life; DATA polling enables concurrent host CPU operation during writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29F040B-70JC | 4 Mbit (512K × 8), 70 ns access, requires 12V VPP for programming | Lacks boot block lockout and DATA polling; uses older AMD command set | Select only if legacy 12V programming infrastructure exists and boot protection is not required |
| SST39VF512-70-4C-NHE | 512 Kbit, 70 ns, 3.3V core with 5V I/O tolerance, no boot block feature | Lower active current (15 mA), but incompatible 5V-only bus timing and missing lockout | Choose for new 3.3V designs needing lower power; not drop-in for AT49F512-70JC socketed upgrades |
Compared with AM29F040B-70JC and SST39VF512-70-4C-NHE, the AT49F512-70JC uniquely combines 5V-only operation, hardware-enforced boot block protection, and dual end-of-cycle detection - making it the only option for retrofitting secure, high-reliability firmware storage into existing 5V EPROM-based systems without board redesign.
Availability
AT49F512-70JC is available at Aetrix Electronics and suitable for industrial PLCs, legacy PC BIOS backup modules, embedded instrument boot loaders, telecom line cards, and automotive ECU calibration storage requiring stable component supply across extended lifecycles.
Supply support for AT49F512-70JC 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, nonvolatile memory, and security ICs for industrial and embedded markets.
The AT49F512 product line was designed specifically for 5V-only in-system reprogrammability in legacy EPROM-replacement applications, emphasizing boot sector integrity and robust hardware data protection.
FAQ
What is the maximum operating temperature range for the AT49F512-70JC?
The AT49F512-70JC is rated for commercial temperature operation from 0°C to +70°C. Its PLCC-32 package and internal thermal design support reliable operation within this range under continuous read/write cycling, provided PCB layout maintains adequate copper pour and airflow per Atmel's thermal guidelines. The AT49F512-70JI variant extends this to -40°C to +85°C for industrial use.
Does the AT49F512-70JC require external high-voltage circuitry for programming?
No, the AT49F512-70JC does not require external high-voltage circuitry. It supports 5V-only programming using standardized command sequences loaded via the address and data bus. Internal charge pumps generate necessary voltages, and hardware VCC sensing (3.8V threshold) automatically inhibits programming if supply voltage is insufficient - ensuring safe, single-rail operation.
How is boot block protection activated on the AT49F512-70JC?
Boot block protection on the AT49F512-70JC is activated by executing a precise six-byte command sequence: load 0xAA to address 0x5555, 0x55 to 0x2AAA, 0x80 to 0x5555, then 0xAA to 0x5555, 0x55 to 0x2AAA, and finally 0x40 to 0x5555. Once executed, the 8K-byte region (0000h–1FFFh) becomes permanently write- and erase-locked, verified by reading I/O0 during software product ID mode.
Can the AT49F512-70JC be used as a direct replacement for standard EPROMs like the 27C512?
Yes, the AT49F512-70JC is pin- and function-compatible with the 27C512 EPROM in read mode (CE/OE/WE timing, address/data bus, output drive strength), enabling socketed replacement. However, programming requires command-based sequences instead of UV erasure and high-voltage pulsing - so host firmware or programmer must support Atmel's protocol, not just EPROM-style algorithms.
What methods does the AT49F512-70JC provide to detect completion of a programming cycle?
The AT49F512-70JC provides two independent hardware methods: DATA polling (reading the programmed byte returns its complement on I/O7 until complete, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during programming/erasure and stops when complete). Both methods allow the host controller to poll asynchronously without fixed delays, improving system responsiveness and reliability.
AT49F512-70JC 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:
- 50µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F512-70JC FAQ
1.How can I place an order for AT49F512-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F512-70JC 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 AT49F512-70JC reliable?
The price and inventory of AT49F512-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F512-70JC is usually 5 days.
3.What payment methods are accepted for AT49F512-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F512-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F512-70JC?
AT49F512-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F512-70JC 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 AT49F512-70JC?
For technical support, including AT49F512-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F512-70JC requirements.
6.How does Aetrix verify that AT49F512-70JC is sourced from the original manufacturer or authorized distributors?
All AT49F512-70JC 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 AT49F512-70JC meets industry standards.
7.What is the process for return or replacement of AT49F512-70JC?
All AT49F512-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F512-70JC, 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 AT49F512-70JC part is unused and in its original packaging.
Return procedure for AT49F512-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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