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Microchip Technology AT49F512-55JU
- Part No.:
- AT49F512-55JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F512-55JU.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
AT49F512-55JU from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) single-voltage 5V-only Flash memory IC used for nonvolatile code and data storage in embedded systems. It features 55 ns read access time, 10 µs/byte programming, 10-second chip erase, 8K-byte boot block with hardware lockout, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F512-55JU datasheet, AT49F512-55JU pinout, AT49F512-55JU application, or AT49F512-55JU equivalent, key selection criteria include boot-sector write protection, DATA polling/toggle-bit program status detection, 5V-only command interface, and PLCC-32 packaging for legacy board compatibility.
Technical Context
The AT49F512-55JU implements a command-register-based architecture requiring six-byte software sequences for chip erase and boot-block lockout, and four-cycle commands for byte programming. Its internal timer eliminates external timing control during erase and program cycles.
It supports EPROM-like read operation with dual-line CE/OE control for bus contention avoidance, and integrates VCC sense, noise filtering, and multi-input inhibit logic for hardware data protection - all operating at 5V without high-voltage programming pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), organized as 65,536 words × 8 bits - directly maps to 16-bit address bus with full byte-access capability. |
| Read Access Time | 55 ns max - enables direct replacement of 55 ns EPROMs in legacy microcontroller boot memory interfaces. |
| Byte Programming Time | 10 µs typical - allows rapid field updates without system downtime; tBP ≤ 50 µs ensures deterministic timing for host firmware polling loops. |
| Chip Erase Time | 10 seconds max - fixed internal timing eliminates need for external erase controllers or watchdog coordination. |
| Boot Block Size | 8K bytes (0000H–1FFFH) - dedicated secure region for bootloader code, protected by irreversible lockout command sequence. |
| Operating Voltage | 5.0 V ±10% - single-supply operation simplifies power design; VCC sense disables programming below 3.8 V to prevent corruption during brown-out. |
| Power Dissipation | 165 mW active (30 mA @ 5.5 V), 100 µA CMOS standby - suitable for low-power industrial controllers with intermittent firmware update requirements. |
| Endurance | 10,000 program/erase cycles - validated for applications requiring infrequent but reliable field reprogramming over product lifetime. |
Pinout & Package
AT49F512-55JU is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE compliant, with 1.27 mm pitch and 12.45 mm × 14.95 mm body size. Pin 1 identifier is a corner notch on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; latched on falling edge of WE or CE (whichever occurs last). |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; outputs driven during read, inputs sampled during programming; supports DATA polling on I/O7 and toggle-bit detection on I/O6. |
| CE | Chip Enable | Active-low global enable; must be low for read/program; high-Z output when high; used with OE for bus arbitration. |
| OE | Output Enable | Active-low output control; enables data drivers only when CE is also low; prevents bus contention in shared-memory systems. |
| WE | Write Enable | Active-low programming control; initiates command latching and internal program/erase sequences; noise-filtered against <15 ns glitches. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and I/O buffers; internal VCC sense circuitry inhibits programming if voltage drops below 3.8 V. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal circuitry; decoupling required per JEDEC PLCC layout guidelines. |
| NC | No Connect | Two unconnected pins (positions 29 and 30 in PLCC top view); must remain floating - no external connection or pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only command interface | Eliminates need for 12 V or 21 V programming supplies - simplifies PCB layout and reduces BOM count in cost-sensitive industrial designs. |
| Hardware boot block lockout | Irreversible 8K-byte protection via 6-byte software command - ensures bootloader integrity even after repeated field updates to main memory. |
| DATA polling & toggle-bit status | Real-time program/erase completion detection without timers or interrupts - enables deterministic host firmware state machines for in-system programming. |
| VCC sense and noise filtering | Prevents accidental writes during power ramp-up, brown-out, or EMI events - critical for reliability in electrically noisy factory-floor environments. |
| Green (Pb/Halide-free) packaging | RoHS-compliant PLCC-32 package - meets EU WEEE/RoHS and China RoHS requirements for industrial equipment export. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation systems with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding startup code and runtime parameters; accessed at power-on reset and during firmware updates. Use Value: 8K boot block lockout prevents accidental overwrite of safety-critical bootloader; 55 ns access time ensures fast processor initialization without wait states. | Use Scenario: Replacing obsolete EPROMs (e.g., 27C512) in legacy microcontroller-based instrumentation where board space and socket compatibility are constrained. IC Role / Device Role / Timing Role: Drop-in Flash replacement for UV-erasable EPROM sockets; uses identical PLCC-32 footprint and 5V-only interface. Use Value: Eliminates UV eraser requirement and enables in-system reprogramming via existing JTAG or serial debug interfaces - reducing maintenance downtime. |
| Secure Bootloader Storage | Field-Upgradeable HMI Code Storage |
Use Scenario: Holding immutable bootloader code in human-machine interface (HMI) terminals used in medical devices requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure code vault for verified boot chain; boot block locked after initial programming to meet IEC 62304 software lifecycle requirements. Use Value: Hardware-enforced write protection ensures bootloader cannot be altered post-certification - satisfying FDA Class II device software validation requirements. | Use Scenario: Storing display firmware and localized language assets in retail kiosks subject to frequent regional content updates. IC Role / Device Role / Timing Role: Field-upgradable application memory; main array erased and rewritten via host MCU using DATA polling to manage update timing. Use Value: 10-second chip erase and 10 µs/byte programming enable full firmware updates in under 2 seconds - minimizing customer-facing service interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF512-55-4C-NHE | 512 Kbit, 55 ns, 3.3 V core (5 V tolerant I/O), TSOP-32 package - requires level-shifting for pure 5 V systems. | Lacks hardware boot block lockout; uses software-controlled sector protection - less robust for safety-critical bootloader storage. | Select when migrating to 3.3 V systems or when TSOP footprint is preferred; verify VCC tolerance matches host bus voltage. |
| MX29LV512CTTI-55G | 512 Kbit, 55 ns, 3.0 V core (5 V tolerant I/O), TSOP-32 - lower active current (15 mA) but no industrial temp grade in this variant. | Uses standard CFI command set; no dedicated boot block - protection relies on sector locking which is reversible and less tamper-resistant. | Choose for cost-sensitive consumer applications where bootloader integrity is not safety-critical and ambient temperature stays within commercial range. |
Compared with SST39VF512-55-4C-NHE and MX29LV512CTTI-55G, the AT49F512-55JU provides unique hardware-enforced boot block lockout and true 5 V-only operation - making it the only option among the three qualified for industrial-grade, safety-aware firmware storage where irreversible protection and legacy 5 V compatibility are mandatory.
Availability
AT49F512-55JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot memory replacement, secure bootloader storage, and field-upgradeable HMI code storage requiring stable component supply and long-term obsolescence management.
Supply support for AT49F512-55JU 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
Microchip Technology acquired Atmel in 2016 and maintains its Flash memory portfolio, emphasizing industrial reliability, long-lifecycle support, and legacy compatibility for embedded systems.
The AT49F512 product line was designed for 5V-only in-system programmable code storage in industrial controllers, test equipment, and legacy microcontroller platforms requiring EPROM drop-in replacement with enhanced data integrity features.
FAQ
What is the maximum operating temperature range for the AT49F512-55JU?
The AT49F512-55JU is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in Section 7 ("DC and AC Operating Range") of the official datasheet, where "AT49F512-55" is explicitly listed with "Industrial Operating Temperature (Case) -40°C - 85°C". The PLCC-32 package (JU suffix) is qualified across this full range, enabling use in harsh factory-floor environments without derating.
Does the AT49F512-55JU require external high-voltage programming signals?
No, the AT49F512-55JU does not require external high-voltage programming signals. As stated in the "Features" section and Section 1 ("Description"), it is a "5-volt-only in-system programmable and erasable Flash memory" with "Single Voltage Operation – 5V Read / 5V Reprogramming". All commands - including chip erase, byte programming, and boot block lockout - are executed using standard 5 V logic levels applied to CE, OE, WE, and address/data pins.
How is boot block protection enabled on the AT49F512-55JU?
Boot block protection on the AT49F512-55JU is enabled via a six-byte software command sequence: load AAh to address 5555h, 55h to 2AAAh, 80h to 5555h, then AAh to 5555h, 55h to 2AAAh, and 40h to 5555h (Section 26). Once executed, the 8K-byte boot block (0000H–1FFFH) becomes permanently write-protected - no further erase or program operations are possible in that region, ensuring bootloader integrity.
Can the AT49F512-55JU be used as a direct replacement for the 27C512 EPROM?
Yes, the AT49F512-55JU is designed as a functional and pin-compatible replacement for the 27C512 EPROM. It shares the same 32-pin PLCC package, 64K × 8 organization, 5 V operation, and EPROM-like read interface (CE/OE/WE control). Unlike the 27C512, it adds in-system reprogrammability, hardware boot block lockout, and DATA polling - all without requiring changes to existing PCB layouts or address/data bus wiring.
What methods does the AT49F512-55JU provide to detect program/erase completion?
The AT49F512-55JU provides two hardware-supported methods: DATA polling (reading I/O7 returns complement of programmed data until completion, then true data) and toggle-bit detection (I/O6 toggles during operation and stops when complete). Both are detailed in Sections 4.6 and 4.7, require no external components, and can be initiated at any time during the cycle - enabling robust, interrupt-driven or polling-based host firmware implementations for AT49F512-55JU programming control.
AT49F512-55JU 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:
- 55 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)
AT49F512-55JU FAQ
1.How can I place an order for AT49F512-55JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F512-55JU 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 AT49F512-55JU reliable?
The price and inventory of AT49F512-55JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F512-55JU is usually 5 days.
3.What payment methods are accepted for AT49F512-55JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F512-55JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F512-55JU?
AT49F512-55JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F512-55JU 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 AT49F512-55JU?
For technical support, including AT49F512-55JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F512-55JU requirements.
6.How does Aetrix verify that AT49F512-55JU is sourced from the original manufacturer or authorized distributors?
All AT49F512-55JU 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 AT49F512-55JU meets industry standards.
7.What is the process for return or replacement of AT49F512-55JU?
All AT49F512-55JU units undergo pre-shipment inspection (PSI). If there is an issue with AT49F512-55JU, 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 AT49F512-55JU part is unused and in its original packaging.
Return procedure for AT49F512-55JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F512-55JU Tags
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