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Microchip Technology AT49F512-90TC
- Part No.:
- AT49F512-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F512-90TC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,826
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Product details
Overview
AT49F512-90TC from Atmel is a 512 Kbit (64K × 8) single-supply 5V-only CMOS Flash memory IC used for nonvolatile program/data storage in embedded microcontroller systems. It delivers 90 ns read access time, 10 µs/byte programming, and supports hardware data protection with an 8K-byte boot block featuring programmable lockout. It is commonly deployed in firmware update-capable industrial controllers.
For engineers reviewing the AT49F512-90TC datasheet, AT49F512-90TC pinout, AT49F512-90TC application, or AT49F512-90TC equivalent, key selection criteria include its 5V-only operation, boot block write lockout capability, DATA polling/Toggle Bit end-of-program detection, and TSOP-32 package compatibility with space-constrained PCB layouts.
Technical Context
The AT49F512-90TC operates exclusively at 5V ±10%, eliminating need for dual-voltage programming circuitry. Its architecture uses internal command register-based byte programming and chip erase via six-byte software sequences, enabling in-system reprogrammability without external high-voltage generators.
It implements dual hardware protection: VCC sense (inhibits programming below 3.8V) and noise filtering (rejects <15 ns pulses on WE/CE). Boot block lockout is activated by a specific 6-cycle command sequence targeting address range 0000H–1FFFH, permanently preventing further writes to that 8K-byte region once enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), sufficient for full firmware images in 8-bit microcontroller boot loaders |
| Read Access Time | 90 ns max - determines worst-case instruction fetch latency in CPU-memory interface timing budgets |
| Byte Programming Time | 10 µs typical - enables rapid field updates of small configuration or calibration data segments |
| Erase Cycle Time | 10 seconds max for full chip - defines minimum downtime during firmware upgrade procedures |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware |
| Boot Block Protection | 8K-byte (0000H–1FFFH) lockout via 6-byte command sequence - ensures secure bootloader persistence across main memory updates |
| Power Dissipation | 30 mA active / 100 µA CMOS standby - supports low-power sleep modes in battery-backed or energy-sensitive systems |
| Endurance | 10,000 write/erase cycles - qualifies for long-life deployment in infrequently updated control applications |
Pinout & Package
AT49F512-90TC is packaged in a 32-lead Thin Small Outline Package (TSOP), Type 1, 8 × 20 mm footprint, compliant with JEDEC MO-153, suitable for automated surface-mount assembly and high-density board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; A0 least significant bit |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification operations; high-impedance when deselected |
| CE | Chip Enable | Active-low device select; must be low for read/write; enables hardware program inhibition when high |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention; high disables outputs to high-Z |
| WE | Write Enable | Active-low write strobe; latches address/data during programming; inhibits program if held high |
| VCC | Power Supply | +5V ±10% supply; powers all internal logic and charge pumps; VCC sense prevents programming below 3.8V |
| GND | Ground Reference | Signal and power ground reference plane; required for stable read/write margins and noise immunity |
| NC | No Connect | Unbonded pins (positions 1, 2, 31, 32 in TSOP layout); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only operation | Eliminates need for dedicated 12V programming voltage rails or charge pump circuitry on target board |
| Hardware data protection | Combines VCC sensing, OE/CE/WE inhibit logic, and 15 ns noise filtering to prevent spurious writes |
| DATA polling & Toggle Bit | Enables deterministic, clock-independent end-of-program detection without fixed timeout loops |
| Boot block lockout | Secures 8K-byte region (0000H–1FFFH) against accidental overwrite after activation via command sequence |
| Software product identification | Allows host system to auto-detect manufacturer (1FH) and device code (03H) without external programming tools |
| CMOS standby current | 100 µA max at 0°C–70°C enables ultra-low-power retention in always-on embedded systems |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O mapping tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile program memory providing fast 90 ns read access for real-time scan cycle execution. Use Value: Boot block lockout ensures bootloader integrity while allowing field-upgradable application logic in main memory. | Use Scenario: Retaining calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure configuration storage with hardware write protection to meet IEC 62304 data integrity requirements. Use Value: 10,000-cycle endurance and DATA polling support reliable, traceable parameter updates during service intervals. |
| Automotive Body Control Module | Network Router Bootloader Storage |
Use Scenario: Holding firmware for door lock actuators, lighting control, and CAN gateway logic in passenger vehicles. IC Role / Device Role / Timing Role: In-system programmable flash memory interfaced directly to 8-bit microcontrollers via standard parallel bus. Use Value: 5V-only operation simplifies power design; TSOP-32 package fits compact under-hood ECU layouts. | Use Scenario: Storing primary bootloader code that initializes DRAM, loads Linux kernel, and verifies firmware signatures. IC Role / Device Role / Timing Role: Trusted boot memory with permanent lockout for first-stage boot code to prevent tampering. Use Value: Boot block (0000H–1FFFH) provides dedicated, write-protected region for immutable startup instructions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV512-90EC | 3V core with 5V I/O tolerance; 90 ns access; requires VPP = 12V for programming | Designed for mixed-voltage systems; not 5V-only; higher pin count (48-pin TSOP) | Choose only if migrating to lower core voltage; requires redesign of power and programming circuitry |
| SST39VF512-90-4C-NHE | 3.3V supply; 90 ns access; 512 Kbit; no boot block lockout; supports page mode reads | Optimized for low-power portable devices; lacks hardware-secured boot region | Select when power budget is critical and bootloader protection is handled in software or external logic |
Compared with AM29LV512-90EC and SST39VF512-90-4C-NHE, the AT49F512-90TC uniquely delivers true 5V-only operation with integrated boot block lockout-enabling simpler power design and hardware-enforced firmware partitioning without external security ICs.
Availability
AT49F512-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49F512-90TC 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 secure authentication ICs.
The AT49F512-90TC belongs to Atmel's legacy parallel-interface Flash memory product line, designed specifically for cost-sensitive, in-system programmable firmware storage in 8-bit and 16-bit embedded systems.
FAQ
What is the operating temperature range for the AT49F512-90TC?
The AT49F512-90TC is rated for commercial temperature operation from 0°C to +70°C. Its datasheet specifies DC and AC parameters under this range, including 90 ns maximum read access time and 100 µA maximum CMOS standby current. Industrial-grade variants (e.g., AT49F512-90TI) extend operation to –40°C to +85°C, but the -90TC suffix confirms the commercial grade. Always verify thermal derating in your final PCB layout.
Does the AT49F512-90TC require external high-voltage programming signals?
No, the AT49F512-90TC does not require external high-voltage programming signals. It operates with 5V-only supply and uses internally generated programming voltages. All programming commands-including byte programming, chip erase, and boot block lockout-are executed via standard 5V logic-level signals (CE, OE, WE) and address/data bus transactions, eliminating need for VPP = 12V circuitry.
How is boot block lockout enabled on the AT49F512-90TC?
Boot block lockout on the AT49F512-90TC is enabled by executing a precise six-cycle command sequence: load 0xAA to address 0x5555, 0x55 to 0x2AAA, then 0x40 to 0x5555, with a 1-second pause before final confirmation. Once activated, the 8K-byte region (0000H–1FFFH) becomes permanently write-protected. The AT49F512-90TC datasheet provides full timing and bus-cycle details in the Command Definition table.
Can the AT49F512-90TC be used in place of EPROMs like the 27C512?
Yes, the AT49F512-90TC is pin-compatible and functionally compatible with 27C512 EPROMs in read mode, sharing identical 32-pin TSOP footprint and parallel bus interface (A0–A15, I/O0–I/O7, CE, OE, WE). However, unlike EPROMs, the AT49F512-90TC supports in-system erasure and reprogramming without UV exposure or socket removal-making it a direct drop-in replacement for field-upgradable designs.
What methods does the AT49F512-90TC provide to detect completion of a programming cycle?
The AT49F512-90TC provides two hardware-supported methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit detection (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both methods allow host firmware to avoid fixed delays and synchronize precisely with the AT49F512-90TC's internal timing, improving update reliability.
AT49F512-90TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F512-90TC FAQ
1.How can I place an order for AT49F512-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F512-90TC 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 AT49F512-90TC reliable?
The price and inventory of AT49F512-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F512-90TC is usually 5 days.
3.What payment methods are accepted for AT49F512-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F512-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F512-90TC?
AT49F512-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F512-90TC 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 AT49F512-90TC?
For technical support, including AT49F512-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F512-90TC requirements.
6.How does Aetrix verify that AT49F512-90TC is sourced from the original manufacturer or authorized distributors?
All AT49F512-90TC 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 AT49F512-90TC meets industry standards.
7.What is the process for return or replacement of AT49F512-90TC?
All AT49F512-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F512-90TC, 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 AT49F512-90TC part is unused and in its original packaging.
Return procedure for AT49F512-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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