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Microchip Technology AT29C512-90TC
- Part No.:
- AT29C512-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C512-90TC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,869
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Product details
Overview
AT29C512-90TC from Atmel is a 512 Kbit (64K × 8) CMOS Flash memory IC designed for in-system reprogrammability with 5 V only operation, 90 ns read access time, sector-based programming (512 sectors × 128 bytes), and hardware/software data protection - used in embedded firmware storage, industrial controller boot memory, and legacy system BIOS replacement.
For engineers reviewing the AT29C512-90TC datasheet, AT29C512-90TC pinout, AT29C512-90TC application, or AT29C512-90TC equivalent, key selection considerations include commercial temperature range (0°C to 70°C), TSOP-32 package compatibility, 5 V ±10% supply tolerance, sector erase granularity, and DATA polling/Toggle Bit program status detection methods.
Technical Context
The AT29C512-90TC implements a sector-program architecture where each 128-byte sector is erased and programmed in a single internal cycle using an on-chip timer; address latching occurs on falling CE or WE edges, and data latching follows the first rising edge of CE or WE. It supports EPROM-like read timing with dual-line control (CE/OE active-low).
Hardware data protection uses VCC sense (<3.8 V inhibit), 5 ms power-on delay, and noise filtering (<15 ns pulse rejection); software protection requires a three-byte command sequence (AAh/55h/A0h) to enable, and AAh/55h/80h/AAh/55h/20h to disable - both modes coexist and persist across power cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8), sufficient for firmware images up to 64 KB in size |
| Read Access Time | 90 ns max - defines minimum bus cycle time for reliable CPU read operations |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage regulators |
| Sector Size | 128 bytes per sector - enables fine-grained updates without full chip erase |
| Endurance | >10,000 program/erase cycles per sector - supports field firmware upgrades over product lifetime |
| Standby Current | 100 µA typical (CMOS) - enables low-power retention in battery-backed systems |
| Active Current | 50 mA max at 5 MHz - determines thermal and regulator sizing in high-throughput write scenarios |
Pinout & Package
AT29C512-90TC is packaged in a 32-lead Thin Small Outline Package (TSOP, Type I, 8 × 20 mm, JEDEC MO-142 BD), with gull-wing leads, 0.5 mm pitch, and pin 1 identifier marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus for accessing all 64K locations; A7–A15 select sector, A0–A6 select byte within sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with TTL/CMOS logic levels; carries data during read, byte load, and program |
| CE | Chip Enable | Active-low global device select; must be low for read, program, or identification mode entry |
| OE | Output Enable | Active-low output gate; controls data bus drive during read; high during program to prevent contention |
| WE | Write Enable | Active-low control for byte loading and program initiation; used with CE for timing-critical sector programming |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O buffers; internally monitored for programming safety |
| GND | Ground Reference | Signal and power return path; required for stable operation and noise immunity |
| NC | No Connect | Unbonded pins (positions 6, 9, 10, 11 in TSOP top view); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V Reprogramming | Eliminates need for +12 V programming supplies - simplifies board-level power design and reduces BOM cost |
| Internal Sector Address/Data Latches | Allows full 128-byte sector data to be loaded while freeing address/data bus for other system activity |
| DATA Polling & Toggle Bit Detection | Enables real-time program completion monitoring without external timers or interrupts - improves firmware update reliability |
| Dual Data Protection | Hardware (VCC sense, noise filter) and software (3-byte command lock) layers prevent accidental writes during power transitions or noise events |
| CMOS/TTL I/O Compatibility | Interoperates directly with legacy microcontrollers and FPGAs without level-shifting circuitry |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Replacement |
|---|---|
Use Scenario: Storing configuration and control logic in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot and runtime firmware storage with in-field update capability via RS-232 or CAN-based loader. Use Value: Sector erase allows patching individual function blocks without disrupting operational code; 10,000-cycle endurance supports multi-year maintenance cycles. |
Use Scenario: Replacing obsolete EPROMs in older desktop motherboards requiring BIOS updates without socket replacement. IC Role / Device Role / Timing Role: Drop-in-compatible Flash memory emulating EPROM read behavior while enabling in-system reprogramming. Use Value: 90 ns access matches original EPROM timing; 5 V-only operation avoids adding high-voltage programming circuitry to legacy designs. |
| Embedded Instrument Bootloader | Telecom Line Card Configuration |
Use Scenario: Holding bootloader code and calibration tables in portable test equipment with limited PCB space. IC Role / Device Role / Timing Role: Primary boot memory accessed at power-up by microcontroller; supports secure firmware validation before execution. Use Value: TSOP-32 package minimizes footprint vs. PDIP; software data protection prevents unauthorized bootloader modification during service. |
Use Scenario: Storing line-specific initialization parameters and protocol stacks in telecom access equipment operating across wide temperature ranges. IC Role / Device Role / Timing Role: Configuration memory mapped into processor address space; updated during card insertion or remote management. Use Value: Industrial temperature rating (-40°C to +85°C) ensures reliability in uncontrolled cabinet environments; hardware VCC sensing prevents corruption during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29F512-90JC | 5 V-only, 90 ns, 512 Kbit, PLCC-32; lacks software data protection and DATA polling | Requires external hardware protection; no built-in program status feedback - increases firmware complexity | Preferred when PLCC packaging is mandatory and software protection is not required |
| SST39SF512-90-3C-PHE | 5 V-only, 90 ns, 512 Kbit, TSOP-32; includes byte-programming (not sector-only) and enhanced security registers | Supports single-byte updates without sector reload; adds password-protected block locking | Chosen when incremental firmware patches or stronger access control are needed beyond AT29C512-90TC capabilities |
Compared with AM29F512-90JC and SST39SF512-90-3C-PHE, the AT29C512-90TC offers balanced sector-based reprogrammability with integrated software/hardware protection and status polling - making it optimal for cost-sensitive, field-upgradable embedded systems where moderate update granularity suffices.
Availability
AT29C512-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS replacement, and embedded instrument bootloader applications requiring stable component supply and long-term obsolescence management.
Supply support for AT29C512-90TC 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and wireless solutions for embedded systems.
The AT29C512 belongs to Atmel's legacy parallel Flash memory product line, engineered for drop-in EPROM replacement and in-system firmware updates in cost-sensitive industrial and computing applications.
FAQ
What is the operating temperature range for AT29C512-90TC?
The AT29C512-90TC is rated for commercial temperature operation from 0°C to +70°C. This range is confirmed in the Ordering Information table and applies specifically to the -90TC suffix variant, distinguishing it from industrial-grade versions like -90TI which operate from -40°C to +85°C.
Does AT29C512-90TC require high-voltage programming signals?
No, AT29C512-90TC operates with 5 V only - no high-voltage programming signals are needed. Programming is initiated using standard 5 V logic levels and specific command sequences applied to the address and data bus, eliminating external HV generators and simplifying system design.
How is program completion detected on AT29C512-90TC?
AT29C512-90TC supports two hardware-supported methods: DATA polling (reading I/O7 returns complement until complete, then true data) and Toggle Bit (I/O6 toggles during programming and stops when done). Both methods allow real-time, interrupt-free status monitoring without external timing components.
What package type does AT29C512-90TC use?
AT29C512-90TC uses a 32-lead Thin Small Outline Package (TSOP, Type I, 8 × 20 mm, JEDEC MO-142 BD). Pin 1 is marked on the top surface, and the package features gull-wing leads with 0.5 mm pitch - verified in the "Ordering Information" and "Packaging Information" sections of the datasheet.
Can AT29C512-90TC be used as a direct replacement for EPROMs like 27C512?
Yes, AT29C512-90TC is designed as a functional and pin-compatible replacement for 27C512 EPROMs in read mode, with identical 32-pin DIP/PLCC/TSOP footprints and EPROM-like read timing. However, write operations require command sequences instead of UV erasure, and sector-based programming differs from byte-wise EPROM programming.
AT29C512-90TC 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:
- 10ms
- 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
AT29C512-90TC FAQ
1.How can I place an order for AT29C512-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-90TC 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 AT29C512-90TC reliable?
The price and inventory of AT29C512-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-90TC is usually 5 days.
3.What payment methods are accepted for AT29C512-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-90TC?
AT29C512-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-90TC 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 AT29C512-90TC?
For technical support, including AT29C512-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-90TC requirements.
6.How does Aetrix verify that AT29C512-90TC is sourced from the original manufacturer or authorized distributors?
All AT29C512-90TC 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 AT29C512-90TC meets industry standards.
7.What is the process for return or replacement of AT29C512-90TC?
All AT29C512-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-90TC, 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 AT29C512-90TC part is unused and in its original packaging.
Return procedure for AT29C512-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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