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Microchip Technology AT29C512-90PC
- Part No.:
- AT29C512-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C512-90PC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,707
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Product details
Overview
AT29C512-90PC from Atmel is a 512 Kbit (64K × 8) 5-volt-only Flash memory IC organized as 65,536 words by 8 bits, featuring 70 ns read access time, 10 ms sector program cycle time, and hardware/software data protection. It operates across commercial temperature range (0°C to 70°C), supports in-system reprogramming via sector-based 128-byte loads, and is used in firmware storage for embedded controllers and industrial PLCs.
For engineers reviewing the AT29C512-90PC datasheet, AT29C512-90PC pinout, AT29C512-90PC application, or AT29C512-90PC equivalent, key selection criteria include 5V-only operation, 90 ns max access time, sector-level erase/program architecture, DATA polling and toggle-bit end-of-write detection, and compatibility with standard EPROM read interfaces.
Technical Context
The AT29C512-90PC implements a sector-programmable Flash architecture with 512 independent 128-byte sectors, each supporting single-cycle erase-and-program via internal latches and timer-controlled sequencing. Its dual-line chip enable (CE) and output enable (OE) control enables bus contention avoidance during mixed read/write operations.
It integrates both hardware-level VCC-sense and noise-filtering protection (15 ns pulse rejection on WE/CE), plus software data protection requiring a three-byte command sequence (AAh/55h/A0h) to enable write access - all while maintaining CMOS/TTL I/O compatibility and 5V ±10% supply tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), enabling full firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 90 ns maximum - defines worst-case timing margin for CPU wait-state configuration |
| Sector Program Time | 10 ms per 128-byte sector - determines minimum firmware update latency in field-upgrade scenarios |
| Endurance | Typical >10,000 write/erase cycles per sector - supports long-term field maintenance without premature wear-out |
| Supply Voltage | 5V ±10% - eliminates need for dedicated programming voltage rails in system design |
| Standby Current | 100 µA CMOS - enables low-power retention in battery-backed or energy-constrained applications |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade industrial control and instrumentation environments |
Pinout & Package
AT29C512-90PC is packaged in a 32-pin, 0.600" wide plastic dual inline package (PDIP), designated as 32P6 per Atmel's ordering information. Pin functions are electrically identical across PDIP, PLCC, and TSOP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; A0–A6 select byte within 128-byte sector, A7–A15 select sector |
| CE | Chip Enable | Active-low global device select; must be low for read or program; high disables outputs and enters standby |
| OE | Output Enable | Active-low output gate; controls data bus drive; high places I/O pins in high-impedance state |
| WE | Write Enable | Active-low write strobe; initiates byte load or program cycle when CE is low and OE is high |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries data during read, byte load, and software command sequences |
| VCC | Power Supply | +5V ±10% main supply; powers core logic and I/O buffers; VCC sense circuitry prevents programming below ~3.8V |
| GND | Ground Reference | Signal and power return path; required for stable operation and noise immunity |
| NC | No Connect | Unbonded pins (positions 6, 10, 11, 24, 25 in PDIP); must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Sector-based programming | Enables partial firmware updates without erasing entire memory - reduces field upgrade time and risk |
| DATA polling & toggle-bit detection | Allows real-time, non-intrusive monitoring of program completion using I/O7 complement or I/O6 toggling |
| Hardware data protection | VCC sensing, 5 ms power-on delay, and noise filtering prevent accidental writes during brown-out or EMI events |
| Software data protection | Three-byte unlock sequence (AAh/55h/A0h) adds secure write gating - critical for certified industrial firmware |
| CMOS/TTL I/O compatibility | Eliminates level-shifting requirements when interfacing with legacy 5V microcontrollers or FPGAs |
Applications
| Industrial PLC Firmware Storage | Embedded Controller Boot Code |
|---|---|
Use Scenario: Storing ladder logic programs and configuration parameters in programmable logic controllers deployed in factory automation systems. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level reprogrammability for field updates without hardware replacement. Use Value: Enables remote firmware patching and parameter tuning while maintaining 10,000-cycle endurance over 10+ year product lifecycles. |
Use Scenario: Holding boot loader and application firmware for 8-bit/16-bit microcontrollers in HVAC controllers and motor drives. IC Role / Device Role / Timing Role: EPROM-compatible read interface with 90 ns access time ensures zero-wait-state execution on legacy bus architectures. Use Value: Reduces BOM count by eliminating separate EPROM + EEPROM combinations; 5V-only operation simplifies power design. |
| Medical Device Configuration Memory | Test Equipment Calibration Data |
Use Scenario: Retaining user-configurable operational modes, safety thresholds, and calibration offsets in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, sector-protected nonvolatile memory where software data protection prevents unauthorized configuration changes. Use Value: Meets IEC 62304 traceability requirements via deterministic write cycles and verified sector erase integrity. |
Use Scenario: Storing instrument-specific calibration coefficients and compensation tables in automated test equipment (ATE) platforms. IC Role / Device Role / Timing Role: High-reliability Flash memory with <100 µA standby current enabling always-on calibration retention during idle periods. Use Value: Eliminates battery-backed SRAM maintenance; 70 ns read speed supports real-time coefficient lookup during measurement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29C512-90JI | Same die and timing, but industrial temperature range (–40°C to +85°C) and PLCC package (32J) | Required for extended-temperature deployments such as outdoor telecom or automotive under-hood modules | Select when operating environment exceeds 70°C ambient or requires surface-mount assembly |
| AT29C512-90TC | Same electrical specs, but TSOP-32 (32T) package - thinner, smaller footprint, and better thermal dissipation | Preferred for space-constrained PCBs in handheld test gear or compact industrial gateways | Select when board area or profile constraints prohibit DIP or PLCC packages |
Compared with AT29C512-90PC, the AT29C512-90JI offers extended thermal robustness at the cost of through-hole assembly, while AT29C512-90TC delivers miniaturization and improved thermal performance - both retain identical sector programming behavior, timing, and software command compatibility.
Availability
AT29C512-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded controller boot code, medical device configuration memory, and test equipment calibration data requiring stable component supply and long-term lifecycle support.
Supply support for AT29C512-90PC 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, with a legacy of robust industrial-grade nonvolatile memory solutions.
The AT29C512 product line was designed for in-system programmable firmware storage in cost-sensitive, 5V-based embedded systems - emphasizing reliability, sector granularity, and compatibility with legacy EPROM interfaces.
FAQ
What is the maximum read access time specified for the AT29C512-90PC?
The AT29C512-90PC has a maximum read access time of 90 ns, as confirmed in the AC Read Characteristics table of the official datasheet (Rev. 0456F). This value applies across the full commercial temperature range (0°C to 70°C) and 5V ±10% supply, and defines the guaranteed timing margin for CPU interface setup and hold calculations.
Does the AT29C512-90PC require high-voltage programming signals?
No, the AT29C512-90PC does not require high-voltage programming signals. It is a 5-volt-only Flash memory: all operations - including sector erase and program - are executed using standard 5V logic levels, with no external VPP or elevated voltage rails needed. Programming is initiated via specific command sequences applied to the I/O bus.
How many sectors does the AT29C512-90PC contain, and what is the size of each sector?
The AT29C512-90PC contains 512 sectors, each sized at 128 bytes. This sector structure is explicitly defined in the Features section and supported by the addressing scheme where A7–A15 select the sector and A0–A6 select the byte within it. Sector-level granularity enables targeted firmware updates without full-chip erasure.
What methods are available to detect the end of a program cycle on the AT29C512-90PC?
The AT29C512-90PC provides two hardware-supported methods: DATA polling (monitoring complement state on I/O7) and the toggle-bit method (observing toggling on I/O6). Both are functional during any phase of the 10 ms program cycle and do not require halting system operation - enabling concurrent background processing.
Is software data protection enabled by default on the AT29C512-90PC?
No, software data protection is disabled by default when the AT29C512-90PC ships from Atmel. It must be explicitly enabled using the three-byte command sequence (AAh to address 5555h, 55h to 2AAAh, then A0h to 5555h). Once enabled, all subsequent program cycles require this same unlock sequence before data loading begins.
AT29C512-90PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C512-90PC FAQ
1.How can I place an order for AT29C512-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-90PC 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 AT29C512-90PC reliable?
The price and inventory of AT29C512-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-90PC is usually 5 days.
3.What payment methods are accepted for AT29C512-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-90PC?
AT29C512-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-90PC 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 AT29C512-90PC?
For technical support, including AT29C512-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-90PC requirements.
6.How does Aetrix verify that AT29C512-90PC is sourced from the original manufacturer or authorized distributors?
All AT29C512-90PC 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 AT29C512-90PC meets industry standards.
7.What is the process for return or replacement of AT29C512-90PC?
All AT29C512-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-90PC, 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 AT29C512-90PC part is unused and in its original packaging.
Return procedure for AT29C512-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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