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Microchip Technology AT29C020-15TI
- Part No.:
- AT29C020-15TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-15TI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
AT29C020-15TI from Atmel is a 2-megabit (256K × 8) 5-volt-only Flash memory IC used for nonvolatile code and data storage in embedded systems. It features 70 ns read access time, 10 ms sector program cycle time, 10,000 write/erase endurance, CMOS/TTL-compatible I/O, and operates across –40°C to +85°C industrial temperature range. It supports in-system reprogramming via sector-based architecture with hardware and software data protection.
For engineers reviewing the AT29C020-15TI datasheet, AT29C020-15TI pinout, AT29C020-15TI application, or AT29C020-15TI equivalent, key selection considerations include its 32-pin PLCC package, 256-byte sector granularity, boot block lockout capability, DATA polling and toggle-bit programming status detection, and compatibility with standard EPROM read interfaces.
Technical Context
The AT29C020-15TI implements a sector-erase Flash architecture with 1024 independent 256-byte sectors, enabling selective reprogramming without full-chip erasure. Its internal address and data latches support burst loading of an entire sector before automatic erase-and-program execution controlled by an on-chip timer.
It integrates dual protection mechanisms: hardware-level VCC sensing (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and CE/OE/WE state monitoring; plus software-controlled data protection requiring a three-byte command sequence (AAh/55h/A0h) to enable/disable writes. Boot block lockout applies independently to two 8 KB regions at memory extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K bytes - supports firmware storage for microcontrollers with up to 256 KB address space. |
| Read Access Time | 150 ns max - compatible with 6.7 MHz bus timing; meets timing for legacy 8/16-bit microprocessor systems. |
| Sector Size | 256 bytes per sector - enables fine-grained firmware updates without disturbing adjacent code or configuration data. |
| Program Cycle Time | 10 ms per sector - deterministic erase-and-program duration allows predictable system-level update scheduling. |
| Endurance | >10,000 write/erase cycles per sector - sufficient for field firmware upgrades over multi-year product lifecycle. |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated high-voltage programming supply; simplifies power design. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, automotive body electronics, and networking equipment. |
| Standby Current | 300 µA max - enables low-power sleep modes in battery-backed or energy-sensitive applications. |
Pinout & Package
AT29C020-15TI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE compliant, with lead coplanarity ≤0.102 mm and body dimensions 12.45 mm × 14.95 mm × 3.35 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-byte addressing; A0–A7 select byte within sector, A8–A17 select sector. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; supports byte load during programming and true data output during read mode. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state and disables internal logic to minimize standby current. |
| OE | Output Enable | Active-low read control; used with CE to prevent bus contention; must be high during programming operations. |
| WE | Write Enable | Active-low programming control; initiates byte load or sector program cycle; toggling within 150 µs enables sequential sector loading. |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O buffers; internally monitored for hardware write inhibition below 3.8 V. |
| GND | Ground Reference | Signal and power return path; decoupling capacitor required near VCC pin for stable operation. |
| NC | No Connect | Pin 1 (PLCC top view) is unconnected; must remain floating - no external tie or pull-up/down required. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Data Protection | VCC sense, 5 ms power-on delay, noise filtering, and CE/OE/WE state enforcement prevent accidental writes during power transitions or EMI events. |
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h → A0h) required before each sector program - prevents unintended firmware corruption via software bugs. |
| Boot Block Lockout | Independent 8 KB lockout for first and last memory blocks - secures bootloader code against overwrite while allowing application partition updates. |
| DATA Polling & Toggle Bit | I/O7 complement indicates programming progress; I/O6 toggling provides asynchronous status feedback - eliminates need for fixed delays or external timers. |
| Single 5V Operation | No external 12 V or 21 V programming voltage required - reduces BOM count and PCB complexity versus EPROM or older Flash devices. |
| CMOS/TTL Compatibility | VIL = 0.8 V, VIH = 2.0 V, VOL = 0.45 V, VOH = 2.4 V - interoperable with both legacy TTL and modern CMOS microcontrollers without level-shifting. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
|
Use Scenario: Storing firmware and calibration tables in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; serves as primary boot memory accessed at power-on reset with 150 ns read latency. Use Value: Enables remote firmware updates without hardware replacement; boot block lockout protects critical startup routines from accidental overwrite during field upgrades. |
Use Scenario: Holding vehicle-specific configuration data (e.g., door lock logic, lighting profiles) and minor firmware patches in body control units. IC Role / Device Role / Timing Role: Field-upgradable parameter storage; accessed via microcontroller's external memory interface during initialization and runtime configuration reads. Use Value: Supports regional variant management and post-production feature activation; 10,000-cycle endurance accommodates dealer-level recalibration over vehicle lifetime. |
| Legacy Embedded System Upgrade | Network Equipment Bootloader |
|
Use Scenario: Replacing obsolete 27C256 EPROMs in aging medical or test equipment where board layout cannot accommodate new packages. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement; emulates EPROM read behavior while adding in-circuit reprogrammability. Use Value: Eliminates need for UV erasers and socket programmers; 5 V-only operation matches existing power rails; same 32-pin PLCC footprint ensures drop-in replacement. |
Use Scenario: Storing bootloader code in Ethernet switches and routers requiring secure, field-upgradable startup firmware. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; executes initial hardware initialization and loads application image from secondary storage. Use Value: Dual boot blocks allow A/B firmware partitioning; lockout prevents corruption of active bootloader during failover or recovery sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF200A-70-4C-NHE | 3.3 V operation, 70 ns access, 2 MB density, 512-byte sectors, no boot block lockout | Lacks hardware/software write protection and boot block security; requires 3.3 V supply and level shifters for 5 V systems | Select only if migrating to 3.3 V platform; not suitable as direct replacement due to voltage and protection mismatch |
| MX29LV200CTTI-70G | 3.0–3.6 V supply, 70 ns access, 2 MB density, 4×8 KB + 31×64 KB sectors, CFI-compliant | Requires CFI command set; no native 5 V compatibility; different sector map invalidates AT29C020-15TI firmware update logic | Use only in new 3.3 V designs with CFI-aware bootloader; incompatible with AT29C020-15TI's software protection and sector programming flow |
Compared with SST39VF200A-70-4C-NHE and MX29LV200CTTI-70G, the AT29C020-15TI uniquely delivers 5 V-only operation, integrated boot block lockout, and simple three-byte software protection - making it irreplaceable in legacy industrial and automotive systems requiring robust, voltage-compatible Flash with hardware-enforced security.
Availability
AT29C020-15TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, and legacy embedded system upgrades requiring stable component supply, long-term obsolescence mitigation, and guaranteed traceable sourcing.
Supply support for AT29C020-15TI 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 ICs for industrial, automotive, and communications markets.
The AT29C020-15TI belongs to Atmel's legacy 5 V Flash memory product line, designed specifically for drop-in EPROM replacement and in-system firmware update capability in cost-sensitive, temperature-rugged embedded applications.
FAQ
What is the maximum operating temperature range for the AT29C020-15TI?
The AT29C020-15TI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official datasheet (Rev. 0291N–FLASH–07/02), where the "-15TI" suffix explicitly denotes the industrial-grade version. The device maintains full functionality-including 150 ns read access and 10 ms sector programming-across this full range.
Does the AT29C020-15TI require a high-voltage programming supply?
No, the AT29C020-15TI operates with a single 5 V ±10% supply for both read and program operations. Unlike older EPROMs or some early Flash devices, it does not require 12 V or higher programming voltages. All programming commands-including sector erase, byte load, and software protection enable/disable-are executed using standard 5 V logic levels applied to CE, OE, WE, and address/data pins.
How does the boot block lockout feature work on the AT29C020-15TI?
The AT29C020-15TI contains two 8 KB boot blocks-one at the lowest addresses (0x00000–0x01FFF) and one at the highest (0x3E000–0x3FFFF). Each can be independently locked using a seven-command algorithm (AAh/55h/80h/AAh/55h/40h/00h for lower block; FFh for upper block). Once enabled, that block becomes permanently read-only: no erase or program operations are possible, and chip erase is disabled if either block is locked.
Can the AT29C020-15TI be used as a direct replacement for a 27C256 EPROM?
Yes, the AT29C020-15TI is functionally and pinout-compatible with the 27C256 EPROM in read mode: identical 32-pin PLCC package, same A0–A15 and I/O0–I/O7 pin assignments, and matching CE/OE/WE control logic. During read operations, it behaves identically-requiring no changes to existing address decoding or timing. However, programming requires updated firmware to implement sector-based loading and software protection sequences.
What methods are available to detect completion of a program cycle on the AT29C020-15TI?
The AT29C020-15TI provides two hardware-supported methods: DATA polling and Toggle Bit detection. In DATA polling, reading the last loaded byte returns the complement of the data on I/O7 until programming completes; then true data appears. In Toggle Bit mode, I/O6 toggles between 0 and 1 during programming and stabilizes once complete. Both methods eliminate reliance on fixed timing delays and support real-time status monitoring without halting the host processor.
AT29C020-15TI 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29C020-15TI FAQ
1.How can I place an order for AT29C020-15TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-15TI 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 AT29C020-15TI reliable?
The price and inventory of AT29C020-15TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-15TI is usually 5 days.
3.What payment methods are accepted for AT29C020-15TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-15TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-15TI?
AT29C020-15TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-15TI 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 AT29C020-15TI?
For technical support, including AT29C020-15TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-15TI requirements.
6.How does Aetrix verify that AT29C020-15TI is sourced from the original manufacturer or authorized distributors?
All AT29C020-15TI 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 AT29C020-15TI meets industry standards.
7.What is the process for return or replacement of AT29C020-15TI?
All AT29C020-15TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-15TI, 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 AT29C020-15TI part is unused and in its original packaging.
Return procedure for AT29C020-15TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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