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Microchip Technology AT29C020-90TI
- Part No.:
- AT29C020-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-90TI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,288
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Product details
Overview
AT29C020-90TI 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 industrial temperature range (–40°C to +85°C). It supports in-system reprogramming via sector-based architecture with hardware and software data protection.
For engineers reviewing the AT29C020-90TI datasheet, AT29C020-90TI pinout, AT29C020-90TI application, or AT29C020-90TI equivalent, key selection considerations include its 32-pin PLCC package, boot block lockout capability, DATA polling and toggle-bit programming status detection, and compatibility with legacy EPROM-based memory interfaces in industrial control and firmware update systems.
Technical Context
The AT29C020-90TI implements a sector-erase/program architecture with 1024 × 256-byte sectors, internal address/data latches, and autonomous erase-and-program sequencing controlled by an on-chip timer. Its dual-line chip enable (CE) and output enable (OE) logic enables bus contention avoidance during mixed read/write operations.
It integrates both hardware-level protection (VCC sense, noise filtering, CE/OE/WE inhibit) and software-controlled data protection using a three-byte command sequence at fixed addresses (5555H/2AAAH/ A0H), plus independent boot block lockout for two 8K-byte regions - one at 00000H–01FFFH and one at 3E000H–3FFFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8 bits), organized as 256K bytes for direct byte-addressable access |
| Read Access Time | 90 ns max - defines minimum clock-to-data delay in microcontroller or FPGA memory interface timing budgets |
| Sector Program Time | 10 ms typical - determines firmware update latency per 256-byte sector in field-upgrade applications |
| Endurance | >10,000 program/erase cycles per sector - supports long-term logging or configuration storage in industrial equipment |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage; compatible with standard 5V logic rails |
| Operating Temperature | –40°C to +85°C - validated for use in industrial automation, motor drives, and outdoor embedded controllers |
| Standby Current | 100 µA (CMOS) - enables low-power retention mode in battery-backed or energy-constrained systems |
| Interface Compatibility | CMOS and TTL inputs/outputs - ensures interoperability with legacy 8051, Z80, and FPGA-based address/data buses without level-shifting |
Pinout & Package
AT29C020-90TI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE compliant, with 1.27 mm pitch and 11.35–11.51 mm body width. Pin 1 identifier is a beveled corner; leads are gull-wing shaped with 0.102 mm max coplanarity.
| 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 data path for read, byte load, and program operations; high-impedance when CE or OE is inactive |
| CE | Chip Enable | Active-low global device select; must be low for read or program; high forces outputs to high-Z state |
| OE | Output Enable | Active-low read control; used with CE to gate output drivers and prevent bus contention |
| WE | Write Enable | Active-low signal initiating byte load or program cycle; timing-critical for sector programming sequence |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; VCC sense circuitry inhibits programming if below 3.8 V |
| GND | Ground Reference | Common return path for all digital and power currents; decoupling required near VCC pin |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet - no external pull-up/down or routing |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for +12V programming supply - simplifies power design and enables in-circuit updates without hardware modification |
| Boot Block Lockout | Two independent 8K-byte protected regions (low and high address) prevent accidental overwrite of bootloader or safety-critical firmware |
| DATA Polling & Toggle Bit | Dual asynchronous programming status detection methods - allows host processor to poll I/O7 or I/O6 instead of fixed timing delays |
| Hardware + Software Data Protection | VCC sensing, noise filtering, and 3-byte unlock sequence jointly prevent spurious writes during power transients or EMI events |
| Internal Address/Data Latching | 256-byte sector buffer frees address/data bus after initial byte load - enables concurrent host bus activity during internal programming |
| CMOS Standby Current | 100 µA max at VCC = 5 V - reduces system standby power in always-on industrial controllers and remote sensors |
Applications
| Industrial PLC Firmware Storage | Embedded Bootloader Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level reprogrammability; provides deterministic 90 ns read access for real-time scan-cycle execution. Use Value: Enables field-upgradable firmware without replacing EPROMs; boot block lockout prevents corruption of critical startup routines during updates. | Use Scenario: Holding secure bootloader code in medical diagnostic instruments requiring certified firmware integrity and safe recovery paths. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; supports hardware-enforced lockout of first 8K bytes to protect initialization routines. Use Value: Guarantees bootloader immutability across power cycles and firmware updates - critical for FDA-compliant device lifecycle management. |
| Telecom Line Card Configuration | Automotive ECU Calibration Storage |
Use Scenario: Retaining port-specific configuration parameters (e.g., line impedance, gain settings) in DSLAM and optical line terminal modules operating in telecom central offices. IC Role / Device Role / Timing Role: Parameter storage with 10,000-cycle endurance; uses DATA polling to synchronize host CPU with sector programming completion. Use Value: Supports remote reconfiguration without service interruption; low 100 µA standby current minimizes thermal load in densely packed chassis. | Use Scenario: Storing engine calibration maps and emission control parameters in Tier-1 automotive ECUs subjected to wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade nonvolatile memory qualified for –40°C to +85°C operation; sector architecture isolates map updates from base firmware. Use Value: Meets AEC-Q100 stress requirements for reliability; software data protection prevents unintended writes during vehicle cranking transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV200CTTI-90G | 3.3 V core supply (5 V tolerant I/O); 90 ns access; 2 Mbit density; supports CFI query mode | Requires separate 3.3 V rail; lacks boot block lockout; uses different software unlock sequence | Preferred where lower active power and CFI compatibility with modern BIOS/UEFI are required |
| EN29LV200AB-90TIP | 3.3 V only; 90 ns access; 2 Mbit; supports top/bottom boot block configuration but no independent lockout | No 5 V compatibility; boot block size fixed at 16K; no hardware VCC-sense programming inhibit | Used in cost-sensitive consumer electronics where 5 V operation is not needed and simpler protection suffices |
Compared with MX29LV200CTTI-90G and EN29LV200AB-90TIP, the AT29C020-90TI uniquely delivers 5 V-only operation with dual independent boot block lockout and VCC-sense hardware protection - making it irreplaceable in legacy 5 V industrial designs requiring robust, field-upgradable firmware storage.
Availability
AT29C020-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded bootloader memory, telecom line card configuration, and automotive ECU calibration storage requiring stable component supply over extended production lifecycles.
Supply support for AT29C020-90TI 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 security ICs for industrial, automotive, and communications markets.
The AT29C020-90TI belongs to Atmel's legacy parallel Flash memory product line, designed specifically for drop-in replacement of EPROMs in 5 V embedded systems requiring in-system reprogrammability and industrial temperature resilience.
FAQ
What is the maximum operating temperature range for the AT29C020-90TI?
The AT29C020-90TI 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 "TI" suffix explicitly denotes the industrial grade. The device maintains full functionality-including 90 ns read access and 10 ms sector programming-across this entire range.
Does the AT29C020-90TI require a high-voltage programming supply?
No, the AT29C020-90TI operates with single 5 V ±10% supply for both read and program operations. Its "5-volt Only Reprogramming" feature eliminates the need for +12 V or other high-voltage programming supplies. Hardware protection includes VCC sensing that inhibits programming if supply drops below ~3.8 V, ensuring reliable operation under nominal 5 V conditions.
How does the boot block lockout feature work on the AT29C020-90TI?
The AT29C020-90TI contains two independent 8K-byte boot blocks - one at addresses 00000H–01FFFH (lower) and one at 3E000H–3FFFFH (upper). Each can be permanently locked against programming via a seven-command software algorithm. Once enabled, the locked block cannot be erased or written; however, the chip erase function is disabled if either block is locked. Status is readable via software product identification mode.
Can the AT29C020-90TI be used as a direct replacement for standard EPROMs like the 27C020?
Yes, the AT29C020-90TI is pin-compatible and functionally compatible with 27C020 EPROMs in read mode: CE, OE, and WE signals map directly, and I/O pins behave identically during reads. However, programming requires issuing specific unlock sequences and sector-based writes - unlike EPROM UV-erasure - so host firmware must implement Flash-specific algorithms, not just EPROM-style programming.
What packaging options are available for the AT29C020-90TI?
The AT29C020-90TI is supplied exclusively in the 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, identified as "32J" in Atmel's ordering information. This surface-mount package has gull-wing leads, conforms to JEDEC MS-016 variation AE, and measures 11.35–11.51 mm in width. Other variants (e.g., PDIP "32P6", TSOP "32T") exist for different suffixes but are not offered for the -90TI grade.
AT29C020-90TI 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:
- 90 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
AT29C020-90TI FAQ
1.How can I place an order for AT29C020-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-90TI 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 AT29C020-90TI reliable?
The price and inventory of AT29C020-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-90TI is usually 5 days.
3.What payment methods are accepted for AT29C020-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-90TI?
AT29C020-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-90TI 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 AT29C020-90TI?
For technical support, including AT29C020-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-90TI requirements.
6.How does Aetrix verify that AT29C020-90TI is sourced from the original manufacturer or authorized distributors?
All AT29C020-90TI 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 AT29C020-90TI meets industry standards.
7.What is the process for return or replacement of AT29C020-90TI?
All AT29C020-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-90TI, 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 AT29C020-90TI part is unused and in its original packaging.
Return procedure for AT29C020-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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