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Microchip Technology AT29C020-90TU-T
- Part No.:
- AT29C020-90TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-90TU-T.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,121
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Product details
Overview
AT29C020-90TU-T from Atmel is a 2-Mbit (256K × 8) 5V-only Flash memory IC used for nonvolatile code and data storage in embedded systems, supporting sector-based reprogramming with 256-byte granularity. It delivers 90 ns read access time, 10 ms sector program cycle time, and operates across the industrial temperature range (−40°C to +85°C) in a 32-lead TSOP package.
For engineers reviewing the AT29C020-90TU-T datasheet, AT29C020-90TU-T pinout, AT29C020-90TU-T application, or AT29C020-90TU-T equivalent, key selection considerations include its 5V-only programming architecture, boot block lockout capability, hardware/software data protection, and compatibility with EPROM-style read interfaces in legacy microcontroller systems.
Technical Context
The AT29C020-90TU-T implements a sector-erase-and-program architecture where each of 1024 sectors (256 bytes each) is internally latched before autonomous erase-and-write execution. Its dual data protection-hardware (VCC sense, noise filtering, CE/OE/WE inhibit) and software (3-byte unlock sequence)-ensures robust immunity to spurious writes during power transitions or noise events.
It supports three primary operational modes: standard EPROM-like read (CE/OE low, WE high), byte-load programming (WE or CE pulse with OE high), and software-controlled product identification or boot block lockout enablement via specific address/data sequences. Toggle Bit (I/O6) and DATA Polling (I/O7) provide real-time program completion detection without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K bytes for direct byte-addressable access |
| Read Access Time | 90 ns max - determines minimum instruction fetch latency in 8-bit microcontroller boot loaders |
| Sector Program Time | 10 ms typical - defines firmware update granularity and worst-case field upgrade duration per 256-byte block |
| Endurance | >10,000 write/erase cycles per sector - supports long-life field firmware updates in industrial controllers |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5V logic systems |
| Standby Current | 300 µA CMOS - enables ultra-low-power retention in battery-backed or energy-constrained applications |
| Operating Temp | −40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure |
| Boot Blocks | Two 8K-byte blocks (0x00000–0x01FFF and 0x3E000–0x3FFFF) with independent lockout - secures bootloader and configuration data against accidental overwrite |
Pinout & Package
AT29C020-90TU-T is housed in a 32-lead Thin Small Outline Package (TSOP, Type 1), JEDEC MO-142 BD compliant, measuring 20.0 mm × 8.0 mm × 1.2 mm (max height). Pin 1 identifier is marked by a beveled corner.
| 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 | CMOS/TTL-compatible 8-bit data path; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-impedance state |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; initiates byte load or program cycle when CE low and OE high |
| VCC | Power Supply | +5 V ±10% supply; internal VCC sense disables programming if below ~3.8 V |
| GND | Ground | Reference for all inputs/outputs; decoupling capacitor required near VCC pin for stable operation |
| NC | No Connect | Pin 16 (TSOP) is unconnected; must remain floating - no external tie required |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for +12V programming supplies - simplifies PCB design and reduces BOM count in 5V-only systems |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and 15 ns noise filter prevent unintended writes during brown-out or EMI events |
| Software Data Protection | Three-byte unlock sequence (AAh/55h/A0h) required before each sector program - prevents accidental firmware corruption |
| Boot Block Lockout | Independent 8K-byte lockout for upper/lower memory regions - secures bootloader and calibration data permanently after initial programming |
| DATA Polling & Toggle Bit | Real-time program status via I/O7 complement or I/O6 toggling - removes dependency on fixed timing delays in host firmware |
| Green Packaging | Pb/halide-free TSOP - meets RoHS Directive 2011/65/EU and facilitates compliance in export-oriented industrial designs |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage device providing EPROM-compatible read interface and in-system reprogrammability via RS-232 or CAN-based field update protocols. Use Value: 10,000-cycle endurance and −40°C to +85°C operation ensure reliable firmware retention over 10+ years in uncontrolled cabinet environments. | Use Scenario: Hosting boot code for 8051, Z80, or 68K-based embedded controllers where space-constrained PCBs require compact, drop-in EPROM replacement. IC Role / Device Role / Timing Role: Direct hardware replacement for 27C256 EPROMs, using identical pinout and read timing while enabling field-upgradable firmware. Use Value: 90 ns read access matches legacy EPROM timing budgets; sector programming avoids full-chip erase delays during incremental updates. |
| Telecom Line Card Configuration | Medical Device Calibration Storage |
Use Scenario: Storing port mapping tables, protocol stacks, and hardware configuration data on modular telecom line cards requiring hot-swap capability and zero-downtime updates. IC Role / Device Role / Timing Role: Configurable nonvolatile memory accessed via parallel bus; boot block lockout protects critical initialization routines during card insertion/removal. Use Value: Hardware data protection prevents corruption during power sequencing transients; 300 µA standby current minimizes idle power draw across multi-slot chassis. | Use Scenario: Retaining calibrated sensor offsets, gain coefficients, and safety-critical operational limits in portable diagnostic equipment subject to strict regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure parameter storage with dual protection: boot block lockout prevents runtime modification, software protection enforces authenticated update procedures. Use Value: Independent lockout of two 8K-byte regions allows separation of FDA-mandated calibration data from user-configurable settings - simplifying audit trails and version control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90JD | 4 Mbit density, 3.0–3.6 V supply, requires VPP = 12 V for programming | Not pin-compatible; requires voltage translation and separate programming rail | Choose only if higher density and 3.3 V system integration outweigh redesign effort |
| MX29LV040CTTI-90G | 4 Mbit, 3.0–3.6 V core, 5 V I/O tolerant, no boot block lockout | Lacks hardware-enforced boot region protection; relies solely on software locking | Select when migrating to 3.3 V platforms but verify bootloader integrity via firmware-level checks |
Compared with AM29LV040B-90JD and MX29LV040CTTI-90G, the AT29C020-90TU-T provides native 5 V operation, built-in boot block lockout, and simpler power architecture - making it optimal for cost-sensitive, legacy 5 V embedded systems requiring field-upgradable firmware with hardware-level security.
Availability
AT29C020-90TU-T is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot systems, telecom line cards, medical calibration storage, and embedded instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for AT29C020-90TU-T 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 for industrial, automotive, and consumer applications.
The AT29C020-90TU-T belongs to Atmel's legacy parallel Flash memory product line, designed specifically for 5 V embedded systems needing EPROM drop-in replacement with in-system reprogrammability and hardware-enforced data protection.
FAQ
What is the maximum read access time specified for the AT29C020-90TU-T?
The AT29C020-90TU-T has a maximum read access time of 90 ns, measured from address valid to valid data on I/O0–I/O7 under industrial temperature conditions (−40°C to +85°C) and VCC = 5 V ±10%. This value is guaranteed across the full operating range and aligns with legacy EPROM timing for seamless replacement in existing 8-bit microcontroller designs.
Does the AT29C020-90TU-T support in-system programming without high-voltage supplies?
Yes, the AT29C020-90TU-T supports full in-system programming using only a single 5 V ±10% supply - no external VPP or high-voltage programming rails are required. Programming is initiated via standard WE/CE/OE control signals and validated 3-byte unlock sequences, enabling field firmware updates directly through the host processor's parallel bus.
How does hardware data protection work on the AT29C020-90TU-T?
Hardware data protection on the AT29C020-90TU-T includes four mechanisms: (1) VCC sense circuitry inhibits programming if supply drops below ~3.8 V; (2) automatic 5 ms power-on delay before enabling writes; (3) program inhibition when OE is low, CE is high, or WE is high; and (4) 15 ns noise filter rejecting spurious pulses on WE/CE. These operate independently of software control.
Can the boot blocks on the AT29C020-90TU-T be independently locked?
Yes, the AT29C020-90TU-T features two independent 8K-byte boot blocks - one at addresses 0x00000–0x01FFF (lower) and another at 0x3E000–0x3FFFF (upper) - each with separately activatable lockout. Once enabled via the documented 7-command algorithm, that block becomes permanently read-only; chip erase is disabled if either block is locked.
What packaging type is used for the AT29C020-90TU-T?
The AT29C020-90TU-T uses a 32-lead Thin Small Outline Package (TSOP, Type 1), designated as "32T" in Atmel's ordering nomenclature. It conforms to JEDEC MO-142 BD, measures 20.0 mm × 8.0 mm, and features Pb/halide-free construction compliant with RoHS Directive 2011/65/EU.
AT29C020-90TU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
AT29C020-90TU-T FAQ
1.How can I place an order for AT29C020-90TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-90TU-T 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 AT29C020-90TU-T reliable?
The price and inventory of AT29C020-90TU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-90TU-T is usually 5 days.
3.What payment methods are accepted for AT29C020-90TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-90TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-90TU-T?
AT29C020-90TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-90TU-T 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 AT29C020-90TU-T?
For technical support, including AT29C020-90TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-90TU-T requirements.
6.How does Aetrix verify that AT29C020-90TU-T is sourced from the original manufacturer or authorized distributors?
All AT29C020-90TU-T 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 AT29C020-90TU-T meets industry standards.
7.What is the process for return or replacement of AT29C020-90TU-T?
All AT29C020-90TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-90TU-T, 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 AT29C020-90TU-T part is unused and in its original packaging.
Return procedure for AT29C020-90TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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