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Microchip Technology AT29C020-90JU
- Part No.:
- AT29C020-90JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C020-90JU.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,545
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Product details
Overview
AT29C020-90JU from Atmel is a 2-megabit (256K × 8) 5-volt-only Flash memory IC organized as 262,144 bytes, featuring 70 ns read access time, 10 ms sector program cycle time, and hardware/software data protection. It supports in-system reprogramming via sector-based erase-and-program operations with internal latching for 256-byte sectors and is used in embedded boot code storage and firmware update applications.
For engineers reviewing the AT29C020-90JU datasheet, AT29C020-90JU pinout, AT29C020-90JU application, or AT29C020-90JU equivalent, key selection considerations include industrial temperature range (–40°C to +85°C), PLCC-32 packaging, boot block lockout capability, DATA polling and toggle bit for program status detection, and compatibility with standard EPROM read interfaces.
Technical Context
The AT29C020-90JU implements sector-based Flash architecture with 1024 independent 256-byte sectors, enabling selective reprogramming without full-chip erase. Its dual-line chip enable (CE) and output enable (OE) control allows flexible bus arbitration during read operations.
Program execution uses internal timing control with automatic sector erase followed by programming; end-of-cycle detection is supported via I/O7 DATA polling or I/O6 toggle bit behavior. Hardware protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling storage of boot firmware or configuration data in space-constrained systems |
| Read Access Time | 90 ns max - defines maximum latency for instruction fetch or data read in real-time embedded systems |
| Sector Program Time | 10 ms typical - determines minimum time required to update firmware segments without system interruption |
| Supply Voltage | 5 V ±10% - eliminates need for auxiliary voltage rails, simplifying power design in legacy 5V systems |
| Endurance | >10,000 write/erase cycles per sector - supports field-upgradable firmware with long service life |
| Standby Current | 300 µA CMOS - enables low-power retention in battery-backed or energy-sensitive applications |
| Operating Temperature | –40°C to +85°C - validated for industrial-grade reliability in automotive ECUs and industrial controllers |
Pinout & Package
AT29C020-90JU is housed in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package compliant with JEDEC MS-016, Variation AE, with body dimensions 12.57 mm × 15.11 mm × 3.56 mm and lead coplanarity ≤0.102 mm.
| 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 compatible with standard microcontroller data buses; supports byte load and DATA polling on I/O7 |
| CE | Chip Enable | Active-low device selection; when high, places outputs in high-impedance state to prevent bus contention |
| OE | Output Enable | Active-low read control; used with CE to implement dual-line gating for robust read timing |
| WE | Write Enable | Active-low signal initiating byte load and sector programming; must be high during read operations |
| VCC | Power Supply | +5 V ±10% supply input; powers core logic and I/O drivers; internal VCC sense prevents programming below 3.8 V |
| GND | Ground Reference | Primary return path for all digital and I/O currents; decoupling near VCC pin required for stable operation |
| NC | No Connect | Unbonded pin; must remain unconnected to avoid unintended coupling or leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Two 8K-byte Boot Blocks with Independent Lockout | Enables secure storage of bootloader code at 0x00000–0x01FFF and 0x3E000–0x3FFFF; lockout activation prevents accidental overwrite during field updates |
| Hardware + Software Data Protection | VCC sensing, 5 ms power-on delay, and 3-byte command sequence (AAh/55h/A0h) ensure reliable immunity against spurious writes during power transitions or noise events |
| Internal Address/Data Latching for 256 Bytes | Allows full sector data loading before programming begins, freeing address/data bus for concurrent system operations |
| DATA Polling & Toggle Bit Status Detection | I/O7 complements last loaded byte until programming completes; I/O6 toggles during operation - both provide non-intrusive, software-driven program status monitoring |
| Green (Pb/Halide-free) Packaging | Meets RoHS Directive 2011/65/EU requirements; PLCC-32 package contains no lead or halogenated flame retardants |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Code |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and field-upgradable application code with sector-level granularity. Use Value: 10,000-cycle endurance and –40°C to +85°C operation ensure multi-year reliability without recalibration; boot block lockout prevents corruption of critical initialization routines. | Use Scenario: Hosting BIOS-equivalent startup code and hardware initialization routines in legacy 8/16-bit microcontroller-based instrumentation devices. IC Role / Device Role / Timing Role: EPROM-replacement Flash memory delivering 90 ns read access compatible with existing bus timing budgets. Use Value: Pin- and function-compatible upgrade path from UV-erasable EPROMs; no PCB redesign needed while adding in-system reprogrammability. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration Memory |
Use Scenario: Storing calibration parameters, feature-enable flags, and diagnostic event logs in vehicle body control units subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store using software data protection and boot block lockout to safeguard safety-critical settings. Use Value: Hardware VCC-sense and noise-filtered WE/CE inputs prevent unintended writes during engine cranking transients; 300 µA standby current extends battery life in sleep mode. | Use Scenario: Retaining localized language packs, tax rate tables, and merchant-specific settings across power cycles in retail payment terminals deployed globally. IC Role / Device Role / Timing Role: Field-updatable parameter memory supporting over-the-air firmware patches and regional compliance updates. Use Value: Sector-based programming enables partial updates without erasing transaction history; green Pb/halide-free packaging meets EU WEEE and RoHS requirements for consumer-facing equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90JC | 4 Mbit density, 3.0–3.6 V supply, 90 ns access, 32-pin PLCC; lacks boot block lockout and software data protection | Requires external voltage translation for 5 V systems; suitable for higher-density but less secure applications | Select when >2 Mbit capacity is required and 3.3 V operation is acceptable; not drop-in compatible due to voltage and protection differences |
| MX29LV040CTTI-90G | 4 Mbit, 3.0–3.6 V, 90 ns, TSOP-32; includes CFI-compliant command set but no hardware boot block lockout | Designed for modern 3.3 V embedded platforms; incompatible with 5 V-only bus interfaces | Choose for new 3.3 V designs requiring industry-standard CFI interface; requires level-shifting and layout changes for 5 V legacy systems |
Compared with AM29LV040B-90JC and MX29LV040CTTI-90G, the AT29C020-90JU provides native 5 V operation, integrated boot block security, and hardware VCC-sense protection-making it uniquely suited for retrofitting legacy industrial and automotive systems where voltage compatibility and write safety are non-negotiable.
Availability
AT29C020-90JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot code, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AT29C020-90JU 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 U.S.-based semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT29C020-90JU belongs to Atmel's legacy 5V Flash memory product line, designed specifically for seamless replacement of EPROMs in existing 5V systems while adding in-system reprogrammability and enhanced data integrity features.
FAQ
What is the maximum read access time specified for the AT29C020-90JU?
The AT29C020-90JU 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 the "-90" speed grade designation in the part number.
Does the AT29C020-90JU support in-system programming without high-voltage supplies?
Yes, the AT29C020-90JU supports full in-system programming using only a single 5 V ±10% supply - no external high-voltage generator or VPP pin is required. Programming is initiated via standard 5 V logic-level commands (e.g., AAh/55h/A0h sequence), making it compatible with conventional microcontroller GPIO interfaces.
How many sectors does the AT29C020-90JU have, and what is the size of each sector?
The AT29C020-90JU contains 1024 sectors, each consisting of 256 bytes. This sector organization enables granular firmware updates: only modified sectors need reprogramming, minimizing update time and wear on unaffected memory regions. The total memory capacity remains 262,144 bytes (256K × 8).
What protection mechanisms prevent accidental writes to the AT29C020-90JU?
The AT29C020-90JU implements dual-layer protection: hardware safeguards (VCC sense <3.8 V, 5 ms power-on delay, noise filtering on WE/CE) and software data protection (3-byte unlock sequence AAh/55h/A0h). Both must be satisfied before programming - preventing corruption during power-up, brown-out, or EMI events.
Is the AT29C020-90JU RoHS-compliant, and what package type does it use?
Yes, the AT29C020-90JU is RoHS-compliant and offered in a green (Pb/halide-free) 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated by the "JU" suffix. This PLCC-32 variant conforms to JEDEC MS-016, Variation AE, with body dimensions 12.57 mm × 15.11 mm × 3.56 mm.
AT29C020-90JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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-PLCC (13.97x11.43)
AT29C020-90JU FAQ
1.How can I place an order for AT29C020-90JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-90JU 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 AT29C020-90JU reliable?
The price and inventory of AT29C020-90JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-90JU is usually 5 days.
3.What payment methods are accepted for AT29C020-90JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-90JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-90JU?
AT29C020-90JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-90JU 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 AT29C020-90JU?
For technical support, including AT29C020-90JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-90JU requirements.
6.How does Aetrix verify that AT29C020-90JU is sourced from the original manufacturer or authorized distributors?
All AT29C020-90JU 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 AT29C020-90JU meets industry standards.
7.What is the process for return or replacement of AT29C020-90JU?
All AT29C020-90JU units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-90JU, 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 AT29C020-90JU part is unused and in its original packaging.
Return procedure for AT29C020-90JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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