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Microchip Technology AT29C020-10JI
- Part No.:
- AT29C020-10JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C020-10JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,134
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Product details
Overview
AT29C020-10JI from Atmel is a 2-megabit (256K × 8) 5V-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.
For engineers reviewing the AT29C020-10JI datasheet, AT29C020-10JI pinout, AT29C020-10JI application, or AT29C020-10JI equivalent, key selection considerations include sector-based reprogramming, hardware/software data protection, boot block lockout capability, and PLCC-32 packaging for legacy industrial control and firmware update applications.
Technical Context
The AT29C020-10JI implements a sector-erase architecture with 1024 independent 256-byte sectors, enabling selective firmware updates without full chip erasure. Its internal address/data latches and automatic erase-then-program sequence eliminate external timing control during programming.
It supports dual data validation methods-DATA polling on I/O7 and TOGGLE BIT on I/O6-for reliable end-of-program detection. Hardware protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering (<15 ns pulses ignored), while software protection uses a 3-byte command sequence at fixed addresses (5555H/2AAAH/ A0H).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K bytes for direct byte-addressable firmware storage |
| Read Access Time | 100 ns max - ensures compatibility with 10 MHz bus timing in legacy microcontroller systems |
| Sector Program Time | 10 ms typical - enables rapid field updates of 256-byte firmware segments without system downtime |
| Endurance | >10,000 program/erase cycles per sector - supports long-term field maintenance in industrial controllers |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated high-voltage programming supplies in-system |
| Operating Temperature | –40°C to +85°C - qualified for deployment in uncontrolled industrial environments |
| Standby Current | 300 µA max - reduces power budget impact during idle states in battery-backed systems |
Pinout & Package
AT29C020-10JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with industry-standard 32J footprint. The package provides robust thermal and mechanical performance for through-hole mounting in industrial PCBs.
| 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 with OE low and WE high for read access; inhibits programming when high |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high to prevent bus contention |
| WE | Write Enable | Active-low write control; initiates byte load or sector program; must be high during read operations |
| NC | No Connect | Pin 1 and Pin 32 are unconnected; no internal bonding - must remain floating or grounded per layout guidelines |
| VCC | Power Supply | +5 V ±10% supply input; requires local 0.1 µF ceramic decoupling adjacent to pin |
| GND | Ground | Signal and power reference plane; multiple ground pins (Pins 16, 17) reduce noise coupling in high-speed reads |
Key Features
| Feature | Design Value |
|---|---|
| Two 8K-byte Boot Blocks with Independent Lockout | Enables secure storage of bootloader code in first/last 8K bytes; lockout prevents accidental overwrite during field firmware updates |
| Hardware + Software Data Protection | VCC sensing, 5 ms power-on delay, and 3-byte unlock sequence (5555H/2AAAH/A0H) jointly prevent spurious writes during brown-out or noise events |
| Internal Address/Data Latching | Allows full 256-byte sector data to be loaded before initiating erase+program, freeing address/data bus for concurrent CPU operations |
| DATA Polling & TOGGLE BIT | Dual asynchronous status reporting via I/O7 complement-read and I/O6 toggle eliminates need for fixed timing delays in host firmware |
| Single 5V Supply Operation | Removes requirement for +12 V programming voltage, simplifying power design and enabling true in-system reprogramming |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Code |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level update capability; retains firmware during power loss and supports remote patching via serial interface. Use Value: Enables field-upgradable control logic without replacing hardware; boot block lockout protects critical startup routines from corruption during update. | Use Scenario: Holding boot ROM and BIOS initialization code in older x86-based industrial PCs and human-machine interface (HMI) terminals. IC Role / Device Role / Timing Role: EPROM-replacement Flash memory mapped into CPU address space; 100 ns access meets timing requirements of 80386/80486-based designs. Use Value: Eliminates UV-erasing and socket programming; allows in-circuit firmware recovery after failed updates using standard parallel bus protocols. |
| Telecom Line Card Configuration | Medical Device Calibration Data |
Use Scenario: Storing DSP configuration tables and line-provisioning parameters in TDM-based telecom access equipment operating in temperature-variable cabinets. IC Role / Device Role / Timing Role: Parameter storage device accessed during power-up initialization; sector programming allows per-line calibration updates without disrupting active channels. Use Value: Industrial temperature rating (–40°C to +85°C) ensures reliability in unheated outdoor cabinets; hardware data protection prevents misconfiguration during power cycling. | Use Scenario: Retaining sensor calibration coefficients and safety-critical operational limits in portable diagnostic instruments requiring traceable firmware revision history. IC Role / Device Role / Timing Role: Secure nonvolatile parameter store; boot block lockout isolates FDA-approved calibration constants from user-modifiable runtime settings. Use Value: >10,000 endurance cycles support multi-year recalibration schedules; software data protection prevents unauthorized modification during service mode access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020B-120EC | 3.3 V core with 5 V I/O tolerance; 120 ns read access; 100 µA standby current | Requires level-shifting for pure 5 V systems; lower power but slower timing than AT29C020-10JI | Select for new 3.3 V designs needing lower power; not drop-in compatible due to voltage and timing mismatch |
| MX29LV200CTTI-90G | 3.3 V only; 90 ns access; 20 µA standby; supports CFI query mode | Not 5 V compatible; lacks hardware VCC-sense protection; requires different initialization sequence | Choose for cost-sensitive 3.3 V applications with CFI-based auto-detection; unsuitable for legacy 5 V buses |
Compared with AM29LV020B-120EC and MX29LV200CTTI-90G, the AT29C020-10JI uniquely delivers true 5 V-only operation with industrial temperature support, boot block lockout, and hardware/software dual protection-making it the only viable option for maintaining legacy 5 V embedded systems requiring field firmware security and reliability.
Availability
AT29C020-10JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot code, and telecom line card configuration requiring stable component supply and long-lifecycle support.
Supply support for AT29C020-10JI 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.
The AT29C020-10JI belongs to Atmel's legacy 5V Flash memory product line, designed specifically for drop-in EPROM replacement in industrial, telecom, and medical systems requiring in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum read access time specified for the AT29C020-10JI?
The AT29C020-10JI has a maximum read access time of 100 ns, as confirmed by its -10 speed grade designation and AC Read Characteristics table. This timing applies across the full industrial temperature range (–40°C to +85°C) and ensures compatibility with 10 MHz microcontroller buses. The value reflects the worst-case propagation delay from address valid to valid data on I/O0–I/O7 under VCC = 5 V ±10% conditions.
Does the AT29C020-10JI support in-system programming without external high-voltage supplies?
Yes, the AT29C020-10JI supports full in-system programming using only a single 5 V ±10% supply - no external +12 V or other high-voltage sources are required. Programming is initiated via standard 5 V logic-level commands (e.g., 5555H/2AAAH/A0H sequence), and internal circuitry handles erase-and-program sequencing automatically. This capability is explicitly documented in the "5-volt Only Reprogramming" feature and Device Operation section of the AT29C020-10JI datasheet.
How many sectors does the AT29C020-10JI have, and what is the size of each sector?
The AT29C020-10JI contains 1024 independent sectors, each 256 bytes in size. This sector organization is confirmed in the Features section and supported by the sector programming description: A8–A17 select the sector address (10 bits = 1024 sectors), and A0–A7 select the byte within the sector. Sector-based erasure enables targeted firmware updates without affecting unrelated memory regions.
What protection mechanisms prevent accidental programming of the AT29C020-10JI?
The AT29C020-10JI implements dual protection: hardware protection includes VCC sensing (<3.8 V disables programming), 5 ms power-on delay, and noise filtering (<15 ns pulses ignored); software protection requires a 3-byte unlock sequence (5555H/2AAAH/A0H) before any sector program. Both mechanisms are active simultaneously - if either fails, programming is inhibited. These are detailed in the Hardware and Software Data Protection sections of the AT29C020-10JI datasheet.
Is the AT29C020-10JI pin-compatible with other packages of the same part number?
Yes, the AT29C020-10JI (PLCC-32) shares identical pinout and signal mapping with AT29C020-10JC (PDIP-32) and AT29C020-10TI (TSOP-32), as confirmed by the Pin Configurations section showing identical A0–A17, I/O0–I/O7, CE, OE, WE, VCC, GND, and NC assignments across all three packages. This allows direct PCB footprint substitution between PLCC, PDIP, and TSOP variants without schematic or layout changes.
AT29C020-10JI 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:
- 100 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)
AT29C020-10JI FAQ
1.How can I place an order for AT29C020-10JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-10JI 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 AT29C020-10JI reliable?
The price and inventory of AT29C020-10JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-10JI is usually 5 days.
3.What payment methods are accepted for AT29C020-10JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-10JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-10JI?
AT29C020-10JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-10JI 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 AT29C020-10JI?
For technical support, including AT29C020-10JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-10JI requirements.
6.How does Aetrix verify that AT29C020-10JI is sourced from the original manufacturer or authorized distributors?
All AT29C020-10JI 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 AT29C020-10JI meets industry standards.
7.What is the process for return or replacement of AT29C020-10JI?
All AT29C020-10JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-10JI, 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 AT29C020-10JI part is unused and in its original packaging.
Return procedure for AT29C020-10JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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