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Microchip Technology AT29C020-12JI
- Part No.:
- AT29C020-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C020-12JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,496
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Product details
Overview
AT29C020-12JI 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, 10,000 write/erase endurance, and dual 8K-byte boot blocks with independent programming lockout - used in embedded system firmware storage and BIOS code retention.
For engineers reviewing the AT29C020-12JI datasheet, AT29C020-12JI pinout, AT29C020-12JI application, or AT29C020-12JI equivalent, key selection considerations include industrial temperature operation (−40°C to +85°C), sector-based reprogramming without high-voltage support, DATA polling and TOGGLE BIT for program completion detection, and hardware/software data protection for secure firmware updates.
Technical Context
The AT29C020-12JI implements sector-erase-and-program architecture with 1024 sectors of 256 bytes each; internal address/data latches enable full-sector loading before autonomous erase-and-write execution. Its control logic responds to CE/OE/WE timing per JEDEC-compliant Flash protocols.
It supports three distinct operational modes: standard EPROM-like read (CE↓, OE↓, WE↑), byte-load programming initiation (CE↓/WE↓ with OE↑), and software-controlled protection via 3-byte command sequences at fixed addresses (5555H/2AAAH/5555H). Boot block lockout uses a 7-command enable algorithm targeting addresses 00000H and 3FFFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full BIOS or bootloader storage in single-package footprint |
| Read Access Time | 120 ns max (tACC), compatible with 8 MHz bus timing in legacy x86 and microcontroller systems |
| Sector Program Time | 10 ms typical, allowing rapid field firmware patching without external high-voltage circuitry |
| Endurance | >10,000 program/erase cycles per sector, supporting long-life industrial firmware update cycles |
| Supply Voltage | 5 V ±10%, eliminating need for dedicated VPP programming voltage rails |
| Operating Temperature | −40°C to +85°C, qualified for industrial control, automotive body electronics, and telecom infrastructure |
| Standby Current | 300 µA max (ISB1), minimizing power in always-on embedded systems during idle states |
Pinout & Package
AT29C020-12JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variant AE, with 1.27 mm pitch, 12.45 mm × 14.95 mm body, and lead coplanarity ≤0.102 mm - suitable for surface-mount reflow and socketed prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 262,144-byte addressing; A8–A17 select sector, A0–A7 select byte within sector |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high disables outputs and inhibits programming |
| OE | Output Enable | Active-low output control; enables data bus drivers during read; must be high during programming |
| WE | Write Enable | Active-low write strobe; initiates byte load or sector program; low pulse width ≥90 ns required |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; carries address latch commands, program data, and read outputs |
| NC | No Connect | Pin 1 (PLCC top view) is unconnected; no internal bonding - must remain floating |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; decoupling capacitor required near pin |
| GND | Ground Reference | Signal and power ground reference; separate return path recommended for noise-sensitive applications |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for +12 V VPP programming supply, simplifying PCB layout and power design |
| Hardware Data Protection | VCC sense (disable below 3.8 V), 5 ms power-on delay, and noise filtering (<15 ns pulses rejected) prevent spurious writes |
| Software Data Protection | Three-command sequence (5555H/2AAAH/5555H) enables/disables write access - persistent across power cycles |
| Boot Block Lockout | Two independent 8 KB regions (0x00000–0x01FFF and 0x3E000–0x3FFFF) can be permanently write-locked for secure boot code |
| DATA Polling & TOGGLE BIT | I/O7 complement detection and I/O6 toggling provide real-time, bus-compatible program completion signaling without status registers |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Retention |
|---|---|
Use Scenario: Storing configuration logic and motion control algorithms in programmable logic controllers operating in factory-floor environments with wide thermal swings. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level update capability; reads executed at system boot and during runtime diagnostics. Use Value: 10,000-cycle endurance and −40°C to +85°C rating ensure reliable operation over 10+ years in uncontrolled industrial enclosures. | Use Scenario: Holding BIOS code in desktop motherboards and embedded x86 platforms where compatibility with legacy EPROM interfaces is mandatory. IC Role / Device Role / Timing Role: Drop-in Flash replacement for 27C020 EPROMs; emulates EPROM read timing while enabling in-system firmware upgrades. Use Value: 120 ns tACC and CMOS/TTL I/O compatibility allow direct substitution without timing redesign or level-shifting circuitry. |
| Telecom Line Card Bootloader | Medical Device Configuration Memory |
Use Scenario: Storing bootloaders and FPGA configuration bitstreams on carrier-grade line cards requiring field-upgradable firmware with tamper resistance. IC Role / Device Role / Timing Role: Secure boot memory with independently lockable upper/lower 8 KB blocks; software protection prevents unauthorized firmware modification. Use Value: Boot block lockout and 3-byte software protection enable HIPAA/FDA-aligned secure boot verification without external crypto ICs. | Use Scenario: Retaining calibration data, device serial numbers, and safety-critical configuration parameters in Class II medical instruments with strict traceability requirements. IC Role / Device Role / Timing Role: Low-power nonvolatile parameter store; accessed only during power-up and service mode; standby current ≤300 µA extends battery backup life. Use Value: 300 µA industrial-grade standby current and 10,000-cycle endurance support 15-year product lifecycle with quarterly calibration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020-120EC | 4.5–5.5 V supply; 120 ns tACC; 100,000-cycle endurance; requires VPP = 12 V for program/erase | Higher endurance but needs external high-voltage generator; not 5V-only compatible | Select when longer lifetime justifies added board complexity and cost of VPP circuitry |
| MX29LV020C-12P | 3.0–3.6 V core supply; 120 ns tACC; 100,000-cycle endurance; 3.3 V I/O tolerant | Lower voltage operation incompatible with 5 V bus systems; requires level translation for legacy designs | Select only for new 3.3 V designs; not suitable as drop-in replacement for AT29C020-12JI |
Compared with AM29LV020-120EC and MX29LV020C-12P, the AT29C020-12JI uniquely delivers true 5V-only operation with industrial temperature range and boot block security - making it the sole option for legacy 5 V systems requiring simple, robust, and secure firmware storage without voltage translation or high-voltage generation.
Availability
AT29C020-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS retention, and telecom line card bootloader applications requiring stable component supply across extended production lifecycles.
Supply support for AT29C020-12JI 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, Flash memory, and secure authentication ICs, headquartered in San Jose, CA.
The AT29C020-12JI belongs to Atmel's legacy parallel-interface Flash memory product line, designed specifically for 5 V embedded systems requiring in-system reprogrammability without high-voltage support - targeting BIOS, firmware, and boot code storage in industrial and computing applications.
FAQ
What is the maximum operating temperature range for the AT29C020-12JI?
The AT29C020-12JI 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 Atmel datasheet (Rev. 0291N), where the "I" suffix denotes industrial grade. The device maintains full functionality-including 120 ns read access and 10 ms sector programming-across this full range without derating.
Does the AT29C020-12JI require a high-voltage programming supply?
No, the AT29C020-12JI operates with a single 5 V ±10% supply for both read and program operations. Unlike earlier EPROMs or some competing Flash devices, it does not require a +12 V VPP pin. All programming commands are issued using standard 5 V logic levels, as verified in the "Features" section and "Device Operation" chapter of the datasheet.
How many sectors does the AT29C020-12JI have, and what is the size of each sector?
The AT29C020-12JI contains 1024 sectors, each 256 bytes in size. This is explicitly stated in the "Features" list and confirmed in the "Device Operation" section under "PROGRAM", which specifies that A8–A17 define the sector address and A0–A7 define the byte offset within the sector. Total memory (262,144 bytes) divided by 256 equals exactly 1024 sectors.
Can the boot blocks of the AT29C020-12JI be unlocked after programming lockout is enabled?
No - once the boot block programming lockout feature is activated on either the lower (0x00000–0x01FFF) or upper (0x3E000–0x3FFFF) 8 KB block, it is permanent and irreversible. The datasheet states: "Once the programming lockout feature has been activated, the data in that block can no longer be erased or programmed." There is no documented unlock command or hardware reset mechanism for this feature in the AT29C020-12JI specification.
What methods does the AT29C020-12JI provide to detect the end of a program cycle?
The AT29C020-12JI provides two hardware-supported methods: DATA polling (monitoring complement state on I/O7) and TOGGLE BIT (observing oscillation on I/O6). Both are defined in the "DATA POLLING" and "TOGGLE BIT" sections of the datasheet. Either method may be used at any time during the 10 ms program cycle; no status register or external controller is required.
AT29C020-12JI 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:
- 120 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)
AT29C020-12JI FAQ
1.How can I place an order for AT29C020-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-12JI 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 AT29C020-12JI reliable?
The price and inventory of AT29C020-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-12JI is usually 5 days.
3.What payment methods are accepted for AT29C020-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-12JI?
AT29C020-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-12JI 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 AT29C020-12JI?
For technical support, including AT29C020-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-12JI requirements.
6.How does Aetrix verify that AT29C020-12JI is sourced from the original manufacturer or authorized distributors?
All AT29C020-12JI 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 AT29C020-12JI meets industry standards.
7.What is the process for return or replacement of AT29C020-12JI?
All AT29C020-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-12JI, 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 AT29C020-12JI part is unused and in its original packaging.
Return procedure for AT29C020-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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