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Microchip Technology AT29C020-12JC
- Part No.:
- AT29C020-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C020-12JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT29C020-12JC 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 for firmware storage and boot code retention in embedded microcontroller systems.
For engineers reviewing the AT29C020-12JC datasheet, AT29C020-12JC pinout, AT29C020-12JC application, or AT29C020-12JC equivalent, key selection considerations include its PLCC-32 package, sector-based reprogramming without high-voltage support, DATA polling and toggle-bit status detection, hardware/software data protection, and compatibility with standard EPROM read interfaces in legacy industrial controllers and BIOS modules.
Technical Context
The AT29C020-12JC implements a sector-erase architecture with 1024 × 256-byte sectors, where each sector must be fully loaded before internal auto-erase-and-program execution. It uses CMOS-compatible TTL-level inputs/outputs and supports both WE-controlled and CE-controlled byte loading with 150 µs inter-byte timing constraints.
Its operation relies on dual-line chip enable (CE) and output enable (OE) control to prevent bus contention during reads, and integrates VCC sense, power-on delay, noise filtering, and software command sequences (e.g., 5555h/2AAAh/A0h) for data protection activation - all operating from a single 5V ±10% supply across commercial temperature range (0°C to +70°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full BIOS or bootloader image storage in compact footprint |
| Read Access Time | 120 ns max (tACC), compatible with 8 MHz Z80 or 68K bus timing without wait states |
| Sector Program Time | 10 ms typical, allowing rapid field updates of firmware segments without full-chip erase |
| Endurance | >10,000 write/erase cycles per sector, supporting long-term field maintenance in industrial PLCs |
| Supply Voltage | 5V ±10%, eliminating need for dedicated programming voltage rails or charge pumps |
| Standby Current | 100 µA (CMOS), minimizing quiescent power in battery-backed or low-power embedded systems |
| Operating Temp | 0°C to +70°C, validated for commercial-grade instrumentation and PC peripheral applications |
| Package | 32-lead PLCC (32J), offering robust thermal/mechanical performance and socket compatibility |
Pinout & Package
AT29C020-12JC is housed in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32, package code 32J), measuring 12.5 mm × 12.5 mm × 3.5 mm, with gull-wing leads and pin 1 identifier marked by corner notch. The package complies with JEDEC MS-016, Variation AE, and supports reflow and wave soldering.
| 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 define sector address |
| CE | Chip Enable | Active-low global device select; when high, places outputs in high-impedance state and inhibits programming |
| OE | Output Enable | Active-low read control; used with CE for bus contention management during memory reads |
| WE | Write Enable | Active-low signal initiating byte load or sector program; combined with CE/OE to determine operation mode |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for read, program, and status polling (I/O7 = DATA polling bit, I/O6 = toggle bit) |
| VCC | Power Supply | +5V ±10% main supply; powers core logic and I/O buffers; enables hardware data protection via VCC sense |
| GND | Ground Reference | Signal and power return; required for stable read/write margins and noise immunity |
| NC | No Connect | Unbonded pin (pin 1 and pin 32 in PLCC); must remain unconnected to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for 12V programming supplies or external voltage translators in system-level design |
| Dual Boot Block Lockout | Independent 8K-byte lockout for lower (0x00000–0x01FFF) and upper (0x3E000–0x3FFFF) regions prevents accidental overwrite of critical startup code |
| DATA Polling & Toggle Bit | Real-time program completion detection via I/O7 complement or I/O6 toggling - no external timers or interrupts required |
| Hardware + Software Protection | VCC sense, 5 ms power-on delay, and 3-byte unlock sequence (5555h/2AAAh/A0h) jointly prevent inadvertent writes during brown-out or noise events |
| Internal Address/Data Latches | 256-byte sector buffer allows host CPU to release address/data bus after loading, improving system concurrency |
| CMOS/TTL I/O Compatibility | Supports direct interface with both microcontrollers (e.g., 8051) and legacy logic families without level-shifting |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Module |
|---|---|
Use Scenario: Storing ladder logic programs and configuration parameters in programmable logic controllers subject to frequent field updates. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level reprogrammability and boot block lockout to preserve runtime-critical initialization routines. Use Value: Enables in-system firmware upgrades without removing the module; 10,000-cycle endurance ensures >10-year service life under quarterly update schedules. | Use Scenario: Holding POST routines and hardware initialization code in desktop motherboards using ISA or LPC bus interfaces. IC Role / Device Role / Timing Role: EPROM-replacement boot memory with 120 ns access time matching original BIOS timing requirements. Use Value: Maintains backward compatibility with legacy chipset timing while adding field-upgradable capability via standard programmer commands. |
| Embedded Controller Bootloader | Medical Device Configuration Memory |
Use Scenario: Hosting secure bootloader code that validates and loads application firmware from external media in safety-critical devices. IC Role / Device Role / Timing Role: Protected boot memory with independent lockout of first 8K bytes to prevent corruption of cryptographic verification routines. Use Value: Ensures immutable root-of-trust execution path; software protection sequence prevents unauthorized firmware injection during service operations. | Use Scenario: Retaining calibration coefficients, device serial numbers, and regulatory compliance settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power, high-reliability nonvolatile parameter store interfaced to 8-bit microcontrollers via parallel bus. Use Value: 100 µA standby current extends battery life in handheld units; sector granularity allows selective reprogramming of calibration data without disturbing operational firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29F020-120EC | 40 ns faster read (80 ns vs. 120 ns), but requires 12V VPP for programming and lacks boot block lockout | Used in high-speed embedded systems where programming occurs off-board; unsuitable for in-system reprogramming without HV circuitry | Select only if board already includes 12V programming rail and boot protection is managed externally |
| MX29F020-12PC | Same 120 ns access, identical PLCC-32 package, but offers 100,000-cycle endurance and no software data protection | Preferred for cost-sensitive consumer electronics where firmware rarely changes and security is not mandated | Choose when higher endurance is needed and software lockout is unnecessary; verify timing compatibility with existing OE/CE control logic |
Compared with AM29F020-120EC and MX29F020-12PC, the AT29C020-12JC uniquely combines 5V-only operation, dual boot block lockout, and integrated software/hardware data protection - making it the only option among the three suitable for secure, in-system firmware updates in commercial-temperature industrial controllers without HV support.
Availability
AT29C020-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and embedded controller bootloaders requiring stable component supply, long-lifecycle support, and verified PLCC-32 packaging.
Supply support for AT29C020-12JC 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 RF solutions for embedded applications.
The AT29C020-12JC belongs to Atmel's legacy parallel Flash memory product line, designed specifically for EPROM replacement in 8-bit and 16-bit microprocessor systems requiring in-system reprogrammability without high-voltage circuitry.
FAQ
What is the maximum read access time specified for the AT29C020-12JC?
The AT29C020-12JC has a maximum read access time (tACC) of 120 ns, as indicated by the "-12" suffix in its part number. This value is guaranteed over the commercial temperature range (0°C to +70°C) and applies to the PLCC-32 package variant. It ensures compatibility with microprocessors such as the Intel 80286 or Motorola 68000 running at up to 8 MHz without wait-state insertion.
Does the AT29C020-12JC require high-voltage programming signals?
No, the AT29C020-12JC does not require high-voltage programming signals. It operates exclusively from a single 5V ±10% supply for both read and program operations. Programming is enabled through standard 5V-level command sequences (e.g., 5555h/2AAAh/A0h), eliminating the need for external 12V VPP generators or charge pumps - a key differentiator from earlier EPROM or UV-erasable Flash devices.
How many sectors does the AT29C020-12JC contain, and what is the size of each sector?
The AT29C020-12JC contains 1024 sectors, each sized at 256 bytes. This sector organization enables granular firmware updates: only the modified sector needs reprogramming, reducing update time and wear on unrelated memory regions. The sector address is defined by A8–A17, while A0–A7 select the byte within the sector during loading.
What is the purpose of the two boot blocks in the AT29C020-12JC?
The AT29C020-12JC features two independent 8K-byte boot blocks - one at the lowest address range (0x00000–0x01FFF) and one at the highest (0x3E000–0x3FFFF). Each can be individually locked to prevent accidental erasure or programming, safeguarding critical boot code in systems that boot from either end of memory space - essential for reliable recovery in industrial and medical devices.
Can the AT29C020-12JC be used in place of an EPROM like the 27C256?
Yes, the AT29C020-12JC is pin-compatible and functionally compatible with 27C256 EPROMs in read mode: CE, OE, and WE behave identically, and I/O0–I/O7 provide standard TTL/CMOS-compatible outputs. However, unlike the 27C256, the AT29C020-12JC supports in-system reprogramming via 5V-only commands and includes hardware/software data protection - requiring minor firmware adaptation but no PCB change.
What status detection methods does the AT29C020-12JC support during programming?
The AT29C020-12JC supports two real-time program completion detection methods: DATA polling (monitoring complement-to-data on I/O7) and the Toggle Bit method (observing I/O6 toggling between 0 and 1). Both can be initiated at any point during the 10 ms sector program cycle and eliminate the need for fixed-delay timing loops or external status lines - simplifying host controller firmware design.
AT29C020-12JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29C020-12JC FAQ
1.How can I place an order for AT29C020-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-12JC 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 AT29C020-12JC reliable?
The price and inventory of AT29C020-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-12JC is usually 5 days.
3.What payment methods are accepted for AT29C020-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-12JC?
AT29C020-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-12JC 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 AT29C020-12JC?
For technical support, including AT29C020-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-12JC requirements.
6.How does Aetrix verify that AT29C020-12JC is sourced from the original manufacturer or authorized distributors?
All AT29C020-12JC 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 AT29C020-12JC meets industry standards.
7.What is the process for return or replacement of AT29C020-12JC?
All AT29C020-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-12JC, 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 AT29C020-12JC part is unused and in its original packaging.
Return procedure for AT29C020-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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