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Microchip Technology AT29C020-15JC
- Part No.:
- AT29C020-15JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C020-15JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
AT29C020-15JC 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, BIOS/UEFI code retention, and industrial controller boot memory.
For engineers reviewing the AT29C020-15JC datasheet, AT29C020-15JC pinout, AT29C020-15JC application, or AT29C020-15JC equivalent, key selection considerations include its PLCC-32 package, sector-based reprogramming without high-voltage inputs, DATA polling and toggle-bit program completion detection, hardware/software data protection, and compatibility with standard EPROM read interfaces.
Technical Context
The AT29C020-15JC implements sector-erase-and-program architecture with 1024 × 256-byte sectors, internal address/data latches for full-sector buffering, and autonomous internal timer-controlled erase-and-write sequencing. It supports byte-load programming via WE or CE pulse control with strict 150 µs inter-byte timing.
Its dual boot-block lockout enables secure firmware partitioning: lower 8K (0x00000–0x01FFF) and upper 8K (0x3E000–0x3FFFF) blocks can be independently locked against accidental overwrite using a 7-command enable algorithm. Software data protection requires a 3-byte command sequence (AAh/55h/A0h) before any sector program.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Mbit (262,144 × 8), organized as 256K bytes - sufficient for full BIOS images or real-time OS kernels in legacy x86 and microcontroller systems. |
| Read Access Time | 150 ns max - meets timing requirements for 6-MHz Z80, 8-MHz 8051, and early ARM7 bus interfaces without wait states. |
| Sector Program Time | 10 ms typical - enables rapid field firmware updates per 256-byte sector without full-chip erase delays. |
| Endurance | >10,000 program/erase cycles per sector - supports long-term field calibration data logging and infrequent firmware upgrades. |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5V logic systems. |
| Standby Current | 100 µA (CMOS, commercial temp) - enables low-power retention in battery-backed industrial controllers during sleep mode. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade PC motherboards, peripheral cards, and office equipment. |
Pinout & Package
AT29C020-15JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016 Variation AE, with 1.27 mm pitch, 12.45 mm × 14.95 mm body size, and gull-wing leads for surface-mount reliability.
| 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; carries data during read, byte-load, and program operations; supports DATA polling on I/O7 and toggle-bit detection on I/O6. |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high state forces outputs to high-impedance and inhibits all writes. |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention; must be high during program cycles. |
| WE | Write Enable | Active-low write strobe; initiates byte load or program; combined with CE for dual-control programming safety. |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; internal VCC sense disables programming if below 3.8 V. |
| GND | Ground | Reference for all input thresholds and output levels; decoupling required near VCC pin for noise immunity. |
| NC | No Connect | Pin 1 (PLCC top view) is unconnected - must remain floating; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| 5-V-only sector programming | Eliminates need for 12-V programming supplies; simplifies power design and enables in-system firmware updates via standard logic-level signals. |
| Hardware data protection | VCC sense, 5-ms power-on delay, and noise filtering (<15 ns) prevent spurious writes during power-up, brown-out, or EMI events. |
| Boot block lockout | Two independent 8K-byte regions (low/high) can be permanently write-locked to protect bootloader code from corruption during application firmware updates. |
| DATA polling & toggle-bit detection | Real-time program status monitoring via I/O7 complement read or I/O6 toggling - avoids fixed-timing delays and enables deterministic firmware flow control. |
| Software data protection | User-enabled 3-byte unlock sequence (5555h/2AAAh/5555h + A0h) adds authentication layer before sector programming, preventing accidental host software overwrites. |
Applications
| PC BIOS Storage | Industrial PLC Firmware |
|---|---|
Use Scenario: Storing boot firmware and POST routines on x86 motherboard platforms requiring nonvolatile, field-upgradable code memory. IC Role / Device Role / Timing Role: Primary boot ROM replacement; provides EPROM-compatible read interface with in-system reprogrammability. Use Value: Enables BIOS updates via floppy/USB without removing the chip; dual boot blocks isolate critical startup code from application updates. | Use Scenario: Retaining ladder logic programs and configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory with sector-level update capability; withstands repeated power cycling and temperature extremes. Use Value: 10,000-cycle endurance and 0°C–70°C operation ensure reliable firmware retention over 10+ years of industrial use. |
| Legacy Embedded Controller | Network Equipment Bootloader |
Use Scenario: Hosting firmware for 8-bit/16-bit microcontrollers (e.g., Z80, 8051, 68HC11) in medical devices and test instruments where cost-sensitive 5V-only design is mandatory. IC Role / Device Role / Timing Role: Memory-mapped code storage with 150 ns access time - directly interfaced to microcontroller address/data buses without glue logic. Use Value: CMOS/TTL compatibility and 40 mA active current allow direct integration into legacy 5V systems with minimal board redesign. | Use Scenario: Storing bootloaders and FPGA configuration bitstreams in Ethernet switches and DSLAMs requiring secure, field-upgradable initialization code. IC Role / Device Role / Timing Role: Secure boot memory with programmable lockout; protects first-stage bootloader from tampering during remote firmware upgrades. Use Value: Independent boot block lockout prevents corruption of bootloader region while allowing application firmware updates in remaining memory space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29F020-150EC | 4 Mbit (512K × 8), 150 ns access, 5 V ±10%, PLCC-32 - double capacity but slower read timing. | Requires wider address bus (A0–A18); not pin-compatible due to different sector architecture and command set. | Select when higher density is needed and 150 ns read latency is acceptable; verify bootloader compatibility with AMD command protocol. |
| MX29F020-15PC | 2 Mbit (256K × 8), 150 ns access, 5 V ±10%, PDIP-32 - identical density and voltage but slower speed and through-hole packaging. | Lacks boot block lockout and software data protection; uses different sector programming algorithm. | Choose for prototyping or legacy through-hole designs where PLCC rework is impractical; confirm absence of lockout requirement in target system. |
Compared with AM29F020-150EC and MX29F020-15PC, the AT29C020-15JC offers faster 150 ns read access than the MX29F020, built-in boot block security absent in both alternatives, and true 5-V-only programming unlike AMD's 12-V requirement - making it optimal for cost-constrained, security-aware commercial 5V systems.
Availability
AT29C020-15JC is available at Aetrix Electronics and suitable for PC motherboard BIOS storage, industrial PLC firmware retention, and legacy embedded controller boot memory requiring stable component supply across extended production lifecycles.
Supply support for AT29C020-15JC 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 AT29C020-15JC belongs to Atmel's legacy parallel Flash memory product line, designed specifically for 5V embedded systems needing in-system reprogrammability, robust data protection, and EPROM drop-in replacement capability.
FAQ
What is the maximum read access time specification for the AT29C020-15JC?
The AT29C020-15JC has a maximum read access time of 150 ns, as indicated by the "-15" suffix in its part number. This value is guaranteed across the commercial temperature range (0°C to +70°C) and defines the delay from address stabilization and CE/OE assertion to valid data appearing on I/O0–I/O7. The device also supports faster 70 ns and 90 ns variants, but the AT29C020-15JC is rated for 150 ns operation.
Does the AT29C020-15JC require high-voltage programming signals?
No, the AT29C020-15JC does not require high-voltage programming signals. It is a 5-volt-only Flash memory: all programming, erasing, and reading operations use only the standard VCC supply (5 V ±10%). Programming is initiated via standard logic-level WE and CE pulses, with internal circuitry generating necessary high-voltage conditions - eliminating external 12-V generators and simplifying system design.
How many sectors does the AT29C020-15JC have, and what is the sector size?
The AT29C020-15JC contains 1024 sectors, each 256 bytes in size. This sector organization enables granular firmware updates: only the modified 256-byte block needs reprogramming, rather than erasing the entire 256K-byte array. Sector addresses are selected using A8–A17, while A0–A7 specify the byte offset within the sector during byte-load operations.
What protection mechanisms prevent accidental programming of the AT29C020-15JC?
The AT29C020-15JC incorporates dual protection: hardware safeguards (VCC sense disabling programming below 3.8 V, 5-ms power-on delay, and 15 ns noise filtering on WE/CE) and software protection (a user-configurable 3-byte unlock sequence: AAh to 5555h, 55h to 2AAAh, then A0h to 5555h). Both mechanisms must be satisfied for sector programming to execute - preventing corruption during power transients or unintended host writes.
Can the AT29C020-15JC be used as a direct replacement for standard EPROMs like the 27C020?
Yes, the AT29C020-15JC is designed as an EPROM-compatible Flash replacement: it uses identical pinout (PLCC-32), same VCC/GND placement, and identical read-cycle timing (CE/OE/WE control). However, it requires explicit sector programming commands and lacks UV-erasability. For read-only operation, no changes are needed; for in-system programming, host firmware must implement Atmel's sector load and DATA polling protocols - the AT29C020-15JC itself remains electrically and logically compatible during reads.
AT29C020-15JC 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:
- 150 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)
AT29C020-15JC FAQ
1.How can I place an order for AT29C020-15JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-15JC 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 AT29C020-15JC reliable?
The price and inventory of AT29C020-15JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-15JC is usually 5 days.
3.What payment methods are accepted for AT29C020-15JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-15JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-15JC?
AT29C020-15JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-15JC 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 AT29C020-15JC?
For technical support, including AT29C020-15JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-15JC requirements.
6.How does Aetrix verify that AT29C020-15JC is sourced from the original manufacturer or authorized distributors?
All AT29C020-15JC 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 AT29C020-15JC meets industry standards.
7.What is the process for return or replacement of AT29C020-15JC?
All AT29C020-15JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-15JC, 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 AT29C020-15JC part is unused and in its original packaging.
Return procedure for AT29C020-15JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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