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Microchip Technology AT29C020-70JU
- Part No.:
- AT29C020-70JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C020-70JU.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,373
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Product details
Overview
AT29C020-70JU 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, sector-based reprogramming (1024 sectors × 256 bytes), and hardware/software data protection. It operates across the industrial temperature range (−40°C to +85°C) and supports in-system programming without high-voltage inputs, commonly used in embedded boot code storage and firmware update applications.
For engineers reviewing the AT29C020-70JU datasheet, AT29C020-70JU pinout, AT29C020-70JU application, or AT29C020-70JU equivalent, key selection considerations include its PLCC-32 package, 5V ±10% supply compatibility, sector erase/program architecture, boot block lockout capability, and DATA polling/toggle bit programming status detection.
Technical Context
The AT29C020-70JU implements a sector-program architecture where each 256-byte sector is erased and programmed in a single internal cycle (10 ms typical), with address and data latched internally during load to free the bus. Programming requires no external high voltage-only standard 5V logic levels and precise command sequences (e.g., AAh/55h/A0h for software protection enable).
It integrates dual protection mechanisms: hardware-level VCC sensing (<3.8V inhibits programming), noise filtering on WE/CE (<15 ns pulses ignored), and software-controlled data protection via three-byte unlock sequences. Boot block lockout is independently configurable for two 8K-byte regions (lowest and highest addresses), disabling chip erase when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full firmware image storage for mid-complexity microcontrollers. |
| Read Access Time | 70 ns maximum-supports high-speed CPU interface without wait states in 5V systems. |
| Supply Voltage | 5V ±10%-simplifies power design by eliminating dedicated programming voltage rails. |
| Sector Size | 256 bytes per sector-enables fine-grained firmware updates without erasing entire memory space. |
| Endurance | >10,000 program/erase cycles per sector-suitable for field-upgradable devices with moderate update frequency. |
| Standby Current | 300 µA CMOS-minimizes quiescent power in battery-backed or low-power hold modes. |
| Operating Temp | −40°C to +85°C-certified for industrial-grade embedded control and communications equipment. |
Pinout & Package
AT29C020-70JU is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch and 12.45 mm × 12.45 mm body size. Pin 1 identifier is a corner notch; leads are gull-wing shaped with coplanarity ≤0.102 mm.
| 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. |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path for read, byte load, and program operations; supports DATA polling on I/O7 and toggle bit on I/O6. |
| CE | Chip Enable | Active-low device select; must be low with OE low and WE high for read; held high to enter standby mode (300 µA). |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention; must be high during programming. |
| WE | Write Enable | Active-low write control; initiates byte load and sector program cycles; timing-critical (tWP ≥ 90 ns, tBLC = 150 µs). |
| VCC | Power Supply | +5V ±10% main supply; internal VCC sense disables programming if voltage drops below ~3.8V. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal circuitry. |
| NC | No Connect | Unbonded pin-must remain unconnected per datasheet; present in both PLCC and TSOP variants. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle sector erase/program | Eliminates separate erase step-reduces firmware update latency and simplifies host controller logic. |
| Dual boot block lockout (2 × 8K bytes) | Prevents accidental overwrite of critical startup code in either lowest or highest memory region-enhances system reliability. |
| DATA polling & toggle bit status detection | Enables real-time, non-blocking program completion monitoring using only standard read cycles-no timer or interrupt overhead required. |
| Hardware + software data protection | Combines VCC sensing, noise filtering, and 3-byte unlock sequences to prevent spurious writes during power transients or EMI events. |
| Green (Pb/halide-free) packaging | Meets RoHS Directive 2011/65/EU requirements-enables compliance in environmentally regulated industrial and telecom markets. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Backup Memory |
|---|---|
Use Scenario: Storing configuration parameters and control logic in programmable logic controllers deployed in factory automation environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level update capability and hardware write protection to ensure deterministic boot behavior after power loss. Use Value: Enables field firmware patches without replacing the entire module; boot block lockout prevents corruption of safety-critical initialization routines. | Use Scenario: Acting as secondary BIOS storage in legacy x86 motherboards, retaining fallback firmware images accessible via shadow RAM mapping. IC Role / Device Role / Timing Role: Read-access-optimized Flash memory providing 70 ns instruction fetch latency compatible with ISA bus timing constraints. Use Value: Supports hot-swap BIOS recovery without requiring external programming hardware-critical for server maintenance and repair workflows. |
| Telecom Line Card Boot Code | Medical Diagnostic Equipment Configuration |
Use Scenario: Hosting boot loader and FPGA configuration bitstreams on carrier-grade line cards operating continuously in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: In-system reprogrammable memory with 10,000-cycle endurance and −40°C to +85°C operation-ensuring long-term reliability under thermal cycling. Use Value: Allows remote firmware upgrades via backplane without card removal-reducing mean time to repair (MTTR) in central office deployments. | Use Scenario: Storing calibration coefficients, user interface language packs, and regulatory compliance settings in FDA-cleared diagnostic imaging systems. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with software data protection enabled to prevent unauthorized parameter modification. Use Value: Meets IEC 62304 software lifecycle requirements by ensuring configuration integrity across power cycles and service interventions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70JC | 4 Mbit density, 3.0–3.6V supply, 70 ns access, 12V programming voltage required for legacy mode. | Requires external 12V generator; not 5V-only-increases BOM cost and layout complexity. | Choose only if higher density and 3.3V compatibility outweigh need for 5V simplicity and in-system reprogrammability. |
| MX29LV040CTTI-70G | 4 Mbit, 3.0–3.6V core, 5V I/O tolerant, 70 ns access, no high-voltage programming, but lacks boot block lockout. | Missing independent 8K boot block protection-unsuitable where secure bootloader partitioning is mandatory. | Select when 3.3V system integration is primary and boot security is handled externally via MCU firmware. |
Compared with AT29C020-70JU, AM29LV040B-70JC demands additional voltage rail support and increases board area, while MX29LV040CTTI-70G trades boot block security for lower operating voltage-neither offers identical 5V-only simplicity, sector granularity, and dual-lockout capability.
Availability
AT29C020-70JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS backup, and telecom line card boot code applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AT29C020-70JU 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.
The AT29C020-70JU belongs to Atmel's legacy 5V Flash memory product line, designed specifically for cost-sensitive, industrial-grade embedded systems requiring reliable in-system reprogrammability without high-voltage circuitry.
FAQ
What is the maximum read access time specified for the AT29C020-70JU?
The AT29C020-70JU has a maximum read access time of 70 ns, measured from address valid to valid data on I/O0–I/O7 under industrial temperature conditions (−40°C to +85°C) and VCC = 5V ±10%. This timing enables direct interfacing with 14 MHz bus clocks without wait states in standard 5V microcontroller systems.
Does the AT29C020-70JU require high-voltage programming signals?
No, the AT29C020-70JU is a 5-volt-only Flash memory-programming is performed using standard 5V logic levels and specific command sequences (e.g., AAh/55h/A0h). It does not require external 12V or higher programming voltages, simplifying system power design and eliminating high-voltage generation circuitry.
How many sectors does the AT29C020-70JU contain, and what is the size of each sector?
The AT29C020-70JU contains 1024 sectors, each consisting of 256 bytes. This sector structure allows partial reprogramming without erasing the entire memory array-critical for updating firmware images or configuration data while preserving operational code in adjacent sectors.
What package type is used for the AT29C020-70JU, and is it lead-free?
The AT29C020-70JU uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (JEDEC MS-016, variant AE), and it is offered in a green (Pb/halide-free) packaging option compliant with RoHS Directive 2011/65/EU-confirmed in the official Atmel ordering information table.
Can the AT29C020-70JU be used in systems requiring secure boot code protection?
Yes-the AT29C020-70JU includes two independent 8K-byte boot blocks (lowest and highest address regions) with programmable lockout. Once enabled via the documented 7-command sequence, these blocks become permanently read-only, preventing accidental or malicious overwrite of critical boot code-making AT29C020-70JU suitable for secure boot architectures.
AT29C020-70JU 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:
- 70 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)
AT29C020-70JU FAQ
1.How can I place an order for AT29C020-70JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-70JU 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 AT29C020-70JU reliable?
The price and inventory of AT29C020-70JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-70JU is usually 5 days.
3.What payment methods are accepted for AT29C020-70JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-70JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-70JU?
AT29C020-70JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-70JU 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 AT29C020-70JU?
For technical support, including AT29C020-70JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-70JU requirements.
6.How does Aetrix verify that AT29C020-70JU is sourced from the original manufacturer or authorized distributors?
All AT29C020-70JU 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 AT29C020-70JU meets industry standards.
7.What is the process for return or replacement of AT29C020-70JU?
All AT29C020-70JU units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-70JU, 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 AT29C020-70JU part is unused and in its original packaging.
Return procedure for AT29C020-70JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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