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Microchip Technology AT29C020-70PI
- Part No.:
- AT29C020-70PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C020-70PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,243
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Product details
Overview
AT29C020-70PI 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 industrial embedded controllers.
For engineers reviewing the AT29C020-70PI datasheet, AT29C020-70PI pinout, AT29C020-70PI application, or AT29C020-70PI equivalent, key selection considerations include its 5V-only reprogramming architecture, DATA polling and TOGGLE BIT end-of-program detection, hardware/software data protection, sector-based 256-byte programming, and industrial temperature range support (–40°C to +85°C).
Technical Context
The AT29C020-70PI implements sector-erase-and-program architecture with 1024 sectors of 256 bytes each, internal address/data latches for full-sector buffering, and autonomous internal timer-controlled programming. It supports byte-load sequencing via WE or CE strobes with strict 150 µs inter-byte timing.
Its dual boot block lockout enables secure system startup by permanently protecting first and last 8K-byte regions after activation via seven-command algorithm. Hardware protection includes VCC sense (<3.8 V inhibit), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), sufficient for firmware images up to 256 KB in size |
| Read Access Time | 70 ns - enables direct execution from flash in 8-bit microcontroller systems without wait states |
| Sector Size | 256 bytes - allows fine-grained firmware updates without erasing entire device |
| Program Cycle Time | 10 ms per sector - deterministic timing for host controller timeout handling |
| Endurance | >10,000 write/erase cycles per sector - supports field firmware upgrades over product lifetime |
| Supply Voltage | 5 V ±10% - eliminates need for charge pumps or high-voltage programming circuitry |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and instrumentation |
| Standby Current | 100 µA CMOS - enables low-power retention during system sleep modes |
Pinout & Package
AT29C020-70PI is packaged in a 32-pin plastic DIP (PDIP), 0.600" wide (package code 32P6), with through-hole mounting and industry-standard footprint compatible with legacy socketed designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 262,144-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 on I/O6 |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high disables outputs and forces standby mode |
| 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 strobe; initiates byte loads and programs; timing-critical for sector programming sequence |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; internally monitored for programming safety |
| GND | Ground | Reference for all input thresholds and output levels; decoupling required near VCC pin |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid reliability risk |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V-only reprogramming | Eliminates external high-voltage generators and simplifies PCB layout and BOM |
| Hardware + software data protection | Prevents accidental writes during power-up/down or noise events via VCC sensing, 5 ms delay, and 3-byte unlock sequence |
| Dual 8K-byte boot blocks with lockout | Enables secure bootloader storage: lower block (0x00000–0x01FFF) and upper block (0x3E000–0x3FFFF) can be independently locked |
| DATA polling & TOGGLE BIT | Allows host MCU to detect program completion without fixed delays - reduces firmware overhead and improves update reliability |
| CMOS/TTL-compatible I/O | Interfaces directly with 5V microcontrollers, FPGAs, and ASICs without level-shifting components |
| Industrial temperature range | Validated operation from –40°C to +85°C supports deployment in harsh environments like factory automation and outdoor equipment |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory holding boot loader, runtime firmware, and parameter tables; accessed at power-on reset and during field updates. Use Value: 10,000-cycle endurance and industrial temperature rating ensure reliable long-term operation; boot block lockout prevents corruption of critical startup code during remote firmware patches. |
Use Scenario: Holding boot code and initial configuration for Ethernet/Wi-Fi routers in telecom infrastructure cabinets where thermal cycling and vibration occur. IC Role / Device Role / Timing Role: Primary boot memory mapped to CPU reset vector; provides fast 70 ns read access for immediate instruction fetch post-reset. Use Value: 70 ns access time avoids CPU wait states; sector programming allows incremental updates to routing tables without full device erase; DATA polling enables deterministic update timing. |
| Medical Diagnostic Equipment Calibration Data | Automotive Body Control Module (BCM) Configuration |
|
Use Scenario: Retaining sensor calibration coefficients and diagnostic history logs in portable ultrasound or ECG devices requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Secure nonvolatile storage for calibrated parameters and event logs; accessed during self-test and service mode. Use Value: Dual boot block lockout protects calibration constants from overwrite; software data protection prevents unauthorized modification; 100 µA standby current extends battery life in portable units. |
Use Scenario: Storing vehicle-specific configuration (e.g., door lock behavior, lighting profiles) in BCMs that must retain settings across battery disconnects and ignition cycles. IC Role / Device Role / Timing Role: Configuration memory mapped into microcontroller's data space; updated during dealer programming or OTA updates. Use Value: 5V-only operation matches automotive 5V supply rails; hardware VCC sensing prevents writes during brown-out conditions; sector granularity enables safe partial rewrites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020B-70EC | 3.3 V core with 5 V I/O tolerance; 70 ns access; 100,000 endurance cycles; no boot block lockout | Lacks dedicated boot block protection; requires level translation if interfacing with pure 5 V systems | Choose when higher endurance and lower voltage operation are prioritized over boot security and 5 V simplicity |
| MX29LV020CTTI-70G | 3.3 V supply only; 70 ns access; 100,000 cycles; software-controlled boot block protection (not hardware-lockable) | Requires 3.3 V regulator; boot protection relies solely on software state, not physical lockout | Select for new 3.3 V designs needing extended endurance; avoid if legacy 5 V compatibility or hardware-enforced boot security is required |
Compared with AM29LV020B-70EC and MX29LV020CTTI-70G, the AT29C020-70PI uniquely delivers true 5 V-only operation with hardware-enforced boot block lockout - making it the only option among the three that guarantees irreversible protection of startup code without external supervision or voltage translation.
Availability
AT29C020-70PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, and medical diagnostic equipment calibration data requiring stable component supply across extended production lifecycles.
Supply support for AT29C020-70PI 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT29C020-70PI belongs to Atmel's legacy 5V Flash memory product line, designed specifically for industrial and embedded systems requiring robust, socket-compatible firmware storage with hardware-level data integrity safeguards.
FAQ
What is the operating temperature range for the AT29C020-70PI?
The AT29C020-70PI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table and DC Operating Range section of the datasheet. The "I" suffix in AT29C020-70PI explicitly denotes industrial grade. Its performance - including 70 ns access time and 100 µA standby current - is guaranteed across this full range.
Does the AT29C020-70PI require high-voltage programming signals?
No, the AT29C020-70PI does not require high-voltage programming signals. It is a 5-volt-only Flash memory: all programming, erasing, and reading operations use only a single 5 V ±10% supply. Programming is initiated using standard 5 V logic levels on WE and CE pins, with no external VPP or charge pump needed - a key differentiator from earlier EPROM or EEPROM technologies.
How many sectors does the AT29C020-70PI have, and what is the sector size?
The AT29C020-70PI contains 1024 sectors, each 256 bytes in size. This is explicitly stated in the Features section and supported by the memory organization (262,144 bytes ÷ 256 = 1024). Sector addressing uses A8–A17, while A0–A7 select the byte within the sector. This granularity enables targeted firmware updates without full-chip erasure.
What methods are available to detect the end of a program cycle on the AT29C020-70PI?
The AT29C020-70PI provides two hardware-supported methods: DATA polling (monitoring complement-to-data on I/O7) and TOGGLE BIT (observing toggling on I/O6). Both are active during programming and cease when the cycle completes. These mechanisms eliminate reliance on fixed timeouts and allow the host controller to proceed immediately upon completion - a critical feature for real-time firmware update reliability in the AT29C020-70PI.
Can the boot blocks on the AT29C020-70PI be unlocked after programming lockout is enabled?
Yes, the boot block programming lockout on the AT29C020-70PI is reversible. The datasheet specifies a 7-command enable algorithm and a separate 7-command disable algorithm. Once disabled, both 8K-byte boot blocks (lower: 0x00000–0x01FFF; upper: 0x3E000–0x3FFFF) regain full programmability. However, chip erase is disabled while either block is locked - a safeguard enforced in silicon.
AT29C020-70PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C020-70PI FAQ
1.How can I place an order for AT29C020-70PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-70PI 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 AT29C020-70PI reliable?
The price and inventory of AT29C020-70PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-70PI is usually 5 days.
3.What payment methods are accepted for AT29C020-70PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-70PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-70PI?
AT29C020-70PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-70PI 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 AT29C020-70PI?
For technical support, including AT29C020-70PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-70PI requirements.
6.How does Aetrix verify that AT29C020-70PI is sourced from the original manufacturer or authorized distributors?
All AT29C020-70PI 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 AT29C020-70PI meets industry standards.
7.What is the process for return or replacement of AT29C020-70PI?
All AT29C020-70PI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-70PI, 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 AT29C020-70PI part is unused and in its original packaging.
Return procedure for AT29C020-70PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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