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Microchip Technology AT29C020-70TU
- Part No.:
- AT29C020-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-70TU.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
AT29C020-70TU from Atmel is a 2-Mbit (256K × 8) 5V-only Flash memory IC designed for in-system reprogrammability in embedded firmware storage applications. It delivers 70 ns read access time, supports sector-based programming of 256-byte blocks, features hardware and software data protection, and includes two 8K-byte boot blocks with independent lockout capability.
For engineers reviewing the AT29C020-70TU datasheet, AT29C020-70TU pinout, AT29C020-70TU application, or AT29C020-70TU equivalent, key selection considerations include its 70 ns read timing, 10 ms sector program cycle, CMOS/TTL-compatible I/O, 5V ±10% supply operation, and dual boot block lockout for secure system boot code storage.
Technical Context
The AT29C020-70TU implements a sector-erase-and-program architecture where each 256-byte sector is internally latched before simultaneous programming. Its internal control timer manages erase and program phases without external timing components.
It supports both hardware-based protection (VCC sense, noise filtering, CE/OE/WE inhibit) and software-controlled protection via three-byte command sequences at specific addresses (5555H/2AAAH). Boot block lockout is enabled by a seven-command algorithm targeting addresses 00000H and 3FFFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K bytes |
| Read Access Time | 70 ns - enables direct replacement of EPROMs in legacy 5V systems |
| Sector Size | 256 bytes - defines minimum erasable/programmable unit; 1024 sectors total |
| Program Cycle Time | 10 ms per sector - fixed internal timing eliminates need for external wait-state logic |
| VCC Supply | 5 V ±10% - single-supply operation compatible with standard TTL/CMOS logic rails |
| Endurance | >10,000 write/erase cycles per sector - validated for firmware update cycles in industrial controllers |
| Standby Current | 300 µA (CMOS) - low-power retention during system sleep modes |
| Operating Temp | −40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
AT29C020-70TU is available in 32-lead TSOP (Type 1, package code 32T) - 8 mm × 20 mm body, 0.5 mm pitch, gull-wing leads, JEDEC MO-142 BD compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-byte addressing (A0–A17) |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; latched during sector load for internal programming |
| CE | Chip Enable | Active-low chip select; must be low for read, program, or identification modes |
| OE | Output Enable | Active-low output control; high during program cycles to prevent bus contention |
| WE | Write Enable | Active-low control for byte loading and sector programming initiation |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O buffers |
| GND | Ground | Reference return path for all signals and power |
| NC | No Connect | Unbonded pin; must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for +12V programming voltage; simplifies power design and reduces BOM count |
| DATA Polling on I/O7 | Enables real-time end-of-program detection without requiring status registers or external polling overhead |
| Toggle Bit on I/O6 | Provides alternate asynchronous method to monitor program/erase completion using simple bit-flip detection |
| Boot Block Lockout | Two independent 8K-byte regions (lowest and highest addresses) can be permanently write-protected to safeguard boot code |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and 15 ns noise filtering prevent spurious writes during power-up or EMI events |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System BIOS |
|---|---|
Use Scenario: Storing field-upgradable ladder logic and configuration data in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability; 70 ns read timing ensures deterministic scan-cycle execution. Use Value: Sector-level updates allow partial firmware patches without full device erase; boot block lockout prevents corruption of critical startup routines. | Use Scenario: Holding boot initialization code and hardware abstraction layer in legacy x86-compatible embedded controllers. IC Role / Device Role / Timing Role: Drop-in EPROM replacement providing identical pinout and read behavior while enabling field updates. Use Value: 5V-only operation matches legacy 5V bus standards; CMOS/TTL compatibility ensures seamless integration with ISA-style address/data buses. |
| Medical Device Configuration Memory | Automotive Diagnostic Module Code |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and safety-critical configuration parameters across power cycles in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, endurance-rated nonvolatile storage with hardware/software write protection to meet IEC 62304 data integrity requirements. Use Value: Dual boot block lockout isolates immutable calibration constants from field-updatable application logic; >10,000 cycle rating supports long product lifecycles. | Use Scenario: Hosting OBD-II protocol stack and vehicle-specific calibration tables in aftermarket diagnostic tools. IC Role / Device Role / Timing Role: Firmware storage with fast sector reprogramming for over-the-air (OTA) updates via CAN-connected host. Use Value: 10 ms sector program time enables rapid patch deployment; DATA polling allows efficient host-side synchronization without fixed delays. |
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, 3.0–3.6 V supply, 70 ns access, no boot block lockout | Requires 3.3 V supply rail; lacks dedicated boot protection; higher capacity but incompatible voltage domain | Select only if migrating to 3.3 V systems and needing larger memory footprint without boot security |
| MX29LV040CTTI-70G | 4 Mbit, 3.0–3.6 V, 70 ns, top/bottom boot block support, but no software lockout enable sequence | Boot blocks are fixed-location only; no user-configurable lockout activation; different command set | Choose when boot block location alignment matters more than runtime lockout control; verify command compatibility with existing firmware |
Compared with AM29LV040B-70JC and MX29LV040CTTI-70G, the AT29C020-70TU uniquely provides 5V-only operation with user-activatable boot block lockout and sector-level DATA polling-making it suitable for legacy 5V designs requiring field-secure firmware updates.
Availability
AT29C020-70TU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system BIOS, and medical device configuration memory requiring stable component supply and long-term lifecycle support.
Supply support for AT29C020-70TU 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, Flash memory, and secure authentication devices.
The AT29C020-70TU belongs to Atmel's legacy 5V Flash memory product line, engineered for drop-in EPROM replacement and in-system firmware updates in industrial and embedded applications.
FAQ
What is the maximum operating temperature range for the AT29C020-70TU?
The AT29C020-70TU is rated for industrial temperature operation from −40°C to +85°C. This range is validated per the device's DC and AC specifications and applies to all guaranteed timing parameters including the 70 ns read access time and 10 ms sector program cycle. Operation outside this range may result in undefined behavior or reduced endurance.
Does the AT29C020-70TU require high-voltage programming signals?
No, the AT29C020-70TU does not require high-voltage programming signals. It uses 5-volt-only commands for all operations-including sector erase and program-eliminating the need for +12V or other elevated voltages. Programming is initiated via standard WE/CE/OE control signals with valid address and data sequences, making it compatible with conventional 5V microcontroller interfaces.
How is end-of-program detection implemented in the AT29C020-70TU?
The AT29C020-70TU supports two hardware methods for end-of-program detection: DATA polling on I/O7 (complement-to-data until completion) and Toggle Bit monitoring on I/O6 (bit toggles during operation, stabilizes upon completion). Both methods operate asynchronously and do not require external clocks or status registers, enabling efficient host-side synchronization during sector programming.
Can the boot blocks in the AT29C020-70TU be unlocked after lockout is enabled?
No, the boot block lockout feature in the AT29C020-70TU is irreversible once activated. The lockout is implemented via permanent fuse-like circuitry triggered by the seven-command enable algorithm. After activation, neither the lower nor upper 8K-byte boot block can be erased or programmed-even by chip erase-ensuring absolute protection of stored boot code.
What package type does the AT29C020-70TU use, and is it RoHS-compliant?
The AT29C020-70TU uses a 32-lead Thin Small Outline Package (TSOP, Type 1, package code 32T), measuring 8 mm × 20 mm with 0.5 mm lead pitch. It is offered in a green (Pb/Halide-free) packaging option compliant with RoHS Directive 2011/65/EU, as confirmed in Atmel's ordering information and packaging documentation.
AT29C020-70TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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-TSOP
AT29C020-70TU FAQ
1.How can I place an order for AT29C020-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-70TU 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 AT29C020-70TU reliable?
The price and inventory of AT29C020-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-70TU is usually 5 days.
3.What payment methods are accepted for AT29C020-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-70TU?
AT29C020-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-70TU 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 AT29C020-70TU?
For technical support, including AT29C020-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-70TU requirements.
6.How does Aetrix verify that AT29C020-70TU is sourced from the original manufacturer or authorized distributors?
All AT29C020-70TU 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 AT29C020-70TU meets industry standards.
7.What is the process for return or replacement of AT29C020-70TU?
All AT29C020-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-70TU, 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 AT29C020-70TU part is unused and in its original packaging.
Return procedure for AT29C020-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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