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Microchip Technology AT29C020-70PC
- Part No.:
- AT29C020-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C020-70PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,619
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Product details
Overview
AT29C020-70PC 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 serves as nonvolatile program storage in embedded microcontroller systems requiring in-system reprogrammability without high-voltage programming.
For engineers reviewing the AT29C020-70PC datasheet, AT29C020-70PC pinout, AT29C020-70PC application, or AT29C020-70PC equivalent, key selection criteria include its 70 ns access time, 5 V ±10% single-supply operation, boot block lockout capability for secure firmware storage, and compatibility with standard EPROM read interfaces in industrial control and legacy system upgrades.
Technical Context
The AT29C020-70PC implements sector erase-and-program architecture with internal address/data latches for 256-byte sectors and an autonomous internal timer that manages full erase-then-program sequencing upon command initiation. Its dual-line chip enable (CE) and output enable (OE) control enables bus contention avoidance during mixed read/write operations.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, noise filtering (<15 ns pulses ignored), and CE/OE/WE state monitoring; software protection uses a three-byte command sequence (AAh/55h/A0h at 5555h/2AAAh/5555h) to gate all subsequent sector writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling storage of firmware images up to 256 KB in size |
| Read Access Time | 70 ns maximum - supports direct interface with 14 MHz microcontrollers without wait states |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails or charge pumps |
| Sector Size | 256 bytes per sector - allows fine-grained firmware updates without erasing entire memory |
| Endurance | >10,000 write/erase cycles per sector - suitable for field-upgradable applications with moderate update frequency |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed systems |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade embedded equipment environments |
Pinout & Package
AT29C020-70PC is packaged in a 32-pin plastic dual inline package (PDIP), 0.600" wide (32P6), with through-hole mounting and industry-standard footprint compatible with legacy EPROM sockets.
| 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 data path for read, byte load, and program operations; TTL/CMOS compatible |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state and inhibits programming |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention during reads |
| WE | Write Enable | Active-low signal initiating byte load or sector program; timing-critical for 150 µs inter-byte loading window |
| NC | No Connect | Pin 1 (DIP top view) is unconnected - must remain floating or grounded per layout guidelines |
| VCC | Power Supply | +5 V ±10% supply input; powers core logic and I/O buffers |
| GND | Ground | Reference ground for all signals and power; requires low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | Two independent 8 KB blocks (lowest and highest addresses) can be permanently write-protected to safeguard bootloader code |
| DATA Polling | I/O7 complements last loaded byte during programming - enables real-time end-of-write detection without external timers |
| Toggle Bit Detection | I/O6 toggles during program/erase - provides alternative polling method usable at any address location |
| Software Chip Erase | Entire memory erased via 6-byte command sequence - simplifies full firmware replacement without hardware programmer |
| Hardware Program Inhibit | Automatic disable if VCC <3.8 V, OE low, CE high, or WE high - prevents accidental writes during power transitions |
Applications
| Industrial PLC Firmware Storage | Legacy System BIOS Replacement |
|---|---|
Use Scenario: Storing ladder logic programs and configuration data in programmable logic controllers operating in factory-floor environments with temperature cycling and EMI. IC Role / Device Role / Timing Role: Nonvolatile program memory holding user-defined control algorithms; accessed via 8-bit parallel bus synchronized to microcontroller clock. Use Value: 70 ns access time ensures deterministic scan-cycle timing; boot block lockout prevents corruption of safety-critical startup routines during field updates. | Use Scenario: Replacing obsolete 27C020 EPROMs in aging PC motherboards or industrial HMIs where socket compatibility and 5 V operation are mandatory. IC Role / Device Role / Timing Role: Drop-in Flash ROM replacement providing identical pinout and read timing to EPROMs while enabling in-system firmware updates. Use Value: Sector programming allows partial BIOS updates without removing the device; 5 V-only operation avoids redesigning power delivery circuitry. |
| Embedded Controller Bootloader Memory | Medical Device Configuration Storage |
Use Scenario: Holding secure bootloader code in Class II medical devices requiring regulatory-compliant firmware integrity and field upgrade capability. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; first executed code verifies application image signature before transfer control. Use Value: Independent 8 KB boot block lockout ensures bootloader remains immutable after factory programming; >10,000 endurance supports lifetime calibration data logging. | Use Scenario: Storing device-specific calibration coefficients, patient usage logs, and regulatory compliance metadata in portable diagnostic instruments. IC Role / Device Role / Timing Role: Parameter EEPROM replacement with higher density and faster write throughput for time-stamped event records. Use Value: 256-byte sector granularity enables atomic updates of individual calibration sets; 100 µA standby current extends battery life in handheld units. |
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 V core with 5 V tolerant I/O; 70 ns read; 12 V required for reset; no boot block lockout | Lacks dedicated boot block protection; requires voltage translation for pure 5 V systems | Select only if migrating to lower-voltage design and external reset circuitry is acceptable |
| MX29LV200CTT-70G | 3 V supply; 70 ns read; CFI-compliant; 16-bit data bus; boot block organization differs (top/bottom 16 KB) | Requires 16-bit interface redesign; different boot block size and lock mechanism | Prefer for new 3 V designs needing JEDEC CFI standard support and larger boot regions |
Compared with AM29LV020B-70EC and MX29LV200CTT-70G, the AT29C020-70PC uniquely delivers 5 V-only operation with hardware-enforced boot block lockout and EPROM-compatible timing-making it the only drop-in solution for legacy 5 V systems requiring guaranteed bootloader immutability.
Availability
AT29C020-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy system BIOS replacement, and embedded controller bootloader memory requiring stable component supply across extended production lifecycles.
Supply support for AT29C020-70PC 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 solutions.
The AT29C020-70PC belongs to Atmel's legacy parallel Flash memory product line, designed specifically for 5 V embedded systems requiring in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum read access time specified for the AT29C020-70PC?
The AT29C020-70PC has a maximum read access time of 70 ns, measured from address valid to valid data on I/O0–I/O7 under VCC = 5 V ±10% and TA = 0°C to +70°C conditions. This timing allows direct interfacing with microcontrollers running at up to 14 MHz without wait-state insertion, preserving deterministic execution in real-time control applications.
Does the AT29C020-70PC require high-voltage programming signals?
No, the AT29C020-70PC operates with 5 V ±10% only for both read and program operations. It does not require 12 V or other elevated programming voltages. All reprogramming is controlled by standard 5 V logic-level commands, including sector erase-and-program sequences initiated via WE/CE timing and specific address/data patterns.
How many sectors does the AT29C020-70PC contain, and what is the size of each sector?
The AT29C020-70PC contains 1024 sectors, each consisting of 256 bytes. This sector structure enables granular firmware updates: only the modified 256-byte segment needs reloading and programming, minimizing update time and reducing wear on unaffected memory regions compared to full-chip erase methods.
Can the boot blocks of the AT29C020-70PC be independently locked against programming?
Yes, the AT29C020-70PC features two independent 8 KB boot blocks - one at the lowest addresses (0x00000–0x01FFF) and one at the highest addresses (0x3E000–0x3FFFF). Each block's lockout can be enabled separately using a seven-command algorithm, allowing flexible protection strategies for systems that boot from either end of memory space.
What methods are available to detect completion of a program cycle in the AT29C020-70PC?
The AT29C020-70PC supports two hardware-based program completion detection methods: DATA polling (monitoring complement-to-data behavior on I/O7) and Toggle Bit detection (observing toggling on I/O6). Both methods allow polling at any time during programming and eliminate dependency on fixed timeout values, improving system reliability and reducing firmware overhead.
AT29C020-70PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C020-70PC FAQ
1.How can I place an order for AT29C020-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-70PC 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 AT29C020-70PC reliable?
The price and inventory of AT29C020-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-70PC is usually 5 days.
3.What payment methods are accepted for AT29C020-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-70PC?
AT29C020-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-70PC 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 AT29C020-70PC?
For technical support, including AT29C020-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-70PC requirements.
6.How does Aetrix verify that AT29C020-70PC is sourced from the original manufacturer or authorized distributors?
All AT29C020-70PC 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 AT29C020-70PC meets industry standards.
7.What is the process for return or replacement of AT29C020-70PC?
All AT29C020-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-70PC, 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 AT29C020-70PC part is unused and in its original packaging.
Return procedure for AT29C020-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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