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Microchip Technology AT29C020-70TC
- Part No.:
- AT29C020-70TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-70TC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
AT29C020-70TC 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 commercial temperature range (0°C to 70°C) and is used in embedded system boot code storage, firmware updates, and industrial controller nonvolatile configuration retention.
For engineers reviewing the AT29C020-70TC datasheet, AT29C020-70TC pinout, AT29C020-70TC application, or AT29C020-70TC equivalent, key selection considerations include its TSOP-32 package, 5V-only programming compatibility, sector lockout for boot blocks, DATA polling/Toggle Bit program status detection, and endurance of >10,000 write/erase cycles.
Technical Context
The AT29C020-70TC implements sector-level Flash programming with internal latching of 256-byte sectors and automatic erase-then-program execution controlled by an on-chip timer. Its dual-line chip enable (CE) and output enable (OE) control enables bus contention avoidance during mixed read/write operations in microcontroller-based systems.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering (<15 ns pulses rejected); software protection requires a three-byte command sequence (AAh/55h/A0h) to enable/disable writes. Boot block lockout supports independent 8K-byte upper/lower region protection for secure bootloader storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time | 70 ns - meets timing requirements for 14 MHz Z80 or 8051-based systems without wait states |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage, simplifying power design |
| Sector Size | 256 bytes × 1024 sectors - allows fine-grained firmware patching without full chip erase |
| Endurance | >10,000 program/erase cycles per sector - supports field-upgradable devices with multi-year service life |
| Standby Current | 100 µA CMOS - suitable for battery-backed applications requiring low quiescent power |
| Operating Temp | 0°C to 70°C - validated for commercial-grade industrial control panels and instrumentation |
Pinout & Package
AT29C020-70TC is housed in a 32-lead Thin Small Outline Package (TSOP, Type I, 8 × 20 mm), compliant with JEDEC MO-142 BD. Pin 1 is marked by a beveled corner; leads are gull-wing with 0.5 mm pitch.
| 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; I/O7 used for DATA polling, I/O6 for Toggle Bit status monitoring |
| CE | Chip Enable | Active-low global device select; when high, places outputs in high-impedance state regardless of OE/WE |
| OE | Output Enable | Active-low read control; enables data output only when CE is also low - prevents bus contention |
| WE | Write Enable | Active-low programming control; initiates byte load or sector program cycle when CE is low and OE is high |
| 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 capacitor required near VCC pin |
| NC | No Connect | Pin 16 (TSOP top view) - must remain unconnected; no internal bonding or function |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle sector erase + program | Eliminates separate erase command step - reduces firmware update latency by up to 40% vs. legacy EPROMs |
| Two independent 8K-byte boot blocks | Enables secure dual-boot architecture: primary firmware in lower block, recovery image in upper block |
| Hardware + software data protection | Prevents accidental writes during power-up/down transients and unauthorized firmware modification via command gating |
| DATA polling & Toggle Bit status detection | Allows real-time program completion verification without external timers or interrupt overhead |
| CMOS/TTL I/O compatibility | Direct interface with legacy 8051, Z80, and 68K microcontrollers without level-shifting circuitry |
Applications
| Industrial PLC Firmware Storage | Embedded System Boot Code Retention |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration maps in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 70 ns read access to instruction fetch paths of 8-bit MCUs. Use Value: Sector lockout prevents corruption of critical startup routines during remote firmware updates over Modbus RTU links. | Use Scenario: Holding bootloader code and initial hardware initialization sequences in medical diagnostic equipment requiring regulatory-compliant firmware integrity. IC Role / Device Role / Timing Role: Boot block-protected Flash memory ensuring verified startup execution before loading application firmware from external media. Use Value: Dual 8K boot blocks allow A/B firmware partitioning - enabling fail-safe rollback after failed OTA update attempts. |
| Point-of-Sale Terminal Configuration | Telecom Line Card Parameter Storage |
Use Scenario: Retaining merchant-specific settings (tax rates, receipt formats, language packs) in retail POS terminals subject to frequent field reconfiguration. IC Role / Device Role / Timing Role: Field-updatable configuration memory supporting 256-byte sector writes aligned with parameter group boundaries. Use Value: 10,000-cycle endurance ensures >5 years of daily parameter updates under typical retail deployment conditions. | Use Scenario: Storing line calibration coefficients, protocol stack versions, and vendor-specific feature flags in DSLAM line cards operating in telecom central offices. IC Role / Device Role / Timing Role: Temperature-stable (0°C–70°C) nonvolatile memory interfacing directly with TI TMS320C54x DSPs via parallel bus. Use Value: 100 µA standby current minimizes thermal load in densely packed 19-inch rack-mounted chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV200CTTI-70G | 3.3 V core supply (5 V tolerant I/O), 70 ns access, 2 Mbit density, 128K × 16 organization | Requires level translation for pure 5 V systems; supports wider data bus for faster burst reads | Select when migrating to lower-power 3.3 V designs or needing 16-bit data path compatibility |
| EN29LV200AB-70TP | 3.0–3.6 V operation only, 70 ns access, same 2 Mbit density, supports CFI query mode | Incompatible with 5 V-only systems; requires redesign of power delivery and I/O interface | Choose for new 3.3 V designs requiring standardized CFI command set and extended temperature support (−40°C to 85°C) |
Compared with MX29LV200CTTI-70G and EN29LV200AB-70TP, the AT29C020-70TC offers native 5 V operation without level shifters, simpler software command set (no CFI overhead), and proven reliability in legacy industrial control platforms - making it optimal for cost-sensitive, long-lifecycle 5 V embedded upgrades.
Availability
AT29C020-70TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded system boot code retention, and point-of-sale terminal configuration requiring stable component supply and long-term obsolescence management.
Supply support for AT29C020-70TC 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 ICs, with a legacy of robust nonvolatile memory solutions for industrial and automotive markets.
The AT29C020-70TC belongs to Atmel's legacy 5-volt Flash memory product line, designed specifically for in-system reprogrammability in cost-sensitive, long-lifecycle embedded applications where 5 V infrastructure remains dominant.
FAQ
What is the maximum operating temperature range for the AT29C020-70TC?
The AT29C020-70TC is rated for commercial temperature operation from 0°C to 70°C. This specification is confirmed in the Ordering Information table on page 13 of the official Atmel datasheet (Rev. 0291N–FLASH–07/02), where the "-70TC" suffix explicitly denotes the commercial temperature grade in TSOP packaging. Industrial variants (e.g., AT29C020-70TI) support −40°C to 85°C but use different suffixes and packaging.
Does the AT29C020-70TC require high-voltage programming signals?
No, the AT29C020-70TC does not require high-voltage programming signals. As stated in the Description section, it is a "5-volt-only in-system Flash" device. Programming is performed using standard 5 V logic levels - no external 12 V or higher voltages are needed. The hardware data protection circuitry actively inhibits programming if VCC falls below ~3.8 V, ensuring safe operation within the specified 5 V ±10% supply range.
How many sectors does the AT29C020-70TC have, and what is the size of each sector?
The AT29C020-70TC contains 1024 sectors, each 256 bytes in size. This is explicitly documented in the Features list ("1024 Sectors (256 Bytes/Sector)") and reinforced in the Device Operation section, which states that "reprogramming is performed on a sector basis" and that "A8 to A17 specify the sector address." With 10 address bits (A8–A17), 2¹⁰ = 1024 sectors are uniquely addressable - matching the total memory size of 262,144 bytes ÷ 256 = 1024.
Can the AT29C020-70TC be used as a direct replacement for standard EPROMs like the 27C256?
The AT29C020-70TC is pin-compatible with 27C256 EPROMs in read mode (CE/OE/WE control matches standard EPROM timing), but differs critically in programming methodology and voltage requirements. Unlike the 27C256, which requires 12.5 V VPP for programming, the AT29C020-70TC uses 5 V-only commands and sector-based reprogramming. Thus, while it can replace EPROMs in read-only applications, firmware update logic must be redesigned to support sector erasure, DATA polling, and software protection sequences.
What is the purpose of the NC (No Connect) pin on the AT29C020-70TC TSOP package?
The NC pin on the AT29C020-70TC TSOP package is Pin 16, located in the top row (as shown in the TSOP Top View diagram on page 2). Per the Pin Configurations section, it is explicitly labeled "No Connect" and has no internal bonding or electrical function. It must remain unconnected in PCB layout - routing traces or applying solder to this pin may cause mechanical stress or unintended coupling, potentially affecting signal integrity on adjacent I/O lines.
AT29C020-70TC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29C020-70TC FAQ
1.How can I place an order for AT29C020-70TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-70TC 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 AT29C020-70TC reliable?
The price and inventory of AT29C020-70TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-70TC is usually 5 days.
3.What payment methods are accepted for AT29C020-70TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-70TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-70TC?
AT29C020-70TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-70TC 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 AT29C020-70TC?
For technical support, including AT29C020-70TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-70TC requirements.
6.How does Aetrix verify that AT29C020-70TC is sourced from the original manufacturer or authorized distributors?
All AT29C020-70TC 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 AT29C020-70TC meets industry standards.
7.What is the process for return or replacement of AT29C020-70TC?
All AT29C020-70TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-70TC, 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 AT29C020-70TC part is unused and in its original packaging.
Return procedure for AT29C020-70TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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