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Microchip Technology AT29C020-70TI
- Part No.:
- AT29C020-70TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C020-70TI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
AT29C020-70TI from Atmel is a 2-megabit (256K × 8) 5V-only Flash memory IC used for nonvolatile code and data storage in embedded systems, supporting in-system reprogramming via sector erase-and-program. It delivers 70 ns read access time, 10 ms sector program cycle, 10,000 write/erase endurance, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT29C020-70TI datasheet, AT29C020-70TI pinout, AT29C020-70TI application, or AT29C020-70TI equivalent, this page provides verified technical context, pin-level design meaning, boot-block lockout behavior, DATA polling and TOGGLE bit status detection, and industrial-grade supply chain support for legacy system maintenance and industrial controller upgrades.
Technical Context
The AT29C020-70TI implements sector-based Flash architecture with 1024 × 256-byte sectors, internal address/data latches, and autonomous erase-then-program sequencing controlled by an on-chip timer. Its dual-line chip enable (CE) and output enable (OE) logic enables bus contention avoidance in shared-memory systems.
It supports three hardware-protected operation modes: standard read (CE/OE low, WE high), byte load (WE or CE pulse with OE high), and sector program (CE/WE low, OE high). Software data protection requires a 3-byte command sequence (AAh/55h/A0h at 5555h/2AAAh/5555h), while boot block lockout uses a 7-command algorithm targeting 00000h and 3FFFFh addresses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8-bit words), organized as 256K bytes for direct byte-addressable access in microcontroller boot loaders. |
| Read Access Time | 70 ns - enables direct execution from Flash (XIP) in 8–12 MHz microcontrollers without wait states. |
| Sector Size | 256 bytes - matches typical firmware update granularity and allows selective reprogramming without full chip erase. |
| Program Cycle Time | 10 ms per sector - deterministic timing for host firmware to schedule background updates without CPU blocking. |
| Endurance | >10,000 write/erase cycles per sector - supports field-upgradable industrial firmware with multi-year service life. |
| Supply Voltage | 5 V ±10% - compatible with legacy 5V TTL/CMOS buses and eliminates need for voltage translators. |
| Temperature Range | -40°C to +85°C - qualified for industrial control panels, motor drives, and outdoor metering equipment. |
Pinout & Package
AT29C020-70TI is packaged in a 32-lead Thin Small Outline Package (TSOP, Type I, package code 32T), measuring 20 mm × 8 mm × 1.2 mm, with gull-wing leads and JEDEC MO-142 BD compliance. Pin 1 identifier is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus: A0–A7 select byte within 256-byte sector; A8–A17 select sector (0–1023); no A18 required for 256K capacity. |
| I/O0–I/O7 | Bidirectional Data Bus | True 8-bit data path: outputs valid during read (CE/OE low); inputs latched on WE/CE falling edge during byte load. |
| CE | Chip Enable | Active-low device select: when high, forces outputs to high-impedance and inhibits all internal operations including programming. |
| OE | Output Enable | Active-low read control: must be low with CE low to assert data; high during programming to prevent bus conflict. |
| WE | Write Enable | Active-low control for byte loading and sector programming initiation; toggling within 150 µs enables sequential byte entry into latch. |
| VCC | Power Supply | +5 V ±10% main supply: powers core logic and charge pumps; internal VCC sense disables programming if below 3.8 V. |
| GND | Ground Reference | Signal and power return: decoupling capacitor (0.1 µF) required within 10 mm of VCC/GND pins for stable sector programming. |
| NC | No Connect | Unbonded pin (position 1 in TSOP): must remain unconnected; floating or tied to GND/VCC causes undefined behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent 8K-byte boot blocks | Enables secure firmware startup: lower block (0x00000–0x01FFF) and upper block (0x3E000–0x3FFFF) can be individually locked to prevent accidental overwrite of bootloader code. |
| Hardware + software data protection | Prevents unintended writes via VCC sensing (<3.8 V), 5 ms power-on delay, noise filtering (<15 ns pulses rejected), and 3-byte unlock sequence - critical for power-cycling environments. |
| DATA polling (I/O7) and TOGGLE bit (I/O6) | Allows real-time program completion detection without timers: host reads I/O7 until complement-to-data appears, or monitors I/O6 toggling until it stabilizes. |
| Single-cycle sector erase-and-program | Eliminates external erase step: host loads 256 bytes then triggers automatic internal erase followed by programming - reduces firmware complexity and update latency. |
| CMOS standby current ≤100 µA | Supports low-power modes in battery-backed systems: device draws negligible current when CE is high, enabling months-long retention in energy-constrained applications. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot Memory |
|---|---|
Use Scenario: Storing ladder logic programs and configuration data in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level update capability; 70 ns read speed supports real-time scan cycle execution without wait states. Use Value: Enables field firmware patches via serial port without replacing PCB; boot block lockout prevents corruption of safety-critical initialization routines. | Use Scenario: Holding BIOS/bootloader code in 1990s–2000s industrial HMIs, CNC controllers, and telecom line cards using 8051 or Z80 derivatives. IC Role / Device Role / Timing Role: Primary boot ROM replacement for EPROM sockets; 5V-only interface eliminates UV-eraser dependency and socket wear. Use Value: Reduces maintenance downtime: technicians reprogram in-circuit using standard ISP headers instead of removing chips for UV erasure and gang programming. |
| Secure Metering Code Storage | Automotive Diagnostic Module Memory |
Use Scenario: Storing tamper-resistant firmware and calibration tables in smart electricity/water meters certified to IEC 62056 standards. IC Role / Device Role / Timing Role: Protected code storage with software data protection enabled; boot blocks hold cryptographic keys and anti-tamper logic. Use Value: Prevents unauthorized firmware modification: 3-byte unlock sequence and VCC-sense inhibit ensure writes only occur during authenticated, powered-stable sessions. | Use Scenario: Holding OBD-II diagnostic application code and vehicle-specific parameter sets in aftermarket engine control modules operating under under-hood thermal stress. IC Role / Device Role / Timing Role: Industrial-temperature Flash memory interfaced to 8-bit MCUs; 10,000-cycle endurance supports repeated calibration updates over 10+ year vehicle life. Use Value: Eliminates EEPROM bottlenecks: 10 ms sector writes are 10× faster than typical EEPROM byte writes, accelerating recalibration workflows during service events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70EI | 4 Mbit density, 3.0–3.6 V supply, 70 ns access, 128K × 32 organization; lacks boot block lockout and software data protection. | Requires level-shifting for 5V systems; suited for newer 3.3V designs where higher density justifies redesign. | Select only if migrating to 3.3V architecture and needing >2 Mbit capacity; not drop-in compatible due to voltage and protection feature gaps. |
| MX29LV040CTTI-70G | 4 Mbit, 3.0–3.6 V, 70 ns, includes CFI query mode and 64-byte page programming; no boot block lockout or 5V compatibility. | Designed for PC BIOS and embedded Linux kernels; incompatible with 5V buses and legacy 8-bit MCU address/data muxing. | Use only in new 3.3V designs requiring JEDEC CFI compliance; requires PCB layout changes and driver stack updates. |
Compared with AM29LV040B-70EI and MX29LV040CTTI-70G, the AT29C020-70TI uniquely retains 5V operation, boot block security, and software data protection - making it irreplaceable for maintaining legacy industrial systems without hardware redesign.
Availability
AT29C020-70TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot memory, secure metering code storage, and automotive diagnostic module memory requiring stable component supply across extended product lifecycles.
Supply support for AT29C020-70TI 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 for industrial and automotive markets.
The AT29C020-70TI belongs to Atmel's legacy 5V Flash memory product line, designed specifically for in-system reprogrammability in cost-sensitive, long-lifecycle industrial control and instrumentation applications.
FAQ
What is the maximum operating temperature range for the AT29C020-70TI?
The AT29C020-70TI is rated for industrial temperature operation from -40°C to +85°C. This specification is validated per the Absolute Maximum Ratings table and DC/AC Operating Range section of the official Atmel datasheet (Rev. 0291N–FLASH–07/02). The "TI" suffix explicitly denotes the industrial grade, distinguishing it from commercial-grade variants like AT29C020-70JC.
Does the AT29C020-70TI support true 5V-only programming without external high-voltage supplies?
Yes, the AT29C020-70TI performs all programming operations using only a single 5V ±10% supply. Internal charge pumps generate necessary high voltages for Flash cell tunneling, eliminating the need for external 12V programming supplies. This is confirmed in the "Features" section and "Device Operation" subsection describing sector programming.
How does the boot block lockout feature work on the AT29C020-70TI?
The AT29C020-70TI contains two independent 8K-byte boot blocks - one at addresses 0x00000–0x01FFF (lower) and another at 0x3E000–0x3FFFF (upper). Lockout is enabled via a 7-command software algorithm; once activated, those blocks become permanently read-only. Status is verified by reading 0x00002H (lower) or 0x3FFF2H (upper): FEh means unlocked, FFh means locked.
Can the AT29C020-70TI be used as a direct replacement for standard EPROMs like the 27C020?
Yes, the AT29C020-70TI is pin-compatible with 27C020 EPROMs in 32-pin PDIP, PLCC, and TSOP packages and shares identical address/data bus timing for read operations. However, it requires different write protocols (sector-based vs. byte-wise) and lacks UV-erasability - so existing EPROM programmers cannot be reused without firmware adaptation.
What methods are available to detect the end of a program cycle on the AT29C020-70TI?
The AT29C020-70TI provides two hardware-confirmed methods: DATA polling (monitor I/O7 until it returns true data instead of complement) and TOGGLE bit detection (monitor I/O6 until toggling stops). Both are defined in the "DATA POLLING" and "TOGGLE BIT" sections of the datasheet and require no external components or timers.
AT29C020-70TI 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
AT29C020-70TI FAQ
1.How can I place an order for AT29C020-70TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-70TI 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 AT29C020-70TI reliable?
The price and inventory of AT29C020-70TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-70TI is usually 5 days.
3.What payment methods are accepted for AT29C020-70TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-70TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-70TI?
AT29C020-70TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-70TI 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 AT29C020-70TI?
For technical support, including AT29C020-70TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-70TI requirements.
6.How does Aetrix verify that AT29C020-70TI is sourced from the original manufacturer or authorized distributors?
All AT29C020-70TI 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 AT29C020-70TI meets industry standards.
7.What is the process for return or replacement of AT29C020-70TI?
All AT29C020-70TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-70TI, 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 AT29C020-70TI part is unused and in its original packaging.
Return procedure for AT29C020-70TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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