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Microchip Technology AT29C020-90PI
- Part No.:
- AT29C020-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C020-90PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,227
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Product details
Overview
AT29C020-90PI 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, and hardware/software data protection. It operates across industrial temperature range (−40°C to +85°C) and supports in-system reprogramming without high-voltage programming supplies.
For engineers reviewing the AT29C020-90PI datasheet, AT29C020-90PI pinout, AT29C020-90PI application, or AT29C020-90PI equivalent, key selection considerations include its 32-pin PDIP package, sector-based 256-byte programming architecture, boot block lockout capability, DATA polling and TOGGLE bit end-of-program detection, and compatibility with standard EPROM read interfaces.
Technical Context
The AT29C020-90PI implements a sector-erase/program architecture where each of 1024 sectors (256 bytes each) is independently reprogrammable via single-cycle erase-and-program operations. Internal address and data latches hold the full 256-byte sector during programming, freeing the bus for concurrent operations.
It integrates dual protection mechanisms: hardware-level VCC sensing (inhibits programming below 3.8 V), noise filtering on WE/CE inputs (<15 ns pulses ignored), and software-controlled data protection requiring a three-byte command sequence (AAh/55h/A0h at specific addresses) before any sector program operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling firmware storage for embedded controllers and BIOS code |
| Read Access Time | 90 ns max - defines worst-case latency for instruction fetch or data read in timing-critical systems |
| Sector Program Time | 10 ms typical - determines minimum time between successive sector writes in firmware update routines |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5 V logic systems |
| Endurance | >10,000 program/erase cycles per sector - supports field-upgradable firmware with moderate update frequency |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed or energy-sensitive applications |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics |
| Boot Blocks | Two 8 KB blocks (first/last) with independent lockout - secures bootloader code against accidental overwrite |
Pinout & Package
AT29C020-90PI is supplied in a 32-pin Plastic Dual Inline Package (PDIP), 0.600" wide (package code 32P6), with through-hole mounting and industry-standard pin spacing (2.54 mm).
| 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 for read data output or program data input; CMOS/TTL compatible |
| CE | Chip Enable | Active-low chip select; when high, device enters high-impedance standby mode (100 µA) |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low control for byte load and sector program initiation; must be high during read operations |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; enables internal VCC-sense protection |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal circuitry |
| NC | No Connect | Pin 1 (DIP top view) is unconnected; no internal bonding or function |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V Reprogramming | Eliminates need for external 12 V programming supplies, simplifying system power architecture and reducing BOM cost |
| DATA Polling & TOGGLE Bit | Enables real-time, non-blocking detection of program completion using I/O7 complement or I/O6 toggling - avoids fixed delays in firmware |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and noise filtering prevent spurious writes during power-up, brown-out, or EMI events |
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every program cycle - prevents accidental firmware corruption |
| Boot Block Lockout | Independent enable/disable of programming lock for first/last 8 KB - protects bootloader while allowing application updates elsewhere |
| Internal Sector Latching | 256-byte sector data and address are latched internally during program load - frees address/data bus for other tasks mid-program |
Applications
| Industrial PLC Firmware Storage | Embedded System Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with direct EPROM-compatible read interface; provides deterministic 90 ns access for instruction fetch in real-time control loops. Use Value: Industrial temperature rating (−40°C to +85°C) and >10,000 endurance cycles ensure reliable firmware retention over 10+ years of continuous operation. | Use Scenario: Hosting secure bootloader code in microcontroller-based medical devices requiring verified startup sequences and field-upgradable application firmware. IC Role / Device Role / Timing Role: Boot block-protected Flash memory holding immutable initialization code; accessed at power-on reset via standard address/data bus. Use Value: Independent 8 KB boot block lockout prevents corruption of critical startup routines while permitting updates to application partitions. |
| Legacy Industrial HMI Display Controller | Automotive Body Control Module (BCM) |
Use Scenario: Replacing obsolete EPROMs in human-machine interface displays used in heavy equipment, where board space and 5 V compatibility constrain redesign options. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement for 27C256-style EPROMs; supports identical read timing and bus interface signals (CE/OE/WE). Use Value: 90 ns access time and TTL/CMOS I/O compatibility allow drop-in substitution without timing or level-shifting modifications. | Use Scenario: Storing calibration tables and feature-enable flags in automotive BCMs subject to extended thermal cycling and vibration. IC Role / Device Role / Timing Role: Field-programmable nonvolatile memory for vehicle-specific configuration data; programmed during final assembly or dealer service. Use Value: Hardware VCC-sense and noise filtering ensure immunity to automotive electrical transients, preventing unintended writes during cranking or load dump. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV020B-90EC | 3.3 V core with 5 V tolerant I/O; 90 ns access; 100,000 endurance cycles; requires VPP = 12 V for sector erase | Designed for mixed-voltage systems; not 5 V–only; higher endurance but needs extra voltage rail | Select if migrating to lower-power 3.3 V design and can accommodate VPP generation |
| MX29LV020C-90P | 3.3 V supply only; 90 ns access; 100,000 cycles; no VPP required; supports CFI query mode | Requires full 3.3 V system; lacks 5 V compatibility and hardware VCC-sense protection | Prefer for new 3.3 V designs needing higher endurance and standardized command sets |
Compared with AM29LV020B-90EC and MX29LV020C-90P, the AT29C020-90PI uniquely delivers true 5 V–only operation with integrated VCC-sense and noise filtering-critical for legacy industrial upgrades where voltage rail changes are prohibited and EMI robustness is mandatory.
Availability
AT29C020-90PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded system bootloader memory, and legacy HMI display controller replacements requiring stable component supply and long-term obsolescence management.
Supply support for AT29C020-90PI 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.
The AT29C020-90PI belongs to Atmel's legacy 5 V Flash memory product line, designed specifically for industrial and automotive applications requiring in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the operating temperature range for the AT29C020-90PI?
The AT29C020-90PI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official Atmel datasheet (Rev. 0291N–FLASH–07/02), where the "-90PI" suffix explicitly denotes the industrial grade variant. Its performance parameters-including access time, standby current, and program timing-are guaranteed across this full range.
Does the AT29C020-90PI require a high-voltage programming supply?
No, the AT29C020-90PI does not require a high-voltage programming supply. As stated in the "Features" section and "Device Operation" description, it supports 5-volt-only reprogramming. All program and erase functions are executed using standard 5 V logic levels on CE, WE, and address/data lines-no external 12 V VPP rail is needed. This is a defining characteristic of the AT29C020-90PI versus older EPROM or UV-erasable devices.
How many sectors does the AT29C020-90PI have, and what is the size of each sector?
The AT29C020-90PI contains 1024 sectors, each 256 bytes in size. This is explicitly documented in the "Features" list and reinforced in the "Device Operation" section, which states that reprogramming occurs on a sector basis and that internal latches hold 256 bytes of data. The total memory capacity (262,144 bytes) divided by 256 bytes per sector confirms the 1024-sector count.
What methods are available to detect the end of a program cycle on the AT29C020-90PI?
The AT29C020-90PI provides two hardware-supported methods: DATA polling (monitoring complement-to-data state on I/O7) and TOGGLE bit detection (observing toggling on I/O6). Both are detailed in dedicated sections of the datasheet, including waveforms and timing specifications. These mechanisms eliminate the need for fixed software delays and enable efficient, event-driven firmware update routines for the AT29C020-90PI.
Can the boot blocks of the AT29C020-90PI be independently locked, and how is lockout verified?
Yes, the AT29C020-90PI features two independent 8 KB boot blocks (first and last 8 KB) with separately configurable programming lockout. Lockout status is verified via software product identification mode: reading address 00002H returns FEh if the lower boot block is unlocked or FFh if locked; reading 3FFF2H yields the same for the upper block. This verification method is specified in the "Boot Block Lockout Detection" section of the AT29C020-90PI datasheet.
AT29C020-90PI 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:
- 90 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
AT29C020-90PI FAQ
1.How can I place an order for AT29C020-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C020-90PI 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 AT29C020-90PI reliable?
The price and inventory of AT29C020-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C020-90PI is usually 5 days.
3.What payment methods are accepted for AT29C020-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C020-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C020-90PI?
AT29C020-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C020-90PI 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 AT29C020-90PI?
For technical support, including AT29C020-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C020-90PI requirements.
6.How does Aetrix verify that AT29C020-90PI is sourced from the original manufacturer or authorized distributors?
All AT29C020-90PI 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 AT29C020-90PI meets industry standards.
7.What is the process for return or replacement of AT29C020-90PI?
All AT29C020-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C020-90PI, 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 AT29C020-90PI part is unused and in its original packaging.
Return procedure for AT29C020-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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