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Microchip Technology AT49F002-90PI
- Part No.:
- AT49F002-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002-90PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,987
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Product details
Overview
AT49F002-90PI from Atmel is a 5V-only, 2-Mbit (256K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs/byte programming, 10-second erase cycle, and sector-based architecture including a 16K-byte boot block with programmable lockout. It serves as nonvolatile program storage in embedded microcontroller boot loaders and firmware update modules.
For engineers reviewing the AT49F002-90PI datasheet, AT49F002-90PI pinout, AT49F002-90PI application, or AT49F002-90PI equivalent, key selection criteria include its 5V-only operation, boot block write protection, DATA polling/Toggle Bit end-of-program detection, and compatibility with standard EPROM-style CE/OE/WE bus control in legacy 8-bit systems.
Technical Context
The AT49F002-90PI implements a command-register-based Flash architecture with software-controlled sector erase and byte programming. Its internal logic interprets six-cycle command sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) to initiate chip or sector erase, enabling selective updates without full reprogramming.
It features dual-line bus control (CE + OE) for contention-free read access and hardware data protection via VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and input state validation (OE low/CE high/WE high disables writes). The RESET pin supports both system reset and 12V override of boot block lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Mbit (262,144 × 8), organized as 256K bytes for direct byte-addressable firmware storage |
| Read Access Time | 90 ns - determines maximum instruction fetch rate in 8-bit microcontrollers running at ≤11 MHz |
| Byte Programming Time | 10 µs typical - enables field firmware patching with minimal system downtime |
| Erase Cycle Time | 10 seconds - defines minimum latency for updating parameter blocks or main memory sectors |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed timing delays in host firmware |
| Write Endurance | 10,000 program/erase cycles - qualifies for industrial firmware update applications with multi-year service life |
| Power Dissipation | 50 mA active / 100 µA CMOS standby - supports low-power modes in battery-backed systems |
Pinout & Package
AT49F002-90PI is supplied in a 32-pin, 0.600" wide plastic DIP (PDIP) package (package code 32P6), with 0.1" lead pitch and through-hole mounting. Pin 1 is index-marked; pins 17–32 are on the right side, pins 1–16 on the left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-byte addressing (A0–A15 for byte offset, A16–A17 for bank selection in extended maps) |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read output |
| OE | Output Enable | Active-low output gate; used with CE to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K family microcontrollers |
| RESET | Reset & Boot Override | Logic-high = normal operation; 12V pulse enables boot block reprogramming despite lockout |
| VCC / GND | Power Supply | 5V ±10% supply; decoupling required within 1 cm of pins to maintain 90 ns timing integrity |
| DC | No Connect | Pin 1 on DIP package - must remain unconnected; floating or tied to GND causes undefined behavior |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | One 16K-byte boot block + two 8K-byte parameter blocks + two main memory blocks (96K/128K) enables modular firmware partitioning and safe field updates |
| Boot Block Lockout | Hardware-enforced write protection for secure boot code; activated via 6-cycle command sequence and overridden only by 12V RESET pulse |
| Hardware Data Protection | VCC sense, noise filtering, and control-line validation prevent accidental writes during power transients or EMI events |
| DATA Polling & Toggle Bit | Dual asynchronous end-of-program indicators eliminate polling loops and reduce host CPU overhead during flash operations |
| 5V-Only Operation | Eliminates need for 12V programming supplies or level shifters, simplifying board design and reducing BOM cost |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot Loader |
|---|---|
Use Scenario: Storing firmware and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory holding bootloader, runtime kernel, and user-defined ladder logic; accessed via 8-bit parallel bus during cold start and firmware upgrades. Use Value: 10,000 write cycles and -40°C to +85°C industrial temp range ensure reliable field updates over 10+ years without recalibration or replacement. | Use Scenario: Providing boot code for 8051- or Z80-based medical diagnostic instruments requiring certified, tamper-resistant startup routines. IC Role / Device Role / Timing Role: Secure boot memory with lockout-enabled 16K-byte boot block; hosts verified initialization code that loads application firmware from external media. Use Value: Boot block lockout prevents unauthorized modification of safety-critical startup sequences, meeting IEC 62304 Class C software requirements. |
| Automotive Diagnostic Tool Memory | Point-of-Sale Terminal Parameter Storage |
Use Scenario: Holding vehicle-specific diagnostic protocols and calibration tables in handheld OBD-II scanners deployed across diverse automotive platforms. IC Role / Device Role / Timing Role: Field-updatable parameter memory storing protocol stacks and ECU response templates; updated via USB-connected host PC using sector-erase commands. Use Value: Sector architecture allows independent erasure of parameter blocks without disturbing main diagnostic engine code, minimizing update risk and downtime. | Use Scenario: Storing tax tables, language packs, and merchant-specific configurations in retail POS terminals subject to frequent regional regulatory changes. IC Role / Device Role / Timing Role: Reprogrammable firmware storage accessed during terminal boot and background OTA updates; managed by ARM Cortex-M host MCU via parallel interface. Use Value: 90 ns read access enables fast UI initialization, while 10 µs/byte programming supports sub-second configuration updates during store closing procedures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-90EC | 3V/5V dual-voltage operation; 90 ns access; 2 Mbit; no RESET pin for boot override | Lacks 12V boot block override; requires separate voltage regulation for 3V logic domains | Select when mixed-voltage system design demands 3V I/O compatibility and boot override is not required |
| SST39VF020-90-4C-NHE | 5V-only; 90 ns access; 2 Mbit; no dedicated RESET pin; uses different command set (AAh/55h/A0h) | Boot block protection implemented via software flag only; no hardware-level 12V override capability | Select when cost sensitivity outweighs need for hardware-enforced boot security and field recovery capability |
Compared with AM29LV002BT-90EC and SST39VF020-90-4C-NHE, the AT49F002-90PI uniquely combines 5V-only simplicity, hardware boot lockout with 12V override, and EPROM-compatible timing-making it optimal for legacy 8-bit systems requiring field-recoverable, tamper-resistant boot code.
Availability
AT49F002-90PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot loader implementations, and automotive diagnostic tool memory requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002-90PI 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 devices for industrial, automotive, and consumer applications.
The AT49F002 series was designed as a drop-in EPROM replacement offering in-system reprogrammability for 8-bit embedded systems needing field-upgradable firmware without high-voltage programming infrastructure.
FAQ
What is the operating temperature range for the AT49F002-90PI?
The AT49F002-90PI is rated for commercial operation from 0°C to +70°C. Its PDIP package and internal design meet this specification under continuous 5V supply and standard PCB layout practices. This range suits office equipment, test instrumentation, and non-harsh-environment embedded systems. For extended temperature operation down to -40°C, the AT49F002-90PI variant is not qualified; instead, the AT49F002-90JI (industrial grade) should be selected.
Does the AT49F002-90PI support hardware write protection for the boot sector?
Yes, the AT49F002-90PI supports hardware-enforced boot block lockout via a 6-cycle command sequence. Once enabled, the 16K-byte boot sector (00000h–03FFFh) becomes permanently protected against erase or programming at 5V levels. Protection can only be lifted by applying 12V ±0.5V to the RESET pin - a feature absent in competing Flash devices like the SST39VF020 and critical for secure boot recovery in deployed systems.
How does the AT49F002-90PI detect completion of a byte programming cycle?
The AT49F002-90PI provides two hardware methods: DATA polling (reading the programmed byte returns its complement on I/O7 until complete) and Toggle Bit (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both mechanisms allow the host microcontroller to avoid fixed timing delays and respond dynamically - a key advantage over older UV-EPROMs and many single-voltage Flash alternatives lacking real-time status feedback.
Can the AT49F002-90PI be used as a direct replacement for standard EPROMs like the 27C256?
Yes, the AT49F002-90PI is pin-compatible with the 27C256 EPROM in 32-pin DIP packages and uses identical CE/OE/WE control signaling for read operations. Its 90 ns access time matches common 27C256-90 variants, and it maintains high-impedance outputs when deselected. However, programming requires command sequences instead of UV erasure - so host firmware must implement the 6-cycle erase and 4-cycle program protocols defined in the AT49F002-90PI datasheet.
What is the purpose of the DC (Don't Connect) pin on the AT49F002-90PI?
The DC pin (Pin 1) on the AT49F002-90PI's 32-pin PDIP package is explicitly designated as "Don't Connect" and must remain unconnected - neither tied to GND nor VCC. Connecting it risks undefined device behavior, including failed command recognition or spurious writes. This pin exists due to package pinout alignment across the AT49F002(N)(T) family but has no internal connection in the AT49F002-90PI silicon die.
AT49F002-90PI 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:
- 50µs
- 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
AT49F002-90PI FAQ
1.How can I place an order for AT49F002-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-90PI 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 AT49F002-90PI reliable?
The price and inventory of AT49F002-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-90PI is usually 5 days.
3.What payment methods are accepted for AT49F002-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-90PI?
AT49F002-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-90PI 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 AT49F002-90PI?
For technical support, including AT49F002-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-90PI requirements.
6.How does Aetrix verify that AT49F002-90PI is sourced from the original manufacturer or authorized distributors?
All AT49F002-90PI 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 AT49F002-90PI meets industry standards.
7.What is the process for return or replacement of AT49F002-90PI?
All AT49F002-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-90PI, 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 AT49F002-90PI part is unused and in its original packaging.
Return procedure for AT49F002-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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