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Microchip Technology AT49F040-90PI
- Part No.:
- AT49F040-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F040-90PI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,818
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Product details
Overview
AT49F040-90PI from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC used for nonvolatile program/data storage in embedded boot code and firmware applications. It features 90 ns read access time, 50 µs byte programming, 10-second chip erase, 16 KB boot block with hardware lockout, and CMOS standby current of 100 µA. Designed for industrial temperature range (−40°C to +85°C), it supports in-system reprogramming without high-voltage inputs.
For engineers reviewing the AT49F040-90PI datasheet, AT49F040-90PI pinout, AT49F040-90PI application, or AT49F040-90PI equivalent, key selection criteria include 32-pin PDIP package compatibility, 5V-only operation, boot sector protection logic, DATA polling/Toggle Bit status detection, and software-controlled chip erase via six-byte command sequence.
Technical Context
The AT49F040-90PI implements a parallel interface with address pins A0–A18, bidirectional I/O0–I/O7, and three control signals (CE, OE, WE) enabling EPROM-like read and byte-level write operations. Its internal command register interprets six-byte software sequences for chip erase, boot lockout enable, and product identification - all executed without external clocks.
It integrates hardware data protection including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses rejected on CE/WE), and dual-line bus contention prevention via independent CE/OE control. The optional 16 KB boot block (00000H–03FFFH) is permanently protected after lockout activation, while main memory (496 KB) remains fully reprogrammable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8 organization), supporting 19-bit addressing (A0–A18) |
| Read Access Time | 90 ns max - defines minimum bus cycle timing for reliable CPU read operations |
| Byte Programming Time | 50 µs typical - determines firmware update latency per byte during field reprogramming |
| Chip Erase Time | 10 seconds max - sets worst-case downtime during full memory reset before reprogramming |
| Boot Block Size | 16 KB (00000H–03FFFH) - reserves lowest-address region for secure bootloader code |
| Supply Current | 50 mA active / 100 µA CMOS standby - enables low-power suspend modes in battery-backed systems |
| Endurance | 10,000 program/erase cycles - specifies maximum field update count before wear-out risk |
Pinout & Package
AT49F040-90PI uses a 32-lead plastic dual inline package (PDIP), 0.600" wide, with standard DIP pin layout and through-hole mounting. Pin 1 is marked by notch or dot; pin numbering follows counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus accepting CPU or controller address lines; A0 least significant |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for read output or program input; high-impedance when disabled |
| CE | Chip Enable | Active-low chip select; must be low for any internal operation (read/write/erase) |
| OE | Output Enable | Active-low read control; enables data output only when CE is also low |
| WE | Write Enable | Active-low write strobe; latches address/data for programming or erase commands |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and I/O buffers; no high-voltage programming required |
| GND | Ground Reference | Signal and power return; decoupling capacitor required near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for dedicated programming voltage generators or level shifters in system design |
| DATA Polling & Toggle Bit | Enables real-time program/erase completion detection without polling overhead or timer dependencies |
| Hardware Boot Block Lockout | Prevents accidental overwrite of critical bootloader code after one-time software activation sequence |
| Internal Program Timer | Removes requirement for external timing circuitry during byte programming or chip erase cycles |
| Noise-Filtered Control Inputs | Rejects sub-15 ns glitches on CE/WE, improving reliability in electrically noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct CPU bus access for fast boot and field-upgradable firmware execution. Use Value: 10,000-cycle endurance and −40°C to +85°C rating ensure long-term reliability; boot block lockout prevents corruption of safety-critical startup routines. |
Use Scenario: Holding certified bootloader code and regulatory-compliant diagnostic firmware in portable medical instruments requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced write protection for first-stage initialization code verified prior to application load. Use Value: 16 KB locked boot sector (00000H–03FFFH) isolates immutable startup logic from field-updatable application partitions. |
| Telecom Base Station Configuration | Automotive Infotainment System BIOS |
|
Use Scenario: Retaining radio calibration tables, network registration data, and fail-safe recovery images in outdoor telecom equipment operating under thermal cycling stress. IC Role / Device Role / Timing Role: Industrial-grade Flash memory interfacing directly with microcontroller address/data buses for deterministic read latency (90 ns). Use Value: 100 µA CMOS standby current minimizes power draw during idle periods; software chip erase enables remote firmware rollback. |
Use Scenario: Hosting boot firmware and display driver initialization code in automotive head units where EEPROM endurance and speed are insufficient. IC Role / Device Role / Timing Role: Parallel Flash device acting as primary boot source for ARM-based SoCs, accessed via static memory controller with wait-state configuration. Use Value: 50 µs byte programming allows incremental updates to UI assets without full image reload; DATA polling avoids fixed timeout delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90EC | 4 Mbit (512K × 8), 90 ns access, 3.3 V core with 5 V I/O tolerance; requires VPP = 12 V for programming | Requires dual-supply design and high-voltage generation; not 5V-only compatible | Select only if system already provides 3.3 V logic and 12 V programming rail; incompatible drop-in replacement for AT49F040-90PI |
| SST39VF400A-90-4C-NHE | 4 Mbit (512K × 8), 90 ns access, 3.3 V operation only; no 5 V support; lacks boot block lockout feature | Cannot operate from 5 V supply; no hardware-protected boot sector; different command set | Use only in 3.3 V systems requiring lower active power; not suitable for legacy 5 V designs or secure bootloader use cases |
Compared with AM29LV040B-90EC and SST39VF400A-90-4C-NHE, the AT49F040-90PI uniquely delivers true 5V-only operation with integrated boot block lockout and no external VPP requirement - making it the sole option for cost-sensitive, single-rail industrial designs needing guaranteed bootloader integrity.
Availability
AT49F040-90PI is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and telecom infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49F040-90PI 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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for embedded systems.
The AT49F040-90PI belongs to Atmel's parallel Flash memory product line, designed specifically for cost-effective, 5V-only in-system reprogrammability in industrial and automotive boot applications.
FAQ
What is the operating temperature range for the AT49F040-90PI?
The AT49F040-90PI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table on page 11 of the official Atmel datasheet (Rev. 0998D–03/01), where the "-90PI" suffix explicitly denotes the industrial-grade version. The device maintains full functionality-including 90 ns read access and 50 µs byte programming-across this entire range.
Does the AT49F040-90PI require a high-voltage programming supply?
No, the AT49F040-90PI operates exclusively from a single 5.0 V ±10% supply for both read and programming functions. As stated in the Features section, it supports "5V Read" and "5V Reprogramming" with no VPP pin or external high-voltage generator required. Hardware data protection includes VCC sense that inhibits programming if supply drops below 3.8 V, ensuring safe operation within standard 5 V logic rails.
How is boot block protection enabled on the AT49F040-90PI?
Boot block protection on the AT49F040-90PI is enabled via a six-byte software command sequence written to specific addresses: load 0xAA to 5555H, 0x55 to 2AAAH, then 0x80 to 5555H, followed by 0xAA to 5555H, 0x55 to 2AAAH, and finally 0x40 to 5555H. Once executed, the 16 KB boot sector (00000H–03FFFH) becomes permanently write- and erase-protected. The AT49F040-90PI datasheet confirms this algorithm on page 10.
What package type does the AT49F040-90PI use?
The AT49F040-90PI uses a 32-lead plastic dual inline package (PDIP), designated as "32P6" in Atmel's ordering information. This is a 0.600-inch wide, through-hole mount package with standard DIP pinout and JEDEC MS-001 compliant dimensions. The "PI" suffix in the part number explicitly identifies the PDIP industrial variant, distinct from PLCC ("J") or TSOP ("T") versions.
Can the AT49F040-90PI be used as a direct replacement for EPROMs like the 27C040?
The AT49F040-90PI is pin-compatible with the 27C040 EPROM in 32-pin PDIP format and shares identical address/data/control pin assignments (A0–A18, I/O0–I/O7, CE, OE, WE, VCC, GND). However, it is not functionally identical: unlike EPROMs, it requires software command sequences for programming/erase and lacks UV-erasability. Its read behavior matches EPROMs, but write operations demand protocol-aware firmware - confirmed in the Device Operation section of the AT49F040-90PI datasheet.
AT49F040-90PI 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:
- 4Mbit
- Memory Organization:
- 512K 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
AT49F040-90PI FAQ
1.How can I place an order for AT49F040-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-90PI 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 AT49F040-90PI reliable?
The price and inventory of AT49F040-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-90PI is usually 5 days.
3.What payment methods are accepted for AT49F040-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-90PI?
AT49F040-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-90PI 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 AT49F040-90PI?
For technical support, including AT49F040-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-90PI requirements.
6.How does Aetrix verify that AT49F040-90PI is sourced from the original manufacturer or authorized distributors?
All AT49F040-90PI 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 AT49F040-90PI meets industry standards.
7.What is the process for return or replacement of AT49F040-90PI?
All AT49F040-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-90PI, 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 AT49F040-90PI part is unused and in its original packaging.
Return procedure for AT49F040-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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