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Microchip Technology AT49F040-70TI
- Part No.:
- AT49F040-70TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F040-70TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
AT49F040-70TI from Atmel is a 4-megabit (512K × 8) 5V-only parallel Flash memory IC used for nonvolatile program/data storage in embedded boot code and firmware applications. It features 55 ns read access time, 10-second chip erase, 50 µs/byte programming, 16 KB boot block with hardware lockout, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F040-70TI datasheet, AT49F040-70TI pinout, AT49F040-70TI application, or AT49F040-70TI equivalent, key selection criteria include boot-sector protection integrity, 5V-only in-system reprogrammability, industrial-grade timing compliance (tACC = 70 ns), and PLCC-32 package compatibility with legacy socketed designs.
Technical Context
The AT49F040-70TI implements a single-voltage 5V-only architecture with internal command register control for byte programming and software chip erase. Its memory array is partitioned into a 16 KB bottom-boot sector (00000H–03FFFH) and 496 KB main array, both accessible via standard EPROM-like read protocol (CE/OE low, WE high).
Programming uses six-byte command sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h → …) to initiate erase or lockout; DATA polling on I/O7 and toggle-bit detection on I/O6 provide cycle completion feedback without external timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full firmware images up to 512 KB in 8-bit bus systems |
| Read Access Time | 70 ns - meets timing for 14 MHz bus operation with standard address setup/hold margins |
| Byte Programming Time | 50 µs - enables rapid field updates of small configuration blocks without system downtime |
| Chip Erase Time | 10 seconds - deterministic full-array reset suitable for production line reprogramming |
| Boot Block Size | 16 KB (00000H–03FFFH) - isolates critical boot loader code from accidental overwrite during application updates |
| Operating Voltage | 5 V ±10% - eliminates need for auxiliary voltage rails in legacy 5V microcontroller systems |
| Temperature Range | -40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure |
Pinout & Package
AT49F040-70TI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package with JEDEC MS-016 AE outline, 1.27 mm pitch, and 11.5 mm × 14.0 mm footprint. Pin 1 is marked by index notch at top-left corner (viewed from top).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0 least significant bit |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K family microcontrollers |
| CE | Chip Enable | Active-low global select; must be low for any read/write operation; enables bus contention control |
| OE | Output Enable | Active-low output gate; allows data read while CE remains asserted for multi-chip decoding |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge for programming cycles |
| VCC | Power Supply | +5 V supply; decoupling capacitor required within 10 mm of pin per layout guidelines |
| GND | Ground Reference | Digital ground return; separate analog ground not required due to CMOS-only design |
Key Features
| Feature | Design Value |
|---|---|
| Bottom Boot Block Lockout | Hardware-enforced write protection for 16 KB at 00000H–03FFFH prevents corruption of boot loader during field firmware updates |
| DATA Polling Detection | I/O7 returns complement of programmed byte until completion, enabling host CPU to poll instead of using fixed delays |
| Toggle Bit Feedback | I/O6 toggles during erase/program cycles, providing asynchronous status indication without bus arbitration overhead |
| VCC Sense Protection | Automatic inhibition of programming if VCC drops below 3.8 V, preventing partial writes during power brownouts |
| Software Command Set | Standardized 6-byte unlock/erase/lock sequences eliminate need for external high-voltage programmers |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Backup |
|---|---|
Use Scenario: Storing ladder logic and I/O configuration in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed 70 ns read access to support real-time scan cycle execution on 12 MHz microcontrollers. Use Value: Industrial temperature rating (-40°C to +85°C) and boot-block lockout ensure reliable boot sequence integrity after thousands of power cycles. | Use Scenario: Providing secondary BIOS image storage in desktop motherboards for recovery after failed primary flash updates. IC Role / Device Role / Timing Role: Standby-mode backup memory holding validated firmware copy; accessed only during POST error recovery. Use Value: 100 µA CMOS standby current minimizes power draw during normal operation; 5V-only interface simplifies board-level voltage regulation. |
| Telecom Line Card Boot Loader | Medical Device Configuration Storage |
Use Scenario: Hosting boot code for DSP-based line cards in carrier-class DSLAMs requiring hot-swap capability and field-upgradable firmware. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; executes before loading application firmware from external storage. Use Value: Bottom-boot architecture ensures immediate execution from lowest address; 10,000 write cycles support frequent field calibration updates. | Use Scenario: Retaining device-specific calibration constants and safety-critical configuration parameters in FDA-regulated diagnostic equipment. IC Role / Device Role / Timing Role: Secure parameter storage with hardware write lockout preventing unauthorized modification of calibrated sensor offsets. Use Value: Boot block lockout feature provides tamper-evident protection; 5V-only operation avoids mixed-voltage design complexity in isolated medical subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70EC | 4 Mbit (512K × 8), 3.3 V core with 5 V I/O tolerance; 70 ns read; no dedicated boot block | Requires level-shifting in pure 5V systems; lacks hardware boot-sector lockout | Select when migrating to lower-power 3.3 V systems with existing 5V bus interfaces |
| SST39VF400A-70-4C-NHE | 4 Mbit (512K × 8), 3.3 V only; 70 ns read; top-boot configuration (boot block at highest addresses) | Incompatible boot block location requires PCB redesign for address mapping; no 5V operation | Choose for new 3.3 V designs where top-boot architecture aligns with bootloader memory map |
Compared with AM29LV040B-70EC and SST39VF400A-70-4C-NHE, the AT49F040-70TI uniquely delivers 5V-only operation with bottom-boot lockout in PLCC-32 - preserving legacy socket compatibility while ensuring boot code immutability without external logic.
Availability
AT49F040-70TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, telecom line card boot loaders, and medical device configuration storage requiring stable component supply over extended product lifecycles.
Supply support for AT49F040-70TI 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT49F040-70TI belongs to Atmel's 5V Flash memory product line, engineered specifically for in-system reprogrammability in legacy 5V embedded systems requiring robust boot code protection and long-term data retention.
FAQ
What is the operating temperature range for the AT49F040-70TI?
The AT49F040-70TI is rated for industrial operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table on page 5 of the official Atmel datasheet (Rev. 0998D–03/01), where AT49F040-70TI is explicitly listed under the Industrial column alongside its 70 ns access time and 5V ±10% supply requirements. The AT49F040-70TI's thermal qualification supports deployment in harsh environments such as factory floors and outdoor telecom cabinets.
Does the AT49F040-70TI support in-system programming without high voltage?
Yes, the AT49F040-70TI supports full in-system programming using only 5V - no external 12V or 12.5V programming voltage is required. As stated in the "Features" section and "Device Operation" description, it uses five-volt-only commands for all operations, including chip erase and byte programming. The AT49F040-70TI achieves this through an internal command register and on-chip charge pump, enabling field firmware updates directly via the host microcontroller's parallel bus without dedicated programmers.
How is boot block protection implemented on the AT49F040-70TI?
The AT49F040-70TI implements boot block protection via a hardware-enforced lockout feature for the 16 KB region at addresses 00000H–03FFFH. Once enabled using the six-byte command sequence (5555h/AAh → 2AAAh/55h → 5555h/80h → 5555h/AAh → 2AAAh/55h → 5555h/40h), the AT49F040-70TI permanently disables erasure and programming of that sector. The lockout status can be verified by reading I/O0 during software product identification mode, as detailed on page 3 of the datasheet.
What package type is used for the AT49F040-70TI?
The AT49F040-70TI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as 32J in Atmel's ordering information (page 11). Its mechanical dimensions conform to JEDEC standard MS-016 AE, with a 1.27 mm lead pitch and 11.5 mm × 14.0 mm body size. The AT49F040-70TI's PLCC package provides socket compatibility for prototyping and rework, distinguishing it from PDIP and TSOP variants in the same family.
Can the AT49F040-70TI be used as a direct replacement for EPROMs like the 27C040?
The AT49F040-70TI is pin-compatible with the 27C040 EPROM in PLCC-32 packaging and shares identical address/data bus signaling during read operations (CE/OE low, WE high). However, the AT49F040-70TI requires specific software command sequences for programming and erase - unlike UV-erasable EPROMs - and lacks the 27C040's windowed ceramic package. For read-only legacy systems, the AT49F040-70TI functions as a drop-in replacement; for reprogramming, host firmware must implement the AT49F040-70TI's command protocol.
AT49F040-70TI 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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- 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
AT49F040-70TI FAQ
1.How can I place an order for AT49F040-70TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-70TI 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 AT49F040-70TI reliable?
The price and inventory of AT49F040-70TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-70TI is usually 5 days.
3.What payment methods are accepted for AT49F040-70TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-70TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-70TI?
AT49F040-70TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-70TI 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 AT49F040-70TI?
For technical support, including AT49F040-70TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-70TI requirements.
6.How does Aetrix verify that AT49F040-70TI is sourced from the original manufacturer or authorized distributors?
All AT49F040-70TI 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 AT49F040-70TI meets industry standards.
7.What is the process for return or replacement of AT49F040-70TI?
All AT49F040-70TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-70TI, 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 AT49F040-70TI part is unused and in its original packaging.
Return procedure for AT49F040-70TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040-70TI Tags
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