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Microchip Technology AT49F040A-70JI-T
- Part No.:
- AT49F040A-70JI-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040A-70JI-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
AT49F040A-70JI-T from Atmel is a 5V-only, 4 Mbit (512K × 8) in-system reprogrammable Flash memory IC with 55 ns read access time, 20 µs/byte programming, 6-second sector erase, and 10,000 write cycles - used for boot code storage and firmware updates in industrial microcontroller systems.
For engineers reviewing the AT49F040A-70JI-T datasheet, AT49F040A-70JI-T pinout, AT49F040A-70JI-T application, or AT49F040A-70JI-T equivalent, key selection criteria include its 32-lead PLCC package, boot block lockout feature, DATA polling/Toggle Bit end-of-program detection, and compatibility with standard EPROM-like CE/OE/WE control logic.
Technical Context
The AT49F040A-70JI-T implements a sector-architected Flash array with one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and eight main memory blocks (one 32K + seven 64K). It uses internal command register-based programming and erase control without external high-voltage inputs.
Its operation relies on standard microprocessor timing: address latched on falling edge of CE or WE, data latched on rising edge; supports hardware data protection via VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and CE/OE/WE state-based program inhibition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity MCUs |
| Read Access Time | 70 ns max - meets timing requirements for 14 MHz bus interfaces |
| Byte Programming Time | 20 µs typical - enables fast field firmware patching without system downtime |
| Sector Erase Time | 6 seconds max - allows selective reprogramming of parameter or application blocks |
| Write Endurance | 10,000 cycles - supports long-term field update capability in industrial controllers |
| Standby Current | 70 µA CMOS - minimizes power draw during sleep modes in battery-backed systems |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary voltage rails in legacy 5V designs |
| Temperature Range | −40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
AT49F040A-70JI-T is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE compliant, with 1.27 mm pitch and 12.45 mm × 14.95 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A18 don't care in command sequences |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with standard microprocessor data buses; supports DATA polling on I/O7 and Toggle Bit on I/O6 |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; controls address/data latch timing in programming |
| OE | Output Enable | Active-low output control; high-Z when asserted high, preventing bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data during byte programming and command entry |
| VCC | Power Supply | +5.0 V ±10% supply; device inhibits programming if VCC drops below 3.8 V |
| GND | Ground Reference | Signal and power ground reference; required for stable read/write margins and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte (00000H–03FFFH) sector permanently protected after command sequence - secures bootloader integrity against accidental overwrite |
| DATA Polling | I/O7 returns complement of programmed data until completion, then true data - enables real-time program status monitoring without timers or interrupts |
| Toggle Bit Detection | I/O6 toggles during program/erase; stops when complete - provides hardware-agnostic end-of-cycle flag for any host controller |
| Sector Architecture | 1 boot + 2 parameter + 8 main memory blocks - allows granular firmware updates without erasing critical boot or calibration data |
| Hardware Data Protection | VCC sense, noise filtering, and CE/OE/WE state validation - prevents spurious writes due to power instability or EMI |
Applications
| Industrial PLC Firmware Storage | Embedded Bootloader Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory providing 55 ns read access for deterministic scan-cycle execution and 20 µs byte programming for over-the-air firmware patches. Use Value: Boot block lockout ensures bootloader remains intact during field updates; 10,000 write cycles support multi-year maintenance intervals without memory wear-out. | Use Scenario: Hosting secure startup code for ARM Cortex-M or 8051-based embedded systems requiring verified boot and runtime firmware integrity checks. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; supports hardware-protected read/program operations synchronized to system clock via CE/OE/WE handshaking. Use Value: Sector erase capability isolates bootloader (boot block) from application code (main blocks), enabling safe dual-bank firmware upgrades without risk of bricking. |
| Automotive Diagnostic Module Storage | Medical Device Configuration Memory |
Use Scenario: Retaining diagnostic protocol stacks and calibration tables in OBD-II modules exposed to automotive-grade thermal cycling and vibration. IC Role / Device Role / Timing Role: Field-updatable Flash memory interfacing directly to microcontroller address/data bus; operates across −40°C to +85°C with <70 µA standby current. Use Value: Green (Pb/halide-free) PLCC packaging complies with automotive RoHS requirements; 6-second sector erase enables rapid recalibration data refresh without full reflash delays. | Use Scenario: Storing FDA-cleared device configuration profiles, sensor calibration offsets, and audit logs in portable medical instruments requiring traceable, tamper-resistant memory. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware-enforced boot block protection and DATA polling for deterministic firmware verification during power-on self-test. Use Value: 10,000 write cycles exceed typical device lifecycle; CMOS standby current <70 µA extends battery life in portable diagnostics equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70JCI | 4 Mbit, 70 ns, 3.3 V core with 5 V I/O tolerance; requires VPP = 12 V for programming | Not single-voltage - needs charge pump or external 12 V rail; incompatible with pure 5 V systems | Select only if migrating to lower-power 3.3 V core architecture and external VPP is available |
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns, 3.3 V operation; no VPP required but lacks boot block lockout feature | Requires software-managed sector protection; no hardware-enforced boot code immutability | Prefer where 3.3 V supply is mandatory and bootloader security is handled at firmware level |
Compared with AM29LV040B-70JCI and SST39VF400A-70-4C-NHE, the AT49F040A-70JI-T uniquely delivers true 5 V-only operation with hardware boot block lockout - eliminating external voltage generation and guaranteeing bootloader integrity without software overhead.
Availability
AT49F040A-70JI-T is available at Aetrix Electronics and suitable for industrial PLCs, embedded bootloaders, automotive diagnostic modules, and medical device configuration storage requiring stable component supply across extended lifecycles.
Supply support for AT49F040A-70JI-T 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 AT49F040A product line was designed for cost-sensitive, 5 V-based embedded systems requiring field-upgradable firmware with hardware-level bootloader protection and EPROM-compatible interface simplicity.
FAQ
What is the maximum operating temperature range for the AT49F040A-70JI-T?
The AT49F040A-70JI-T is rated for industrial operation from −40°C to +85°C. This range is validated per the device's DC and AC specifications in the official Atmel datasheet (3359C–FLASH–3/05), and applies to all functional modes including read, program, and erase. The PLCC package's thermal characteristics support reliable performance under sustained ambient conditions within this envelope. AT49F040A-70JI-T maintains specified tACC ≤ 70 ns and ICC ≤ 20 mA across the full range.
Does the AT49F040A-70JI-T require external high-voltage programming signals?
No, the AT49F040A-70JI-T does not require external high-voltage programming signals. It operates exclusively at 5 V for both read and reprogramming functions. Programming is enabled via six-byte command sequences applied to standard address/data pins using only VCC = 5 V; no VPP or auxiliary voltage rail is needed. Hardware data protection includes VCC sensing that disables programming if supply drops below 3.8 V. AT49F040A-70JI-T achieves full in-system reprogrammability with zero external voltage generation.
How is boot block protection implemented on the AT49F040A-70JI-T?
Boot block protection on the AT49F040A-70JI-T is implemented via a hardware lockout feature activated by a specific six-cycle command sequence (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H). Once enabled, the 16K-byte boot sector (00000H–03FFFH) becomes permanently immune to erase and program commands. Status can be verified by reading I/O0 at address 00002H in software product identification mode. AT49F040A-70JI-T guarantees bootloader integrity without software supervision.
What are the supported package types for the AT49F040A-70JI-T?
The AT49F040A-70JI-T is specifically packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), designated "32J" per Atmel's ordering information. It is not offered in TSOP (32T) or green (JU/TU) variants under this exact suffix. The "J" in -70JI-T denotes PLCC; "I" indicates industrial temperature grade; "T" signifies tape-and-reel packaging. Mechanical dimensions conform to JEDEC MS-016, Variation AE, with 12.45 mm × 14.95 mm footprint and 1.27 mm lead pitch. AT49F040A-70JI-T requires PLCC socket or reflow-compatible land pattern.
Can the AT49F040A-70JI-T be used as a direct replacement for standard EPROMs like the 27C040?
Yes, the AT49F040A-70JI-T is pin- and function-compatible with 27C040 EPROMs in read mode: identical 32-pin PLCC layout, same CE/OE/WE control logic, and matching address/data bus timing (tACC ≤ 70 ns vs. 27C040's 70–120 ns). However, AT49F040A-70JI-T adds in-system reprogrammability without UV erasure - requiring only valid command sequences and 5 V supply. No PCB changes are needed for read-only migration; firmware update capability is enabled via existing control lines. AT49F040A-70JI-T retains EPROM interface familiarity while adding Flash flexibility.
AT49F040A-70JI-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 40µs
- 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-PLCC (13.97x11.43)
AT49F040A-70JI-T FAQ
1.How can I place an order for AT49F040A-70JI-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040A-70JI-T 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 AT49F040A-70JI-T reliable?
The price and inventory of AT49F040A-70JI-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040A-70JI-T is usually 5 days.
3.What payment methods are accepted for AT49F040A-70JI-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040A-70JI-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040A-70JI-T?
AT49F040A-70JI-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040A-70JI-T 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 AT49F040A-70JI-T?
For technical support, including AT49F040A-70JI-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040A-70JI-T requirements.
6.How does Aetrix verify that AT49F040A-70JI-T is sourced from the original manufacturer or authorized distributors?
All AT49F040A-70JI-T 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 AT49F040A-70JI-T meets industry standards.
7.What is the process for return or replacement of AT49F040A-70JI-T?
All AT49F040A-70JI-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040A-70JI-T, 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 AT49F040A-70JI-T part is unused and in its original packaging.
Return procedure for AT49F040A-70JI-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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