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Microchip Technology AT49F040-70JI
- Part No.:
- AT49F040-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040-70JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,820
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Product details
Overview
AT49F040-70JI from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC in a 32-lead PLCC package, featuring 55 ns read access time, 10-second chip erase, and byte-programmable architecture with hardware data protection. It integrates a 16-Kbyte boot block with optional lockout for secure firmware storage and supports in-system reprogramming without high-voltage inputs.
For engineers reviewing the AT49F040-70JI datasheet, AT49F040-70JI pinout, AT49F040-70JI application, or AT49F040-70JI equivalent, this device serves as a drop-in replacement for EPROM-based boot code storage in industrial controllers, embedded BIOS modules, and legacy system firmware where 5V-only operation, deterministic erase timing, and boot-sector write protection are required.
Technical Context
The AT49F040-70JI implements a single-voltage 5V-only command-set architecture using six-byte software sequences for chip erase, byte programming, and boot block lockout activation. Its internal logic decodes address latches on the falling edge of CE or WE (whichever occurs last) and data latches on the rising edge of CE or WE (whichever occurs first).
It features dual end-of-operation detection: DATA polling (I/O7 complement during programming) and TOGGLE BIT (I/O6 toggling during program/erase cycles), both usable at any time during the cycle. Hardware protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and signal-level inhibit (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits |
| Read Access Time | 70 ns max - guarantees deterministic timing for 14.3 MHz bus interface |
| Chip Erase Time | 10 seconds typical - enables predictable firmware update windows |
| Byte Programming Time | 50 µs typical - supports fine-grained field updates without full-image reload |
| Boot Block Size | 16 Kbytes (00000H–03FFFH) - fixed bottom-boot sector for secure bootloader storage |
| Endurance | 10,000 program/erase cycles - validated lifetime for infrequent firmware revisions |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic systems without level translation |
| Temperature Range | −40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
AT49F040-70JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE, with lead pitch 1.27 mm and body size 18.5 × 18.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing (A0 LSB, A18 MSB) |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path; outputs float when CE or OE high |
| CE | Chip Enable | Active-low global enable; must be low for read/write; inhibits programming if high |
| OE | Output Enable | Active-low output control; used with CE for bus contention avoidance |
| WE | Write Enable | Active-low write strobe; latches address/data edges for command sequencing |
| VCC | Power Supply | +5V supply; internal VCC sense disables programming below 3.8V |
| GND | Ground Reference | Signal and power return; referenced for all input thresholds and output levels |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage, simplifying power design and enabling direct replacement of EPROMs |
| Hardware Boot Block Lockout | Irreversible 16-Kbyte write protection after activation, ensuring bootloader integrity across field updates |
| DATA Polling & TOGGLE BIT | Dual asynchronous status reporting methods allow host CPU to poll I/O7 or I/O6 without timer dependencies |
| Internal Program Timer | Self-timed erase and programming eliminate external timing circuitry or software delays |
| CMOS Standby Current | 100 µA max at 0°C–70°C - reduces system power in sleep modes without sacrificing retention |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded BIOS Modules |
|---|---|
Use Scenario: Storing configuration firmware and real-time control logic in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding startup code and runtime parameter tables; accessed via 8-bit parallel bus at ≤14.3 MHz. Use Value: 10,000-cycle endurance and −40°C to +85°C qualification ensure reliable operation over 10+ years in uncontrolled cabinet environments. | Use Scenario: Replacing UV-erasable EPROMs in aging PC-compatible motherboard BIOS chips requiring field-upgradable firmware. IC Role / Device Role / Timing Role: Primary boot ROM executing Power-On Self-Test (POST) and initializing chipset peripherals before handing control to OS loader. Use Value: Bottom-boot architecture and hardware lockout prevent accidental corruption of critical initialization routines during BIOS updates. |
| Telecom Line Card Boot Code | Medical Device Configuration Memory |
Use Scenario: Holding boot firmware and calibration data on carrier-grade line cards used in DSLAM and optical transport equipment. IC Role / Device Role / Timing Role: Parallel Flash memory mapped into processor address space; read during cold start and updated during maintenance windows. Use Value: 70 ns access time meets tight timing budgets for ARM7/SH-3 based control processors; 5V-only interface avoids mixed-voltage board design. | Use Scenario: Storing FDA-cleared device configuration profiles, sensor calibration constants, and safety-critical boot parameters in diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Secure nonvolatile storage for immutable boot code and user-modifiable operational parameters, isolated via boot block lockout. Use Value: Irreversible boot sector protection satisfies IEC 62304 software lifecycle requirements for Class C medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-70JC | 4 Mbit, 5V, 70 ns, 32-pin PDIP/PLCC; requires 12V for reset but supports sector erase | Supports 64-Kbyte sector erase vs. AT49F040-70JI's full-chip erase only | Select for designs needing partial updates without full-image reload |
| SST39VF040-70-4C-NHE | 4 Mbit, 3.3V/5V tolerant, 70 ns, 32-pin TSOP/PLCC; no boot block lockout feature | Lacks hardware-protected boot sector; relies on software write-protection schemes | Select for 3.3V systems or where boot block security is managed externally |
Compared with AM29LV040B-70JC and SST39VF040-70-4C-NHE, the AT49F040-70JI uniquely provides factory-verified 16-Kbyte bottom-boot lockout with irreversible hardware enforcement, making it optimal for safety-critical boot code where firmware integrity must survive power loss or software faults.
Availability
AT49F040-70JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded BIOS modules, and telecom line card boot code requiring stable component supply across extended product lifecycles.
Supply support for AT49F040-70JI 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 for industrial and embedded markets.
The AT49F040-70JI belongs to Atmel's 5V-only parallel Flash memory product line, designed specifically for seamless EPROM replacement in legacy 5V systems requiring in-system reprogrammability and hardware-enforced boot code protection.
FAQ
What is the operating temperature range for the AT49F040-70JI?
The AT49F040-70JI is rated for industrial operation from −40°C to +85°C, as confirmed by Atmel's ordering information table and DC/AC specifications. This range ensures reliable performance in factory-floor controllers, telecom infrastructure, and medical equipment without thermal derating. The "I" suffix in AT49F040-70JI explicitly denotes industrial temperature qualification, distinct from commercial-grade "C" variants.
Does the AT49F040-70JI support sector erase or only full-chip erase?
The AT49F040-70JI supports only full-chip erase - not sector or block erase - as specified in its Device Operation section and Command Definitions table. The chip erase command is a six-byte sequence initiating a complete 4-Mbit array erasure in ≤10 seconds. While it includes a 16-Kbyte boot block, that region is protected from erasure only when lockout is enabled; otherwise, it erases with the main array.
How is boot block lockout activated on the AT49F040-70JI?
Boot block lockout on the AT49F040-70JI is activated via a six-byte software command sequence: load AAh to address 5555h, 55h to 2AAAh, 80h to 5555h, then AAh to 5555h, 55h to 2AAAh, and 40h to 5555h - followed by a 1-second pause. Once executed, the lockout is irreversible, and reads from address 00002h will return high on I/O0 to confirm activation.
What package type does the AT49F040-70JI use?
The AT49F040-70JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated "32J" in Atmel's Ordering Information table. Its mechanical dimensions conform to JEDEC standard MS-016 AE, with 1.27 mm lead pitch and 18.5 mm × 18.5 mm body size - distinct from the PDIP ("32P6") and TSOP ("32T") variants in the same family.
Can the AT49F040-70JI be used as a direct replacement for EPROMs like the 27C040?
Yes, the AT49F040-70JI is designed as a functional and pin-compatible replacement for 5V EPROMs such as the 27C040, sharing identical 32-pin PLCC pinout, 5V-only operation, and EPROM-like read behavior. However, unlike EPROMs, it requires specific software commands for programming and erase - no UV erasure or 12V programming voltage is needed, simplifying system-level reprogramming.
AT49F040-70JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 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)
AT49F040-70JI FAQ
1.How can I place an order for AT49F040-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-70JI 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 AT49F040-70JI reliable?
The price and inventory of AT49F040-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-70JI is usually 5 days.
3.What payment methods are accepted for AT49F040-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-70JI?
AT49F040-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-70JI 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 AT49F040-70JI?
For technical support, including AT49F040-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-70JI requirements.
6.How does Aetrix verify that AT49F040-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F040-70JI 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 AT49F040-70JI meets industry standards.
7.What is the process for return or replacement of AT49F040-70JI?
All AT49F040-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-70JI, 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 AT49F040-70JI part is unused and in its original packaging.
Return procedure for AT49F040-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040-70JI Tags
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