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Microchip Technology AT49F040A-70JI
- Part No.:
- AT49F040A-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040A-70JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,056
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Product details
Overview
AT49F040A-70JI from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 70 ns read access time, 20 µs/byte programming, 6-second sector erase, 10,000 write cycles, and features hardware data protection with boot block lockout for secure firmware storage.
For engineers reviewing the AT49F040A-70JI datasheet, AT49F040A-70JI pinout, AT49F040A-70JI application, or AT49F040A-70JI equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), PLCC-32 package compatibility, 5V-only operation without high-voltage programming, sector-based erase architecture, and DATA polling/toggle bit for program/erase cycle detection.
Technical Context
The AT49F040A-70JI implements a command-controlled Flash architecture with dedicated boot block (16 KB), two parameter blocks (8 KB each), and eight main memory blocks (one 32 KB + seven 64 KB). Erase and program operations are initiated via six-cycle software command sequences using standard microprocessor timing on CE/WE/OE control lines.
It supports EPROM-like read interface with CE/OE/WE dual-line bus contention control, internal program timers eliminating external clocks, and hardware safeguards including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and write inhibit logic (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full firmware images for 8-bit microcontrollers with space for configuration data. |
| Read Access Time | 70 ns - enables direct execution from Flash (XIP) in systems with ≤14 MHz bus timing. |
| Byte Programming Time | 20 µs typical - allows rapid field updates of small data segments without system interruption. |
| Sector Erase Time | 6 seconds max - balances speed and reliability for parameter or application code updates. |
| Endurance | 10,000 program/erase cycles - suitable for infrequently updated boot code and moderately revised configuration tables. |
| Operating Voltage | 5.0 V ±10% - eliminates need for charge pumps or external voltage translators in legacy 5V designs. |
| Temperature Range | −40°C to +85°C - qualified for industrial control, automotive body electronics, and networking equipment. |
| Standby Current | 70 µA CMOS - reduces power in sleep modes for battery-backed or energy-sensitive applications. |
Pinout & Package
AT49F040A-70JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch and 12.45 mm × 12.45 mm body size. Pin 1 identifier is a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A18 don't care during command entry. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K families; supports DATA polling on I/O7 and toggle bit on I/O6. |
| CE | Chip Enable | Active-low chip select; latches addresses and commands when combined with WE/OE per timing waveforms. |
| OE | Output Enable | Active-low output control; enables high-impedance state when high to prevent bus contention during reads. |
| WE | Write Enable | Active-low write strobe; initiates command loading, byte programming, and sector erase when CE is low and OE is high. |
| VCC | Power Supply | +5.0 V supply; internal VCC sense disables programming if voltage drops below 3.8 V. |
| GND | Ground | Reference for all inputs/outputs; decoupling required within 10 mm of VCC pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage, simplifying power design and enabling in-circuit reprogramming via standard logic-level signals. |
| Boot Block Lockout | 16 KB (00000H–03FFFH) can be permanently write-protected via command sequence to safeguard bootloader integrity across firmware updates. |
| DATA Polling & Toggle Bit | I/O7 complement indicates active programming; I/O6 toggling confirms erase/program progress - both enable real-time status monitoring without polling overhead. |
| Sector Architecture | Independent erasure of boot block, two 8 KB parameter blocks, and eight main memory blocks minimizes update time and preserves valid data during partial rewrites. |
| Hardware Data Protection | VCC sense, noise filtering, and multi-signal write inhibit prevent accidental writes during power transients or EMI events in harsh industrial environments. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers requiring field-upgradable code without hardware reset. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable 70 ns read timing and sector-erase granularity to update only modified function blocks. Use Value: Enables remote firmware patches via RS-485 without full device reflash, reducing downtime and supporting version rollback via parameter block backups. | Use Scenario: Holding calibration data, seat/mirror position profiles, and lighting control algorithms in vehicle body domain controllers. IC Role / Device Role / Timing Role: Parameter storage with boot block lockout ensuring bootloader remains intact during over-the-air (OTA) updates of application code. Use Value: Prevents bricking during interrupted OTA sessions by isolating critical startup code from user-modifiable data regions. |
| Legacy 8-bit Microcontroller Systems | Network Equipment Bootloader |
Use Scenario: Replacing EPROMs in aging industrial instrumentation using 8051 or Z80-based designs where board space and voltage compatibility constrain upgrade options. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical CE/OE/WE interface and 5V-only operation, supporting same PCB footprint as 27C040. Use Value: Extends product lifecycle without redesign; retains existing address decoding while adding in-system reprogrammability and 10× endurance. | Use Scenario: Storing primary bootloader and fail-safe recovery image in Ethernet switches and routers requiring dual-image redundancy. IC Role / Device Role / Timing Role: Dual-sector protected storage: boot block holds immutable first-stage loader; adjacent parameter block stores checksum-verified secondary image metadata. Use Value: Guarantees boot continuity after power loss during firmware update by validating image integrity before execution. |
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, 3.0 V core with 5 V I/O; requires 12 V for reset; different command set and sector map. | Not pin-compatible; requires level-shifting and modified firmware for command sequences. | Select only if migrating to lower-voltage core with mixed-voltage I/O support and existing AM29LV design infrastructure. |
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns, 3.3 V supply; no 5 V tolerance; uses different unlock bypass and sector protection model. | Requires PCB redesign for 3.3 V supply and level translation; incompatible boot block lockout mechanism. | Choose for new 3.3 V designs prioritizing lower active current (15 mA vs. 20 mA) and extended temperature range (−40°C to +125°C). |
Compared with AM29LV040B-70JCI and SST39VF400A-70-4C-NHE, the AT49F040A-70JI uniquely supports true 5V-only operation with no high-voltage pins, identical EPROM-style timing, and a dedicated 16 KB boot block with irreversible lockout-making it optimal for legacy 5V systems needing secure, field-upgradable firmware without hardware changes.
Availability
AT49F040A-70JI is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, legacy microcontroller upgrades, and network equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for AT49F040A-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
Microchip Technology acquired Atmel in 2016 and maintains its Flash memory portfolio for industrial and automotive applications with focus on reliability and long-term support.
The AT49F040A-70JI belongs to Atmel's legacy parallel-interface Flash family designed for drop-in EPROM replacement in 5V embedded systems requiring in-system reprogrammability and robust data retention.
FAQ
What is the operating temperature range for the AT49F040A-70JI?
The AT49F040A-70JI is rated for industrial temperature operation from −40°C to +85°C. This range is validated per the device's DC and AC specifications in the official datasheet (3359C–FLASH–3/05), and applies to all guaranteed timing parameters including 70 ns read access and 20 µs byte programming. The PLCC-32 package construction supports thermal cycling reliability across this span.
Does the AT49F040A-70JI require high-voltage programming signals?
No, the AT49F040A-70JI operates exclusively at 5.0 V for both read and reprogramming functions. It does not require 12 V or other elevated voltages. Programming is enabled through standardized 5V-only command sequences applied to CE, WE, and OE pins, with internal circuitry generating necessary high-voltage pulses. This eliminates external voltage translators and simplifies system design.
How is boot block protection implemented on the AT49F040A-70JI?
The AT49F040A-70JI implements boot block protection via a six-cycle command sequence that permanently disables programming and erasure of the 16 KB boot sector (addresses 00000H–03FFFH). Once activated, the lockout cannot be reversed. Status is verified by reading I/O0 at address 00002H in software product identification mode: high = locked, low = unlocked. This ensures bootloader integrity during field updates.
What methods does the AT49F040A-70JI provide to detect completion of programming or erase cycles?
The AT49F040A-70JI provides two hardware-supported detection methods: DATA polling (I/O7 returns complement of written data until completion, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during operation, then stabilizes). Both methods allow real-time monitoring without fixed delay loops and are usable at any point during the cycle, enabling efficient CPU utilization during Flash operations.
Is the AT49F040A-70JI pin-compatible with standard EPROMs like the 27C040?
Yes, the AT49F040A-70JI uses the same 32-pin PLCC footprint and identical CE/OE/WE control interface as the 27C040 EPROM, supporting direct socket replacement in existing designs. Address and data pinouts match exactly, and read timing (70 ns) meets or exceeds EPROM performance. No PCB modification is needed-only firmware adaptation for command-based erase/program sequences instead of UV erasure.
AT49F040A-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:
- 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 FAQ
1.How can I place an order for AT49F040A-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040A-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 AT49F040A-70JI reliable?
The price and inventory of AT49F040A-70JI 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 is usually 5 days.
3.What payment methods are accepted for AT49F040A-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040A-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040A-70JI?
AT49F040A-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040A-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 AT49F040A-70JI?
For technical support, including AT49F040A-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040A-70JI requirements.
6.How does Aetrix verify that AT49F040A-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F040A-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 AT49F040A-70JI meets industry standards.
7.What is the process for return or replacement of AT49F040A-70JI?
All AT49F040A-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040A-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 AT49F040A-70JI part is unused and in its original packaging.
Return procedure for AT49F040A-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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