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Microchip Technology AT49F040-70PC
- Part No.:
- AT49F040-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F040-70PC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
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Product details
Overview
AT49F040-70PC from Atmel is a 4-megabit (512K × 8) 5V-only parallel Flash memory IC in 32-pin PDIP package, featuring 55 ns read access time, 50 µs byte programming, and 10-second chip erase. It integrates a 16 KB boot block with hardware lockout for secure firmware storage and supports DATA polling and toggle-bit status detection. Used in embedded system boot code storage requiring in-system reprogrammability without high-voltage programming.
For engineers reviewing the AT49F040-70PC datasheet, AT49F040-70PC pinout, AT49F040-70PC application, or AT49F040-70PC equivalent, this page delivers verified technical context, real-world timing behavior, boot-block protection mechanics, voltage-level compatibility, and direct alternative part comparisons grounded in Atmel's official specifications.
Technical Context
The AT49F040-70PC implements a CMOS-based parallel Flash architecture with dual-line control (CE/OE) enabling bus contention avoidance during read cycles. Its internal command register executes 4-bus-cycle programming sequences using address/data latching on WE/CE edges, and supports software-controlled chip erase via six-byte command sequences at fixed addresses (e.g., 5555H/2AAAH).
It features hardware data protection including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses rejected on WE/CE), and logic-level inhibit (OE low, CE high, or WE high blocks writes). Boot block lockout is activated by a specific 6-command sequence and permanently disables erase/program access to addresses 00000H–03FFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), directly maps to 512 KB of byte-addressable storage space |
| Read Access Time | 70 ns max - defines minimum clock-to-data delay in microcontroller or FPGA interface timing budgets |
| Byte Programming Time | 50 µs typical - determines worst-case firmware update latency per byte in field-programmable systems |
| Chip Erase Time | 10 seconds max - sets total downtime required for full memory reset before reprogramming |
| Boot Block Size | 16 KB (00000H–03FFFH) - reserves lowest-address region for immutable bootloader code |
| Supply Voltage | 5 V ±10% - requires stable 4.5–5.5 V rail; no 3.3 V or mixed-voltage support |
| Standby Current | 100 µA (CMOS, commercial temp) - enables ultra-low-power retention in battery-backed systems |
Pinout & Package
AT49F040-70PC uses a 32-lead, 0.600" wide plastic dual inline package (PDIP), pin-compatible with industry-standard 32-pin EPROM sockets and legacy 8-bit microprocessor buses.
| 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 data path; tri-stated when CE or OE high; supports byte-wide reads/writes |
| CE | Chip Enable | Active-low chip select; must be low for any operation; enables internal logic and power domains |
| OE | Output Enable | Active-low output gate; controls data bus drivers only; allows CE-driven standby while preserving outputs |
| WE | Write Enable | Active-low write strobe; latches data on rising edge; initiates program/erase commands when CE low |
| VCC | Power Supply | +5 V supply input; powers core logic, charge pumps, and I/O buffers |
| GND | Ground Reference | Signal and power return; must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for external +12 V or +21 V programming voltages-enables true in-system reprogramming via standard logic rails |
| DATA Polling Status Detection | Allows host processor to poll I/O7 during programming to detect completion without fixed delays or external timers |
| Toggle Bit (I/O6) | Provides asynchronous erase/program completion signal via toggling I/O6; usable with any address and minimal software overhead |
| Hardware Boot Block Lockout | Once enabled, prevents all future erase/write operations to 00000H–03FFFH-ensures bootloader integrity against accidental corruption |
| VCC Sense Protection | Automatically disables programming if VCC drops below ~3.8 V-prevents partial writes during brown-out conditions |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Backup Memory |
|---|---|
Use Scenario: Storing field-upgradable ladder logic and configuration data in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot and application code storage with parallel bus interface to 8051 or Z80-derived microcontrollers. Use Value: 10,000 write cycles and 100 µA standby current enable multi-year deployment without battery backup; 70 ns access meets deterministic scan-time requirements. |
Use Scenario: Serving as secondary BIOS storage in industrial motherboards where primary flash may be inaccessible during recovery. IC Role / Device Role / Timing Role: Standalone 5V-compatible parallel Flash providing read-accessible firmware image independent of main chipset. Use Value: Pinout and command-set compatibility with older 27C040 EPROMs allows drop-in replacement in existing socketed designs without PCB revision. |
| Embedded Network Router Bootloader | Medical Device Diagnostic Code Storage |
Use Scenario: Hosting immutable bootloader code that validates and loads signed application images in network infrastructure equipment. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced write protection on lowest 16 KB region (00000H–03FFFH). Use Value: Boot block lockout prevents malicious or erroneous overwrites of startup routines-critical for FIPS-aligned secure boot chains. |
Use Scenario: Retaining FDA-cleared diagnostic firmware in portable ultrasound or infusion pump devices requiring long-term data integrity. IC Role / Device Role / Timing Role: Radiation-tolerant, nonvolatile storage for safety-critical initialization code accessed at power-on reset. Use Value: 10-second erase and 50 µs/byte programming allow rapid field updates during service windows; 0°C to 70°C rating matches clinical environment specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29F040B-70JC | 4 Mbit (512K × 8), 70 ns access, 5 V only, but uses different command set (AMD-style) and lacks boot block lockout | No hardware-protected boot sector; requires external logic or software to emulate protected region | Select if AMD command compatibility is required and boot security is managed externally |
| SST39VF400A-70-4C-NHE | 4 Mbit (512K × 8), 70 ns access, 3.3 V supply (not 5 V), supports both 3.3 V and 5 V I/O with level-shifting | Requires voltage translation for 5 V bus systems; incompatible with pure 5 V designs without interface redesign | Select only for new 3.3 V designs or when migrating from 5 V to lower-power operation |
Compared with AM29F040B-70JC and SST39VF400A-70-4C-NHE, the AT49F040-70PC uniquely delivers native 5 V operation with integrated boot block lockout-eliminating external protection circuitry and ensuring deterministic security for legacy 5 V embedded platforms.
Availability
AT49F040-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS backup, embedded router bootloaders, and medical device diagnostic code storage requiring stable component supply across extended product lifecycles.
Supply support for AT49F040-70PC 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 industrial, automotive, and consumer applications.
The AT49F040-70PC belongs to Atmel's early-generation parallel Flash memory product line, designed specifically for 5 V embedded systems needing in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT49F040-70PC?
The AT49F040-70PC is rated for commercial temperature operation from 0°C to +70°C. Its ordering code suffix "C" confirms this range-distinct from industrial-grade variants (e.g., AT49F040-70PI) rated for –40°C to +85°C. The 70 ns access time and all DC/AC specifications are guaranteed within this 0°C–70°C window.
Does the AT49F040-70PC support 3.3 V operation?
No, the AT49F040-70PC is a 5-volt-only device. Its absolute maximum VCC is +6.25 V, and functional operation is specified only at 5 V ±10% (4.5 V to 5.5 V). It does not support 3.3 V supply or mixed-voltage I/O interfaces-using it with 3.3 V controllers requires level-shifting circuitry.
How is the boot block lockout feature enabled on the AT49F040-70PC?
The boot block lockout on AT49F040-70PC is enabled via a precise six-command software sequence: load AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H-with a 1-second pause before the final command. Once executed, the lockout is permanent and irreversible.
Can the AT49F040-70PC be used as a direct replacement for a 27C040 EPROM?
The AT49F040-70PC shares the same 32-pin PDIP package, pinout, and read-mode timing as the 27C040 EPROM, enabling socket-level replacement in many systems. However, it requires active WE control and command-based programming-unlike EPROM UV-erasure-so write functionality needs updated firmware or hardware support.
What status detection methods does the AT49F040-70PC provide during programming?
The AT49F040-70PC provides two hardware-supported status detection methods: DATA polling (I/O7 complements written data until programming completes) and Toggle Bit (I/O6 toggles during active programming/erase and stops when complete). Both operate without external clocks and can be polled asynchronously by the host controller.
AT49F040-70PC 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F040-70PC FAQ
1.How can I place an order for AT49F040-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-70PC 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 AT49F040-70PC reliable?
The price and inventory of AT49F040-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-70PC is usually 5 days.
3.What payment methods are accepted for AT49F040-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-70PC?
AT49F040-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-70PC 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 AT49F040-70PC?
For technical support, including AT49F040-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-70PC requirements.
6.How does Aetrix verify that AT49F040-70PC is sourced from the original manufacturer or authorized distributors?
All AT49F040-70PC 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 AT49F040-70PC meets industry standards.
7.What is the process for return or replacement of AT49F040-70PC?
All AT49F040-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-70PC, 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 AT49F040-70PC part is unused and in its original packaging.
Return procedure for AT49F040-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040-70PC Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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