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Microchip Technology AT49F040A-70PI
- Part No.:
- AT49F040A-70PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F040A-70PI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F040A-70PI from Atmel is a 5V-only, 4-megabit (512K × 8) parallel-interface Flash memory IC designed for embedded firmware storage and boot code retention. It delivers 70 ns read access time, supports byte-by-byte programming (20 µs/byte), features hardware data protection, and includes a dedicated 16KB boot block with programmable lockout-used in industrial control systems requiring secure, field-upgradable firmware.
For engineers reviewing the AT49F040A-70PI datasheet, AT49F040A-70PI pinout, AT49F040A-70PI application, or AT49F040A-70PI equivalent, this page provides verified technical context, sector-erase timing, boot-block lockout detection logic, DATA polling and toggle-bit status monitoring, and real-world design implications of its 10,000-cycle endurance and 70 µA CMOS standby current.
Technical Context
The AT49F040A-70PI implements a sector-architected Flash array with one 16KB boot block, two 8KB parameter blocks, and eight main memory blocks (one 32KB + seven 64KB). Its command interface uses standard CE/OE/WE controls with six-cycle software command sequences for chip/sector erase and boot-lock enable.
It operates exclusively at 5V ±10% across –40°C to +85°C, requires no high-voltage programming inputs, and integrates internal program timers and VCC sense circuitry (<3.8V inhibition). Data integrity is enforced via hardware write inhibit, noise filtering on WE/CE, and dual status verification methods: DATA polling (I/O7 complement) and toggle-bit monitoring (I/O6).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - directly replaces EPROMs in legacy 8-bit bus systems without address decoding changes. |
| Read Access Time | 70 ns max - ensures compatibility with 14 MHz Z80, 8051, and 68K-based controllers using standard wait-state logic. |
| Byte Programming Time | 20 µs typical - enables fast field updates of configuration parameters or calibration data without system downtime. |
| Erase Cycle Time | 6 seconds max for full chip - allows predictable firmware update windows in automated test and manufacturing environments. |
| Endurance | 10,000 program/erase cycles - supports multi-year field reprogramming in industrial HMI and PLC firmware storage. |
| Standby Current | 70 µA CMOS - reduces power budget impact in always-on embedded systems with battery-backed operation. |
| Operating Voltage | 5V ±10% - eliminates need for auxiliary voltage rails; compatible with legacy 5V logic families and microcontroller I/O. |
Pinout & Package
AT49F040A-70PI is supplied in a 32-pin plastic DIP (PDIP) package, 0.600" wide (32P6), with through-hole mounting and industry-standard pin spacing (2.54 mm pitch). Pin 1 is marked by a notch or beveled corner on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A18 are don't-care during product ID mode. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; I/O7 used for DATA polling status, I/O6 for toggle-bit monitoring during program/erase. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; latches address/data during command sequences. |
| OE | Output Enable | Active-low output control; high during programming/erasing to prevent bus contention; required high for command entry. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data in command and programming cycles. |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if voltage drops below ~3.8V. |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor (0.1 µF) required within 1 cm of VCC/GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16KB (00000H–03FFFH) permanently protected after 6-command sequence - secures bootloader code against accidental overwrite in field-deployed devices. |
| Sector Erase Flexibility | Independent erase of two 8KB parameter blocks and eight main memory blocks - enables selective firmware patching without full reflash. |
| Status Monitoring | Dual real-time feedback: DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Hardware Write Protection | VCC sense, noise filtering (<15 ns pulses rejected), and control-line inhibit (OE high/CE high/WE high) - prevents spurious writes during power transients or EMI events. |
| Software Product Identification | Manufacturer code 1FH / device code 13H readable via 3-cycle software entry - enables automatic algorithm selection in universal programmers. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory-floor environments with temperature cycling and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with 70 ns read access enabling deterministic scan-cycle execution; boot block lockout preserves safe startup code. Use Value: Eliminates need for external EEPROM + ROM combination; 10,000-cycle endurance supports >5 years of scheduled firmware patches without hardware replacement. |
Use Scenario: Holding certified bootloader and diagnostic routines in Class II medical instruments requiring FDA-compliant firmware integrity and traceability. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced write protection; DATA polling ensures verified write completion before safety-critical initialization proceeds. Use Value: Meets IEC 62304 software lifecycle requirements by preventing unauthorized modification of boot code while allowing validated application updates. |
| Automotive Body Control Module (BCM) | Legacy Industrial HMI Configuration Storage |
Use Scenario: Storing vehicle-specific calibration tables and CAN message routing logic in under-hood BCMs exposed to –40°C to +85°C thermal stress. IC Role / Device Role / Timing Role: Temperature-rated Flash memory with 70 µA standby current minimizing parasitic drain on 12V battery during sleep mode. Use Value: Replaces costlier automotive-grade serial Flash; sector erase allows updating only affected calibration sectors without disrupting operational firmware. |
Use Scenario: Retaining operator-configurable display language, alarm thresholds, and I/O mapping in panel-mounted HMIs built on aging 8051 or Z80 platforms. IC Role / Device Role / Timing Role: Direct EPROM drop-in replacement with identical 32-pin PDIP footprint and parallel bus timing - zero PCB redesign required. Use Value: Enables migration from obsolete UV-erasable EPROMs to electrically reprogrammable Flash while preserving legacy toolchains and socket layouts. |
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, 70 ns, 3.0–3.6V core + 5V I/O; requires VPP = 12V for programming | Not 5V-only; incompatible with pure 5V systems lacking VPP generation | Select only if existing design already supplies 12V VPP and requires lower active current (9 mA vs. 20 mA). |
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns, 3.3V-only operation; no 5V support; different command set and sector map | Requires level-shifting for 5V microcontrollers; boot block size and lockout behavior differ | Choose only for new 3.3V designs where lower power (30 µA standby) outweighs compatibility risk. |
Compared with AM29LV040B-70JC and SST39VF400A-70-4C-NHE, the AT49F040A-70PI uniquely supports true single-supply 5V operation with no VPP, retains EPROM-compatible pinout and timing, and offers verified boot-block lockout - making it the only drop-in solution for legacy 5V industrial and automotive systems requiring field firmware updates.
Availability
AT49F040A-70PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader retention, and automotive body control module calibration storage requiring stable component supply across extended product lifecycles.
Supply support for AT49F040A-70PI 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, nonvolatile memory, and security ICs for industrial, automotive, and consumer applications.
The AT49F040A-70PI belongs to Atmel's parallel Flash memory product line, engineered for seamless EPROM replacement in legacy 8-bit and 16-bit embedded systems requiring reliable, in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT49F040A-70PI?
The AT49F040A-70PI is rated for industrial operation from –40°C to +85°C. This range is confirmed in the "DC and AC Operating Range" table of the official datasheet (3359A–FLASH–6/03), where the "-70" speed grade explicitly specifies the –40°C to +85°C case temperature limit. The device maintains full 70 ns read access and 20 µs byte programming performance across this entire range.
Does the AT49F040A-70PI require a high-voltage programming supply?
No, the AT49F040A-70PI does not require any high-voltage programming supply. As stated in the "Features" section and "Description", it is a "5-volt only" device: both read and reprogramming operations use only the standard 5V VCC supply. Internal circuitry generates all necessary programming voltages, eliminating the need for external VPP generators or complex power sequencing.
How is boot block protection enabled on the AT49F040A-70PI?
Boot block protection on the AT49F040A-70PI is enabled via a precise six-command software sequence: load AAh to address 555H, 55h to AAAH, 80h to 555H, AAh to 555H, 55h to AAAH, then 40h to 555H - followed by a mandatory 1-second pause. Once executed, the 16KB boot block (00000H–03FFFH) becomes permanently write-protected, and no further erasure or programming is possible.
Can the AT49F040A-70PI be used as a direct replacement for standard EPROMs like the 27C040?
Yes, the AT49F040A-70PI is designed as a functional and pin-compatible replacement for the 27C040 EPROM. It shares the same 32-pin PDIP package, identical address/data bus layout (A0–A18, I/O0–I/O7), and compatible CE/OE/WE control signals. Unlike EPROMs, it requires no UV erasure and supports in-system reprogramming - but behaves identically during read cycles.
What methods does the AT49F040A-70PI provide to detect the end of a programming cycle?
The AT49F040A-70PI provides two independent, hardware-verified methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and toggle-bit detection (I/O6 toggles between 0 and 1 during programming and stops when complete). Both methods allow host firmware to avoid fixed delays and respond dynamically to actual device state.
AT49F040A-70PI 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:
- 40µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F040A-70PI FAQ
1.How can I place an order for AT49F040A-70PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040A-70PI 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-70PI reliable?
The price and inventory of AT49F040A-70PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040A-70PI is usually 5 days.
3.What payment methods are accepted for AT49F040A-70PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040A-70PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040A-70PI?
AT49F040A-70PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040A-70PI 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-70PI?
For technical support, including AT49F040A-70PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040A-70PI requirements.
6.How does Aetrix verify that AT49F040A-70PI is sourced from the original manufacturer or authorized distributors?
All AT49F040A-70PI 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-70PI meets industry standards.
7.What is the process for return or replacement of AT49F040A-70PI?
All AT49F040A-70PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040A-70PI, 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-70PI part is unused and in its original packaging.
Return procedure for AT49F040A-70PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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