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Microchip Technology AT49F040-12TC
- Part No.:
- AT49F040-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F040-12TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F040-12TC from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC used for nonvolatile program/data storage in embedded boot code and firmware applications. It features 55 ns read access time, 10-second chip erase, 50 µs/byte programming, 16 KB boot block with hardware lockout, and operates across industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT49F040-12TC datasheet, AT49F040-12TC pinout, AT49F040-12TC application, or AT49F040-12TC equivalent, key selection considerations include 32-pin TSOP package compatibility, 5V-only operation without high-voltage programming, DATA polling and toggle-bit status detection, boot-sector write protection, and industrial-grade reliability for firmware storage in legacy microcontroller systems.
Technical Context
The AT49F040-12TC implements a parallel-addressable Flash architecture with A0–A18 address inputs, I/O0–I/O7 bidirectional data bus, and standard control signals CE/OE/WE. Its internal command register enables software-controlled operations including chip erase, byte programming, and boot block lockout via six-cycle command sequences at fixed address locations (e.g., 5555H/2AAAH).
It supports EPROM-like read mode (CE+OE low, WE high), hardware data protection via VCC sense (<3.8 V inhibits programming), noise filtering on WE/CE (<15 ns pulses ignored), and dual status detection-DATA polling (I/O7 complement during programming) and toggle-bit monitoring (I/O6 toggling during erase/program cycles).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits), organized as 512K words × 8 bits |
| Read Access Time | 120 ns maximum - defines minimum bus cycle timing for reliable CPU interface |
| Byte Programming Time | 50 µs typical - determines firmware update latency per byte in field reprogramming |
| Chip Erase Time | 10 seconds maximum - sets worst-case downtime during full memory reinitialization |
| Boot Block Size | 16 KB (00000H–03FFFH) - reserves lowest-address region for protected bootloader code |
| Operating Voltage | 5.0 V ±10% - eliminates need for external voltage translators in 5V logic systems |
| Temperature Range | –40°C to +85°C - qualifies for industrial control, networking, and automotive under-hood ancillary modules |
| Endurance | 10,000 program/erase cycles - supports long-term field firmware updates without premature wear-out |
Pinout & Package
AT49F040-12TC uses a 32-lead Thin Small Outline Package (TSOP, Type 1), 10.16 mm × 20.07 mm body, 0.5 mm lead pitch, gull-wing leads, RoHS-compliant plastic encapsulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus selecting one of 524,288 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read data output and program data input |
| CE | Chip Enable | Active-low global select; disables outputs and reduces current to 300 µA standby when high |
| OE | Output Enable | Active-low read control; places I/O pins in high-impedance state when deasserted |
| WE | Write Enable | Active-low signal initiating byte programming or command latching; must meet 90 ns pulse width |
| VCC | Power Supply | +5 V supply; powers core logic and I/O buffers; includes VCC sense circuitry for programming safety |
| GND | Ground Reference | Signal and power return path; decoupling required within 10 mm of VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for dedicated 12V programming voltage, simplifying system power design and enabling in-system reprogramming |
| Hardware Boot Block Lockout | Permanently protects 16 KB (00000H–03FFFH) from accidental erasure or overwrite after activation, ensuring bootloader integrity |
| DATA Polling & Toggle-Bit Status | Enables real-time, bus-compatible end-of-program detection without requiring external timers or interrupt lines |
| Internal Program Timer & Control Logic | Automates byte programming pulses and erase timing, removing external timing circuitry and reducing host MCU overhead |
| CMOS Standby Current | 300 µA maximum at industrial temperature ensures low-power retention in always-on embedded systems |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Backup |
|---|---|
Use Scenario: Storing configuration firmware and motion-control algorithms in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing boot code and runtime parameter storage with direct MPU bus interface. Use Value: 16 KB boot block lockout prevents corruption of critical startup routines during field firmware upgrades, while 10,000-cycle endurance supports multi-year maintenance cycles. | Use Scenario: Acting as secondary BIOS storage in industrial motherboards where primary flash may be inaccessible during recovery. IC Role / Device Role / Timing Role: Standalone 5V Flash memory mapped into x86 memory space for fail-safe BIOS restoration. Use Value: 120 ns read access meets ISA bus timing requirements; TSOP package allows compact PCB layout in constrained socketed BIOS module footprints. |
| Telecom Line Card Bootloader | Medical Device Configuration Memory |
Use Scenario: Hosting secure bootloader code on carrier-grade line cards requiring hot-swap firmware updates without service interruption. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory interfaced to ARM7 or MIPS-based management processors. Use Value: Hardware data protection (VCC sense, noise filtering) prevents spurious writes during power transients common in telecom power systems. | Use Scenario: Retaining calibrated sensor offsets and regulatory-compliant device settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization sequence of microcontroller subsystems. Use Value: Industrial temperature rating (–40°C to +85°C) ensures reliable operation across clinical and transport environments; boot block lockout safeguards FDA-mandated calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-120EC | 4 Mbit (512K × 8), 3.0–3.6 V operation, 120 ns access, 12 V programming not required | Requires 3.3 V system; lacks dedicated boot block lockout; uses different command set | Select only if migrating to 3.3 V platform and redesigning power delivery and command firmware |
| SST39VF400A-120-4C-NHE | 4 Mbit (512K × 8), 3.0–3.6 V, 120 ns access, 16 KB boot sector with software lock | 3.3 V only; no 5 V compatibility; different pinout (32-pin TSOP but address/data mapping differs) | Use only when replacing in 3.3 V designs with verified SST command compatibility and layout revision |
Compared with AM29LV040B-120EC and SST39VF400A-120-4C-NHE, the AT49F040-12TC uniquely supports 5 V-only operation with hardware-enforced boot block lockout and identical TSOP pinout to legacy 27C040 EPROMs-enabling drop-in replacement in existing 5 V embedded systems without voltage translation or firmware rewrite.
Availability
AT49F040-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS backup, and telecom line card bootloader applications requiring stable component supply, long-lifecycle support, and industrial temperature qualification.
Supply support for AT49F040-12TC 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.
The AT49F040-12TC belongs to Atmel's parallel Flash memory product line, designed specifically for 5 V embedded systems requiring in-system reprogrammability, robust boot code protection, and industrial-grade reliability without high-voltage programming circuitry.
FAQ
What is the operating voltage range for the AT49F040-12TC?
The AT49F040-12TC operates exclusively at 5.0 V ±10% (4.5 V to 5.5 V). It does not support 3.3 V or mixed-voltage operation. This single-supply requirement eliminates level-shifting components in legacy 5 V designs and enables direct replacement of EPROMs like the 27C040. The device incorporates VCC sense circuitry that inhibits programming if supply drops below ~3.8 V, preventing data corruption during brownout conditions. AT49F040-12TC's 5 V-only architecture is fundamental to its compatibility with older microcontroller buses and simplified power architecture.
Does the AT49F040-12TC support true in-system programming without removing the chip from the board?
Yes, the AT49F040-12TC supports full in-system programming (ISP) while soldered onto the target PCB. It requires only standard 5 V logic levels on CE, OE, WE, address, and data lines-no external high-voltage generator or special programming adapter. Commands such as chip erase, byte programming, and boot block lockout are executed via six-byte software sequences written to specific addresses (e.g., 5555H/2AAAH). The AT49F040-12TC's internal timer and pulse generation eliminate external timing components, making it suitable for field firmware updates using the host processor's native bus interface.
How is boot block protection implemented in the AT49F040-12TC?
The AT49F040-12TC implements hardware-enforced boot block protection for the lowest 16 KB (addresses 00000H–03FFFH). Once activated via a six-cycle command sequence (5555H/AA → 2AAAH/55 → 5555H/40), the lockout becomes permanent: no subsequent erase or program commands affect this region. Protection status is verifiable by reading I/O0 during software product identification mode. Unlike software-only schemes, this hardware lock cannot be overridden by command errors or firmware bugs, ensuring bootloader integrity in safety-critical applications. AT49F040-12TC's boot block is "bottom-boot" configured and optional-users may leave it unprotected if not needed.
What methods does the AT49F040-12TC provide to detect completion of programming or erase operations?
The AT49F040-12TC provides two independent, bus-compatible status detection methods: DATA polling and toggle-bit monitoring. During byte programming, reading the programmed location returns the complement of the loaded data on I/O7 until completion; afterward, true data appears. During erase or program cycles, I/O6 toggles between 0 and 1 on successive reads and stops toggling once complete. Both methods require no external clocks or interrupts and work with any host processor that can perform consecutive memory reads. These features are integral to AT49F040-12TC's autonomous operation and eliminate need for fixed delay loops in host firmware.
Is the AT49F040-12TC pin-compatible with standard EPROMs like the 27C040?
Yes, the AT49F040-12TC in TSOP (32T) package is pin-for-pin compatible with the 27C040 EPROM, sharing identical pin functions (A0–A18, I/O0–I/O7, CE, OE, WE, VCC, GND) and electrical timing envelopes for read operations. This allows direct replacement in existing 5 V systems without PCB redesign. However, programming methodology differs: the AT49F040-12TC uses software command sequences instead of EPROM UV-erasure and VPP-high-voltage programming. The AT49F040-12TC retains the same 32-pin TSOP footprint and signal mapping, preserving board-level interoperability while adding Flash advantages.
AT49F040-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F040-12TC FAQ
1.How can I place an order for AT49F040-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-12TC 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 AT49F040-12TC reliable?
The price and inventory of AT49F040-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-12TC is usually 5 days.
3.What payment methods are accepted for AT49F040-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-12TC?
AT49F040-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-12TC 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 AT49F040-12TC?
For technical support, including AT49F040-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-12TC requirements.
6.How does Aetrix verify that AT49F040-12TC is sourced from the original manufacturer or authorized distributors?
All AT49F040-12TC 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 AT49F040-12TC meets industry standards.
7.What is the process for return or replacement of AT49F040-12TC?
All AT49F040-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-12TC, 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 AT49F040-12TC part is unused and in its original packaging.
Return procedure for AT49F040-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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