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Microchip Technology AT29C040A-90TU-T
- Part No.:
- AT29C040A-90TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C040A-90TU-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,775
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Product details
Overview
AT29C040A-90TU-T from Atmel is a 4-Mbit (512K × 8) 5-volt-only Flash memory IC organized in 2048 sectors of 256 bytes each, featuring 90 ns read access time, sector-based reprogramming, and hardware/software data protection. It operates across -40°C to +85°C and supports in-system programming for embedded boot code storage.
For engineers reviewing the AT29C040A-90TU-T datasheet, AT29C040A-90TU-T pinout, AT29C040A-90TU-T application, or AT29C040A-90TU-T equivalent, key selection criteria include sector erase granularity, 5V-only operation, boot block lockout capability, DATA polling/toggle bit status detection, and PLCC/TSOP package compatibility with legacy industrial controllers.
Technical Context
The AT29C040A-90TU-T implements a sector-program architecture where each 256-byte sector is erased and programmed in a single internal cycle using an on-chip timer. Address latching occurs on CE or WE falling edge, and data latching on the subsequent rising edge - enabling bus release during load phases.
It integrates dual protection layers: hardware-level VCC sense (inhibit below 3.8 V), noise filtering (<15 ns pulse rejection), and software-controlled data protection via three-byte unlock sequences. Boot block lockout applies independently to two 16K-byte regions at memory extremes, disabling chip erase if either is activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for firmware images up to ~64 KB in size |
| Read Access Time | 90 ns maximum - enables direct execution from flash in timing-critical microcontroller boot paths |
| Sector Size | 256 bytes - allows fine-grained firmware updates without erasing full device |
| Program Cycle Time | 10 ms per sector - deterministic reprogramming latency for field-upgrade routines |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails |
| Endurance | >10,000 program/erase cycles per sector - supports long-life industrial logging or configuration storage |
| Standby Current | 100 µA CMOS - suitable for low-power wake-on-event systems |
| Operating Temp | -40°C to +85°C - qualified for industrial control and automotive under-hood auxiliary modules |
Pinout & Package
AT29C040A-90TU-T is packaged in a 32-lead Thin Small Outline Package (TSOP Type 1), compliant with JEDEC MO-142 BD. Pin pitch is 0.50 mm, body dimensions are 20.00 × 8.00 × 1.20 mm (L × W × H), and lead coplanarity is ≤0.10 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within sector, A8–A18 select sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with standard microcontroller data buses; supports byte load and DATA polling on I/O7 |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high disables outputs and enters standby mode |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention; must be high during programming |
| WE | Write Enable | Active-low write strobe; controls byte loading and initiates internal program cycle when toggled with CE low and OE high |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O drivers; VCC sense circuitry inhibits programming if below 3.8 V |
| GND | Ground Reference | Signal and power ground reference; decoupling required near VCC pin for stable read/write timing |
| NC | No Connect | Unbonded pin; must remain unconnected to avoid unintended coupling or leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for +12 V programming supplies - simplifies system power design and reduces BOM count |
| DATA Polling & Toggle Bit | Enables real-time program completion detection without external timers or interrupts - improves firmware update reliability |
| Two Independent Boot Blocks | 16K-byte protected regions at 0x00000 and 0x7C000 allow secure bootloader storage with hardware-enforced write lockout |
| Hardware Data Protection | VCC sensing, 5 ms power-on delay, and noise filtering prevent spurious writes during brown-out or EMI events |
| Green Pb/Halide-free Packaging | Meets RoHS Directive 2011/65/EU - supports compliance for global industrial and medical equipment shipments |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing fast 90 ns read access to initialize FPGA or MCU upon power-up; sector erase enables field updates without full reflash. Use Value: Boot block lockout prevents accidental overwrites of critical startup routines, while 10,000-cycle endurance ensures multi-year operation without degradation. | Use Scenario: Holding bootloader and minimal OS image in network infrastructure devices requiring secure, field-upgradable firmware with tamper resistance. IC Role / Device Role / Timing Role: Primary Flash memory mapped into CPU address space; supports software product identification to auto-detect density and sector layout during initialization. Use Value: Dual protection (hardware VCC sense + software unlock sequence) blocks unauthorized firmware modifications, meeting IEC 62443-3-3 SL2 requirements for secure boot. |
| Automotive Body Control Module | Medical Diagnostic Equipment Configuration |
Use Scenario: Retaining calibration tables and diagnostic logs in under-dash BCMs operating across -40°C to +85°C ambient conditions. IC Role / Device Role / Timing Role: Sector-erasable Flash memory interfaced directly to 8-bit microcontroller bus; DATA polling used to synchronize firmware patching with CAN message scheduling. Use Value: 100 µA standby current minimizes battery drain during vehicle sleep modes; green packaging satisfies OEM environmental compliance mandates. | Use Scenario: Storing device-specific calibration coefficients and regulatory audit trails in FDA-cleared diagnostic imaging systems requiring traceable firmware revisions. IC Role / Device Role / Timing Role: Trusted nonvolatile storage for configuration parameters; software data protection prevents unauthorized changes during service technician access. Use Value: Sector-level granularity enables versioned parameter updates without risking corruption of operational firmware - critical for 21 CFR Part 11 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90EC | 4 Mbit, 90 ns, 3.3 V core with 5 V I/O tolerance; requires VPP = 12 V for programming | Not 5V-only; incompatible with pure 5V systems lacking VPP generation | Select only if migrating to lower-voltage core logic and adding VPP circuitry |
| SST39VF400A-90-4C-NHE | 4 Mbit, 90 ns, 3.3 V supply; supports byte-write and block-erase; no boot block lockout | Lacks dedicated boot protection; requires external security layer for secure boot | Prefer for new 3.3 V designs needing faster random writes, but not for legacy 5V boot-critical systems |
Compared with AM29LV040B-90EC and SST39VF400A-90-4C-NHE, the AT29C040A-90TU-T uniquely delivers true 5V-only operation with integrated boot block lockout and hardware VCC sensing - making it the only drop-in replacement for legacy industrial controllers requiring zero-voltage-change firmware upgrades.
Availability
AT29C040A-90TU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, and automotive body control module applications requiring stable component supply and long-term lifecycle support.
Supply support for AT29C040A-90TU-T 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, automotive, and consumer applications.
The AT29C040A-90TU-T belongs to Atmel's 5-volt-only Flash family designed specifically for in-system reprogrammability in legacy 5V embedded systems - emphasizing simplicity, robustness, and compatibility with EPROM-style interfaces.
FAQ
What is the maximum read access time specified for the AT29C040A-90TU-T?
The AT29C040A-90TU-T has a maximum read access time of 90 ns, measured from address valid to valid data on I/O0–I/O7. This timing is guaranteed across the full industrial temperature range (-40°C to +85°C) and 5 V ±10% supply, enabling direct execution from flash in time-constrained boot sequences. The value is confirmed in the AC Read Characteristics table of the official Atmel datasheet 0333L–FLASH–9/08.
Does the AT29C040A-90TU-T require high-voltage programming signals?
No, the AT29C040A-90TU-T does not require high-voltage programming signals. It operates with 5 V ±10% only - no VPP or 12 V supply is needed. Programming is initiated via standard 5 V logic-level commands (e.g., three-byte unlock sequences), and internal circuitry handles voltage translation and timing. This eliminates external charge pumps or voltage boosters, simplifying board design and reducing cost.
How many sectors does the AT29C040A-90TU-T contain, and what is the size of each sector?
The AT29C040A-90TU-T contains 2048 sectors, each sized at 256 bytes. This structure supports granular firmware updates - modifying one sector does not affect others. Sector addressing uses A8–A18, while A0–A7 select the byte within the sector. The 256-byte granularity is fixed and confirmed in the "Sector Program Operation" section of the datasheet.
Can the AT29C040A-90TU-T be used in systems requiring secure boot functionality?
Yes, the AT29C040A-90TU-T supports secure boot through its two independent 16K-byte boot blocks with programmable lockout. Once enabled via the documented 7-command algorithm, these blocks (at addresses 0x00000 and 0x7C000) become permanently write-protected. This prevents unauthorized modification of bootloader code, and the feature is retained across power cycles - a key requirement for certified secure boot implementations.
What package type is used for the AT29C040A-90TU-T, and is it RoHS-compliant?
The AT29C040A-90TU-T uses a 32-lead Thin Small Outline Package (TSOP Type 1), designated as "32T" in Atmel's ordering information. It is RoHS-compliant and offered in a green (Pb/halide-free) packaging option, meeting EU Directive 2011/65/EU. Package dimensions are 20.00 × 8.00 × 1.20 mm, with 0.50 mm lead pitch and JEDEC MO-142 BD compliance.
AT29C040A-90TU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 10ms
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29C040A-90TU-T FAQ
1.How can I place an order for AT29C040A-90TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-90TU-T 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 AT29C040A-90TU-T reliable?
The price and inventory of AT29C040A-90TU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-90TU-T is usually 5 days.
3.What payment methods are accepted for AT29C040A-90TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-90TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-90TU-T?
AT29C040A-90TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-90TU-T 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 AT29C040A-90TU-T?
For technical support, including AT29C040A-90TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-90TU-T requirements.
6.How does Aetrix verify that AT29C040A-90TU-T is sourced from the original manufacturer or authorized distributors?
All AT29C040A-90TU-T 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 AT29C040A-90TU-T meets industry standards.
7.What is the process for return or replacement of AT29C040A-90TU-T?
All AT29C040A-90TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-90TU-T, 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 AT29C040A-90TU-T part is unused and in its original packaging.
Return procedure for AT29C040A-90TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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