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Microchip Technology AT29C040A-90TI
- Part No.:
- AT29C040A-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C040A-90TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,476
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Product details
Overview
AT29C040A-90TI 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, 10 ms sector program cycle, and hardware/software data protection. It supports in-system reprogramming without high-voltage programming and is used in embedded boot code storage for industrial microcontroller systems.
For engineers reviewing the AT29C040A-90TI datasheet, AT29C040A-90TI pinout, AT29C040A-90TI application, or AT29C040A-90TI equivalent, key selection considerations include its 5V-only operation, dual 16K-byte boot block lockout, DATA polling and TOGGLE BIT end-of-program detection, and industrial temperature range (−40°C to +85°C) in TSOP package.
Technical Context
The AT29C040A-90TI implements sector-based flash architecture with internal address/data latches for 256-byte page loading and automatic erase-before-program sequencing. Its control logic responds to CE/OE/WE timing per JEDEC-compliant byte-load and program waveforms, supporting both hardware and software product identification modes.
It integrates dual independent 16K-byte boot blocks with programmable lockout via seven-command algorithm, and provides two end-of-program detection methods: DATA polling on I/O7 and TOGGLE BIT behavior on I/O6 - both usable at any point during programming without bus suspension.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity MCUs |
| Read Access Time | 90 ns - meets real-time boot latency requirements in industrial controllers |
| Sector Size | 256 bytes - allows fine-grained firmware updates without erasing full device |
| Program Cycle Time | 10 ms per sector - enables predictable field update windows in production test systems |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications |
| Endurance | >10,000 write/erase cycles - supports long-life field firmware upgrades |
| Standby Current | 100 µA (CMOS) - minimizes power in always-on system monitoring modes |
Pinout & Package
AT29C040A-90TI is packaged in a 32-lead Thin Small Outline Package (TSOP Type 1, package code 32T), measuring 20 mm × 8 mm with 0.5 mm lead pitch. Pin 1 is marked by a beveled corner or notch on the top surface.
| 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 |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for TOGGLE BIT status |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output control; enables data output only when CE is also low |
| WE | Write Enable | Active-low write control; initiates byte load or program cycle when CE is low and OE is high |
| VCC | Power Supply | +5 V ±10% supply; powers all internal logic and charge pumps |
| GND | Ground | Reference for all input thresholds and output drive levels |
| NC | No Connect | Unbonded pin; must remain unconnected per Atmel design |
Key Features
| Feature | Design Value |
|---|---|
| 5-V-only sector programming | Eliminates external high-voltage generator; simplifies PCB layout and reduces BOM count |
| Dual 16K-byte boot block lockout | Prevents accidental overwrite of critical startup code in lower/upper memory regions |
| Hardware + software data protection | VCC sense, noise filtering, and 3-byte unlock sequence prevent spurious writes during power transitions |
| DATA polling & TOGGLE BIT | Enables host MCU to detect program completion without fixed delays or external timers |
| Internal program timer & latch | Allows host to release address/data bus after loading 256 bytes, improving system concurrency |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing bootloader and configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 90 ns read access during cold start and secure 10 ms sector updates during field maintenance. Use Value: Dual boot block lockout ensures safety-critical initialization code remains unaltered across firmware revisions. | Use Scenario: Holding certified diagnostic firmware and calibration tables in portable ultrasound and infusion pump systems. IC Role / Device Role / Timing Role: Industrial-temperature-rated Flash memory delivering reliable code execution and verified 10,000-cycle endurance for regulatory-compliant lifecycle management. Use Value: Hardware VCC-sense protection prevents corruption during brown-out conditions common in battery-backed medical equipment. |
| Telecom Base Station Configuration | Automotive ECU Calibration Storage |
Use Scenario: Storing radio parameter sets and protocol stack configurations in remote radio units operating in outdoor enclosures. IC Role / Device Role / Timing Role: Sector-erasable Flash enabling over-the-air updates of RF tuning tables without disrupting active signal processing. Use Value: DATA polling allows host DSP to initiate next-sector load immediately upon confirmation - reducing total update time by >30% vs. fixed-timing schemes. | Use Scenario: Retaining engine calibration maps and emission control parameters in engine control units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Automotive-qualified (industrial temp range) nonvolatile memory with CMOS standby current ≤100 µA for low-power sleep mode compliance. Use Value: Software data protection prevents unauthorized map modification via diagnostic port, satisfying ISO 15765-3 security requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV400CBTI-90G | 3.3 V core with 5 V tolerant I/O; 90 ns access; 4 Mbit, same sector size | Requires level-shifting in pure 5 V systems; lacks boot block lockout | Preferred for new designs migrating to 3.3 V domains with mixed-voltage interfaces |
| SST39VF400A-90-4C-NHE | 5 V only; 90 ns access; 4 Mbit; no boot block lockout; different command set | Software data protection requires vendor-specific unlock sequence; no hardware VCC sense | Valid alternative where boot block security is not required and legacy SST toolchain is in use |
Compared with AT29C040A-90TI, MX29LV400CBTI-90G offers lower power but mandates voltage translation, while SST39VF400A-90-4C-NHE matches voltage and speed but omits boot block lockout and hardware write inhibition - making AT29C040A-90TI uniquely suited for safety-critical industrial boot storage.
Availability
AT29C040A-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, telecom base station configuration, and automotive ECU calibration storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29C040A-90TI 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, nonvolatile memory, and secure authentication devices.
The AT29C040A-90TI belongs to Atmel's 5-volt-only Flash memory product line, designed specifically for in-system programmability in industrial and embedded applications where high reliability, sector-level granularity, and robust data protection are mandatory.
FAQ
What is the operating temperature range for the AT29C040A-90TI?
The AT29C040A-90TI is rated for industrial operation from −40°C to +85°C. This range is confirmed in the Ordering Information table and DC Operating Range section of the official datasheet. The 'I' suffix in AT29C040A-90TI explicitly denotes industrial temperature grade, distinguishing it from commercial-grade variants like AT29C040A-90JC. This specification ensures reliable performance in harsh environments such as factory floors and outdoor telecom cabinets.
Does the AT29C040A-90TI support true 5-volt-only programming without external high voltage?
Yes, the AT29C040A-90TI supports true 5-volt-only programming: no external VPP or high-voltage generator is required. Programming is initiated using standard 5 V logic levels applied to CE, WE, and OE pins in precise sequences (e.g., AAh/55h/A0h for sector program). This capability is explicitly stated in the Features list and Device Operation section, enabling simplified system design and eliminating dedicated programming power supplies.
How does the boot block lockout feature work on the AT29C040A-90TI?
The AT29C040A-90TI includes two independent 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each can be permanently locked against programming using a seven-command enable algorithm. Once activated, the locked block cannot be erased or written, even by chip erase. Lockout status is readable via software product identification mode at addresses 0x00002 (lower) and 0x7FFF2 (upper).
What are the end-of-program detection methods supported by the AT29C040A-90TI?
The AT29C040A-90TI supports two hardware-confirmed end-of-program detection methods: DATA polling on I/O7 (returns complement of loaded data until completion) and TOGGLE BIT on I/O6 (toggles between 0 and 1 during programming, then stabilizes). Both methods are usable at any time during the 10 ms program cycle and require no additional timing margins - enabling efficient host MCU resource utilization without fixed delays.
Is the AT29C040A-90TI pin-compatible with other members of the AT29C040A family?
Yes, all AT29C040A variants - including AT29C040A-90TI, AT29C040A-12TI, AT29C040A-15TI, and AT29C040A-20TI - share identical pinout, package footprint, and command set. The numeric suffix (90/12/15/20) indicates maximum access time in nanoseconds, and the final letter (T/I) specifies package (TSOP) and temperature grade (Industrial). This allows direct speed-grade substitution without PCB redesign.
AT29C040A-90TI 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:
- 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-90TI FAQ
1.How can I place an order for AT29C040A-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-90TI 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-90TI reliable?
The price and inventory of AT29C040A-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-90TI is usually 5 days.
3.What payment methods are accepted for AT29C040A-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-90TI?
AT29C040A-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-90TI 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-90TI?
For technical support, including AT29C040A-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-90TI requirements.
6.How does Aetrix verify that AT29C040A-90TI is sourced from the original manufacturer or authorized distributors?
All AT29C040A-90TI 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-90TI meets industry standards.
7.What is the process for return or replacement of AT29C040A-90TI?
All AT29C040A-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-90TI, 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-90TI part is unused and in its original packaging.
Return procedure for AT29C040A-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C040A-90TI Tags
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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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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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