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Microchip Technology AT29LV040A-25TI
- Part No.:
- AT29LV040A-25TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29LV040A-25TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,424
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Product details
Overview
AT29LV040A-25TI from Atmel is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC organized as 524,288 words × 8 bits, featuring 2048 independent 256-byte sectors, 150 ns read access time, and software-controlled sector erase/program with boot block lockout. It operates across industrial temperature range (−40°C to +85°C) and supports in-system reprogramming without high-voltage inputs.
For engineers reviewing the AT29LV040A-25TI datasheet, AT29LV040A-25TI pinout, AT29LV040A-25TI application, or AT29LV040A-25TI equivalent, key selection considerations include sector-based programming timing (20 ms max), DATA polling/toggle-bit end-of-program detection, CMOS/TTL-compatible I/O, and dual 16K boot blocks with independent lockout enablement.
Technical Context
The AT29LV040A-25TI implements a sector-erase architecture where each 256-byte sector is erased and programmed in a single internal cycle, using latched address/data and an on-chip timer. Programming requires a three-byte unlock sequence (AAh→55h→A0h) followed by byte loading within 150 µs intervals.
It supports hardware and software data protection: VCC sense (inhibit below 1.8V), 10 ms power-on delay, OE/CE/WE control-line inhibition, and noise filtering (<15 ns pulses rejected). Boot block lockout is enabled via a seven-command algorithm and disables chip erase when activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling firmware storage for mid-complexity embedded controllers |
| Read Access Time | 250 ns max (tACC), compatible with 4 MHz bus timing in industrial systems |
| Supply Voltage | 3.0 V to 3.6 V only - eliminates need for voltage translators in 3.3V systems |
| Active Current | 15 mA max at 5 MHz - enables low-power operation during active reads |
| Standby Current | 50 µA max (industrial temp), reducing quiescent power in always-on applications |
| Endurance | >10,000 program/erase cycles per sector - suitable for field-upgradable firmware |
| Sector Size | 256 bytes - balances granularity of updates with overhead of sector management |
Pinout & Package
AT29LV040A-25TI is available in 32-lead TSOP (Type 1, package code 32T) and 32-lead PLCC (package code 32J); the -TI suffix denotes industrial temperature range and TSOP packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; A8–A18 select sector, A0–A7 select byte within sector |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high-Z output when high |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low write strobe; controls byte load timing and initiates sector programming when combined with CE |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for reads and byte loads; supports DATA polling on I/O7 and toggle-bit detection on I/O6 |
| VCC | Power Supply | 3.0–3.6 V supply; device inhibits programming if VCC < 1.8 V (typical) |
| GND | Ground | Reference for all I/O and internal logic; decoupling required near VCC pin |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet - no pull-up/down or routing |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) prevents accidental writes - essential for robust field firmware updates |
| Dual Boot Block Lockout | Independent 16K-byte lockout for lower (0x00000–0x03FFF) and upper (0x7C000–0x7FFFF) regions - secures bootloader code against overwrite |
| DATA Polling & Toggle Bit | I/O7 complement polling and I/O6 toggling provide real-time, bus-compatible program completion detection without external timers |
| Single-Cycle Sector Erase/Program | Internal erase-and-program automation eliminates external erase step - simplifies host firmware and reduces update latency |
| CMOS/TTL-Compatible I/O | Inputs accept 0–5.5 V; outputs drive 0–3.6 V - allows direct interfacing with mixed-voltage microcontrollers |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory holding boot code, ladder logic, and calibration tables; accessed during cold start and runtime updates. Use Value: 50 µA standby current extends uptime in battery-backed modules; 2048-sector granularity enables partial firmware patching without full reflash. | Use Scenario: Holding certified bootloader and safety-critical initialization routines in Class II medical instruments requiring secure, tamper-resistant startup sequences. IC Role / Device Role / Timing Role: Secure boot memory with lockout-enabled 16K boot blocks preventing unauthorized modification of startup vectors and cryptographic keys. Use Value: Dual boot block lockout ensures immutable bootloader execution; software product identification (manufacturer code 1Fh, device code C4h) enables automated BOM validation. |
| Automotive Infotainment System BIOS | Network Router Configuration Storage |
Use Scenario: Storing BIOS and feature-enabling parameters in automotive head units operating across −40°C to +85°C under ESD-prone conditions. IC Role / Device Role / Timing Role: Read-intensive configuration memory with occasional field updates; interfaces directly to 3.3V microcontroller buses. Use Value: 250 ns read access meets timing budgets for 4 MHz SPI-like parallel bus interfaces; green (Pb/halide-free) packaging complies with automotive RoHS requirements. | Use Scenario: Retaining router configuration, MAC tables, and firmware patches in enterprise-grade networking equipment requiring long-term data retention and remote update capability. IC Role / Device Role / Timing Role: In-system programmable flash memory supporting over-the-air (OTA) firmware upgrades without hardware intervention. Use Value: Sector-based programming allows atomic 256-byte updates to configuration registers; DATA polling enables deterministic host-side update status monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-70-4C-NHE | 4 Mbit, 70 ns access, 3.0–3.6 V, 32-pin TSOP; lacks boot block lockout and uses different unlock sequence | Higher speed but no hardware-secured boot region - unsuitable for safety-critical boot storage | Select when raw read performance >250 ns is required and boot security is managed externally |
| MX29LV040CTTI-70G | 4 Mbit, 70 ns access, 3.0–3.6 V, 32-pin TSOP; includes boot block protection but uses 12-byte unlock command | Same boot block concept but incompatible programming protocol - requires firmware driver rewrite | Choose for drop-in replacement only if existing SST/Atmel drivers can be adapted to Macronix command set |
Compared with SST39VF040-70-4C-NHE and MX29LV040CTTI-70G, the AT29LV040A-25TI provides deterministic 250 ns read timing with integrated boot block lockout and industry-standard three-byte unlock - making it optimal for cost-sensitive industrial designs requiring verified firmware integrity.
Availability
AT29LV040A-25TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive infotainment system BIOS requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29LV040A-25TI 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 AT29LV040A-25TI belongs to Atmel's legacy 3.3V Flash memory product line, designed specifically for in-system programmability in cost-sensitive industrial and automotive applications where reliability, sector-level granularity, and boot security are critical.
FAQ
What is the maximum read access time specification for the AT29LV040A-25TI?
The AT29LV040A-25TI has a maximum read access time (tACC) of 250 ns, as indicated by the "-25" speed grade suffix. This value is guaranteed across the full industrial temperature range (−40°C to +85°C) and 3.0–3.6 V supply, making it suitable for systems with 4 MHz bus timing constraints. The AT29LV040A-25TI datasheet specifies this parameter under AC Read Characteristics with test conditions including CL = 5 pF and f = 5 MHz.
Does the AT29LV040A-25TI support hardware reset or power-on initialization sequences?
The AT29LV040A-25TI does not include an internal hardware reset circuit. However, it incorporates VCC sense and power-on delay features: programming is inhibited if VCC falls below ~1.8 V, and a 10 ms internal timeout occurs after VCC reaches operational level before accepting commands. Per datasheet Note 1, the host system must wait ≥20 ms after VCC stabilization before initiating any mode - this delay ensures reliable AT29LV040A-25TI initialization.
How is boot block lockout enabled and verified on the AT29LV040A-25TI?
Boot block lockout on the AT29LV040A-25TI is enabled via a seven-command software algorithm writing specific values to addresses 5555h, 2AAAh, 5555h, 5555h, 2AAAh, 4000h, and FFFFFh. Verification is performed in Software Product Identification mode: reading address 00002h returns FEh if the lower boot block is unlocked or FFh if locked; reading 7FFF2h yields the same for the upper block. This mechanism is fully implemented in the AT29LV040A-25TI and documented in Section 25 of its datasheet.
Can the AT29LV040A-25TI be used with 5V-tolerant microcontrollers?
Yes - the AT29LV040A-25TI accepts input voltages up to 5.5 V on address and control pins (A0–A18, CE, OE, WE) while operating from a 3.3 V supply, enabling direct interface with 5V-tolerant microcontrollers without level shifters. However, I/O0–I/O7 pins are limited to 0–3.6 V and must not exceed VCC + 0.6 V; connecting them to 5V buses risks damage. This I/O voltage constraint is explicitly defined in the AT29LV040A-25TI's Input Levels section (4.4).
What packaging and temperature range does the "-TI" suffix indicate for the AT29LV040A-25TI?
The "-TI" suffix in AT29LV040A-25TI specifies industrial temperature range (−40°C to +85°C) and 32-lead Thin Small Outline Package (TSOP, Type 1). This matches ordering code AT29LV040A-25TI in Table 26.1, where "TI" maps to 32T package and industrial operation. The AT29LV040A-25TI is not available in PLCC (32J) with "-TI"; that variant uses "-JI". Package dimensions and JEDEC compliance (MO-142, Variation BD) are detailed in Section 27.2 of the AT29LV040A-25TI datasheet.
AT29LV040A-25TI 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:
- 20ms
- Access Time:
- 250 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29LV040A-25TI FAQ
1.How can I place an order for AT29LV040A-25TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-25TI 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 AT29LV040A-25TI reliable?
The price and inventory of AT29LV040A-25TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-25TI is usually 5 days.
3.What payment methods are accepted for AT29LV040A-25TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-25TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-25TI?
AT29LV040A-25TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-25TI 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 AT29LV040A-25TI?
For technical support, including AT29LV040A-25TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-25TI requirements.
6.How does Aetrix verify that AT29LV040A-25TI is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-25TI 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 AT29LV040A-25TI meets industry standards.
7.What is the process for return or replacement of AT29LV040A-25TI?
All AT29LV040A-25TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-25TI, 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 AT29LV040A-25TI part is unused and in its original packaging.
Return procedure for AT29LV040A-25TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV040A-25TI 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
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