My Inquiry
My Account
Microchip Technology AT29LV040A-20TI
- Part No.:
- AT29LV040A-20TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29LV040A-20TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,543
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT29LV040A-20TI from Atmel is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC organized in 2048 sectors of 256 bytes each, featuring 200 ns max read access time, 20 ms max sector program cycle, and dual 16K-byte boot blocks with independent programming lockout. It operates across -40°C to +85°C for industrial embedded firmware storage and BIOS/UEFI code retention.
For engineers reviewing the AT29LV040A-20TI datasheet, AT29LV040A-20TI pinout, AT29LV040A-20TI application, or AT29LV040A-20TI equivalent, key selection criteria include sector-based reprogrammability, software data protection compliance, boot block lockout verification, and compatibility with 3.3V microcontroller buses requiring low-active current (15 mA) and CMOS standby (50 µA).
Technical Context
The AT29LV040A-20TI implements sector-erase-and-program architecture with internal address/data latches for 256-byte loads, eliminating external buffering. Its software data protection requires a three-byte command sequence (AAh→55h→A0h at specific addresses) before any sector write, preventing accidental overwrites during power transitions or noise events.
Hardware protection includes VCC sense (<1.8V inhibits programming), 10 ms power-on delay, and noise filtering (<15 ns pulses ignored on WE/CE). DATA polling on I/O7 and toggle-bit detection on I/O6 provide deterministic end-of-program signaling without external timers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full BIOS/firmware images in single-package footprint |
| Read Access Time | 200 ns max - meets timing for 5 MHz bus operation with margin |
| Sector Size | 256 bytes - aligns with typical bootloader update granularity and minimizes erase overhead |
| Program Cycle Time | 20 ms max per sector - supports field firmware updates without system freeze |
| Endurance | >10,000 write/erase cycles per sector - sufficient for lifetime field upgrades |
| VCC Supply Range | 3.0V–3.6V - compatible with standard 3.3V logic rails and eliminates need for charge pumps |
| Operating Temp | -40°C to +85°C - qualified for industrial control, automotive body electronics, and networking equipment |
| Standby Current | 50 µA max (industrial) - enables low-power sleep modes in battery-backed systems |
Pinout & Package
AT29LV040A-20TI is available in 32-lead TSOP (Type 1) package, measuring 20.0 mm × 8.0 mm × 1.2 mm, with gull-wing leads and JEDEC MO-142 BD compliance. Pin 1 identifier located at top-left corner when viewed from top with marking dot oriented upper-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within 256-byte sector |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high disables outputs to high-Z state |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low write strobe; initiates byte load or program cycle when CE low and OE high |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for reads/writes; I/O7 used for DATA polling, I/O6 for toggle-bit status |
| VCC | Power Supply | 3.3V ±10% supply; powers core logic and I/O buffers; internal VCC sense prevents programming below 1.8V |
| GND | Ground Reference | Signal and power ground reference plane; decoupling capacitor required near VCC pin |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid latch-up or parametric shift |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every sector program - prevents accidental writes during reset or ESD events |
| Dual Boot Block Lockout | Independent 16K-byte lockout for lower (0x00000–0x03FFF) and upper (0x7C000–0x7FFFF) memory regions - secures bootloader and recovery firmware |
| DATA Polling & Toggle Bit | I/O7 complement-read and I/O6 toggling provide real-time, bus-compatible program completion detection - eliminates need for fixed delays or external controllers |
| Single-Cycle Sector Reprogram | Internal erase-and-program automation after 256-byte load - simplifies host firmware by abstracting timing-critical erase steps |
| CMOS/TTL Input Compatibility | Inputs accept 0–5.5V while powered from 3.3V - allows direct interfacing with 5V microcontrollers without level shifters |
| Green Packaging Option | Pb/Halide-free TSOP variant available - satisfies RoHS compliance requirements for industrial and medical end equipment |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing programmable logic controller firmware updated via RS-485 or CAN bus in factory automation cabinets exposed to wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level reprogrammability and boot block lockout to preserve startup routines during field updates. Use Value: 20 ms sector programming enables <100 ms firmware patch application; -40°C to +85°C rating ensures reliability in unconditioned control panels. | Use Scenario: Holding configuration data and calibration tables for door module ECUs subjected to thermal cycling and vibration. IC Role / Device Role / Timing Role: Parameter storage with hardware/software write protection preventing corruption during vehicle cranking (VCC dip) or EMI events. Use Value: VCC sense and 10 ms power-on delay prevent spurious writes during battery transients; 50 µA standby current extends battery life in sleep mode. |
| Network Router Boot Image | Medical Diagnostic Equipment BIOS |
Use Scenario: Storing primary boot image and fail-safe recovery firmware in enterprise-grade routers requiring zero-downtime firmware upgrades. IC Role / Device Role / Timing Role: Dual boot block architecture isolates critical startup code from user-updatable application partitions. Use Value: Independent lockout of lower and upper 16K blocks ensures recovery image remains intact even if main firmware is corrupted during OTA update. | Use Scenario: Retaining UEFI BIOS and hardware initialization sequences in portable ultrasound and imaging devices certified to IEC 60601-1. IC Role / Device Role / Timing Role: Certified nonvolatile memory with >10,000 endurance cycles supporting regulatory-mandated field calibration and software revision logging. Use Value: Green (Pb/Halide-free) packaging meets medical device material restrictions; DATA polling enables deterministic boot-time firmware validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-EKE | 70 ns read access, 5V-tolerant inputs, same 4 Mbit density and 256-byte sectors | Lacks boot block lockout; uses different software unlock sequence (5555h/2AAAh/5555h vs. SST's 5555h/2AAAh/5555h/A0h) | Select when faster read speed is prioritized over secure boot partitioning |
| MX29LV400CBTI-70G | 70 ns read access, 3.3V-only, identical pinout and boot block structure (two 16K blocks) | Requires different unlock command (5555h/2AAAh/5555h/20h); endurance rated at 100,000 cycles vs. 10,000 | Choose for higher endurance requirements where MXIC qualification is preferred |
Compared with AT29LV040A-20TI, SST39VF400A offers faster read performance but no boot block lockout, while MX29LV400CBTI provides 10× higher endurance and identical security features-both require firmware adaptation for command sequence differences.
Availability
AT29LV040A-20TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive BCM parameter retention, and network router boot image applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29LV040A-20TI 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 secure authentication ICs.
The AT29LV040A product line delivers cost-effective, industrial-grade Flash memory for embedded firmware and boot code storage, designed specifically for systems requiring in-system reprogrammability without high-voltage programming circuitry.
FAQ
What is the maximum read access time specified for the AT29LV040A-20TI?
The AT29LV040A-20TI has a maximum read access time of 200 ns, measured from address valid to valid data output under industrial temperature conditions (-40°C to +85°C) and 3.3V supply. This specification ensures compatibility with 5 MHz system buses and provides timing margin for signal propagation delays in dense PCB layouts. The "-20" suffix explicitly denotes this 200 ns speed grade, distinguishing it from the -15 (150 ns) and -25 (250 ns) variants.
Does the AT29LV040A-20TI support true 3.3V-only operation without requiring 5V or 12V programming voltages?
Yes, the AT29LV040A-20TI operates exclusively from a 3.0V–3.6V supply for both read and write functions. It eliminates the need for external high-voltage generators by using internal charge pumps triggered only during sector programming. All software commands-including the three-byte unlock sequence and byte-load operations-are executed using standard 3.3V logic levels, making it compatible with modern low-voltage microcontrollers and simplifying board-level power design.
How does the boot block lockout feature work on the AT29LV040A-20TI?
The AT29LV040A-20TI contains two dedicated 16K-byte boot blocks-one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF)-each independently configurable for permanent write protection. Activation requires a seven-command sequence to specific addresses; once enabled, the locked block cannot be erased or programmed, even by chip-erase commands. Reading location 00002H or 7FFF2H in software identification mode returns FEh (unlocked) or FFh (locked), allowing runtime verification of protection status.
Can the AT29LV040A-20TI be interfaced directly with a 5V microcontroller without level-shifting circuitry?
Yes, the AT29LV040A-20TI accepts input voltages up to 5.5V on address and control pins (A0–A18, CE, OE, WE) while operating from a 3.3V supply, per its DC characteristics table. This allows direct connection to 5V-tolerant microcontroller GPIOs. However, I/O0–I/O7 pins are limited to 0–3.6V and must not exceed VCC + 0.6V; therefore, bidirectional data lines require level translation if the host MCU drives 5V logic levels onto the data bus.
What methods are available to detect program completion on the AT29LV040A-20TI?
The AT29LV040A-20TI provides two hardware-supported methods: DATA polling on I/O7 (complement of loaded data during programming, true data upon completion) and toggle-bit detection on I/O6 (repeated reads cause I/O6 to alternate until programming ends). Both methods operate concurrently and can be initiated at any time during the 20 ms sector program cycle. No external timer or fixed delay is required, enabling deterministic, bus-efficient firmware update routines.
AT29LV040A-20TI 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:
- 200 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-20TI FAQ
1.How can I place an order for AT29LV040A-20TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-20TI 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-20TI reliable?
The price and inventory of AT29LV040A-20TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-20TI is usually 5 days.
3.What payment methods are accepted for AT29LV040A-20TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-20TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-20TI?
AT29LV040A-20TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-20TI 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-20TI?
For technical support, including AT29LV040A-20TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-20TI requirements.
6.How does Aetrix verify that AT29LV040A-20TI is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-20TI 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-20TI meets industry standards.
7.What is the process for return or replacement of AT29LV040A-20TI?
All AT29LV040A-20TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-20TI, 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-20TI part is unused and in its original packaging.
Return procedure for AT29LV040A-20TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV040A-20TI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
