AT29LV040A-20TC

AT29LV040A-20TC is a 4‑Megabit, low‑voltage parallel flash memory from Atmel (now Microchip). It stores firmware and data for embedded systems and is commonly used as program memory for microcontrollers. Organization is 512K × 8, and it operates from a 2.7–3.6 V supply. The “-20” suffix indicates a 20 ns typical access time. The device uses a standard 8‑bit parallel interface with Chip Enable (CE), Output Enable (OE), and Write Enable (WE), plus address inputs to select locations. Features typically include byte/word programming and sector/block erase, with basic protection options and straightforward read/write timing. The “-TC” suffix denotes the package/temperature/transport option defined in the datasheet (for example, a specific tape‑and‑reel or commercial grade package). Typical applications are boot ROMs, firmware storage, and data logging in embedded systems where fast random read access and non‑volatile storage are required. In short: a fast, 4‑Mbit, low‑voltage parallel flash memory suitable for replacing older parallel flash in embedded designs.

Equivalent parts (4-Mbit, 5V parallel NOR Flash with similar pinout):
- AM29LV040 (AMD/Spansion heritage)
- MX29LV040 (Macronix)
- S29GL040 (Spansion/Cypress)
- SST39SF040 (SST)
Packaging/timing variants exist (e.g., TC/CB/TSSOP).

Key features of AT29LV040A-20TC (concise):
- 4 Mbit flash memory (NOR type)
- 5V operation
- Access time: 20 ns (typical)
- Data bus: 8-bit (single-ended I/O)
- Random read; asynchronous interface
- Byte/word programming; sector/block erase and chip erase
- In-system programming capability with standard control signals (CE, OE, WE, PGM)
- Hardware protection options (block protect and software write protection)
- Endurance typically in the 10^4–10^5 erase/program cycles range
- Data retention often rated around 20 years
- Low-power standby mode
Note: exact organization (R/W width, block sizes) and temperature range can vary by package/lot; refer to the official datasheet for precise specifications and packaging options.

- Pin count: 8 pins (8-pin package).
- Function: 4-Mbit SPI-compatible serial flash memory (non-volatile) for storing firmware/data. Pins typically include CS, SCK, SI, SO, WP, HOLD, Vcc, GND.

Manufacturer: Atmel Corporation. What kind of company: A semiconductor company that designs and manufactures memory (including flash) and microcontrollers; now part of Microchip Technology (acquired in 2016).

Applications of AT29LV040A-20TC include:
- Embedded systems: non-volatile program storage for microcontrollers and SoCs
- In-system/field firmware updates and boot memory (firmware banks)
- Automotive ECUs and industrial controllers requiring reliable flash storage
- Networking gear, printers, set-top boxes, and other consumer electronics for firmware and configuration data
- Data logging and parameter storage in portable devices and smart meters
These use cases leverage its 4-Mbit non-volatile flash as code storage, parameter/data retention, and upgrade-friendly memory.

28-pin surface-mount SOIC (Plastic) package.