Microchip Technology AT25020AN-10SI-1.8

Overview

AT25020AN-10SI-1.8 from Microchip Technology (formerly Atmel) is a 2-Kbit SPI serial EEPROM organized as 256 words × 8 bits, supporting 1.8V to 5.5V supply operation, 20 MHz clock rate at 5V, 8-byte page write mode, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring low-voltage reliability.

For engineers reviewing the AT25020AN-10SI-1.8 datasheet, AT25020AN-10SI-1.8 pinout, AT25020AN-10SI-1.8 application, or AT25020AN-10SI-1.8 equivalent, key selection criteria include VCC range (1.8–5.5V), page write capability, block protection granularity (1/4, 1/2, or full array), HOLD/CS timing behavior, and SO/SI signal integrity under 20 MHz SCK.

Technical Context

The AT25020AN-10SI-1.8 implements a synchronous SPI slave interface with fixed MSB-first transmission, supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), and uses an internal instruction register to decode op-codes including READ (0x03), WRITE (0x02), WREN (0x06), WRDI (0x04), RDSR (0x05), and WRSR (0x01). All write cycles are self-timed with max 5 ms duration and require prior WREN activation unless overridden by WP pin state.

Block write protection is controlled by nonvolatile BP1/BP0 bits in the status register, enabling selective locking of memory segments-e.g., BP1=1/BP0=0 protects the upper half (0x80–0xFF) of the 256-byte array. The HOLD pin suspends ongoing serial transfers without resetting the sequence, provided it is asserted while SCK is low.

Key Specifications

Pinout & Package

AT25020AN-10SI-1.8 is packaged in an 8-lead JEDEC SOIC (8S1), 0.150" wide body, with gull-wing leads and RoHS-compliant lead-free/halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with M95256-WMN6TP and BR25G256FJ-3GE2, the AT25020AN-10SI-1.8 offers optimal balance of ultra-low-voltage operation (1.8V), compact 2-Kbit density, and proven industrial qualification-making it ideal for space- and power-constrained embedded controllers where larger EEPROMs introduce unnecessary cost and complexity.

Availability

AT25020AN-10SI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy meter firmware requiring stable component supply across extended temperature and low-voltage operating conditions.

Supply support for AT25020AN-10SI-1.8 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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with broad industrial and automotive qualifications.

The AT25020AN-10SI-1.8 belongs to Microchip's AT25xxx family of SPI EEPROMs, designed specifically for robust, low-power, and low-voltage nonvolatile data storage in resource-constrained embedded systems.

FAQ

What is the memory organization of the AT25020AN-10SI-1.8?

The AT25020AN-10SI-1.8 contains 2048 bits of serial EEPROM memory, organized as 256 words × 8 bits. This structure allows byte-aligned read/write access and supports efficient page writes of up to 8 bytes per command. The AT25020AN-10SI-1.8 uses a linear address space from 0x00 to 0xFF, with no internal bank switching required.

Does the AT25020AN-10SI-1.8 support both SPI Mode 0 and Mode 3?

Yes, the AT25020AN-10SI-1.8 supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in its official datasheet. The AT25020AN-10SI-1.8 operates exclusively as a slave device and relies on the master to configure clock polarity and phase. Mode 0 operation is fully documented with timing diagrams.

How does write protection work on the AT25020AN-10SI-1.8?

The AT25020AN-10SI-1.8 implements dual-layer write protection: hardware-based via the WP pin (low = all writes inhibited), and software-based via BP1/BP0 bits in the status register. These bits define four protection levels (none, 1/4, 1/2, or full array), and their values persist through power cycles. The AT25020AN-10SI-1.8 requires WREN before any status register change.

What is the maximum clock frequency supported by the AT25020AN-10SI-1.8 at 1.8V?

At VCC = 1.8V, the AT25020AN-10SI-1.8 supports up to 5 MHz SCK frequency, as specified in Table 4 of the datasheet under "1.8–5.5V" voltage column. While the device achieves 20 MHz at 5V, timing margins tighten at lower voltages, and 5 MHz is the guaranteed maximum for reliable operation across temperature and process variation.

Is the AT25020AN-10SI-1.8 compatible with 1.8V logic interfaces without level shifting?

Yes, the AT25020AN-10SI-1.8 is fully compatible with 1.8V logic interfaces: its VIH min is 0.7×VCC (≥1.26V at 1.8V) and VIL max is 0.3×VCC (≤0.54V), meeting standard 1.8V CMOS thresholds. Inputs tolerate up to 7.0V, but for reliable interoperability, drive signals should remain within 0–1.8V. The AT25020AN-10SI-1.8 outputs VOH ≥VCC−0.2V and VOL ≤0.2V at 1.8V, ensuring clean logic levels.