Microchip Technology AT25P1024C1-10CI-2.7

Overview

AT25P1024C1-10CI-2.7 from Atmel is a 1 Mbit (131,072 × 8) SPI serial EEPROM optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports SPI Modes 0 and 3, delivers up to 2.1 MHz clock rate, features 128-byte page-write-only operation, and provides hardware/software write protection via WP pin and status register control.

For engineers reviewing the AT25P1024C1-10CI-2.7 datasheet, AT25P1024C1-10CI-2.7 pinout, AT25P1024C1-10CI-2.7 application, or AT25P1024C1-10CI-2.7 equivalent, key selection considerations include its 20-lead SOIC or 8-lead LAP packaging options, block write protection granularity (1/4, 1/2, or full array), self-timed 5 ms typical write cycle, and 100,000 write endurance with >40-year data retention.

Technical Context

The AT25P1024C1-10CI-2.7 implements a synchronous SPI slave interface with separate SI/SO pins, MSB-first data framing, and op-code–driven command execution (WREN, WRITE, RDSR, WRSR). It requires explicit Write Enable before programming and returns to write-disable state post-write.

Its status register (8-bit) controls Block Protect (BP0/BP1), Write Enable Latch (WEN), Ready/Busy (RDY), and Write Protect Enable (WPEN). Hardware write protection is conditional on both WP pin state and WPEN bit; when enabled, it locks status register writes and protected memory segments while allowing unprotected regions to remain writable.

Key Specifications

Pinout & Package

AT25P1024C1-10CI-2.7 is packaged in a 20-lead JEDEC SOIC (20S2), 0.300" wide, plastic gull-wing outline per MS-013 variation AC. Pin 1 is marked by a notch or dot; leads are spaced at 0.050" (1.27 mm) pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25P1024C1-10CI-2.7, M95M01-RDW6TP/K offers faster read throughput but omits HOLD for SPI suspension, while 25AA1024-I/P provides identical SPI mode support in through-hole format but removes dedicated hardware write protection - making AT25P1024C1-10CI-2.7 optimal for industrial designs requiring both suspend capability and dual-layer (HW+SW) write security.

Availability

AT25P1024C1-10CI-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply, long-term data retention, and robust write protection.

Supply support for AT25P1024C1-10CI-2.7 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 wireless solutions.

The AT25P1024 series was designed specifically for SPI-based embedded systems needing reliable, low-voltage serial EEPROM with configurable memory protection and industrial temperature operation.

FAQ

What is the maximum SPI clock frequency supported by the AT25P1024C1-10CI-2.7?

The AT25P1024C1-10CI-2.7 supports up to 2.1 MHz SPI clock frequency across its full 2.7 V to 5.5 V supply range. This value is specified in the AC Characteristics table under fSCK parameter and applies to both read and write operations. The device maintains timing compliance down to 2.7 V, eliminating need for voltage scaling when operating at lower supply rails.

Does the AT25P1024C1-10CI-2.7 support individual byte writes?

No, the AT25P1024C1-10CI-2.7 supports page writes only - specifically 128-byte aligned writes. Attempting byte-level writes will not program the memory reliably. The datasheet explicitly states "128-byte Page Mode Only for Write Operations" and warns that content is not guaranteed if fewer than 128 bytes are transmitted in a single WRITE instruction.

How does hardware write protection work on the AT25P1024C1-10CI-2.7?

Hardware write protection on the AT25P1024C1-10CI-2.7 requires both the WP pin to be driven low AND the WPEN bit in the status register to be set to '1'. When active, this combination disables writes to the status register (including BP0/BP1 and WPEN itself) and to memory blocks covered by the current block protection level. If WPEN = 0, the WP pin has no effect.

What package type is used for the AT25P1024C1-10CI-2.7?

The AT25P1024C1-10CI-2.7 uses a 20-lead JEDEC SOIC package (20S2), 0.300" wide, with gull-wing leads. This is confirmed in the Ordering Information table where "-10CI" denotes the 20-lead SOIC variant, and the mechanical drawing on page 15 specifies dimensions compliant with MS-013 variation AC.

Can the AT25P1024C1-10CI-2.7 be used in SPI Mode 3 (1,1)?

Yes, the AT25P1024C1-10CI-2.7 explicitly supports SPI Modes 0 (0,0) and 3 (1,1), as stated in the Features section. In Mode 3, sampling occurs on the falling edge of SCK with data stable on the rising edge, and the device correctly interprets op-codes and addresses under this polarity/phase configuration.