Microchip Technology 23LC512T-I/SN

Overview

23LC512T-I/SN from Microchip Technology is a 512-Kbit serial SRAM with SPI/SDI/SQI interface, 2.5V–5.5V supply, 20 MHz max clock (16 MHz at extended temp), 3 mA read current at 5.5V/20 MHz, and 4 µA standby current at +85°C. It supports byte/page/sequential access modes and is used in microcontroller-based embedded systems requiring fast, low-power, non-volatile-adjacent memory buffering.

For engineers reviewing the 23LC512T-I/SN datasheet, 23LC512T-I/SN pinout, 23LC512T-I/SN application, or 23LC512T-I/SN equivalent, key selection considerations include VCC range compatibility (2.5–5.5 V), industrial temperature operation (−40°C to +85°C), SOIC-8 packaging, SDI/SQI mode enablement via EDIO/EQIO commands, and HOLD functionality availability only in SPI/SDI modes.

Technical Context

The 23LC512T-I/SN implements a synchronous serial interface with three configurable data transfer modes: standard SPI (single I/O), Serial Dual Interface (SDI), and Serial Quad Interface (SQI). Its MODE register (bits 7–6) selects byte, page, or sequential operation - enabling flexible memory access granularity without external address latching.

It uses an 8-bit instruction register with MSB-first protocol, supports zero write time and unlimited read/write cycles, and enters low-power Standby mode on CS high. HOLD functionality suspends ongoing transfers without resetting the sequence, but is disabled in SQI mode due to SIO3 pin reassignment.

Key Specifications

Pinout & Package

23LC512T-I/SN is packaged in an 8-lead narrow SOIC (SN) with 1.27 mm pitch, 3.90 mm body width, and RoHS-compliant matte tin finish. Pin 1 is marked with a beveled corner or dot; package conforms to JEDEC MS-012AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LC1024T-I/SN, the 23LC512T-I/SN offers lower cost and smaller footprint for mid-size buffers; compared with FM25V20A-G, it provides wider voltage compatibility and higher max clock rate but lacks F-RAM's instant-write and ultra-low write energy advantages.

Availability

23LC512T-I/SN is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical wearable design requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 23LC512T-I/SN 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 leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated silicon and development tools.

The 23LC512T-I/SN belongs to Microchip's serial SRAM product line, designed specifically for embedded systems needing SPI-compatible, low-power, high-reliability volatile memory with flexible interface modes and industrial temperature resilience.

FAQ

What is the operating temperature range for the 23LC512T-I/SN?

The 23LC512T-I/SN is rated for industrial temperature operation from −40°C to +85°C. This is confirmed by the "I" suffix in the part number and explicitly stated in the Device Selection Table. The "T" denotes tape-and-reel packaging, and "/SN" specifies the 8-lead narrow SOIC package. Extended temperature (−40°C to +125°C) is supported by the 23LC512-E variant, not the 23LC512T-I/SN.

Does the 23LC512T-I/SN support Quad SPI (QSPI) mode?

Yes, the 23LC512T-I/SN supports Serial Quad Interface (SQI) mode using the SIO0–SIO3 pins. Entry is performed via the EQIO command (0x38); however, HOLD functionality is disabled in SQI mode because the HOLD/SIO3 pin is reassigned as a data line. SQI enables four-bit-per-clock transfers, doubling bandwidth over SDI and quadrupling over standard SPI.

What is the maximum clock frequency for the 23LC512T-I/SN at +85°C?

The maximum clock frequency for the 23LC512T-I/SN at +85°C is 20 MHz. This is specified in the Device Selection Table under "Max. Clock Frequency" for the 23LC512 row and confirmed in Table 1-2 (AC CHARACTERISTICS) where FCLK Min = -, Max = 20 MHz for Industrial temperature. At extended temperature (−40°C to +125°C), the limit drops to 16 MHz.

How does the HOLD function operate on the 23LC512T-I/SN?

The HOLD function on the 23LC512T-I/SN pauses an active SPI or SDI transaction without resetting the internal address pointer or command state. It must be asserted while SCK is low; SO immediately tri-states, and communication resumes on the next SCK high-to-low transition after HOLD is deasserted. HOLD is unavailable in SQI mode, as documented in Section 3.5 and Figure 3-3 of the datasheet.

What memory organization does the 23LC512T-I/SN use?

The 23LC512T-I/SN uses a 64K × 8-bit organization totaling 512 Kbit, arranged in 2048 pages of 32 bytes each. This structure supports byte, page, and sequential access modes. The default power-on mode is Sequential (MODE bits 7–6 = 01), allowing continuous read/write across address boundaries with automatic rollover from 0xFFFF to 0x0000.