Microchip Technology 23LC512-I/P

Overview

23LC512-I/P from Microchip Technology is a 512-Kbit serial SRAM with SPI/SDI/SQI interface, operating at up to 20 MHz clock rate over 2.5V–5.5V supply. It delivers 3 mA read current at 5.5V/20 MHz, 4 µA standby current at +85°C, and supports byte/page/sequential access modes in an 8-lead PDIP package for embedded microcontroller memory expansion.

For engineers reviewing the 23LC512-I/P datasheet, 23LC512-I/P pinout, 23LC512-I/P application, or 23LC512-I/P equivalent, key selection considerations include VCC range (2.5–5.5V), industrial temperature rating (–40°C to +85°C), PDIP package compatibility, SPI/SDI/SQI mode flexibility, and zero write time with unlimited endurance.

Technical Context

The 23LC512-I/P implements a serial peripheral interface with separate SI/SO lines and optional SDI (dual I/O) or SQI (quad I/O) modes enabled via EDIO/EQIO commands. Its internal 64K × 8-bit memory array supports three configurable access modes-byte, page (32-byte), and sequential-controlled by a writable MODE register.

It features hardware HOLD functionality (active-low, synchronous with SCK) for pausing ongoing transfers without sequence reset, and operates in low-power Standby mode when CS is high. The device powers on with MODE bits set to 01 (default Sequential mode) and requires no external refresh or initialization.

Key Specifications

Pinout & Package

8-Lead Plastic Dual In-Line Package (PDIP), 300-mil body width, through-hole mountable. Pin 1 marked with notch or dot; lead finish is matte tin (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LC512-I/P, the 23LC1024-I/P offers double memory without layout change, while FM25V05-G trades voltage flexibility for inherent non-volatility and lower active current - making each optimal for distinct power, retention, and capacity constraints.

Availability

23LC512-I/P is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and automotive body electronics requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole assembly.

Supply support for 23LC512-I/P 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 Inc. 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 23LC512-I/P belongs to Microchip's serial SRAM product line, designed specifically to replace parallel SRAM and extend microcontroller memory in space-constrained, cost-sensitive embedded systems using standard SPI infrastructure.

FAQ

What is the maximum clock frequency supported by the 23LC512-I/P in industrial temperature range?

The 23LC512-I/P supports a maximum clock frequency of 20 MHz across its full industrial temperature range (–40°C to +85°C), as specified in Table 1-2 AC Characteristics. This applies to all interface modes (SPI, SDI, SQI) and is validated under worst-case VCC (2.5V and 5.5V) conditions per Microchip DS20005155C.

Does the 23LC512-I/P require external pull-up resistors on its SPI interface pins?

No, the 23LC512-I/P does not require external pull-ups on SI, SO, or SCK. Its inputs meet standard SPI voltage thresholds (VIH ≥ 0.7×VCC, VIL ≤ 0.2×VCC), and SO is actively driven. Pull-ups may be used on CS or HOLD only if open-drain host drivers are employed - not required for typical push-pull MCU GPIOs.

Can the 23LC512-I/P retain data when VCC drops below nominal operating voltage?

Yes - the 23LC512-I/P guarantees data retention down to VCC = 1.0V (per D011 in Table 1-1), provided temperature remains within specification. This allows safe operation during brown-out conditions or battery sag, preserving RAM contents until backup power or reset occurs.

Is the HOLD function available when using SQI mode on the 23LC512-I/P?

No, the HOLD function is explicitly disabled in SQI mode, as confirmed in Section 3.5 and Section 4.2 of the datasheet. When operating in SQI, the HOLD/SIO3 pin is repurposed as a dedicated quad-data line, and suspend/resume capability must be managed at the host software level instead.

What package type does the suffix '-I/P' indicate for the 23LC512-I/P?

The '-I/P' suffix denotes Industrial temperature grade (–40°C to +85°C) and 8-lead Plastic Dual In-Line Package (PDIP), as defined in Microchip's packaging nomenclature (DS20005155C, page 19). It is a through-hole, RoHS-compliant package with 300-mil body width and matte tin leads.