23LC1024T 1Mbit SPI SRAM — For Teensy Audio Adapter Board Memory Expansion

23LC1024T 1Mbit SPI SRAM — Teensy Audio Adapter Board Memory Expansion

The Microchip 23LC1024T is a 1Mbit (128KB) SPI SRAM designed to expand the working memory on the Teensy Audio Adapter Board. The Audio Adapter has a dedicated footprint for this chip, enabling longer audio delay buffers for reverb, delay, echo, and chorus effects in Teensy Audio Library projects. Unlike Flash memory, SRAM provides unlimited read/write cycles with no wear — ideal for real-time audio buffer applications.

Key Specifications

Parameter	Value
Capacity	1Mbit (128KB × 8)
Technology	SRAM (volatile)
Interface	SPI (Mode 0,0 and 0,3)
Max Clock	20MHz
Supply Voltage	2.5V – 3.6V (3.3V typical)
Write Endurance	Unlimited (SRAM)
Package	SOP-8 (surface mount)
Manufacturer	Microchip Technology

Teensy Audio Adapter Installation

• The Teensy Audio Adapter Board has a dedicated SOP-8 footprint for this chip
• Install before assembling the adapter to the Teensy board for easier soldering access
• Required for AudioEffectDelay and AudioEffectReverb with longer delay times in the Teensy Audio Library
• Without this chip, delay effects are limited to the MCU’s internal SRAM

SRAM vs Flash — Why SRAM for Audio Buffers?

• Unlimited write cycles — audio buffers are written thousands of times per second; Flash would wear out quickly
• Fast random access — SRAM allows byte-level read/write at full SPI speed without erase cycles
• Volatile — data is lost on power-off, which is fine for real-time audio buffers

Typical Applications

• Teensy Audio Adapter reverb and delay effect buffer expansion
• Real-time audio echo and chorus effect memory
• SPI SRAM for any 3.3V microcontroller project requiring fast external RAM
• Data buffering in high-speed data acquisition systems

Package Contents

• 1× Microchip 23LC1024T SPI SRAM IC (SOP-8)

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