8MB (64M-bit) PSRAM — For Teensy 4.1 RAM Expansion

8MB (64M-bit) PSRAM — Teensy 4.1 RAM Expansion

PSRAM (Pseudo-Static RAM) combines the high density of DRAM with the simple SPI interface of SRAM, providing 8MB of fast external working memory for the Teensy 4.1. The Teensy 4.1 PCB includes a dedicated footprint for one of these chips, enabling large array storage, audio buffers, and data-intensive applications that exceed the Teensy’s 1MB internal RAM. Unlike Flash, PSRAM supports unlimited read/write cycles — ideal for real-time data buffering.

Key Specifications

Parameter	Value
Capacity	8MB (64M-bit)
Technology	PSRAM (Pseudo-Static RAM)
Interface	SPI / Quad SPI
Supply Voltage	3.3V
Write Endurance	Unlimited
Package	WSON-8 (bottom-contact)

Teensy 4.1 Installation Notes

• Dedicated WSON-8 footprint on the bottom of the Teensy 4.1 PCB
• Solder before installing header pins for easier access
• Accessible via the EXTMEM memory region in Teensy 4.1 firmware
• Declare large arrays with EXTMEM keyword to place them in PSRAM automatically

Typical Applications

• Large array and buffer storage beyond Teensy 4.1 internal RAM
• Audio sample and waveform buffer for Teensy Audio Library
• Image and framebuffer storage for display projects
• Data-intensive DSP and signal processing applications
• Machine learning inference buffer storage

Package Contents

• 1× 8MB PSRAM IC (WSON-8)

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