8MB/64M-bit PSRAM For Teensy 4.1

QSPI PSRAM adds 64 or 128M-bit additional volatile memory to Teensy 4.1

DESCRIPTION

The Teensy 4.1 board supports 1 or 2 of these 8-pin 8MB PSRAM chips to expand the memory on the module to 8 or 16MB.

PACKAGE INCLUDES:

• ESP PSRAM64H or compatible SMD IC

KEY FEATURES OF 8MB PSRAM:

• 8MB (64 Mbit) memory
• SPI / QPI Interface
• 133MHz clock rate

These ICs provide additional volatile memory for the Teensy 4.1 board.

The smaller footprint supports one of these 8MB PSRAM chips.  In addition a second PSRAM can also be installed on the larger footprint providing a total of 16MB additional memory.  If only one PSRAM is being installed, it must be positioned on the smaller pads.

The larger footprint will also support a Flash memory chip instead.

PSRAM on Teensy 4.1

Use the extRAM_t4 library to work with PSRAM.

Use this Teensy41_psram_memtest to test the memory chip is properly mounted.

The approved compatible PSRAM chips which are interchangeable include the following.  We normally ship ESP PSRAM64H, but your order may be filled with any of these parts.

• IPUS IPS6404LSQ
• ESP PSRAM64H
• AP 6404L-3SQR
• Lyontek LY68L6400S

You can find a little more info on adding the memory chips here on the PJRC site.

Notes:

1.  The ICs come on tape which is normally cut and packaged one IC per ESD bag.  We sometimes also have larger lengths of cut tape available.

TECHNICAL SPECIFICATIONS