8MB/64M-bit PSRAM For Teensy 4.1
$2.95
QSPI PSRAM adds 8 or 16MB of additional volatile memory to Teensy 4.1
26 in stock
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
Support for the 8MB PSRAM chip is included in the Teensyduino and will be automatically detected if installed.
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 AP 6404L-3SQR , but your order may be filled with any of these parts.
- IPUS IPS6404LSQ
- ESP PSRAM64H
- AP 6404L-3SQR
You can find a little more info on adding the memory chips here on the PJRC site.
8MB vs 16MB PSRAM Chips
The obvious difference is that the 16MB PSRAM chips have twice the memory capacity, but they also cost more than the 8MB parts for the same amount of memory.
If you are wanting to push the performance of the PSRAM by increasing the QSPI bus speed from the default 105.6MHz (as of Teensyduino 1.60 Beta 5), the 8MB parts can be pushed harder and will run at up to 166MHz in our testing. The 16MB parts on the other hand can only handle about 120MHz when 2 of the chips are installed. The 16MB parts use two 8MB dies internally, so they load the QSPI bus more than the 8MB parts which may account for the speed difference.
If a Flash chip is installed instead of a 2nd PSRAM, the 8MB PSRAM parts are limited to 132MHz due to the slower Flash installed on the same bus. The 16MB will still operate at 120MHz when coupled with a Flash chip.
If you don’t need more than 16MB PSRAM and no Flash, we recommend using 2 of the 8MB parts. They are less expensive and can potentially operate faster.
You can find more info about using memory in the Teensy 4.1 in our Learn Teensy section.
Preassembled Teensy 4.1 Fully Loaded
If additional memory on the Teensy 4.1 sounds great but the soldering of SMD chips sounds less great, we have the Teensy 4.1 Fully Loaded. The pins and Ethernet header installed with the option for this 8MB or a 16MB PSRAM chip and either a 2nd 8 or 16MB PSRAM chip for 16MB or 32MB total. In addition a 16MB Flash, 128MB NAND Flash or 256MB NAND Flash chip can be put in the 2nd location. Click on the pic for more detailed information.
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Preassembled Teensy 4.1 Fully Loaded for Prototyping System
If you are looking for Teensy 4.1 that are configured to work with our Prototyping System or Project System for Teensy 4.1 or another baseboard where the Teensy 4.1 is socketed with bottom mounted I/O, this is the version that you want. They bring the VUSB, Ethernet, USB Host and Program/VBat headers down from the bottom of the Teensy as well as having the VUSB trace cut and diode added to isolate USB and VIN power. Please note that these will not plug into a solderless breadboard due to the additional headers on the bottom of the module and are designed for mounting on a PCB.
They are available in the same memory configurations as above. Click on the pic for more info on this version.
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These products are also available in low-profile variations for height limited applications.
FURTHER READING:
LEARN – Working with Teensy 4.1 Memory – Overview of the Teensy 4.1 memory architecture including the optional PSRAM and Flash memories.
Notes:
- 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
| Operational Ratings | ||
| Vcc | 3.3V | |
| Clock Rate | Maximum | 133MHz |
| Package Type | Plastic body, SOP-8 | |
| Mfr | APMemory, ESP or IPUS | |
| Datasheets | APMemory | APS6404L-3SQR |
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Select options This product has multiple variants. The options may be chosen on the product pageTeensy 4.1
Price range: $30.95 through $35.95600MHz Arduino compatible microcontroller
Select Pins Loose or Soldered with Ethernet or NE (No Ethernet) or Lockable
