The ESP-PSRAM64 and ESP-PSRAM64H, introduced by Espressif Systems, are 64 Mbit serial pseudo SRAM devices designed for high-speed, low-voltage applications in the electronics industry. These components are organized in an 8Mx8 bit configuration and utilize high-performance CMOS technology for reliability and efficiency. The ESP-PSRAM64 operates at a voltage of 1.8V and supports a maximum clock rate of 144 MHz, while the ESP-PSRAM64H is designed for 3.3V operations with a maximum clock rate of 133 MHz. Both variants offer flexible access through Serial Peripheral Interface (SPI) and Quad Peripheral Interface (QPI) modes, catering to applications requiring fast data rates. They are packaged in SOP8-150 mil, ensuring compatibility with standard PCB layouts. Key features include burst operations with a lower max input clock frequency of 84 MHz when crossing page boundaries, unlimited reads and writes to the memory array, and a self-initialization process upon power-up. These PSRAM devices are ideal for applications in embedded systems where high bandwidth and low power consumption are critical.