The ESP-PSRAM64 and ESP-PSRAM64H, introduced by Espressif Systems, are 64 Mbit serial pseudo SRAM devices designed for high-speed, low-power memory applications. These components are organized in an 8Mx8 bit configuration and are fabricated using high-performance, high-reliability CMOS technology. The ESP-PSRAM64 operates at a voltage of 1.8V and supports a maximum clock rate of 144 MHz, while the ESP-PSRAM64H operates at 3.3V with a maximum clock rate of 133 MHz. Both devices feature a Serial Peripheral Interface (SPI) for standard communication, with the addition of Quad Peripheral Interface (QPI) support for applications requiring faster data rates. They are designed to support unlimited reads and writes to the memory array, with burst operations across page boundaries limited to a maximum input clock frequency of 84 MHz. The components come in an SOP8-150 mil package and are specified for operation over a temperature range of -40℃ to 85℃. These PSRAM devices are ideal for applications needing high data bandwidth and storage capacity, such as in embedded systems, IoT devices, and portable electronics, offering engineers flexibility in power management and interface options.