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1. Introduction

1.

Introduction

ESP-PSRAM64 and ESP-PSRAM64H are 64 Mbit serial pseudo SRAM devices that are organized

in 8Mx8 bits. They are fabricated using the high-performance and high-reliability CMOS technology.

ESP-PSRAM64 operates at 1.8V and can offer high data bandwidth at 144 MHz clock rate, while

ESP-PSRAM64H operates at 3.3V and can support up to 133 MHz clock rate. Note, however, that

burst operations which cross page boundaries have a lower max input clock frequency at 84 MHz.

Both of the PSRAM devices can be accessed via the Serial Peripheral Interface (SPI). Additionally, a

Quad Peripheral Interface (QPI) is supported if the application needs faster data rates. The devices

also support unlimited reads and writes to the memory array.

Note that the information in this data sheet is applicable to both PSRAM devices. Any differences

between them will be clearly specified in the course of this document.

Table 1-1. Ordering Information of ESP-PSRAM64 and ESP-PSRAM64H

Part number

Product

density

Package

type

Maximum

Clock rate

Operating

temperature

Product

carrier

Green code

Operating

voltage

Read/Write

operation mode

SPI mode

ESP-PSRAM64

64 Mbit

SOP8-150 mil

144 MHz

–40℃ ~

85℃

Tape &

Reel

RoHS Compliant

Package and

Green/Reach

Package

1.8V

1 KB Pages

Standard/

Quad SPI

ESP-PSRAM64H

133 MHz

3.3V

Espressif Systems

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2018.06

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