64 Mbit Serial Pseudo SRAM - PSRAM - 3.3V 133 MHz

64 Mbit (8 MB) SPI/QSPI pseudo-SRAM in a SOIC-8 package, organized as 8 M x 8 bits, operating at 3.3 V up to 133 MHz. Burst reads/writes that cross page boundaries are limited to 84 MHz max clock.

Logical pinout · physical placement not verified

CE#1
Active-low chip select. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf. CE# selects the PSRAM; CE# high puts the chip in standby.
Type · SPI
SOSIO12
Serial output in SPI mode; bidirectional I/O[1] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Type · Signal
SIO23
Bidirectional I/O[2] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Type · Signal
VSS4
Core supply ground. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Type · GroundVoltage · 0 V
SISIO05
Serial input in SPI mode; bidirectional I/O[0] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Type · Signal
CLK6
Clock input for SPI/QPI access. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Type · Signal
SIO37
Bidirectional I/O[3] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Type · Signal
VCC8
Core supply. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1, Table 2-1 and Table 10-4, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf. Adafruit listing identifies this as the generic 64 Mbit SOIC-8 PSRAM sold for 3.3 V use.
Type · PowerVoltage · ESP-PSRAM64H operating supply 2.7 V to 3.6 V; Adafruit listing: 3.3 V

Pin	Position	Type	Function	Voltage
CE#	1	SPI	Active-low chip select. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf. CE# selects the PSRAM; CE# high puts the chip in standby.
SOSIO1	2	Signal	Serial output in SPI mode; bidirectional I/O[1] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
SIO2	3	Signal	Bidirectional I/O[2] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
VSS	4	Ground	Core supply ground. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.	0 V
SISIO0	5	Signal	Serial input in SPI mode; bidirectional I/O[0] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
CLK	6	Signal	Clock input for SPI/QPI access. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
SIO3	7	Signal	Bidirectional I/O[3] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
VCC	8	Power	Core supply. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1, Table 2-1 and Table 10-4, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf. Adafruit listing identifies this as the generic 64 Mbit SOIC-8 PSRAM sold for 3.3 V use.	ESP-PSRAM64H operating supply 2.7 V to 3.6 V; Adafruit listing: 3.3 V

Logical pinout · physical placement not verified

Pin details

8 connections

CE#
Active-low chip select. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf. CE# selects the PSRAM; CE# high puts the chip in standby.
SPI
1
SOSIO1
Serial output in SPI mode; bidirectional I/O[1] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Signal
2
SIO2
Bidirectional I/O[2] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Signal
3
VSS
Core supply ground. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
GroundVoltage · 0 V
4
SISIO0
Serial input in SPI mode; bidirectional I/O[0] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Signal
5
CLK
Clock input for SPI/QPI access. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Signal
6
SIO3
Bidirectional I/O[3] in QPI mode. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1 and Table 2-1, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf.
Signal
7
VCC
Core supply. Source: ESP-PSRAM64/ESP-PSRAM64H datasheet Figure 2-1, Table 2-1 and Table 10-4, https://cdn-shop.adafruit.com/product-files/4677/4677_esp-psram64_esp-psram64h_datasheet_en.pdf. Adafruit listing identifies this as the generic 64 Mbit SOIC-8 PSRAM sold for 3.3 V use.
PowerVoltage · ESP-PSRAM64H operating supply 2.7 V to 3.6 V; Adafruit listing: 3.3 V
8

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