Espressif Systems released the ESP-PSRAM32, which is a 1,8 V, 32 Mbit SPI/QPI (serial/quad parallel interface) pseudo SRAM (static random access memory) device.
The chip is configurable as 1-bit input and output separately, or 4-bit I/O common interface, and all of the necessary refresh operations are taken care by the device itself.
The SPI/QPI includes an on-chip voltage sensor used to start the self-initialisation process. When VDD reaches a stable level above the minimum voltage, the device will need 150 μs to complete its self-initialisation process.
After the 150 μs period, the device requires at least one clock to properly reset, after which it will be ready for normal operation.
The RoHS compliant chip is supplied in an SOP8-150 mil package specified for operation across a -25°C to +85°C temperature range.
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