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SRAM Memory | 赛普拉斯半导体

SRAM Memory

Static Random Access Memory (SRAM)

Cypress offers a wide variety of High-speed, Low-power and reliable SRAMs for a broad variety of applications such as Networking, Automotive, Consumer electronics, Industrial, Medical, Aerospace and Defense. With a diversified portfolio of Asynchronous, Synchronous and Dual-port SRAMs and a commitment of stable supply and long term product support, Cypress is the preferred SRAM supplier.


What are SRAMs?

SRAM is a type of random-access memory (RAM) that uses flip-flop based latching circuitry to store each bit. The data bits are retained in memory as long as power is supplied. Unlike Dynamic RAMs (DRAMs), SRAMs does not have to be periodically refreshed. SRAMs come in two different flavors: Synchronous and Asynchronous. Synchronous SRAMs are devices that are synchronized with an external signal called a clock. The device will read and write information into the memory only on particular states of the clock. An asynchronous SRAM, on the other hand, does not depend on the state of a clock. It will begin to read or write information into the memory as soon as it receives the instruction to do so.


Why Cypress’ SRAM?

With On-Chip Hardware ECC (Error correcting Code) , Cypress’ SRAMs perform all ECC related functions in line, without intervention. Higher energy extraterrestrial radiation can flip multiple adjacent bits, leading to multi-bit errors. The single-bit error detection and correction capability of ECC is supplemented by a bit-interleaving scheme to prevent the occurrence of multi-bit errors. Together, these features provide significant improvement in Soft Error Rate (SER) performance, resulting in industry leading FIT rates of less than 0.1 FIT/Mbit.


Cypress’ Asynchronous SRAM memory products are classified into two families based on their access time:

  • Low-power Asynchronous SRAMs: These are devices that typically operate in the 45-ns and slower speed range. These SRAMs are typically designed to consume very low power and are used in applications where power is a major concern. They are often used for temporary data storage and scratch pad applications. Cypress’ MoBL™ Micropower Asynchronous SRAMs belong to this family.
  • Fast Asynchronous SRAMs: These are devices that typically operate in the sub–25 ns region. They are often used in buffer and cache memory applications. Cypress offers Fast SRAMs with PowerSnooze™  to offer devices that combines the access time of Fast Asynchronous SRAM with a unique ultra-low-power sleep mode


Cypress’ Synchronous SRAM memory products are classified based on the data transfer rates :

  • Single Data Rate SRAMs: These are synchronous SRAMs where one word of data is transferred between the SRAMs and the controller in a given clock cycle. These include Cypress’ Pipelined SRAMs, Flowthrough SRAMs, Burst SRAMs and Network  SRAMs – NoBL™/ZBT™ SRAMs
  • Double Data Rate SRAMs: These SRAMs can transfer multiple data words in a given cycle. These SRAMs are designed to be the SRAMs of choice for networking applications with high data rate requirements. QDR (Quad Data Rate™) and DDR (Double Data Rate) SRAMs belong to this family.