SRAM

SRAM stands for Static Random Access Memory and is a type of semiconductor memory that uses bistable latching circuitry (flip-flop) to store each bit. It holds data bits in its memory so long as power is being supplied. It cannot hold data if power is removed. SRAM is used where speed or low power are needed. It’s higher density than DRAM, and less complicated structure makes it ideal to use in semiconductor memory scenarios where high capacity memory is used as seen in the working memory within computers.

SRAM is different to DRAM (dynamic RAM, which stores bits in cells consisting of a capacitor and a transistor), due to the fact that SRAM does not have to be refreshed unlike Dynamic which will lose data unless refreshed periodically. Also SRAM is faster and more expensive than DRAM.

SRAM is used for a computer’s cache memory as well as being part of the RAM digital to analogue converter found on a video card. SRAM can be designed with a general CMOS technology process with six transistors (6T memory cell) and no capacitors. Since transistors do not require power to prevent leakage, SRAM does not have to be refreshed on a regular basis:

Features

  • Data is held statically – data is held in the semiconductor memory, no need to refresh data after every read data operation as long as the power is applied to the memory
  • Three operational states which are hold, write and read
  • Bistable (cross-coupled) INVs for storage
  • Access transistors MAL and MAR – access to stored data for read and write
  • Word line, WL, controls access – WL=0 (hold operation), WL=1 (read/write operation)
  • Long data lifetime

Applications

  • Computers
  • Workstations
  • Routers
  • LCD screens and printers
  • Electronics
  • Microprocessors

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Description Price Memory Size Organisation Number of Words Number of Bits per Word Maximum Random Access Time Address Bus Width Clock Frequency Low Power Timing Type Mounting Type Package Type Pin Count Dimensions Height
RS Stock No. 171-0970
Mfr. Part No.CY62137FV30LL-45BVXI
MYR10.922
Each (In a Tray of 480)
units
2Mbit 128k x 16 bit 128k 16bit 45ns 16bit - Yes - Surface Mount VFBGA 48 6 x 8 x 0.81mm 0.81mm
RS Stock No. 151-1491
Mfr. Part No.47L16-I/P
BrandMicrochip
MYR4.14
Each (In a Pack of 10)
units
- - - - - - - - - - - - - -
New
RS Stock No. 194-8861
Mfr. Part No.CY62136FV30LL-45ZSXI
MYR14.755
Each (In a Tray of 135)
units
- - - - - - - - - - - - - -
RS Stock No. 170-2048
Mfr. Part No.IS62C256AL-45TLI
BrandISSI
MYR6.283
Each (In a Tray of 234)
units
256kbit 32k x 8 bit 32k 8bit 45ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8.1 x 11.9 x 1mm 1mm
RS Stock No. 170-2177
Mfr. Part No.IS61C6416AL-12KLI
BrandISSI
MYR10.531
Each (In a Tray of 16)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - - - Surface Mount SOJ 44 28.7 x 10.29 x 3.11mm 3.11mm
New
RS Stock No. 217-3664
Mfr. Part No.70V28L15PFG
MYR376.145
Each (In a Tray of 6)
units
1024kbit 64K x 16 64K 16bit 15ns - - - - - - - - -
New
RS Stock No. 194-8921
Mfr. Part No.CY7C1061G30-10BVJXI
MYR110.206
Each (In a Tray of 480)
units
- - - - - - - - - - - - - -
RS Stock No. 811-5208
Mfr. Part No.IS62WV1288BLL-55TLI
BrandISSI
MYR10.783
Each (In a Pack of 3)
units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes - Surface Mount TSOP 32 18.5 x 8.1 x 0.95mm 0.95mm
RS Stock No. 125-6974
Mfr. Part No.CY62128EV30LL-45SXI
MYR13.87
Each (In a Pack of 2)
units
1Mbit 128K x 8 bit 128k 8bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.751 x 11.43 x 2.895mm 2.895mm
RS Stock No. 125-7517
Mfr. Part No.CY62167EV30LL-45ZXI
MYR72.81
Each
units
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
New
RS Stock No. 217-3684
Mfr. Part No.71V416L15PHGI
MYR17.99
Each (In a Tube of 26)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
New
RS Stock No. 217-3692
Mfr. Part No.71V416S15PHG
MYR16.587
Each (In a Tube of 26)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
New
RS Stock No. 217-7882
Mfr. Part No.71256SA12TPG
MYR12.908
Each (In a Tube of 28)
units
256kbit 32K x 8 32K 8bit 12ns - - - - - - - - -
New
RS Stock No. 217-3685
Mfr. Part No.71V416L15PHGI
MYR20.59
Each (In a Pack of 2)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
RS Stock No. 192-1225
Mfr. Part No.DS1245AB-120+
MYR151.756
Each (In a Tube of 11)
units
1024kbit 128k x 8 bit 128k 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
RS Stock No. 170-2057
Mfr. Part No.IS62C1024AL-35TLI
BrandISSI
MYR10.233
Each (In a Tray of 156)
units
1Mbit 128k x 8 bit 128k 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS Stock No. 125-6978
Mfr. Part No.CY62138EV30LL-45BVXI
MYR17.70
Each (In a Pack of 2)
units
2Mbit 256K x 8 bit 256k 8bit 45ns 8bit - Yes - Surface Mount VFBGA 36 6 x 8 x 0.81mm 0.81mm
RS Stock No. 714-4738
Mfr. Part No.IDT70V24L20PFGI
BrandIDT
MYR131.40
Each
units
64kbit 4K x 16 bit 4k 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 193-8457
Mfr. Part No.CY621472E30LL-45ZSXI
MYR25.94
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS Stock No. 193-8472
Mfr. Part No.CY7C199D-10VXIT
MYR10.90
Each (In a Pack of 5)
units
256kbit 32k x 8 bit 32k 8bit 10ns 8bit 1MHz - Asynchronous Through Hole SOJ 85 11.9 x 8.1 x 1mm 1mm