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 include:
• 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
• Simplicity
• Faster – quick and easy to control
• Used as cache memory
• Large size
• Price – expensive as it uses more chips than DRAM for the same amount of storage space
• High power Consumption
• Reliability
Disadvantages include:
• Capacity
• Varying power consumption
Can be found in the following:
• Computers
• Workstations
• Routers
• LCD screens and printers
• Electronics
• Microprocessor

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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. 188-5323
Mfr. Part No.CY62148ELL-45ZSXI
€5.181
Each (In a Tray of 117)
units
4Mbit 512k x 8 bit 512k 8bit 45ns - 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 124-2940
Mfr. Part No.CY62148ELL-45ZSXI
€6.16
Each
units
4Mbit 512k x 8 bit 512k 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 182-3336
Mfr. Part No.CY7C1021DV33-10BVXI
€2.24
Each (In a Pack of 3)
units
- - - - - - - - - - - - - -
RS Stock No. 171-0991
Mfr. Part No.CY7C1021CV33-12ZSXE
€2.731
Each (In a Tray of 270)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 171-0993
Mfr. Part No.CY7C1059DV33-10ZSXI
€8.079
Each (In a Tray of 135)
units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 181-8389
Mfr. Part No.CY14E256LA-SZ25XI
€17.30
Each
units
256kbit 32k x 8 bit 32k 8bit 25ns - - Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm
RS Stock No. 125-7538
Mfr. Part No.CY7C1350G-133AXC
€6.37
Each
units
4Mbit 128k x 36 bit 128k 36bit - - - Yes - Surface Mount TQFP 100 14.1 x 20.1 x 1.45mm 1.45mm
RS Stock No. 181-7616
Mfr. Part No.CY7C1041G-10ZSXI
€5.585
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 124-2943
Mfr. Part No.CY62157EV30LL-45BVXI
€8.61
Each
units
8Mbit 1M x 8 bit, 512k x 16 bit 512k 8 bit, 16bit 45ns 8 bit, 16 bit 1MHz Yes - Surface Mount VFBGA 48 6 x 8 x 0.79mm 0.79mm
RS Stock No. 125-7529
Mfr. Part No.CY7C1019DV33-10VXI
€3.635
Each (In a Pack of 2)
units
1Mbit 128k x 8 bit 128k 8bit 10ns 8bit - Yes - Surface Mount SOJ 32 21.08 x 10.29 x 3.124mm 3.124mm
RS Stock No. 198-7999
Mfr. Part No.CY62148EV30LL-45ZSXIT
€3.80
Each (In a Pack of 2)
units
4096kbit 512k x 8 bit 512k 8bit 45ns - - - - - - - - -
RS Stock No. 198-8007
Mfr. Part No.CY7C1049GN30-10VXIT
€3.112
Each (On a Reel of 500)
units
4096kbit 512k x 8 bit 512k 16bit 10ns - - - - - - - - -
RS Stock No. 198-7994
Mfr. Part No.CY62128EV30LL-45ZAXIT
€1.14
Each (On a Reel of 1500)
units
1024kbit 128k x 8 bit 128k 8bit 45ns - - - - - - - - -
RS Stock No. 125-6975
Mfr. Part No.CY62137EV30LL-45ZSXI
€1.725
Each (In a Pack of 2)
units
2Mbit 128k x 16 bit 128k 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 171-0975
Mfr. Part No.CY62148EV30LL-45BVXI
€4.257
Each (In a Tray of 480)
units
4Mbit 512k x 8 bit 512k 8bit 45ns 8bit - Yes - Surface Mount VFBGA 36 6 x 8 x 0.84mm 0.84mm
RS Stock No. 194-8914
Mfr. Part No.CY7C1021DV33-10VXI
€2.298
Each (In a Pack of 5)
units
1Mbit 64k x 16 bit 64k 16bit 10ns 16bit 1MHz - Asynchronous Surface Mount SOJ 44 1.13 x 0.405 x 0.12in 3.05mm
RS Stock No. 181-7445
Mfr. Part No.CY7C1021DV33-10ZSXIT
€1.458
Each (On a Reel of 1000)
units
1Mbit 64k x 16 bit 64k 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 194-8912
Mfr. Part No.CY7C1021D-10VXI
€2.91
Each (In a Pack of 5)
units
1Mbit 64k x 16 bit 64k 16bit 10ns 16bit 1MHz - Asynchronous Surface Mount SOJ 44 1.13 x 0.405 x 0.12in 3.05mm
RS Stock No. 193-8460
Mfr. Part No.CY7C1018DV33-10VXIT
€1.534
Each (On a Reel of 1000)
units
1Mbit 128k x 8 bit 128k 8bit 10ns 8bit 1MHz - Asynchronous Through Hole SOJ 32 0.810 x 0.292 x 0.103in 2.62mm
RS Stock No. 181-7443
Mfr. Part No.CY62148EV30LL-45ZSXI
€3.147
Each (In a Tray of 117)
units
4Mbit 512k x 8 bit 512k 8bit 45ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm