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. 126-6968
Mfr. Part No.R1LV1616HBG-4SI#B0
MYR313.81
Each
units
16Mbit 1M x 16 bit 1M 16bit 45ns 20bit - Yes - Surface Mount FBGA 48 8 x 9.5 x 0.9mm 0.9mm
RS Stock No. 181-8389
Mfr. Part No.CY14E256LA-SZ25XI
MYR85.28
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. 923-7756
Mfr. Part No.DS1245AB-100+
MYR112.39
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. 170-2048
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. 125-6933
Mfr. Part No.CY14B101LA-ZS25XI
MYR84.58
Each
units
1Mbit 128K x 8 bit, 64K x 16 bit 128 k, 64k 8 bit, 16bit 25ns 8 bit, 16 bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 170-2179
Mfr. Part No.IS61C6416AL-12TLI
BrandISSI
MYR10.101
Each (In a Tray of 135)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 123-8837
Mfr. Part No.N01S830HAT22I
MYR20.00
Each (In a Pack of 2)
units
1Mbit 128k x 8 bit 128k 8bit 5ns 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 4.4 x 3 x 0.9mm 0.9mm
RS Stock No. 170-0747
Mfr. Part No.AS7C1024C-12JIN
MYR14.914
Each (In a Tube of 23)
units
1Mbit 128k x 8 bit 128k 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 10.29 x 2.92mm 2.92mm
RS Stock No. 181-7447
Mfr. Part No.CY7C1041G30-10ZSXI
MYR31.49
Each (In a Tray of 135)
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. 799-2717
Mfr. Part No.DS1230Y-70IND+
MYR96.61
Each
units
256kbit 32k x 8 bit 32k 8bit 70ns 15bit - Yes - Through Hole EDIP 28 39.37 x 18.8 x 10.67mm 10.67mm
RS Stock No. 181-7441
Mfr. Part No.CY62147EV30LL-45ZSXI
MYR11.82
Each (In a Tray of 135)
units
4Mbit 256k x 16 bit 256k 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 811-5181
Mfr. Part No.IS61WV25616BLL-10TLI
BrandISSI
MYR25.235
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 189-9239
Mfr. Part No.DS1245Y-70IND+
MYR126.36
Each
units
1Mbit 128k x 8 bit 128k 8bit 70ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 200-9838
Mfr. Part No.48L640-I/SN
BrandMicrochip
MYR3.993
Each (In a Pack of 10)
units
64kbit 8k x 8 bit 8k 8bit 10ns - - - - - - - - -
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
RS Stock No. 198-7993
Mfr. Part No.CY62128EV30LL-45SXIT
MYR17.484
Each (In a Pack of 5)
units
1024kbit 128k x 8 bit 128k 8bit 45ns - - - - - - - - -
RS Stock No. 198-7995
Mfr. Part No.CY62128EV30LL-45ZAXIT
MYR7.072
Each (In a Pack of 5)
units
1024kbit 128k x 8 bit 128k 8bit 45ns - - - - - - - - -
RS Stock No. 538-164
Mfr. Part No.AS6C4008-55TIN
MYR17.87
Each
units
4Mbit 512K words x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 125-7519
Mfr. Part No.CY62187EV30LL-55BAXI
MYR319.06
Each
units
64Mbit 4M x 16 bit 4M 16bit 55ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 1.2mm 1.2mm
RS Stock No. 798-5208
Mfr. Part No.23LC512-I/SN
BrandMicrochip
MYR5.948
Each (In a Pack of 5)
units
512kbit 64K x 8 bit 64k 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm