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. Its 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 computers 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 ReliabilityDisadvantages include: Capacity Varying power consumptionCan 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. 124-2937
Mfr. Part No.CY62128EV30LL-45ZAXI
TWD69.40
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 188-5320
Mfr. Part No.CY62128EV30LL-45ZAXI
TWD65.10
Each (In a Tray of 234)
units
1Mbit 128k x 8 bit 128k 8bit 45ns - 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 171-0987
Mfr. Part No.CY7C1019D-10ZSXI
TWD138.30
Each (In a Tray of 468)
units
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 827-2571
Mfr. Part No.CY7C1019D-10ZSXI
TWD173.80
Each (In a Pack of 5)
units
1Mbit 128k x 8 128K 8bit 10ns 17bit 100MHz Yes Asynchronous Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 125-7528
Mfr. Part No.CY7C1019D-10ZSXI
TWD174.00
Each (In a Pack of 2)
units
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 181-7449
Mfr. Part No.CY7C1049G-10VXI
TWD208.80
Each (In a Tube of 19)
units
4Mbit 512K x 8 bit 512K 8bit 10ns - - - Asynchronous Surface Mount SOJ 36 0.93 x 0.405 x 0.12in 3.05mm
RS Stock No. 188-5317
Mfr. Part No.CY62128ELL-45SXI
TWD94.30
Each (In a Tube of 25)
units
1Mbit 128k x 8 bit 128k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 182-3377
Mfr. Part No.CY7C1041GN30-10BVXI
TWD171.00
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 125-7529
Mfr. Part No.CY7C1019DV33-10VXI
TWD149.50
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. 188-5318
Mfr. Part No.CY62128EV30LL-45SXA
TWD148.40
Each (In a Tube of 25)
units
1Mbit 128k x 8 bit 128k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 124-2940
Mfr. Part No.CY62148ELL-45ZSXI
TWD252.00
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
New
RS Stock No. 193-8471
Mfr. Part No.CY7C199D-10VXIT
TWD59.50
Each (On a Reel of 1000)
units
256kbit 32 k x 8 bit 32 k 8bit 10ns 8bit 1MHz - Asynchronous Through Hole SOJ 85 11.9 x 8.1 x 1mm 1mm
RS Stock No. 181-7442
Mfr. Part No.CY62148ELL-55SXIT
TWD131.70
Each (On a Reel of 1000)
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 188-5338
Mfr. Part No.CY7C107D-10VXI
TWD1,058.70
Each (In a Tube of 26)
units
1Mbit 128k x 8 bit 128k 8bit 10ns - 100MHz - Asynchronous Surface Mount SOJ 28 0.73 x 0.405 x 0.11mm 0.11mm
RS Stock No. 188-5336
Mfr. Part No.CY7C1021DV33-10ZSXI
TWD82.60
Each (In a Tray of 135)
units
1Mbit 128k x 8 bit 128k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 171-0972
Mfr. Part No.CY62138EV30LL-45BVXI
TWD118.00
Each (In a Tray of 480)
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. 125-6974
Mfr. Part No.CY62128EV30LL-45SXI
TWD123.00
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. 181-7450
Mfr. Part No.CY7C1049GN30-10ZSXI
TWD145.60
Each (In a Tray of 135)
units
4Mbit 512K x 8 bit 512K 8bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 188-5303
Mfr. Part No.CY14E256LA-SZ45XI
TWD631.00
Each (In a Tube of 22)
units
256kbit 32k x 8 bit 32k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm
RS Stock No. 181-7613
Mfr. Part No.CY7C1061GE30-10ZSXI
TWD1,193.00
Each
units
16Mbit 1M x 16 bit 1M 16bit 10ns - - - Asynchronous Surface Mount TSOP 54 22.51 x 10.26 x 1.05mm 1.05mm