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. 761-7065
Mfr. Part No.R1LP0408CSP-7LC#B0
$12.16
Each
units
4Mbit 512K x 8 bit 512K 8bit 70ns - - Yes Asynchronous Surface Mount SOP 32 - -
RS Stock No. 177-5513
Mfr. Part No.AS6C6264-55PCN
$3.65
Each (In a Tube of 15)
units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 538-158
Mfr. Part No.AS6C6264-55PCN
$4.265
Each (In a Pack of 2)
units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 538-249
Mfr. Part No.AS7C4098A-12TIN
$9.26
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 177-5532
Mfr. Part No.AS7C4098A-12TIN
$7.33
Each (In a Tray of 135)
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 178-4114
Mfr. Part No.23LC512-I/ST
BrandMicrochip
$2.40
Each (In a Tube of 100)
units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 823-4532
Mfr. Part No.23LC512-I/ST
BrandMicrochip
$2.42
Each (In a Pack of 5)
units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 538-176
Mfr. Part No.AS6C1008-55TIN
$3.735
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 177-5533
Mfr. Part No.AS6C1008-55TIN
$2.80
Each (In a Tray of 156)
units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 769-7345
Mfr. Part No.23LC1024-I/P
BrandMicrochip
$3.17
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128Kk 8bit 5ns 24bit 20MHz Yes Synchronous Through Hole PDIP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 912-2714
Mfr. Part No.23LC1024-I/P
BrandMicrochip
$3.18
Each (In a Tube of 60)
units
1Mbit 128K words x 8 bit 128K 8bit 5ns 24bit 20MHz Yes Synchronous Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 912-6710
Mfr. Part No.23LCV1024-I/P
BrandMicrochip
$3.62
Each (In a Tube of 60)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 803-2272
Mfr. Part No.23LCV1024-I/P
BrandMicrochip
$4.222
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 170-0738
Mfr. Part No.AS6C4008-55SIN
$6.69
Each (In a Tube of 22)
units
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 538-160
Mfr. Part No.AS6C4008-55SIN
$7.00
Each
units
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 188-5324
Mfr. Part No.CY62148ELL-55SXI
$7.387
Each (In a Tube of 25)
units
4Mbit 512k x 8 bit 512k 8bit 55ns - 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 124-2941
Mfr. Part No.CY62148ELL-55SXI
$7.48
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 538-148
Mfr. Part No.AS6C62256-55PCN
$4.355
Each (In a Pack of 2)
units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 761-7074
Mfr. Part No.R1LV0408CSA-5SI#B0
$21.02
Each
units
4Mbit 512K x 8 bit 512K 8bit 55ns - - Yes Asynchronous Surface Mount STSOP 32 - -
RS Stock No. 769-7342
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
$3.37
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128Kk 8bit 5ns 24bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
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