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. 889-5538
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
PHP102.741
Each (In a Tube of 100)
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
RS Stock No. 769-7342
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
PHP110.44
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
RS Stock No. 912-6849
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
PHP111.281
Each (In a Tube of 100)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 666-8138
Mfr. Part No.23A256-I/SN
BrandMicrochip
PHP81.964
Each (In a Pack of 5)
units
256kbit 32768 words x 8 bit 32K 8bit 32ns 16bit 16MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 798-5208
Mfr. Part No.23LC512-I/SN
BrandMicrochip
PHP79.25
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
RS Stock No. 769-7349
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
PHP112.49
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128Kk 8bit - 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 178-4114
Mfr. Part No.23LC512-I/ST
BrandMicrochip
PHP156.519
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. 178-4043
Mfr. Part No.23LC512-I/SN
BrandMicrochip
PHP152.172
Each (In a Tube of 100)
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
RS Stock No. 823-4532
Mfr. Part No.23LC512-I/ST
BrandMicrochip
PHP81.30
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. 178-4035
Mfr. Part No.23K256-I/ST
BrandMicrochip
PHP121.734
Each (In a Tube of 100)
units
256kbit 32K x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3 x 4.4 x 1mm 1mm
RS Stock No. 912-2859
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
PHP101.507
Each (In a Tube of 100)
units
1Mbit 128K words x 8 bit 128K 8bit - 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 803-2181
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
PHP126.29
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 715-4356
Mfr. Part No.23K256-I/ST
BrandMicrochip
PHP89.35
Each
units
256kbit 32K x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3 x 4.4 x 1mm 1mm
RS Stock No. 178-4938
Mfr. Part No.23K256-I/P
BrandMicrochip
PHP118.334
Each (In a Tube of 60)
units
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Through Hole PDIP 8 9.27 x 6.35 x 3.3mm 3.3mm
RS Stock No. 146-3215
Mfr. Part No.47L16-I/SN
BrandMicrochip
PHP37.29
Each (In a Tube of 100)
units
16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 146-3217
Mfr. Part No.47L16-I/ST
BrandMicrochip
PHP40.15
Each (In a Tube of 100)
units
16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 178-4109
Mfr. Part No.23K256-E/ST
BrandMicrochip
PHP127.53
Each (In a Tube of 100)
units
256kbit 32768 x 8 bit 32768 8bit 50ns 16bit 20MHz - Synchronous Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm
RS Stock No. 146-3210
Mfr. Part No.47C16-I/ST
BrandMicrochip
PHP37.85
Each (In a Tube of 100)
units
16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 146-3213
Mfr. Part No.47L04-I/ST
BrandMicrochip
PHP34.99
Each (In a Tube of 100)
units
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 912-2714
Mfr. Part No.23LC1024-I/P
BrandMicrochip
PHP100.374
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