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. 714-4801
Mfr. Part No.IDT70V28L20PFGI
BrandIDT
TWD2,946.00
Each
units
1024kbit 64K x 16 bit 64k 16bit 20ns 16bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 170-2073
Mfr. Part No.IDT70V28L20PFGI
BrandIDT
TWD2,945.80
Each (In a Tray of 6)
units
1024kbit 64k x 16 bit 64k 16bit 20ns 16bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 170-2067
Mfr. Part No.IDT70V24L20PFGI
BrandIDT
TWD887.20
Each (In a Tray of 45)
units
64kbit 4k x 16 bit 4k 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 714-4778
Mfr. Part No.IDT7130LA25JGI
BrandIDT
TWD438.00
Each
units
8kbit 1K x 8 bit 1k 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 714-4835
Mfr. Part No.IDT70V25L20PFGI
BrandIDT
TWD1,270.00
Each
units
128kbit 8K x 16 bit 8k 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 170-2069
Mfr. Part No.IDT7130LA25JGI
BrandIDT
TWD405.30
Each (In a Tube of 24)
units
8kbit 1k x 8 bit 1k 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 714-4841
Mfr. Part No.IDT71321LA25JGI
BrandIDT
TWD561.00
Each
units
16kbit 2K x 8 bit 2k 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 170-2075
Mfr. Part No.IDT7132LA35PDG
BrandIDT
TWD420.90
Each (In a Tube of 7)
units
16kbit 2k x 8 bit 2k 8bit 35ns 8bit - Yes Asynchronous Through Hole PDIP 48 61.7 x 15.24 x 3.8mm 3.8mm
RS Stock No. 714-4826
Mfr. Part No.IDT7132LA35PDG
BrandIDT
TWD421.00
Each
units
16kbit 2K x 8 bit 2k 8bit 35ns 8bit - Yes Asynchronous Through Hole PDIP 48 61.7 x 15.24 x 3.8mm 3.8mm
RS Stock No. 170-2078
Mfr. Part No.IDT71321LA25JGI
BrandIDT
TWD519.80
Each (In a Tube of 24)
units
16kbit 2k x 8 bit 2k 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 742-6715
Mfr. Part No.IDT71V416L10PHGI
BrandIDT
TWD311.00
Each
units
4Mbit 256K x 16 bit 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS Stock No. 714-4738
Mfr. Part No.IDT70V24L20PFGI
BrandIDT
TWD1,056.00
Each
units
64kbit 4K x 16 bit 4k 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 170-2150
Mfr. Part No.IDT71V416S10PHGI
BrandIDT
TWD240.50
Each (In a Tube of 26)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS Stock No. 170-2076
Mfr. Part No.IDT70V25L20PFGI
BrandIDT
TWD1,320.90
Each (In a Tray of 45)
units
128kbit 8k x 16 bit 8k 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 742-4692
Mfr. Part No.IDT6116LA25SOGI
BrandIDT
TWD180.00
Each
units
16kbit 2K x 8 bit 2k 8bit 25ns 11bit - Yes Asynchronous Surface Mount SOIC 24 15.4 x 7.6 x 2.34mm 2.34mm
RS Stock No. 714-4788
Mfr. Part No.IDT7133LA25JGI
BrandIDT
TWD961.00
Each
units
32kbit 2K x 16 bit 2k 16bit 25ns 16bit - Yes Asynchronous Surface Mount PLCC 68 24 x 24 x 3.63mm 3.63mm
RS Stock No. 170-2070
Mfr. Part No.IDT7133LA25JGI
BrandIDT
TWD850.10
Each (In a Tube of 18)
units
32kbit 2k x 16 bit 2k 16bit 25ns 16bit - Yes Asynchronous Surface Mount PLCC 68 24 x 24 x 3.63mm 3.63mm
RS Stock No. 742-6724
Mfr. Part No.IDT71V416S10PHGI
BrandIDT
TWD247.00
Each
units
4Mbit 256K x 16 bit 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm