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
$99.14
Each
units
16Mbit 1M words x 16 bit 1M 16bit 45ns 20bit - Yes - Surface Mount FBGA 48 8 x 9.5 x 0.9mm 0.9mm
RS Stock No. 761-7052
Mfr. Part No.R1LP0108ESR-5SI#B0
$8.77
Each
units
1Mbit 128K x 8 bit 128K 8bit 55ns - - Yes Asynchronous Surface Mount TSOP 32 - -
RS Stock No. 761-7071
Mfr. Part No.R1LV0216BSB-5SR#B0
$6.79
Each
units
2Mbit 128K x 16 bit 128K 16bit 55ns - - Yes Asynchronous Surface Mount TSOP 44 - -
RS Stock No. 901-5783
Mfr. Part No.R1LV1616HBG-4SI#B0
$90.64
Each
units
16Mbit 1M x 16 bit 1M 16bit 45ns - - Yes Asynchronous Surface Mount FBGA 48 8 x 9.5 x 0.9mm 0.9mm
RS Stock No. 126-6981
Mfr. Part No.RMLV0816BGBG-4S2#AC0
$39.99
Each
units
8Mbit 512K words x 16 bit 512K 16bit 45ns 19bit - Yes - Surface Mount FBGA 48 7.58 x 8.58 x 0.8mm 0.8mm
RS Stock No. 767-5979
Mfr. Part No.R1RP0416DSB-2PI#D0
$47.93
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns - - Yes Asynchronous Surface Mount TSOP 32 21.05 x 10.26 x 1mm 1mm
RS Stock No. 501-6729
Mfr. Part No.R1RP0416DGE-2LR
$40.92
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - - Asynchronous Surface Mount SOJ 44 28.57 x 10.16 x 3.45mm 3.45mm
RS Stock No. 761-7065
Mfr. Part No.R1LP0408CSP-7LC#B0
$15.21
Each
units
4Mbit 512K x 8 bit 512K 8bit 70ns - - Yes Asynchronous Surface Mount SOP 32 - -
RS Stock No. 126-6983
Mfr. Part No.RMLV0816BGSB-4S2#AA0
$51.21
Each
units
8Mbit 512K words x 16 bit 512K 16bit 45ns 19bit - Yes - Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 501-6684
Mfr. Part No.R1RP0404DGE-2LR
$39.13
Each
units
4Mbit 1M words x 4 bit 1M 4bit 12ns 20bit - - Asynchronous Surface Mount SOJ 32 20.95 x 10.16 x 3.45mm 3.45mm
RS Stock No. 501-6836
Mfr. Part No.R1RW0416DSB-2PR
$37.33
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS Stock No. 767-5963
Mfr. Part No.R1WV6416RBG-7SI#B0
$98.19
Each
units
64Mbit 4M words x 16 bit 4M 16bit 70ns - - Yes Asynchronous Surface Mount FBGA 48 8.5 x 11 x 0.8mm 0.8mm
RS Stock No. 126-6975
Mfr. Part No.RMLV0408EGSA-4S2#AA1
$29.54
Each
units
4Mbit 512K words x 8 bit 512K 8bit 45ns 19bit - Yes - Surface Mount sTSOP 32 11.9 x 8.1 x 1mm 1mm
RS Stock No. 761-7074
Mfr. Part No.R1LV0408CSA-5SI#B0
$26.30
Each
units
4Mbit 512K x 8 bit 512K 8bit 55ns - - Yes Asynchronous Surface Mount STSOP 32 - -
RS Stock No. 126-6978
Mfr. Part No.RMLV0416EGBG-4S2#AC0
$23.05
Each
units
4Mbit 256K words x 16 bit 256K 16bit 45ns 18bit - Yes - Surface Mount FBGA 48 7.58 x 8.58 x 0.8mm 0.8mm
RS Stock No. 761-7056
Mfr. Part No.R1LP0108ESR-7SI#B0
$8.77
Each
units
1Mbit 128K x 8 bit 128K 8bit 70ns - - Yes Asynchronous Surface Mount TSOP 32 - -
RS Stock No. 901-5727
Mfr. Part No.R1LV1616RBG-7SI#B0
$65.13
Each
units
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16 bit 70ns 8 bit, 16 bit 1MHz - - Surface Mount TFBGA 48 7.5 x 8.5 x 0.8mm 0.8mm
RS Stock No. 577-705
Mfr. Part No.R1LP0408CSC-5SC#BT
$16.23
Each
units
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 - -
RS Stock No. 901-5802
Mfr. Part No.R1LP0108ESN-5SI#B0
$6.445
Each (In a Bag of 2)
units
1Mbit 128K x 8 bit 128K 8bit 55ns 8bit 1MHz Yes - Surface Mount SOP 32 20.95 x 11.5 x 2.85mm 2.85mm