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庫存編號 126-6979
製造零件編號RMLV0416EGSB-4S2#AA1
HK$111.20
單位
4Mbit 256K words x 16 bit 256K 16bit 45ns 18bit - Yes - Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS庫存編號 126-6983
製造零件編號RMLV0816BGSB-4S2#AA0
HK$225.26
單位
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庫存編號 767-5963
製造零件編號R1WV6416RBG-7SI#B0
HK$520.28
單位
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庫存編號 901-5843
製造零件編號RMLV0414EGSB-4S2#AA0
HK$88.64
單位
4Mbit 256K x 16 bit 256K 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1mm 1mm
RS庫存編號 126-6984
製造零件編號RMLV0816BGSD-4S2#AC0
HK$192.75
單位
8Mbit 512K words x 16 bit, 1024K words x 8 bit 512K, 1024K 8 bit, 16 bit 45ns 18 bit, 19 bit - Yes - Surface Mount TSOP 52 10.89 x 8.99 x 1mm 1mm
RS庫存編號 126-6962
製造零件編號R1LP0108ESA-5SI#B1
HK$42.36
單位
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1mm 1mm
RS庫存編號 126-7312
製造零件編號RMLV1616AGSD-5S2#AC0
HK$299.82
單位
16Mbit 1M words x 16 bit, 2M words x 8 bit 1M, 2M 8 bit, 16 bit 55ns 19 bit, 20 bit - Yes - Surface Mount TSOP 52 10.89 x 8.99 x 1mm 1mm
RS庫存編號 767-5967
製造零件編號R1WV6416RSD-5SI#B0
HK$520.28
單位
64Mbit 4M words x 16 bit 4M 16bit 55ns - - Yes Asynchronous Surface Mount μTSOP II 52 10.89 x 8.99 x 1mm 1mm
RS庫存編號 901-5727
製造零件編號R1LV1616RBG-7SI#B0
HK$226.50
單位
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庫存編號 501-6729
製造零件編號R1RP0416DGE-2LR
HK$163.13
單位
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庫存編號 126-6980
製造零件編號RMLV0808BGSB-4S2#AA0
HK$192.75
單位
8Mbit 1024K words x 8 bit 1024K 8bit 45ns 20bit - Yes - Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS庫存編號 767-5979
製造零件編號R1RP0416DSB-2PI#D0
HK$181.83
單位
4Mbit 256K words x 16 bit 256K 16bit 12ns - - Yes Asynchronous Surface Mount TSOP 32 21.05 x 10.26 x 1mm 1mm
RS庫存編號 126-6969
製造零件編號R1LV1616HSA-4SI#B1
HK$444.09
單位
16Mbit 1M words x 16 bit, 2M words x 8 bit 1M, 2M 8 bit, 16 bit 45ns 19 bit, 20 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS庫存編號 126-6972
製造零件編號R1LV5256ESA-5SI#B1
HK$31.77
單位
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes - Surface Mount SOP 28 11.9 x 8.1 x 1mm 1mm
RS庫存編號 901-5783
製造零件編號R1LV1616HBG-4SI#B0
HK$380.40
單位
16Mbit 1M x 16 bit 1M 16bit 45ns - - Yes Asynchronous Surface Mount FBGA 48 8 x 9.5 x 0.9mm 0.9mm
RS庫存編號 126-6971
製造零件編號R1LV3216RSA-5SI#B1
HK$599.90
單位
32Mbit 2M words x 16 bit, 4M words x 8 bit 2M, 4M 8 bit, 16 bit 55ns 20 bit, 21 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS庫存編號 901-5749
製造零件編號R1RP0416DGE-2PR#B0
HK$136.53
單位
4Mbit 256K x 16 bit 256K 16bit 12ns 16bit 1MHz - - Surface Mount SOJ 44 28.7 x 10.29 x 2.75mm 2.75mm
RS庫存編號 126-6978
製造零件編號RMLV0416EGBG-4S2#AC0
HK$111.20
單位
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庫存編號 126-6973
製造零件編號R1LV5256ESP-5SI#B0
HK$30.02
單位
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes - Surface Mount SOP 28 11.9 x 8.1 x 1mm 1mm
RS庫存編號 126-6974
製造零件編號R1WV6416RSA-5SI#B0
HK$1,080.11
單位
64Mbit 4M words x 16 bit, 8M words x 8 bit 4M, 8M 8 bit, 16 bit 55ns 21 bit, 22 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1mm 1mm