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 767-5960
製造零件編號R1WV6416RBG-5SI#B0
TWD2,116
單位
64Mbit 4M words x 16 bit 4M 16bit 55ns - - Yes Asynchronous Surface Mount FBGA 48 8.5 x 11 x 0.8mm 0.8mm
RS庫存編號 126-6974
製造零件編號R1WV6416RSA-5SI#B0
TWD4,227
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
RS庫存編號 126-6983
製造零件編號RMLV0816BGSB-4S2#AA0
TWD881
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 577-727
製造零件編號R1LP0408CSB-5SI#BT
TWD730
單位
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 - -
RS庫存編號 126-6980
製造零件編號RMLV0808BGSB-4S2#AA0
TWD724
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 901-5783
製造零件編號R1LV1616HBG-4SI#B0
TWD1,509
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 767-5963
製造零件編號R1WV6416RBG-7SI#B0
TWD1,955
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 772-6178
製造零件編號R1LV0416DSB-7LI#B0
TWD366
單位
4Mbit 256K x 16 bit 256K 16 70ns 18bit - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1mm 1mm
RS庫存編號 577-705
製造零件編號R1LP0408CSC-5SC#BT
TWD673
單位
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 - -
RS庫存編號 126-7312
製造零件編號RMLV1616AGSD-5S2#AC0
TWD1,126
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
TWD1,955
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
TWD928
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 901-5802
製造零件編號R1LP0108ESN-5SI#B0
TWD142
個 (以毎袋:2)
單位
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
RS庫存編號 126-6981
製造零件編號RMLV0816BGBG-4S2#AC0
TWD724
單位
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庫存編號 126-6966
製造零件編號R1LV0108ESA-5SI#B1
TWD193
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 501-6729
製造零件編號R1RP0416DGE-2LR
TWD761
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 761-7074
製造零件編號R1LV0408CSA-5SI#B0
TWD506
單位
4Mbit 512K x 8 bit 512K 8bit 55ns - - Yes Asynchronous Surface Mount STSOP 32 - -
RS庫存編號 761-7056
製造零件編號R1LP0108ESR-7SI#B0
TWD170
單位
1Mbit 128K x 8 bit 128K 8bit 70ns - - Yes Asynchronous Surface Mount TSOP 32 - -
RS庫存編號 761-7065
製造零件編號R1LP0408CSP-7LC#B0
TWD293
單位
4Mbit 512K x 8 bit 512K 8bit 70ns - - Yes Asynchronous Surface Mount SOP 32 - -
RS庫存編號 767-5951
製造零件編號R1LV3216RSD-5SI#B0
TWD2,260
單位
32Mbit 2M words x 16 bit 2M 16bit 55ns - - Yes Asynchronous Surface Mount μTSOP II 52 10.89 x 8.99 x 1mm 1mm