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 126-6974
製造零件編號R1WV6416RSA-5SI#B0
TWD1,500.00
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 501-6785
製造零件編號R1RW0408DGE-2PR
TWD665.00
單位
4Mbit 512K words x 8 bit 512K 8bit 12ns 19bit - - Asynchronous Surface Mount SOJ 36 23.49 x 10.16 x 3.45mm 3.45mm
RS庫存編號 901-5727
製造零件編號R1LV1616RBG-7SI#B0
TWD928.00
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 126-6983
製造零件編號RMLV0816BGSB-4S2#AA0
TWD332.00
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 126-6973
製造零件編號R1LV5256ESP-5SI#B0
TWD114.00
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 126-6962
製造零件編號R1LP0108ESA-5SI#B1
TWD134.00
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 767-5979
製造零件編號R1RP0416DSB-2PI#D0
TWD740.00
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 772-6100
製造零件編號R1LP0108ESA-7SI#B0
TWD139.00
單位
1Mbit 128K x 8 bit 128K 8 70ns 17bit - Yes Asynchronous Surface Mount STSOP 32 11.9 x 8.1 x 1mm 1mm
RS庫存編號 901-5809
製造零件編號R1LP0108ESA-5SI#B0
TWD149.50
個 (以毎袋:2)
單位
1Mbit 128K x 8 bit 128K 8bit 55ns 8bit 1MHz Yes - Surface Mount TSOP 32 11.9 x 8.1 x 1mm 1mm
RS庫存編號 577-721
製造零件編號R1LP0408CSB-7LC#BT
TWD680.00
單位
4Mbit 512K x 8 bit 512K 8bit 70ns 19bit - Yes Asynchronous Surface Mount TSOP 32 - -
RS庫存編號 501-6684
製造零件編號R1RP0404DGE-2LR
TWD785.00
單位
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庫存編號 901-5761
製造零件編號R1RW0408DGE-2PR#B0
TWD529.00
單位
4Mbit 512K x 8 bit 512K 8bit 12ns 8bit 1MHz - - Surface Mount SOJ 36 23.62 x 10.29 x 3.05mm 3.05mm
RS庫存編號 901-5802
製造零件編號R1LP0108ESN-5SI#B0
TWD134.00
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 761-7074
製造零件編號R1LV0408CSA-5SI#B0
TWD506.00
單位
4Mbit 512K x 8 bit 512K 8bit 55ns - - Yes Asynchronous Surface Mount STSOP 32 - -
RS庫存編號 501-6729
製造零件編號R1RP0416DGE-2LR
TWD761.00
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 901-5843
製造零件編號RMLV0414EGSB-4S2#AA0
TWD392.00
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 761-7052
製造零件編號R1LP0108ESR-5SI#B0
TWD170.00
單位
1Mbit 128K x 8 bit 128K 8bit 55ns - - Yes Asynchronous Surface Mount TSOP 32 - -
RS庫存編號 901-5723
製造零件編號R1LV1616RBG-5SI#B0
TWD869.00
單位
16Mbit 1M x 16 bit 1M 16bit 55ns - - Yes Asynchronous Surface Mount FBGA 48 7.5 x 8.5 x 0.8mm 0.8mm
RS庫存編號 126-6982
製造零件編號RMLV0816BGSA-4S2#AA0
TWD332.00
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 48 18.5 x 12.1 x 1.05mm 1.05mm
RS庫存編號 767-5951
製造零件編號R1LV3216RSD-5SI#B0
TWD1,142.00
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