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 193-8471
製造零件編號CY7C199D-10VXIT
HK$11.134
個 (在毎卷:1000)
單位
256kbit 32 k x 8 bit 32 k 8bit 10ns 8bit 1MHz - Asynchronous Through Hole SOJ 85 11.9 x 8.1 x 1mm 1mm
RS庫存編號 538-259
製造零件編號AS7C34096A-12JIN
HK$44.55
單位
4Mbit 512K words x 8 bit 512K 8bit 12ns 19bit - Yes Asynchronous Surface Mount SOJ 36 23.62 x 10.16 x 2.95mm 2.95mm
RS庫存編號 181-7442
製造零件編號CY62148ELL-55SXIT
HK$26.828
個 (在毎卷:1000)
單位
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS庫存編號 171-0970
製造零件編號CY62137FV30LL-45BVXI
HK$21.425
Each (In a Tray of 480)
單位
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount VFBGA 48 6 x 8 x 0.81mm 0.81mm
RS庫存編號 538-249
製造零件編號AS7C4098A-12TIN
HK$44.55
單位
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS庫存編號 170-2186
製造零件編號IS61WV6416DBLL-10TLI
BrandISSI
HK$16.356
Each (In a Tray of 135)
單位
1Mbit 64k x 16 64k 16bit 10ns 16bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
全新
RS庫存編號 200-9831
製造零件編號48LM01-I/SM
BrandMicrochip
HK$33.177
/個 (每包:3個)
單位
1Mbit 128k x 8 1, 31, 072 8bit 10ns - - - - - - - - -
RS庫存編號 146-3211
製造零件編號47L04-I/P
BrandMicrochip
HK$6.261
毎管:60 個
單位
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Through Hole DIP 8 10.2 x 7.1 x 4.83mm 4.83mm
RS庫存編號 189-9175
製造零件編號DS1245Y-100+
HK$250.14
單位
1Mbit 128K x 8 bit 128K 8bit 100ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS庫存編號 171-0994
製造零件編號CY7C1350G-133AXC
HK$47.92
Each (In a Tray of 360)
單位
4Mbit 128K x 36 bit 128K 36bit - - - Yes - Surface Mount TQFP 100 14.1 x 20.1 x 1.45mm 1.45mm
RS庫存編號 797-5881
製造零件編號AS7C38098A-10TIN
HK$126.04
單位
8Mbit 512K x 16 bit 512K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
RS庫存編號 177-1641
製造零件編號23K640-I/ST
BrandMicrochip
HK$5.72
/個 (每包:20個)
單位
64kbit 8192 words x 8 bit 8192 8bit - 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm
RS庫存編號 165-9425
製造零件編號DS1220AD-150+
HK$112.87
毎管:14 個
單位
16kbit 2K x 8 bit 2K 8bit 100ns 8bit - Yes - Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 10.67mm
RS庫存編號 538-154
製造零件編號AS6C8008-55ZIN
HK$56.25
單位
8Mbit 1024K words x 8 bit 1M 8bit 55ns 20bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS庫存編號 171-0974
製造零件編號CY62148ESL-55ZAXI
HK$47.41
Each (In a Tray of 234)
單位
4Mbit 512K x 8 bit 512K 8bit 55ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS庫存編號 181-7582
製造零件編號CY62147EV30LL-45ZSXI
HK$25.473
/個 (每包:3個)
單位
4Mbit 256K x 16 bit 256K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS庫存編號 125-7537
製造零件編號CY7C107D-10VXI
HK$276.87
單位
1Mbit 1M x 1 bit 1M 1bit 10ns - - Yes - Surface Mount SOJ 28 18.54 x 10.29 x 3.124mm 3.124mm
RS庫存編號 124-2937
製造零件編號CY62128EV30LL-45ZAXI
HK$13.75
/個 (每包:5個)
單位
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS庫存編號 170-0751
製造零件編號AS7C3256A-12TIN
HK$14.29
Each (In a Tray of 234)
單位
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS庫存編號 124-2943
製造零件編號CY62157EV30LL-45BVXI
HK$71.04
單位
8Mbit 1M x 8 bit, 512K x 16 bit 512K 8 bit, 16 bit 45ns 8 bit, 16 bit 1MHz Yes - Surface Mount VFBGA 48 6 x 8 x 0.79mm 0.79mm