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 125-7535
製造零件編號CY7C1051DV33-10ZSXI
HK$134.83
單位
8Mbit 512K x 16 bit 512K 16bit 10ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 171-0984
製造零件編號CY62177EV30LL-55ZXI
HK$418.226
Each (In a Tray of 96)
單位
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS庫存編號 125-7518
製造零件編號CY62177EV30LL-55ZXI
HK$499.90
單位
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS庫存編號 181-7594
製造零件編號CY7C1041GN-10ZSXI
HK$44.60
/個 (每包:2個)
單位
4Mbit 256K x 16 bit 256K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS庫存編號 181-7610
製造零件編號CY7C1021DV33-10ZSXIT
HK$24.02
/個 (每包:3個)
單位
1Mbit 64K x 16 bit 64K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS庫存編號 171-0991
製造零件編號CY7C1021CV33-12ZSXE
HK$37.736
Each (In a Tray of 270)
單位
1Mbit 64K x 16 bit 64K 16bit 12ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 171-0968
製造零件編號CY62128ELL-45ZXI
HK$18.134
Each (In a Tray of 312)
單位
1Mbit 128K x 16 bit 128K 16bit 45ns 6bit - Yes - Surface Mount SOIC 32 20.751 x 11.43 x 2.895mm 2.895mm
RS庫存編號 181-7582
製造零件編號CY62147EV30LL-45ZSXI
HK$33.353
/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 181-7597
製造零件編號CY62148EV30LL-45ZSXI
HK$40.615
/個 (每包:2個)
單位
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS庫存編號 124-2941
製造零件編號CY62148ELL-55SXI
HK$46.235
/個 (每包:2個)
單位
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS庫存編號 182-3344
製造零件編號CY7C1041G-10VXI
HK$59.745
/個 (每包:2個)
單位
- - - - - - - - - - - - - -
RS庫存編號 171-0969
製造零件編號CY62137EV30LL-45ZSXI
HK$26.354
Each (In a Tray of 405)
單位
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 181-8389
製造零件編號CY14E256LA-SZ25XI
HK$181.05
單位
256kbit 32K x 8 bit 32K 8bit 25ns - - Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm
RS庫存編號 125-6975
製造零件編號CY62137EV30LL-45ZSXI
HK$35.085
/個 (每包:2個)
單位
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 171-0992
製造零件編號CY7C1041CV33-8ZSXI
HK$56.136
Each (In a Tray of 135)
單位
4Mbit 256K x 16 bit 256K 16bit 8ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 181-7449
製造零件編號CY7C1049G-10VXI
HK$54.486
毎管:19 個
單位
4Mbit 512K x 8 bit 512K 8bit 10ns - - - Asynchronous Surface Mount SOJ 36 0.93 x 0.405 x 0.12in 3.05mm
全新
RS庫存編號 188-5321
製造零件編號CY62136EV30LL-45ZSXI
HK$26.615
Each (In a Tray of 135)
單位
2Mbit 128k x 16 bit 128k 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS庫存編號 125-7532
製造零件編號CY7C1021CV33-12ZSXE
HK$49.97
/個 (每包:2個)
單位
1Mbit 64K x 16 bit 64K 16bit 12ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 125-7538
製造零件編號CY7C1350G-133AXC
HK$67.76
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 182-3336
製造零件編號CY7C1021DV33-10BVXI
HK$24.02
/個 (每包:3個)
單位
- - - - - - - - - - - - - -