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$131.74
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 125-7518
製造零件編號CY62177EV30LL-55ZXI
HK$494.10
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 171-0984
製造零件編號CY62177EV30LL-55ZXI
HK$495.737
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
全新
RS庫存編號 194-8881
製造零件編號CY62158EV30LL-45BVXI
HK$53.892
Each (In a Tray of 480)
單位
- - - - - - - - - - - - - -
全新
RS庫存編號 194-8882
製造零件編號CY62158EV30LL-45BVXI
HK$61.145
/個 (每包:2個)
單位
- - - - - - - - - - - - - -
全新
RS庫存編號 194-8888
製造零件編號CY62167EV18LL-55BVXI
HK$121.95
單位
- - - - - - - - - - - - - -
RS庫存編號 181-1578
製造零件編號CY7C1041GN30-10ZSXI
HK$39.02
/個 (每包:2個)
單位
4Mbit 256k x 16 bit 256k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
全新
RS庫存編號 194-8933
製造零件編號CY7C1345G-100AXI
HK$59.196
Each (In a Tray of 72)
單位
- - - - - - - - - - - - - -
RS庫存編號 181-8269
製造零件編號CY7C1069G30-10ZSXI-CYP
HK$460.844
Each (In a Tray of 108)
單位
16Mbit 2M x 8 bit 2M 8bit 10ns - 100MHz - Asynchronous Surface Mount TSOP 54 22.51 x 10.26 x 1.05mm 1.05mm
全新
RS庫存編號 194-8873
製造零件編號CY62147EV30LL-45BVXI
HK$38.499
Each (In a Tray of 480)
單位
- - - - - - - - - - - - - -
RS庫存編號 125-6933
製造零件編號CY14B101LA-ZS25XI
HK$184.12
單位
1Mbit 64K x 16 bit, 128K x 8 bit 64k, 128 k 8 bit, 16bit 25ns 8 bit, 16 bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 182-3344
製造零件編號CY7C1041G-10VXI
HK$58.35
/個 (每包:2個)
單位
- - - - - - - - - - - - - -
全新
RS庫存編號 194-8953
製造零件編號CY7C1381KV33-100AXC
HK$247.784
Each (In a Tray of 72)
單位
- - - - - - - - - - - - - -
全新
RS庫存編號 194-8883
製造零件編號CY62167DV30LL-55BVXI
HK$97.783
Each (In a Tray of 210)
單位
- - - - - - - - - - - - - -
RS庫存編號 193-8454
製造零件編號CY62146ELL-45ZSXI
HK$73.486
Each (In a Tray of 135)
單位
4Mbit 256k x 16 bit 256k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS庫存編號 198-8007
製造零件編號CY7C1049GN30-10VXIT
HK$37.30
個 (在毎卷:500)
單位
4096kbit 512k x 8 bit 512k 16bit 10ns - - - - - - - - -
全新
RS庫存編號 194-8934
製造零件編號CY7C1345G-100AXI
HK$66.465
/個 (每包:2個)
單位
- - - - - - - - - - - - - -
RS庫存編號 181-8270
製造零件編號CY14B101PA-SFXI
HK$96.178
毎管:46 個
單位
1Mbit 128k x 8 bit 128k 8bit - - 104MHz Yes Synchronous Surface Mount SOIC 16 10.49 x 7.59 x 2.36mm 2.36mm
全新
RS庫存編號 194-8874
製造零件編號CY62147EV30LL-45BVXI
HK$45.30
/個 (每包:2個)
單位
- - - - - - - - - - - - - -
RS庫存編號 188-5340
製造零件編號CY7C199D-10VXI
HK$19.153
毎管:27 個
單位
256kbit 32k x 8 bit 32k 8bit 10ns 8bit 100MHz - - Surface Mount TSOP 28 11.9 x 8.1 x 1.15mm 1.15mm