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 170-2073
製造零件編號IDT70V28L20PFGI
BrandIDT
TWD2,364.50
Each (In a Tray of 6)
單位
1024kbit 64K x 16 bit 64K 16bit 20ns 16bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS庫存編號 391-707
製造零件編號IS61LV25616AL-10TLI
BrandISSI
TWD149.00
單位
4Mbit 256K words x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS庫存編號 178-4005
製造零件編號23K640-I/SN
BrandMicrochip
TWD18.40
毎管:100 個
單位
64kbit 8192 words x 8 bit 8K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS庫存編號 171-0987
製造零件編號CY7C1019D-10ZSXI
TWD138.30
Each (In a Tray of 468)
單位
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS庫存編號 170-0742
製造零件編號AS7C34098A-12TIN
TWD139.80
Each (In a Tray of 135)
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 827-2571
製造零件編號CY7C1019D-10ZSXI
TWD140.40
/個 (每包:5個)
單位
1Mbit 128k x 8 128K 8bit 10ns 17bit 100MHz Yes Asynchronous Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS庫存編號 714-4801
製造零件編號IDT70V28L20PFGI
BrandIDT
TWD2,516.00
單位
1024kbit 64K x 16 bit 64K 16bit 20ns 16bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS庫存編號 125-7515
製造零件編號CY62167DV30LL-70BVI
TWD327.00
單位
16Mbit 1M x 16 bit 1M 16bit 70ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 0.81mm 0.81mm
RS庫存編號 170-2043
製造零件編號IS62WV25616BLL-55TLI
BrandISSI
TWD171.00
Each (In a Tray of 135)
單位
4Mbit 256K words x 16 bit 256K 16bit 55ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS庫存編號 538-192
製造零件編號AS7C34098A-12JIN
TWD176.00
單位
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount SOJ 44 28.7 x 10.29 x 2.92mm 2.92mm
RS庫存編號 391-725
製造零件編號IS61C1024AL-12KLI
BrandISSI
TWD70.00
/個 (每包:2個)
單位
1Mbit 128K words x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 10.29 x 3.75mm 3.75mm
RS庫存編號 193-8459
製造零件編號CY62256NLL-55ZXIT
TWD55.20
/個 (每包:5個)
單位
256kbit 32 k x 8 bit 32 k 8bit 55ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP I 28 11.9 x 8.1 x 1mm 1mm
RS庫存編號 811-5185
製造零件編號IS61WV25616EDBLL-10TLI
BrandISSI
TWD112.00
/個 (每包:2個)
單位
4Mbit 256k x 16 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS庫存編號 171-0980
製造零件編號CY62167DV30LL-55ZXI
TWD502.00
Each (In a Tray of 192)
單位
16Mbit 1M x 16 bit 1M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS庫存編號 171-0972
製造零件編號CY62138EV30LL-45BVXI
TWD118.00
Each (In a Tray of 480)
單位
2Mbit 256K x 8 bit 256K 8bit 45ns 8bit - Yes - Surface Mount VFBGA 36 6 x 8 x 0.81mm 0.81mm
RS庫存編號 125-7516
製造零件編號CY62167EV30LL-45ZXA
TWD420.00
單位
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS庫存編號 811-5157
製造零件編號IS61C25616AL-10TLI
BrandISSI
TWD152.50
/個 (每包:2個)
單位
4Mbit 256k x 16 256k 16bit 10ns 18bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS庫存編號 666-8148
製造零件編號23K256-I/SN
BrandMicrochip
TWD38.00
/個 (每包:5個)
單位
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS庫存編號 125-6972
製造零件編號CY62128ELL-45ZXI
TWD88.40
/個 (每包:5個)
單位
1Mbit 128K x 16 bit 128K 16bit 45ns 6bit - Yes - Surface Mount TSOP 32 20.751 x 11.43 x 2.895mm 2.895mm
RS庫存編號 188-5303
製造零件編號CY14E256LA-SZ45XI
TWD631.00
毎管:22 個
單位
256kbit 32k x 8 bit 32k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm