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 124-2937
製造零件編號CY62128EV30LL-45ZAXI
TWD65
/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
全新
RS庫存編號 188-5320
製造零件編號CY62128EV30LL-45ZAXI
TWD60
Each (In a Tray of 234)
單位
1Mbit 128k x 8 bit 128k 8bit 45ns - 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS庫存編號 538-148
製造零件編號AS6C62256-55PCN
TWD71
/個 (每包:2個)
單位
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS庫存編號 170-0736
製造零件編號AS6C62256-55PCN
TWD74
毎管:15 個
單位
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS庫存編號 391-729
製造零件編號IS62C1024AL-35TLI
BrandISSI
TWD71
/個 (每包:2個)
單位
1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS庫存編號 923-7598
製造零件編號DS1225AD-200+
BrandMaxim
TWD556
毎管:12 個
單位
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS庫存編號 785-8691
製造零件編號DS1225AD-200+
BrandMaxim
TWD601
單位
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS庫存編號 170-2057
製造零件編號IS62C1024AL-35TLI
BrandISSI
TWD74
Each (In a Tray of 156)
單位
1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS庫存編號 811-5172
製造零件編號IS61C6416AL-12TLI
BrandISSI
TWD73
/個 (每包:3個)
單位
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS庫存編號 170-2179
製造零件編號IS61C6416AL-12TLI
BrandISSI
TWD78
Each (In a Tray of 135)
單位
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS庫存編號 170-2073
製造零件編號IDT70V28L20PFGI
BrandIDT
TWD2,376
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 923-7611
製造零件編號DS1245Y-100+
BrandMaxim
TWD980
毎管:11 個
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 714-4804
製造零件編號IDT70V27L15PFG
BrandIDT
TWD2,120
單位
512kbit 32K x 16 bit 32K 16bit 15ns 16bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS庫存編號 811-5175
製造零件編號IS61WV102416BLL-10TLI
BrandISSI
TWD716
單位
16Mbit 1M x 16 1M 16bit 10ns 20bit - Yes Asynchronous Surface Mount TSOP 48 18.6 x 12.2 x 1.05mm 1.05mm
RS庫存編號 170-0742
製造零件編號AS7C34098A-12TIN
TWD147
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 170-0735
製造零件編號AS6C62256-55SIN
TWD63
毎管:25 個
單位
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS庫存編號 827-2571
製造零件編號CY7C1019D-10ZSXI
TWD160
/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 786-0739
製造零件編號DS1245Y-100+
BrandMaxim
TWD1,043
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 714-4801
製造零件編號IDT70V28L20PFGI
BrandIDT
TWD2,245
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 666-8150
製造零件編號23K640-I/SN
BrandMicrochip
TWD21
/個 (每包:5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