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 538-148
製造零件編號AS6C62256-55PCN
TWD70.50
/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
TWD74.10
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 538-142
製造零件編號AS6C62256-55SIN
TWD64.00
/個 (每包:2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 170-0735
製造零件編號AS6C62256-55SIN
TWD63.40
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 170-0742
製造零件編號AS7C34098A-12TIN
TWD147.10
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 797-5872
製造零件編號AS7C316098A-10TIN
TWD715.00
單位
16Mbit 1024K x 16 bit 1024K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS庫存編號 538-198
製造零件編號AS7C34098A-12TIN
TWD146.00
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 744-4555
製造零件編號AS7C3513B-12TCN
TWD78.00
單位
512kbit 32K x 16 bit 32K 16bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS庫存編號 170-0743
製造零件編號AS7C4098A-12JIN
TWD170.60
毎管:16 個
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 744-4558
製造零件編號AS7C31024B-12TCN
TWD96.00
單位
1Mbit 128K x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount TSOP 32 18.5 x 8.1 x 1.05mm 1.05mm
RS庫存編號 170-0891
製造零件編號AS6C1008-55PCN
TWD76.00
毎管:13 個
單位
1Mbit 128K x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS庫存編號 744-4539
製造零件編號AS6C1008-55STIN
TWD61.50
/個 (每包:2個)
單位
1048576bit 128K x 8 bit 128K 8bit 55ns - - Yes - Surface Mount STSOP 32 11.8 x 8 x 1mm 1mm
RS庫存編號 538-176
製造零件編號AS6C1008-55TIN
TWD46.50
/個 (每包:2個)
單位
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS庫存編號 170-0738
製造零件編號AS6C4008-55SIN
TWD134.20
毎管:22 個
單位
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS庫存編號 170-0892
製造零件編號AS7C1026B-12TCN
TWD74.30
Each (In a Tray of 135)
單位
1Mbit 64K x 16 bit 64K 16bit 12ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS庫存編號 538-271
製造零件編號AS6C8016-55ZIN
TWD254.00
單位
8Mbit 512K words x 16 bit 512K 16bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS庫存編號 538-158
製造零件編號AS6C6264-55PCN
TWD77.50
/個 (每包:2個)
單位
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS庫存編號 170-0888
製造零件編號U62256AS2C07LLG1
TWD78.20
毎管:25 個
單位
256kbit 32K x 8 bit 32K 8bit 56ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS庫存編號 744-4573
製造零件編號AS7C34098A-10TCN
TWD182.00
單位
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS庫存編號 170-0753
製造零件編號AS7C256A-12JIN
TWD67.40
毎管:25 個
單位
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount SOJ 28 18.54 x 7.75 x 2.67mm 2.67mm