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

  • 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

Applications

  • Computers
  • Workstations
  • Routers
  • LCD screens and printers
  • Electronics
  • Microprocessors

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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
New
RS Stock No. 194-8904
Mfr. Part No.CY7C1019DV33-10BVXI
MYR15.65
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
New
RS Stock No. 194-8863
Mfr. Part No.CY62137FV18LL-55BVXI
MYR18.747
Each (In a Tray of 480)
units
- - - - - - - - - - - - - -
RS Stock No. 803-2184
Mfr. Part No.23LCV512-I/P
BrandMicrochip
MYR8.36
Each (In a Pack of 5)
units
512kbit 64k x 8 bit 64k 8bit 5ns 16bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 181-1549
Mfr. Part No.CY7C1041GN30-10ZSXI
MYR15.26
Each (In a Tray of 135)
units
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
New
RS Stock No. 194-8917
Mfr. Part No.CY7C1041GN30-10BVJXI
MYR19.639
Each (In a Tray of 480)
units
- - - - - - - - - - - - - -
RS Stock No. 200-9830
Mfr. Part No.48LM01-I/SM
BrandMicrochip
MYR17.424
Each (In a Tube of 90)
units
1Mbit 128k x 8 bit 128k 8bit 10ns - - - - - - - - -
RS Stock No. 125-7535
Mfr. Part No.CY7C1051DV33-10ZSXI
MYR58.41
Each
units
8Mbit 512K x 16 bit 512k 16bit 10ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
New
RS Stock No. 217-3663
Mfr. Part No.70V27L20PFGI
MYR313.26
Each
units
512kbit 32K x 16 32K 16bit 20ns - - - - - - - - -
RS Stock No. 811-5157
Mfr. Part No.IS61C25616AL-10TLI
BrandISSI
MYR22.59
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 192-1215
Mfr. Part No.DS1225AB-85+
MYR91.458
Each (In a Tube of 12)
units
64kbit 8k x 8 bit 8k 8bit 70ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
RS Stock No. 797-5881
Mfr. Part No.AS7C38098A-10TIN
MYR63.21
Each
units
8Mbit 512K x 16 bit 512k 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
RS Stock No. 181-7445
Mfr. Part No.CY7C1021DV33-10ZSXIT
MYR8.262
Each (On a Reel of 1000)
units
1Mbit 64k x 16 bit 64k 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 170-2069
Mfr. Part No.IDT7130LA25JGI
BrandIDT
MYR60.16
Each (In a Tube of 24)
units
8kbit 1k x 8 bit 1k 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 188-5322
Mfr. Part No.CY62146EV30LL-45ZSXI
MYR19.097
Each (In a Tray of 135)
units
4Mbit 512k x 8 bit 512k 8bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 171-0993
Mfr. Part No.CY7C1059DV33-10ZSXI
MYR52.972
Each (In a Tray of 135)
units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 192-1581
Mfr. Part No.DS1225AB-200+
MYR94.97
Each
units
64kbit 8k x 8 bit 8k 8bit 70ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
New
RS Stock No. 217-3692
Mfr. Part No.71V416S15PHG
MYR16.587
Each (In a Tube of 26)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
New
RS Stock No. 217-3648
Mfr. Part No.70V24L15PFG
MYR130.192
Each (In a Tray of 45)
units
64kbit 4K x 16 4K 16bit 15ns - - - - - - - - -
RS Stock No. 538-164
Mfr. Part No.AS6C4008-55TIN
MYR17.87
Each
units
4Mbit 512K words x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 188-5329
Mfr. Part No.CY62158EV30LL-45ZSXI
MYR26.486
Each (In a Tray of 135)
units
8Mbit 512k x 16 bit 512k 16bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm