Instruction/ maintenance manual of the product STK22C48 Cypress Semiconductor
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STK22C48 16 Kbit (2K x 8) AutoS tore nvSRAM Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document Number: 001-51000 Rev .
STK22C48 Document Number: 001-51000 Rev . ** Page 2 of 14 Pin Configurations Figure 1. Pin Di agram - 28-Pin SOI C T able 1. Pin Definitions Pin Name Alt IO T ype Description A 0 –A 10 Input Address Inputs. Used to select one of the 2, 048 bytes of the nvSRAM.
STK22C48 Document Number: 001-51000 Rev . ** Page 3 of 14 Device Operation The STK22C48 nvSRAM is mad e up of two functional compo- nents paired in the same physical cell. These ar e an SRAM memory cell and a nonvolatile QuantumTrap cell. The SRAM memory cell operates as a standard fast static RAM.
STK22C48 Document Number: 001-51000 Rev . ** Page 4 of 14 Figure 3. Aut oStore In hibit Mode Hardware STORE (HSB ) Operation The STK22C48 provides the HSB pin for controlling and acknowledging the STORE operations. The HSB pin is used to request a hardware ST OR E cycle.
STK22C48 Document Number: 001-51000 Rev . ** Page 5 of 14 Preventing Store The STORE function is disabled by holding HSB high with a driver capable of sourcing 30 mA at a V OH of at least 2.2V , because it must ov erpower the inte rnal pull down device.
STK22C48 Document Number: 001-51000 Rev . ** Page 6 of 14 Maximum Ratin gs Exceeding maximum ratings may shorten the useful life of the device. These user guid elines are not tested. S torage T emperature ................ .............. .. . –65 ° C to +150 ° C T emperature under bias .
STK22C48 Document Number: 001-51000 Rev . ** Page 7 of 14 Cap acit ance In the following table, the capacitance parameters are listed. [5] Parameter Description T est Conditions Max Unit C IN Input Capacitance T A = 25 ° C, f = 1 MHz, V CC = 0 to 3.
STK22C48 Document Number: 001-51000 Rev . ** Page 8 of 14 AC Switching Characteristics SRAM Read Cycle Parameter Description 25 ns 45 ns Unit Min Max Min Max Cypress Parameter Alt t ACE t ELQV Chip En.
STK22C48 Document Number: 001-51000 Rev . ** Page 9 of 14 SRAM Write Cycle Parameter Description 25 ns 45 ns Unit Min Max Min Max Cypress Parameter Alt t WC t AVAV Write Cycle T ime 25 45 ns t PWE t W.
STK22C48 Document Number: 001-51000 Rev . ** Page 10 of 14 AutoS tore or Power Up RECALL Parameter Alt Description STK22C48 Unit Min Max t HRECALL [12] t REST ORE Power up RECALL Duration 550 μ s t S.
STK22C48 Document Number: 001-51000 Rev . ** Page 1 1 of 14 Hardware STORE Cycle Parameter Alt Description STK22C48 Unit Min Max t DHSB [13, 16] t RECOVER, t HHQX Hardware STORE High to Inhibit Off 700 ns t PHSB t HLHX Hardware STORE Pulse Width 15 ns t HLBL Hardware ST ORE Low to ST ORE Busy 300 ns Switching W aveform Figure 12.
STK22C48 Document Number: 001-51000 Rev . ** Page 12 of 14 Ordering Information Spee d ( ns ) Ordering Code Package Diagram Package T ype Operating Range 25 STK22C48-NF25TR 51-85026 28-pin SOIC (300 m.
STK22C48 Document Number: 001-51000 Rev . ** Page 13 of 14 Package Diagrams Figure 13. 28-Pin (300 mil) S OIC (51-85026) Figure 14. 28- Pin (330 mil) SOIC (51-85058) PIN 1 ID 0.291[7.39] 0.300[7.62] 0.394[10.01] 0.419[10.64] 0.050[1.27] TYP. 0.092[2.33] 0.
Document Number: 001-51000 Rev . ** Revised January 30, 20 09 Page 14 of 14 AutoS tore and Qua ntumTr ap are registered tr ademarks of Cypress Se miconductor Corpor ation. All produ cts and comp any names mentio ned in this document may be the trademarks of thei r respective holders.
An important point after buying a device Cypress Semiconductor STK22C48 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of Cypress Semiconductor STK22C48, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cypress Semiconductor STK22C48.
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