CY14C256Q CY14B256Q CY14E256Q 256-Kbit (32 K 8) SPI nvSRAM 256-Kbit (32 K 8) SPI nvSRAM Industry standard configurations Features Operating voltages: 256-Kbit nonvolatile static random access memory (nvSRAM) CY14C256Q: V = 2.4 V to 2.6 V CC internally organized as 32 K 8 = 2.7 V to 3.6 V CY14B256Q: V CC STORE to QuantumTrap nonvolatile elements initiated CY14E256Q: V = 4.5 V to 5.5 V CC automatically on power-down (AutoStore) or by using SPI Industrial temperature instruction (Software STORE) or HSB pin (Hardware 8- and 16-pin small outline integrated circuit (SOIC) package STORE) Restriction of hazardous substances (RoHS) compliant RECALL to SRAM initiated on power-up (Power-Up RECALL) or by SPI instruction (Software RECALL) Functional Overview Support automatic STORE on power-down with a small 1 capacitor (except for CY14X256Q1A) The Cypress CY14X256Q combines a 256-Kbit nvSRAM with a nonvolatile element in each memory cell with serial SPI High reliability interface. The memory is organized as 32 K words of 8 bits each. Infinite read, write, and RECALL cycles The embedded nonvolatile elements incorporate the 1million STORE cycles to QuantumTrap QuantumTrap technology, creating the worlds most reliable Data retention: 20 years at 85 C nonvolatile memory. The SRAM provides infinite read and write 40 MHz and 104 MHz High speed serial peripheral interface cycles, while the QuantumTrap cells provide highly reliable (SPI) nonvolatile storage of data. Data transfers from SRAM to the 40 MHz clock rate SPI write and read with zero cycle delay nonvolatile elements (STORE operation) takes place 104 MHz clock rate SPI write and SPI read (with special fast automatically at power-down (except for CY14X256Q1A). On read instructions) power-up, data is restored to the SRAM from the nonvolatile Supports SPI mode 0 (0,0) and mode 3 (1,1) memory (RECALL operation). You can also initiate the STORE and RECALL operations through SPI instruction. SPI access to special functions Nonvolatile STORE/RECALL For a complete list of related documentation, click here. 8-byte serial number Configuration Manufacturer ID and Product ID Sleep mode Feature CY14X256Q1A CY14X256Q2A CY14X256Q3A Write protection AutoStore No Yes Yes Hardware protection using Write Protect (WP) pin Software Yes Yes Yes Software protection using Write Disable instruction STORE Software block protection for 1/4, 1/2, or entire array Hardware No No Yes Low power consumption STORE Average active current of 3 mA at 40 MHz operation Average standby mode current of 150 A Sleep mode current of 8 A Logic Block Diagram VCC VCAP Serial Number 8 x 8 Power Control Manufacturer ID / Block Product ID QuantumTrap 32 K x 8 SLEEP STORE SRAM RDSN/WRSN/RDID SI Memory 32 K x 8 RECALL READ/WRITE Data & CS SPI Control Logic Address STORE/RECALL/ASENB/ASDISB SCK Write Protection Control Instruction decoder WP SO WRSR/RDSR/WREN Status Register Note 1. This device will be referred to as nvSRAM throughout the document. Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 001-65282 Rev. *I Revised November 12, 2014 Not Recommended for New DesignsCY14C256Q CY14B256Q CY14E256Q Contents Pinouts ..............................................................................3 Special Instructions ....................................................... 16 Pin Definitions ..................................................................3 SLEEP Instruction ..................................................... 16 Device Operation ..............................................................4 Serial Number ................................................................. 16 SRAM Write .................................................................4 WRSN (Serial Number Write) Instruction .................. 16 SRAM Read ................................................................4 RDSN (Serial Number Read) Instruction ................... 17 STORE Operation .......................................................4 FAST RDSN AutoStore Operation ....................................................5 (Fast Serial Number Read) Instruction ............................. 17 Software STORE Operation ........................................5 Device ID ......................................................................... 18 Hardware STORE and HSB pin Operation .................5 RDID (Device ID Read) Instruction ...........................18 RECALL Operation ......................................................5 FAST RDID (Fast Device ID Read) Instruction ........ 19 Hardware RECALL (Power-Up) ..................................5 HOLD Pin Operation ................................................. 19 Software RECALL .......................................................5 Maximum Ratings ........................................................... 20 Disabling and Enabling AutoStore ...............................6 Operating Range ............................................................. 20 Serial Peripheral Interface ...............................................6 DC Electrical Characteristics ........................................ 20 SPI Overview ...............................................................6 Data Retention and Endurance ..................................... 21 SPI Modes ...................................................................7 Capacitance ....................................................................21 SPI Operating Features ....................................................8 Thermal Resistance ........................................................ 21 Power-Up ....................................................................8 AC Test Loads and Waveforms ..................................... 22 Power-Down ................................................................8 AC Test Conditions ........................................................ 22 Active Power and Standby Power Modes ...................8 AC Switching Characteristics ....................................... 23 SPI Functional Description ..............................................9 Switching Waveforms .................................................... 24 Status Register ...............................................................10 AutoStore or Power-Up RECALL .................................. 25 Read Status Register (RDSR) Instruction .................10 Switching Waveforms .................................................... 25 Fast Read Status Register Software Controlled STORE and RECALL Cycles ...... 26 (FAST RDSR) Instruction ................................................10 Switching Waveforms .................................................... 26 Write Status Register (WRSR) Instruction ................10 Hardware STORE Cycle ................................................. 27 Write Protection and Block Protection .........................12 Switching Waveforms .................................................... 27 Write Enable (WREN) Instruction ..............................12 Ordering Information ...................................................... 28 Write Disable (WRDI) Instruction ..............................12 Ordering Code Definitions ......................................... 28 Block Protection ........................................................12 Package Diagrams .......................................................... 29 Hardware Write Protection (WP) ...............................12 Acronyms ........................................................................31 Memory Access ..............................................................13 Document Conventions ................................................. 31 Read Sequence (READ) Instruction ..........................13 Units of Measure ....................................................... 31 Fast Read Sequence (FAST READ) Instruction ......13 Document History Page ................................................. 32 Write Sequence (WRITE) Instruction ........................13 Sales, Solutions, and Legal Information ...................... 33 nvSRAM Special Instructions ........................................15 Worldwide Sales and Design Support ....................... 33 Software STORE (STORE) Instruction .....................15 Products ....................................................................33 Software RECALL (RECALL) Instruction ..................15 PSoC Solutions ...................................................... 33 AutoStore Enable (ASENB) Instruction .....................15 Cypress Developer Community ................................. 33 AutoStore Disable (ASDISB) Instruction ...................15 Technical Support ..................................................... 33 Document Number: 001-65282 Rev. *I Page 2 of 33 Not Recommended for New Designs