Please note that Cypress is an Infineon Technologies Company. The document following this cover page is marked as Cypress document as this is the company that originally developed the product. Please note that Infineon will continue to offer the product to new and existing customers as part of the Infineon product portfolio. Continuity of document content The fact that Infineon offers the following product as part of the Infineon product portfolio does not lead to any changes to this document. Future revisions will occur when appropriate, and any changes will be set out on the document history page. Continuity of ordering part numbers Infineon continues to support existing part numbers. Please continue to use the ordering part numbers listed in the datasheet for ordering. www.infineon.comCY14C256I CY14B256I CY14E256I 2 256-Kbit (32 K 8) Serial (I C) nvSRAM with Real Time Clock 256-Kbit (32 K 8) Serial (I2C) nvSRAM with Real Time Clock 2 I C access to special functions Features Nonvolatile STORE/RECALL 256-Kbit nonvolatile static random access memory (nvSRAM) 8-byte serial number Internally organized as 32 K 8 Manufacturer ID and Product ID STORE to QuantumTrap nonvolatile elements initiated Sleep mode 2 automatically on power-down (AutoStore) or by using I C Low power consumption command (Software STORE) or HSB pin (Hardware STORE) Average active current of 1 mA at 3.4 MHz operation RECALL to SRAM initiated on power-up (Power-Up Average standby mode current of 250 A 2 RECALL) or by I C command (Software RECALL) Sleep mode current of 8 A Automatic STORE on power-down with a small capacitor Industry standard configurations High reliability Operating voltages: Infinite read, write, and RECALL cycles CY14C256I: V = 2.4 V to 2.6 V CC 1 million STORE cycles to QuantumTrap CY14B256I: V = 2.7 V to 3.6 V CC Data retention: 20 years at 85 C CY14E256I: V = 4.5 V to 5.5 V CC Real Time Clock (RTC) Industrial temperature Full-featured RTC 16-pin small outline integrated circuit (SOIC) package Watchdog timer Restriction of hazardous substances (RoHS) compliant Clock alarm with programmable interrupts Backup power fail indication Overview Square wave output with programmable frequency (1 Hz, 512 Hz, 4096 Hz, 32.768 kHz) The Cypress CY14C256I/CY14B256I/CY14E256I combines a 2 256-Kbit nvSRAM with a full-featured RTC in a monolithic Capacitor or battery backup for RTC 2 integrated circuit with serial I C interface. The memory is Backup current of 0.45 A (typical) organized as 64K words of 8 bits each. The embedded 2 1 High-speed I C interface nonvolatile elements incorporate the QuantumTrap technology, Industry standard 100 kHz and 400 kHz speed creating the worlds most reliable nonvolatile memory. The Fast mode Plus 1 MHz speed SRAM provides infinite read and write cycles, while the High speed: 3.4 MHz QuantumTrap cells provide highly reliable nonvolatile storage of Zero cycle delay reads and writes data. Data transfers from SRAM to the nonvolatile elements (STORE operation) takes place automatically at power-down. Write protection On power-up, data is restored to the SRAM from the nonvolatile Hardware protection using Write Protect (WP) pin memory (RECALL operation). The STORE and RECALL Software block protection for one-quarter, one-half, or entire 2 operations can also be initiated by the user through I C array commands. For a complete list of related documentation, click here. Logic Block Diagram Serial Number 8 x 8 VCC VCAP VRTCcap V RTCbat Manufacturer ID / Product ID Power Control Memory Control Register Block Command Register QuantumTrap 32 K x 8 Sleep STORE SRAM Control Registers Slave SDA 2 Memory 32 K x 8 I C Control Logic RECALL SCL Memory Slave Slave Address Address and Data A2, A1, A0 RTC Slave Decoder Control WP X in RTC Control Logic INT/SQW Registers Counters X out Notes 2 1. The I C nvSRAM is a single solution which is usable for all four speed modes of operation. As a result, some I/O parameters are slightly different than those on chips which support only one mode of operation. Refer to AN87209 for more details. 2 2. Serial (I C) nvSRAM will be referred to as nvSRAM throughout the datasheet. Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 001-65230 Rev. *J Revised January 16, 2018