Cypress CY14B256K - Manuals

Cypress CY14B256K – Manual in PDF format online.

Manuals:

Manual

Manual Cypress CY14B256K

Summary

Page 2 - Top View

CY14B256K Document Number: 001-06431 Rev. *H Page 2 of 28 Pin Configurations Figure 1. 48-Pin SSOP Pin Definitions Pin Name Alt IO Type Description A 0 –A 14 Input Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM. DQ0-DQ7 Input or Output Bidirectional Data IO lines . Used as inpu...

Page 3 - Device Operation; SRAM READ; Figure 2. AutoStore Mode

CY14B256K Document Number: 001-06431 Rev. *H Page 3 of 28 Device Operation The CY14B256K nvSRAM consists of two functionalcomponents paired in the same physical cell. The componentsare SRAM memory cell and a nonvolatile QuantumTrap cell. TheSRAM memory cell operates as a standard fast static RAM. Da...

Page 5 - Low Average Active Power; Figure 3; Best Practices; Stopping and Starting the Oscillator; Figure 3. Current versus Cycle Time

CY14B256K Document Number: 001-06431 Rev. *H Page 5 of 28 Low Average Active Power CMOS technology provides the CY14B256K the benefit ofdrawing significantly less current when it is cycled at times longerthan 50 ns. Figure 3 shows the relationship between I CC and READ and/or WRITE cycle time. Worst...

Page 7 - Real Time Clock Operation; Register Map Detail; Table 2. RTC Backup Time

CY14B256K Document Number: 001-06431 Rev. *H Page 7 of 28 Real Time Clock Operation nvTIME Operation The CY14B256K consists of internal registers that contain clock,alarm, watchdog, interrupt, and control functions. RTC registersuse the last 16 address locations of the SRAM . Internal double bufferi...

Page 8 - Calibrating the Clock; Alarm; Note; Watchdog Timer; Figure 4

CY14B256K Document Number: 001-06431 Rev. *H Page 8 of 28 Calibrating the Clock The RTC is driven by a quartz controlled oscillator with a nominalfrequency of 32.768 kHz. Clock accuracy depends on the qualityof the crystal and calibration. The crystal oscillators typicallyhave an error of +20ppm to ...

Page 9 - Power Monitor; “AutoStore® Operation”; Interrupts; Watchdog Interrupt Enable - WIE; Flags Register; “Stopping and Starting the Oscillator”; Figure 4. Watchdog Timer Block Diagram

CY14B256K Document Number: 001-06431 Rev. *H Page 9 of 28 Power Monitor The CY14B256K provides a power management scheme withpower fail interrupt capability. It also controls the internal switchto backup power for the clock and protects the memory from lowV CC access. The power monitor is based on a...

Page 10 - WDF - Watchdog Timer Flag

CY14B256K Document Number: 001-06431 Rev. *H Page 10 of 28 Figure 5. Interrupt Block Diagram Figure 6. RTC Recommended Component Configuration WDF - Watchdog Timer Flag WIE - Watchdog Interrupt PF - Power Fail Flag PFE - Power Fail Enable AF - Alarm Flag AIE - Alarm Interrupt EnableP/L - Pulse Level...

Page 13 - WatchDog Timer; “Watchdog; Interrupt Status/Control

CY14B256K Document Number: 001-06431 Rev. *H Page 13 of 28 0X7FF8 Calibration/Control D7 D6 D5 D4 D3 D2 D1 D0 OSCEN 0 Calibration Sign Calibration OSCEN Oscillator Enable. When set to 1, the oscillator is stopped. When set to 0, the oscillator runs. Disabling the oscillator saves battery or capacito...

Page 14 - Table 4. Register Map Detail

CY14B256K Document Number: 001-06431 Rev. *H Page 14 of 28 0x7FF4 Alarm - Hours D7 D6 D5 D4 D3 D2 D1 D0 M 10s Alarm Hours Alarm Hours Contains the alarm value for the hours and the mask bit to select or deselect the hours value. M Match. When this bit is set to 0, the hours value is used in the alar...

Page 15 - DC Electrical Characteristics

CY14B256K Document Number: 001-06431 Rev. *H Page 15 of 28 Maximum Ratings Exceeding maximum ratings may impair the useful life of thedevice. These user guidelines are not tested. Storage Temperature ................................. –65 ° C to +150 ° C Ambient Temperature withPower Applied ...........

Page 16 - Thermal Resistance; AC Test Conditions

CY14B256K Document Number: 001-06431 Rev. *H Page 16 of 28 Data Retention and Endurance Parameter Description Min Unit DATA R Data Retention 20 Years NV C Nonvolatile STORE Operations 200 K Capacitance These parameters are guaranteed but not tested. Parameter Description Test Conditions Max Unit C I...

Page 17 - AC Switching Characteristics

CY14B256K Document Number: 001-06431 Rev. *H Page 17 of 28 AC Switching Characteristics Parameter Description 25 ns 35 ns 45 ns Unit Min Max Min Max Min Max Cypress Parameter Alt. Parameter SRAM Read Cycle t ACE t ELQV Chip Enable Access Time 25 35 45 ns t RC [10] t AVAV, t ELEH Read Cycle Time 25 3...

Page 19 - AutoStore or Power Up RECALL; Parameter

CY14B256K Document Number: 001-06431 Rev. *H Page 19 of 28 AutoStore or Power Up RECALL Parameter Description CY14B256K Unit Min Max t HRECALL [17] Power Up RECALL Duration 40 ms t STORE [18, 19] STORE Cycle Duration Commercial 12.5 ms Industrial 15 ms V SWITCH Low Voltage Trigger Level 2.65 V t VCC...

Page 20 - Software Controlled STORE/RECALL Cycles

CY14B256K Document Number: 001-06431 Rev. *H Page 20 of 28 Software Controlled STORE/RECALL Cycles [20, 21] Parameter Alt. Parameter Description 25 ns 35 ns 45 ns Unit Min Max Min Max Min Max t RC t AVAV STORE/RECALL Initiation Cycle Time 25 35 45 ns t SA t AVEL Address Setup Time 0 0 0 ns t CW t EL...

Page 21 - Hardware STORE Cycle; Time Allowed to Complete SRAM Cycle; Hardware STORE Pulse Width; Soft Sequence Commands; Soft Sequence Processing Time

CY14B256K Document Number: 001-06431 Rev. *H Page 21 of 28 Hardware STORE Cycle Parameter Alt. Parameter Description CY14B256K Unit Min Max t DELAY [22] Time Allowed to Complete SRAM Cycle 1 70 μ s t PHSB t HLHX Hardware STORE Pulse Width 15 ns Figure 15. Hardware STORE Cycle Soft Sequence Commands ...

Page 22 - RTC Characteristics; Truth Table For SRAM Operations

CY14B256K Document Number: 001-06431 Rev. *H Page 22 of 28 RTC Characteristics Parameter Description Test Conditions Min Max Unit I BAK [25] RTC Backup Current Commercial 300 nA Industrial 350 nA V RTCbat [26] RTC Battery Pin Voltage 1.8 3.3 V V RTCcap [27] RTC Capacitor Pin Voltage 1.2 2.7 V tOCS R...

Page 23 - Part Numbering Nomenclature; Cypress

CY14B256K Document Number: 001-06431 Rev. *H Page 23 of 28 Part Numbering Nomenclature CY 14 B 256 K - SP 25 X C T Option:T-Tape and ReelBlank - Std. Speed:25 - 25 ns 45 - 45 ns Data Bus:K - x8 + RTC Density: 256 - 256 Kb Voltage: B - 3.0V Cypress nvSRAM 14 - AutoStore + Software Store + Hardware St...

Page 24 - Ordering Information

CY14B256K Document Number: 001-06431 Rev. *H Page 24 of 28 Ordering Information All the below mentioned parts are Pb-free. Contact your local Cypress sales representative for availability of these parts. Speed (ns) Ordering Code Package Diagram Package Type Operating Range 25 CY14B256K-SP25XC 51-850...

Page 25 - Package Diagrams

CY14B256K Document Number: 001-06431 Rev. *H Page 25 of 28 Package Diagrams Figure 17. 48-Pin Shrunk Small Outline Package (51-85061) 51-85061-*C [+] Feedback

Page 26 - Document History Page; ECN

CY14B256K Document Number: 001-06431 Rev. *H Page 26 of 28 Document History Page Document Title: CY14B256K 256 Kbit (32K x 8) nvSRAM with Real Time ClockDocument Number: 001-06431 Rev. ECN Orig. of Change Submission Date Description of Change ** 425138 TUP See ECN New data sheet *A 437321 TUP See EC...