CY14B256K-SP45XCT

CY14B256K-SP45XCT Datasheet


CY14B256K

Part Datasheet
CY14B256K-SP45XCT CY14B256K-SP45XCT CY14B256K-SP45XCT (pdf)
Related Parts Information
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CY14B256K-SP45XC CY14B256K-SP45XC CY14B256K-SP45XC
PDF Datasheet Preview
CY14B256K
256 Kbit 32K x 8 nvSRAM with Real Time Clock
• 25 ns, 35 ns, and 45 ns access times
• Pin compatible with STK17T88
• Data integrity of Cypress nvSRAM combined with full featured Real Time Clock Low power, 350 nA RTC current Capacitor or battery backup for RTC
• Watchdog timer
• Clock alarm with programmable interrupts
• Hands off automatic STORE on power down with only a small capacitor
• STORE to QuantumTrap initiated by software, device pin, or on power down
• RECALL to SRAM initiated by software or on power up
• Infinite READ, WRITE, and RECALL cycles
• High reliability Endurance to 200K cycles Data retention 20 years at 55°C
• Single 3V operation with tolerance of +20%, -10%
• Commercial and industrial temperature
• 48-Pin SSOP ROHS compliant

Functional Description

The Cypress CY14B256K combines a 256 Kbit nonvolatile static RAM with a full-featured real time clock in a monolithic integrated circuit. The embedded nonvolatile elements incorporate QuantumTrap technology producing the world’s most reliable nonvolatile memory. The SRAM is read and written an infinite number of times, while independent, nonvolatile data resides in the nonvolatile elements.

The real time clock function provides an accurate clock with leap year tracking and a programmable high accuracy oscillator. The alarm function is programmable for one time alarms or periodic seconds, minutes, hours, or days. There is also a programmable watchdog timer for process control.

Logic Block Diagram

A5 A6 A7 A8 A9 A 11 A 12 A 13 A 14

DQ 0 DQ 1 DQ 2 DQ 3 DQ 4 DQ 5 DQ 6 DQ 7

INPUT BUFFERS

ROW DECODER

QuantumTrap 512 X 512

STORE

STATIC RAM ARRAY 512 X 512

RECALL

COLUMN IO COLUMN DEC

A0 A1 A2 A3 A4 A10

VCAP

POWER CONTROL

STORE/ RECALL CONTROL

VRTCbat VRTCcap

SOFTWARE DETECT
- A13 A0

RTC MUX
x1 x2
- A14 A0

CE WE
• San Jose, CA 95134-1709
• 408-943-2600
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Ordering Information

All the below mentioned parts are Pb-free. Contact your local Cypress sales representative for availability of these parts.

Speed ns 25
Ordering Code CY14B256K-SP25XC CY14B256K-SP25XCT CY14B256K-SP25XI CY14B256K-SP25XIT CY14B256K-SP35XC CY14B256K-SP35XCT CY14B256K-SP35XI

Package Diagram
51-85061

Package Type 48-pin SSOP
51-85061 48-pin SSOP
51-85061 48-pin SSOP
51-85061 48-pin SSOP

Operating Range

Commercial

Industrial

Commercial

Industrial

CY14B256K-SP35XIT

CY14B256K-SP45XC

CY14B256K-SP45XCT

CY14B256K-SP45XI

CY14B256K-SP45XIT
51-85061 48-pin SSOP 51-85061 48-pin SSOP

Commercial Industrial

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Package Diagrams

Figure 48-Pin Shrunk Small Outline Package 51-85061

CY14B256K
51-85061-*C

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CY14B256K

Document History Page

Document Title CY14B256K 256 Kbit 32K x 8 nvSRAM with Real Time Clock Document Number 001-06431

Orig. of Change

Submission Date

Description of Change
425138

See ECN New data sheet
437321

See ECN Show data sheet on external Web
471966

See ECN
Changed VIH min from 2.2V to 2.0V Changed tRECALL from 60 us to 100 us Changed Endurance from one million cycles to 500K cycles Changed Data Retention from 100 years to 20 years Added Soft Sequence Processing Time Waveform Updated Part Numbering Nomenclature and Ordering Information Added RTC Characteristics Table Added RTC Recommended Component Configuration
503277

See ECN
Changed from “Advance” to “Preliminary” Changed the term “Unlimited” to “Infinite” Changed endurance from 500K cycles to 200K cycles Device operation Tolerance limit changed from +20% to +15% in the Features Section and Operating Range Table Removed Icc1 values from the DC table for 25 ns and 35 ns industrial grade Changed VSWITCH min from 2.55V to 2.45V Added temperature specifications to data retention - 20 years at 55°C Updated Part Nomenclature Table and Ordering Information Table
597004
696097

See ECN See ECN

Removed VSWITCH min specification from AutoStore/Power Up RECALL table Changed tGLAX specification from 20 ns to 1 ns Added tDELAY max specification of 70 us in the Hardware STORE Cycle table Removed tHLBL specification Changed tSS specification from 70 us min to 70 us max Changed VCAP max from 57 uF to 120 uF

Added footnote 7 related to HSB Added footnote 8 related to INT pin Changed tGLAX to tGHAX Removed ABE bit from Interrupt register
1349963

UHA/SFV

See ECN
Changed from Preliminary to Final Added Note 5 regarding the W bit in the Flag register Updated Ordering Information Table
2483006

GVCH/PYRS
05/05/08

Changed tolerance from +15%, -10% to +20%, -10% Changed Operating voltage range from 2.7V-3.45V to 2.7V-3.6V

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CY14B256K

Document Title CY14B256K 256 Kbit 32K x 8 nvSRAM with Real Time Clock Document Number 001-06431

Orig. of Change

Submission Date

Description of Change
2663934

GVCH/PYRS
02/24/09

Updated Features section Updated pin definition of WE pin Updated “Reading the clock”, “Backup Power”, “Stopping and starting the Oscillator” and “Alarm” descriptions under RTC operation Modified “Figure RTC Recommended Component Configuration” Added footnote 4 Added footnote 6 Added default values to RTC Register Map” table Updated flag register description in Register Map Detail” table Added Industrial specs for 25ns and 35ns speed Changed VIH from vcc+0.3 to Vcc+0.5 Added “Data Retention and Endurance” table on page 15 Added thermal resistance values Added alternate parameters in the AC switching characteristics table Renamed tOH to tOHA Changed tHRECALL from 20 to 40ms Changed tRECALL spec from 100us to 170us Including tss of 70us Renamed tAS to tSA Renamed tGHAX to tHA Renamed tHLHX to tPHSB Updated Figure 16 Added truth table for SRAM operations

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CY14B256K

Sales, Solutions, and Legal Information

Worldwide Sales and Design Support

Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at cypress.com/sales.

Products PSoC Clocks & Buffers Wireless Memories Image Sensors
psoc.cypress.com clocks.cypress.com wireless.cypress.com memory.cypress.com image.cypress.com

PSoC Solutions

General
psoc.cypress.com/solutions

Low Power/Low Voltage
psoc.cypress.com/low-power

Precision Analog
psoc.cypress.com/precision-analog

LCD Drive
psoc.cypress.com/lcd-drive

CAN 2.0b
psoc.cypress.com/can
psoc.cypress.com/usb

Cypress Semiconductor Corporation, The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Any Source Code software and/or firmware is owned by Cypress Semiconductor Corporation Cypress and is protected by and subject to worldwide patent protection United States and foreign , United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without the express written permission of Cypress.

Disclaimer CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Use may be limited by and subject to the applicable Cypress software license agreement.

All products and company names mentioned in this document are the trademarks of their respective holders.

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More datasheets: ADJD-WM21-NKKZ0 | ADJD-WM01-NKKZ0 | ADJD-WM00-NKKZ0 | ADJD-YM00-NJJZ0 | M1452 WH002 | M1452 WH005 | M1452 WH001 | CY14B256K-SP25XC | CY14B256K-SP35XI | CY14B256K-SP35XIT


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Datasheet ID: CY14B256K-SP45XCT 507658