Specifications

Document Number: 001-06431 Rev. *G Revised May 05, 2008 Page 24 of 24
PSoC Designer™, Programmable System-on-Chip™, and PSoC Express™ are trademarks and PSoC® is a registered trademark of Cypress Semiconductor Corp. All other trademarks or registered
trademarks referenced herein are property of the respective corporations. Purchase of I
2
C components from Cypress or one of its sublicensed Associated Companies conveys a license under the
Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system conforms to the I
2
C Standard Specification as defined by Philips. AutoStore and QuantumTrap are
registered trademarks of Simtek Corporation. All products and company names mentioned in this document are the trademarks of their respective holders.
CY14B256K
© Cypress Semiconductor Corporation, 2006-2008. 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
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Document History Page
Document Title: CY14B256K, 256 Kbit (32K x 8) nvSRAM with Real Time Clock
Document Number: 001-06431
REV. ECN NO.
Issue
Date
Orig. of
Change
Description of Change
** 425138 See ECN TUP New data sheet
*A 437321 See ECN TUP Show data sheet on external Web
*B 471966 See ECN TUP Changed V
IH(min)
from 2.2V to 2.0V
Changed t
RECALL
from 60 μs to 100 μs
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
*C 503277 See ECN PCI 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 V
SWITCH(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
*D 597004 See ECN TUP Removed V
SWITCH(min)
specification from AutoStore/Power Up RECALL table
Changed t
GLAX
specification from 20 ns to 1 ns
Added t
DELAY(max)
specification of 70 μs in the Hardware STORE Cycle table
Removed t
HLBL
specification
Changed t
SS
specification from 70 μs(min) to 70 μs(max)
Changed V
CAP(max)
from 57 μF to 120 μF
*E 696097 See ECN VKN Added footnote 7 related to HSB
Added footnote 8 related to INT pin
Changed t
GLAX
to t
GHAX
Removed ABE bit from Interrupt register
*F 1349963 See ECN UHA/SFV Changed from Preliminary to Final
Added Note 5 regarding the W bit in the Flag register
Updated Ordering Information Table
*G 2483006 See ECN GVCH/PY
RS
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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