Document Number: 001-55720 Rev. *H Page 27 of 28
Document History Page
Document Title: CY14B256KA, 256-Kbit (32 K × 8) nvSRAM with Real Time Clock
Document Number: 001-55720
Rev. ECN No.
Orig. of
Change
Submission
Date
Description of Change
** 2763469 GVCH 09/14/09 New data sheet.
*A 2829117 GVCH 12/16/09 Added data retention and endurance table
Updated STORE cycles to QuantumTrap from 200K to 1 Million
Updated I
BAK
RTC backup current spec unit from nA to A
Added Contents. Moved to external web
*B 2922858 GVCH 04/26/10 Pin Definitions: Added more clarity on HSB
pin operation
Hardware STORE (HSB) Operation: Added more clarity on HSB
pin operation
Updated HSB
pin operation in Figure 12 and updated footnote 34.
Updated package diagram.
*C 3143855 GVCH 01/17/2011 Updated Setting the Clock description
Added footnote 7
Updated ‘W’ bit description in Register Map Detail table
Updated Maximum Ratings
Added t
RTCp
parameter to RTC Characteristics table
Figure 11: Typo error fixed
Added Acronyms table and Units of Measure table
*D 3315247 GVCH 07/15/2011 Updated DC Electrical Characteristics (Added Note 12 and referred the same
note in V
CAP
parameter).
Updated Capacitance (Included Input capacitance (for HSB
) and Output
capacitance (for HSB
)).
Updated AC Switching Characteristics (Added Note 18 and referred the same
note in Parameters).
*E 3587664 GVCH 04/16/2012 Updated Pin Definitions (Added Note 2 and referred the same note in V
RTCcap
,
V
RTCbat
, Xout, Xin, INT pins).
Added Note 5 and referred the same note in Figure .
Updated Package Diagram.
*F 3660966 GVCH 06/29/2012 Updated DC Electrical Characteristics (Added V
VCAP
parameter and its details,
added Note 13 and referred the same note in V
VCAP
parameter, also referred
Note 14 in V
VCAP
parameter).
*G 3759143 GVCH 09/28/2012 Updated Real Time Clock Operation (description).
Updated Maximum Ratings (Removed “Ambient temperature with power
applied” and included “Maximum junction temperature”).
Updated Package Diagram (spec 51-85061 (Changed revision from *E to *F)).
*H 4048849 GVCH 07/03/2013 Updated Pin Definitions:
Updated HSB
pin description (Added more clarity).
Updated Device Operation:
Updated AutoStore Operation (Removed sentence “The HSB
signal is
monitored by the system to detect if an AutoStore cycle is in progress.”).
Updated Real Time Clock Operation:
Updated Backup Power (Added Note).
Added RTC External Components.
Moved Figure 5 from Flags Register section to RTC External Components
section.
Added PCB Design Considerations for RTC.
Updated in new template.
(24 Seiten)
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