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Cypress Semiconductor Electronic Components Datasheet

CY14B256KA Datasheet

256 Kbit (32K x 8) nvSRAM

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CY14B256KA pdf
CY14B256KA
256 Kbit (32K x 8) nvSRAM with
Real Time Clock
Features
256 Kbit nvSRAM
25 ns and 45 ns access times
Internally organized as 32K x 8 (CY14B256KA)
Hands off automatic STORE on power down with only a small
capacitor
STORE to QuantumTrap nonvolatile elements is initiated by
software, hardware, or AutoStore on power down
RECALL to SRAM initiated on power up or by software
High Reliability
Infinite Read, Write, and RECALL cycles
1 Million STORE cycles to QuantumTrap
20 year data retention
Real Time Clock
Full featured Real Time Clock
Watchdog timer
Clock alarm with programmable interrupts
Capacitor or battery backup for RTC
Backup current of 0.35 uA (Typ)
Industry Standard Configurations
Single 3V +20%, -10% operation
Industrial temperature
48-pin SSOP package
Pb-free and RoHS compliance
Functional Description
The Cypress CY14B256KA combines a 256 Kbit nonvolatile
static RAM with a full featured real time clock in a monolithic
integrated circuit. The embedded nonvolatile elements incor-
porate 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 periodic minutes, hours,
days, or months alarms. There is also a programmable watchdog
timer for process control.
Logic Block Diagram
A5
A6
A7
A8
A9
www.DataSheet4U.cAom11
A 12
A 13
A 14
DQ 0
DQ 1
DQ 2
DQ 3
DQ 4
DQ 5
DQ 6
DQ 7
QuantumTrap
512 X 512
STORE
STATIC RAM
ARRAY
512 X 512
RECALL
COLUMN IO
COLUMN DEC
A0 A1 A2 A3 A4 A10
VCC
VCAP
POWER
CONTROL
STORE/
RECALL
CONTROL
VRTCbat
VRTCcap
HSB
SOFTWARE
DETECT
-A14 A0
RTC
MUX
xout
xin
INT
-A14 A0
OE
CE
WE
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 001-55720 Rev. *A
• San Jose, CA 95134-1709 • 408-943-2600
Revised December 08, 2009
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Cypress Semiconductor Electronic Components Datasheet

CY14B256KA Datasheet

256 Kbit (32K x 8) nvSRAM

No Preview Available !

CY14B256KA pdf
CY14B256KA
Contents
Features ...............................................................................1
Functional Description .......................................................1
Contents ..............................................................................2
Pinouts ................................................................................3
Pin Definitions ....................................................................3
Device Operation ................................................................4
SRAM Read .........................................................................4
SRAM Write .........................................................................4
AutoStore Operation ..........................................................4
Hardware STORE (HSB) Operation ...................................5
Hardware RECALL (Power Up) ..........................................5
Software STORE .................................................................5
Software RECALL ...............................................................5
Preventing AutoStore .........................................................6
Best Practices .....................................................................7
Data Protection ...................................................................8
Noise Considerations .........................................................8
Real Time Clock Operation ................................................8
nvTIME Operation .........................................................8
Clock Operations ...........................................................8
Reading the Clock .........................................................8
Setting the Clock ...........................................................8
Backup Power ...............................................................8
Stopping and Starting the Oscillator ..............................9
Calibrating the Clock ..................................................... 9
Alarm ............................................................................. 9
Watchdog Timer ............................................................ 9
Power Monitor .............................................................10
Interrupts .....................................................................10
Flags Register .............................................................11
Maximum Ratings .............................................................16
Operating Range ...............................................................16
DC Electrical Characteristics ..........................................16
Capacitance ......................................................................17
Thermal Resistance ..........................................................17
AC Test Conditions ..........................................................17
RTC Characteristics .........................................................17
AC Switching Characteristics .........................................18
AutoStore/Power Up RECALL .........................................20
Software Controlled STORE/RECALL Cycle ..................21
Hardware STORE Cycle ...................................................22
Truth Table For SRAM Operations ..................................23
Ordering Information ........................................................24
Package Diagram ..............................................................25
Document History Page ...................................................26
Sales, Solutions, and Legal Information ........................26
Worldwide Sales and Design Support .........................26
Products ......................................................................26
www.DataSheet4U.com
Document #: 001-55720 Rev. *A
Page 2 of 26
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Part Number CY14B256KA
Description 256 Kbit (32K x 8) nvSRAM
Maker Cypress Semiconductor
Total Page 26 Pages
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