CY14B256KA-SP45XI 查看數據表（PDF） - Cypress Semiconductor
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CY14B256KA-SP45XI Datasheet PDF : 27 Pages
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CY14B256KA
256-Kbit (32 K × 8) nvSRAM with
Real Time Clock
Features 256-Kbit (32 K × 8) nvSRAM with Real Time Clock
■ 256-Kbit nonvolatile static random access memory (nvSRAM)
❐ 25 ns and 45 ns access times
❐ Internally organized as 32 K × 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 (RTC)
❐ Full-featured real time clock
❐ Watchdog timer
❐ Clock alarm with programmable interrupts
❐ Capacitor or battery backup for RTC
❐ Backup current of 0.35 µA (Typ)
■ Industry standard configurations
❐ Single 3 V +20%, –10% operation
❐ Industrial temperature
❐ 48-pin shrink small-outline package (SSOP)
❐ Pb-free and Restriction of hazardous substances (RoHS)
compliant
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
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 periodic minutes, hours,
days, or months alarms. There is also a programmable watchdog
timer for process control.
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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
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 Number: 001-55720 Rev. *G
• San Jose, CA 95134-1709 • 408-943-2600
Revised September 28, 2012
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