CY14B256KA Datasheet, PDF (1/26 Pages) Cypress Semiconductor – 256 Kbit (32K x 8) nvSRAM with Real Time Clock

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
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
V_CC
V_CAP
POWER
CONTROL
STORE/
RECALL
CONTROL
V_RTCbat
V_RTCcap
HSB
SOFTWARE
DETECT
- A₁₄ A₀
RTC
MUX
x_out
x_in
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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