STK17TA8 Datasheet, PDF (1/23 Pages) List of Unclassifed Manufacturers – nvTime™ Event Data Recorder 128K x 8 AutoStore™ nvSRAM with Real-Time Clock Product Preview

STK17TA8
128k X 8 AutoStore™ nvSRAM
with Real Time Clock
Features
■ nvSRAM Combined with Integrated Real Time Clock Functions
(RTC, Watchdog Timer, Clock Alarm, Power Monitor)
■ Capacitor or Battery Backup for RTC
■ 25, 45 ns Read Access and Read/Write Cycle Time
■ Unlimited Read/Write Endurance
■ Automatic nonvolatile STORE on Power Loss
■ Nonvolatile STORE Under Hardware or Software Control
■ Automatic RECALL to SRAM on Power Up
■ Unlimited RECALL Cycles
■ 200K STORE Cycles
■ 20-Year nonvolatile Data Retention
■ Single 3 V +20%, -10% Power Supply
■ Commercial and Industrial Temperatures
■ 48-pin 300-mil SSOP Package (RoHS-Compliant)
Description
The Cypress STK17TA8 combines a 1 Mb nonvolatile static RAM
(nvSRAM) with a full featured real time clock in a reliable,
monolithic integrated circuit.
The 1 Mb nvSRAM is a fast static RAM with a nonvolatile
Quantum Trap storage element included with each memory cell.
The SRAM provides the fast access and cycle times, ease of use
and unlimited read and write endurance of a normal SRAM. Data
transfers automatically to the nonvolatile storage cells when
power loss is detected (the STORE operation). On power up,
data is automatically restored to the SRAM (the RECALL
operation). Both STORE and RECALL operations are also
available under software control.
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 one-time alarms or periodic
minutes, hours, or days alarms. There is also a programmable
watchdog timer for processor control.
Logic Block Diagram
A₅
A6
A₇
A8
A₉
A12
A₁₃
A14
A₁₅
A16
DQ₀
DQ₁
DQ₂
DQ₃
DQ₄
DQ₅
DQ₆
DQ₇
Quantum Trap
1024 X 1024
STATIC RAM
ARRAY
1024 X 1024
STORE
RECALL
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10 A11
V_CC
V_CAP
POWER
CONTROL
STORE/
RECALL
CONTROL
V_RTCbat
V_RTCcap
HSB
SOFTWARE
DETECT
A₁₅ – A₀
RTC
MUX
X₁
X2
INT
A₁₆ – A₀
G
E
W
Cypress Semiconductor Corporation • 198 Champion Court
Document #: 001-52039 Rev. **
• San Jose, CA 95134-1709 • 408-943-2600
Revised March 02, 2009
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