Cypress AutoStore STK17TA8 Specification Sheet

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)
■
Logic Block Diagram
Cypress Semiconductor Corporation
Document #: 001-52039 Rev. **
A
5
A
6
A
7
A
8
STATIC RAM
A
9
ARRAY
A
12
1024 X 1024
A
13
A
14
A
15
A
16
DQ
0
COLUMN I/O
DQ
1
DQ
COLUMN DEC
2
DQ
3
DQ
4
DQ
A A A
5
0 1 2
DQ
6
DQ
7
• 198 Champion Court
128k X 8 AutoStore™ nvSRAM
with Real Time Clock
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.
V
CC
Quantum Trap
1024 X 1024
POWER
CONTROL
STORE
STORE/
RECALL
RECALL
CONTROL
A A A A
3 4 10 11
,
• San Jose CA 95134-1709
STK17TA8
V
CAP
V
RTCbat
V
RTCcap
HSB
SOFTWARE
A – A
15 0
DETECT
X
1
RTC X
2
INT
A – A
MUX
16 0
G
E
W
• 408-943-2600
Revised March 02, 2009
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