STK18TA8 Datasheet, PDF (1/28 Pages) List of Unclassifed Manufacturers – nvTime Event Data Recorder Serial Peripheral Interface nvSRAM QuantumTrap CMOS Nonvolatile Static RAM

STK18TA8
nvTime^TM Event Data Recorder
Serial Peripheral Interface nvSRAM
QuantumTrap^TM CMOS
Nonvolatile Static RAM
FEATURES
• Data integrity of Simtek nvSRAM Combined
with Full-Featured Real-Time Clock
• 40 MHZ SPI interface with compatible
commands to industry standards 1 Mbit SPI
EEPROMs
• STORE to QuantumTrap™ Nonvolatile
Elements is Initiated by Software , device pin
or AutoStore™ on Power Down
• RECALL to SRAM Initiated by Software or
Power Restore
• Unlimited READ and WRITE and RECALL
Cycles
• Watchdog Timer
• Clock Alarm with programmable Interrupts
• Capacitor or battery backup for RTC
• Single 3V +20%, -10% Operation
• Commercial and Industrial Temperatures
• High-reliability
o Endurance to 1 Million Cycles
o Retention to 100 years at 85 ºC
• Package: 48-Pin SSOP
BLOCK DIAGRAM
Quantum Trap
1024 X 1024
STORE
DESCRIPTION
Preliminary
The Simtek STK18TA8 combines a 1 Mbit nonvolatile
static RAM and a full-featured real-time clock, in a
reliable, monolithic integrated circuit. A Serial
Peripheral Interface (SPI) makes system integration
simple. The embedded nonvolatile elements
incorporate Simtek’s QuantumTrap^TM technology
producing the world’s most reliable nonvolatile
memory. The SRAM provides unlimited read and write
cycles, while independent, nonvolatile data resides in
the highly reliable QuantumTrap^TM cell. Data transfers
from the SRAM to the nonvolatile elements (the
STORE operation) takes place automatically at power
down. On power up, data is restored to the SRAM (the
RECALL operation) from the nonvolatile memory.
Both the 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
seconds, minutes, hours, or days. There is also a
programmable Watchdog Timer for process control.
V_CC
V_CAP
POWER
CONTROL
V_RTCbat
V_RTCcap
STATIC RAM
ARRAY
1024 X 1024
RECALL
STORE/
RECALL
CONTROL
HSB
COLUMN I/O
COLUMN DEC
Data
SPI
CONTROLLER
Address
RTC
Figure 1. Block Diagram
SCK
SI
SO
HOLD
CS
X₁
X₂
INT
April 2005
1
Document Control #ML0028 rev 0.8