STK17TA8_08 Datasheet, PDF (1/29 Pages) Simtek Corporation – 128Kx8 Autostore nvSRAM With Real-Time Clock

STK17TA8
128Kx8 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 & R/W Cycle Time
• Unlimited Read/Write Endurance
• Automatic Non-volatile STORE on Power Loss
• Non-Volatile STORE Under Hardware or Software
Control
• Automatic RECALL to SRAM on Power Up
• Unlimited RECALL Cycles
• 200K STORE Cycles
• 20-Year Non-volatile Data Retention
• Single 3 V +20%, -10% Power Supply
• Commercial and Industrial Temperatures
• 48-pin 300-mil SSOP Package (RoHS-Compliant)
DESCRIPTION
The Simtek STK17TA8 combines a 1Mb non-volatile
static RAM (nvSRAM) with a full-featured real-time
clock in a reliable, monolithic integrated circuit.
The 1Mbit nvSRAM is a fast static RAM with a non-
volatile Quantum Trap storage element included
with each memory cell.
The SRAM provides the fast access & cycle times,
ease of use and unlimited read & write endurance of
a normal SRAM. Data transfers automatically to the
non-volatile 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 pro-
grammable for one-time alarms or periodic minutes,
hours, or days alarms. There is also a programma-
ble watchdog timer for processor control.
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
VCC
VCAP
POWER
CONTROL
STORE/
RECALL
CONTROL
V_RTCbat
V_RTCcap
HSB
SOFTWARE
DETECT
A₁₅ – A₀
RTC
MUX
X₁
X2
INT
A16 – A0
G
E
W
This product conforms to specifications per the
terms of Simtek standard warranty. The product
has completed Simtek internal qualification testing
and has reached production status.
1
Document Control #ML0025 Rev 2.0
Jan, 2008