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)
STK17TA8
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
Quantum Trap
1024 X 1024
ROW DECODER
STORE
STATIC RAM
ARRAY
1024 X 1024
RECALL
V
CC
V
CAP
V
RTCbat
V
RTCcap
A
5
A
6
A
7
A
8
A
9
A
12
A
13
A
14
A
15
A
16
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
POWER
CONTROL
STORE/
RECALL
CONTROL
HSB
SOFTWARE
DETECT
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
RTC
A
15
– A
0
X
1
X
2
INT
A
16
– A
0
G
E
W
A
0
A
1
A
2
A
3
A
4
A
10
A
11
MUX
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
SIMTEK [ SIMTEK CORPORATION ]
