32K 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 & R/W Cycle Time
• Unlimited Read/Write Endurance
• Automatic Non-volatile STORE on Power Loss
• Non-Volatile STORE Under Hardware or Soft-
ware 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)
STK17T88
DESCRIPTION
The Simtek STK17T88 combines a 256Kb non-vola-
tile static RAM (nvSRAM) with a full-featured real-
time clock in a reliable, monolithic integrated circuit.
The 256Kbit 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
512 X 512
A
5
A
6
A
7
A
8
A
9
A
11
A
12
A
13
A
14
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
V
CC
V
CAP
V
RTCbat
V
RTCcap
ROW DECODER
STORE
STATIC RAM
ARRAY
512 X 512
RECALL
POWER
CONTROL
STORE/
RECALL
CONTROL
HSB
SOFTWARE
DETECT
A
13
– A
0
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
RTC
X
1
X
2
INT
A
14
– A
0
G
E
W
A
0
A
1
A
2
A
3
A
4
A
10
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 #ML0024 Rev 2.0
Jan, 2008
SIMTEK [ SIMTEK CORPORATION ]
