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Simtek
Simtek

STK17T88 Datasheet Preview

STK17T88 Datasheet

32K x 8 AutoStore nvSRAM

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STK17T88 pdf
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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
• Small Footprint SSOP Package (RoHS-Compli-
ant)
STK17T88
32K x 8 AutoStore nvSRAM
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
A5
A6
A7
A8
A9
A11
A12
A13
A14
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
Quantum Trap
512 X 512
STATIC RAM
ARRAY
512 X 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10
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
VCC
VCAP
POWER
CONTROL
STORE/
RECALL
CONTROL
VRTCbat
VRTCcap
HSB
SOFTWARE
DETECT
A13 – A0
RTC
X1
X2
INT
MUX
A14 – A0
G
E
W
Document Control #ML0024 Rev 1.7
March 2007



Simtek
Simtek

STK17T88 Datasheet Preview

STK17T88 Datasheet

32K x 8 AutoStore nvSRAM

No Preview Available !

STK17T88 pdf
STK17T88
Pin Configurations
VCAP
A14
A12
A7
A6
A5
INT
A4
VSS
VRTCbat
DQ0
A3
A2
A1
A0
DQ1
DQ2
X1
X2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
48 Pin SSOP
VCC
HSB
W
A13
A6
A9
A11
VSS
V RTCcap
DQ6
G
A10
E
DQ7
DQ5
DQ4
DQ3
VCC
For detailed package size
specifications, see page 25.
PIN DESCRIPTIONS
Pin Name
A14-A0
I/O
Input
DQ7-DQ0
E
W
I/O
Input
Input
G Input
X1
X2
VRTCcap
VRTCbat
VCC
HSB
Output
Input
Power Supply
Power Supply
Power Supply
I/O
INT
VCAP
VSS
(Blank)
Output
Power Supply
Power Supply
No Connect
Description
Address: The 15 address inputs select one of 32,768 bytes in the nvSRAM array or one of 16 bytes in the clock
register map
Data: Bi-directional 8-bit data bus for accessing the nvSRAM and RTC
Chip Enable: The active low E input selects the device
Write Enable: The active low W enables data on the DQ pins to be written to the address location selected on
the falling edge of E
Output Enable: The active low G input enables the data output buffers during read cycles. De-asserting G high
caused the DQ pins to tri-state.
Crystal Connection, drives crystal on startup
Crystal Connection for 32.768 kHz crystal
Capacitor supplied backup RTC supply voltage (Left unconnected if VRTCbat is used)
Battery supplied backup RTC supply voltage (Left unconnected if VRTCcap is used)
Power: 3.0V, +20%, -10%
Hardware Store Busy: When low this output indicates a Store is in progress. When pulled low external to the
chip, it will initiate a nonvolatile STORE operation. A weak pull up resistor keeps this pin high if not connected.
(Connection Optional).
Interrupt Control: Can be programmed to respond to the clock alarm, the watchdog timer and the power monitor.
Programmable to either active high (push/pull) or active low (open-drain)
AutoStore Capacitor: Supplies power to nvSRAM during power loss to store data from SRAM to nonvolatile stor-
age elements.
Ground
Unlabeled pins have no internal connections.
Document Control #ML0024 Rev 1.7
March 2007
2


Part Number STK17T88
Description 32K x 8 AutoStore nvSRAM
Maker Simtek
Total Page 28 Pages
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