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Simtek

STK22C48 Datasheet Preview

STK22C48 Datasheet

2Kx8 AutoStore nvSRAM

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FEATURES
• 25, 45 ns Read Access & R/W Cycle Times
• Unlimited Read/Write Endurance
• Automatic Non-Volatile STORE on Power Loss
• Non-Volatile STORE Under Hardware Control
• Automatic RECALL to SRAM on Power Up
• Unlimited RECALL Cycles
• 1 Million STORE Cycles
• 100-Year Non-volatile Data Retention
• Single 5V + 10% Operation
• Commercial, Industrial, and Military
Temperatures
• 28-Pin 300 mil SOIC or 330 mil SOIC (RoHS-
Compliant)
STK22C48
2Kx8 AutoStore nvSRAM
DESCRIPTION
The Simtek STK22C48 is a 16Kb fast static RAM with
a nonvolatile 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 stor-
age 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 Simtek nvSRAM is the first monolithic non-vola-
tile memory to offer unlimited writes and reads. It is
the highest-performance, most reliable non-volatile
memory available.
BLOCK DIAGRAM
A5
A6
A7
A8
A9
VCCX VCAP
Quantum Trap
32 x 512
STATIC RAM
ARRAY
32 x 512
STORE
RECALL
POWER
CONTROL
STORE/
RECALL
CONTROL
HSB
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10
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 #ML0004 Rev 0.3
February 2007




Simtek

STK22C48 Datasheet Preview

STK22C48 Datasheet

2Kx8 AutoStore nvSRAM

No Preview Available !

STK22C48
PIN CONFIGURATIONS
VCAP
NC
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCCX
27 W
26 HSB
25 A8
24 A9
23 NC
22 G
21 A10
20 E
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
28-pin 300 mil SOIC
28-pin 330 mil SOIC
PIN NAMES
Pin Name
A10-A0
DQ7-DQ0
E
W
Input
I/O
Input
Input
I/O
G Input
VCC Power Supply
VSS Power Supply
Description
Address: The 11 address inputs select one of 2,048 bytes in the nvSRAM array
Data: Bi-directional 8-bit data bus for accessing the nvSRAM
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 latched by 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.
Power: 5.0V, ±10%
Ground
Document Control #ML0004 Rev 0.3
February 2007
2


Part Number STK22C48
Description 2Kx8 AutoStore nvSRAM
Maker Simtek
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