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STK12C68-K25IM PDF预览

STK12C68-K25IM

更新时间: 2024-10-27 23:35:07
品牌 Logo 应用领域
其他 - ETC 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数 文件大小 规格书
10页 65K
描述
NVRAM (EEPROM Based)

STK12C68-K25IM 数据手册

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STK12C68-IM  
CMOS nvSRAM  
8K x 8 AutoStore™  
Nonvolatile Static RAM  
Industrial Temperature/Military Screen  
DESCRIPTION  
FEATURES  
• Industrial Temperature with Military Screening  
• 25, 35 and 45ns Access Times  
The Simtek STK12C68-IM is a fast static RAM (25, 35  
and 45ns), with a nonvolatile EEPROM element incor-  
porated in each static memory cell. The SRAM can be  
read and written an unlimited number of times, while  
independentnonvolatiledataresidesinEEPROM. Data  
transfers from the SRAM to the EEPROM (the STORE  
operation) take place automatically upon power down  
using charge stored in an external 100 µF capacitor.  
Transfers from the EEPROM to the SRAM (the RECALL  
operation) take place automatically on power up. Soft-  
ware sequences may also be used to initiate both  
STORE and RECALL operations. A STORE can also be  
initiated via a single pin.  
• 15 mA I at 200ns Access Speed  
CC  
• Automatic STORE to EEPROM on Power Down  
• Hardware or Software initiated STORE to  
EEPROM  
• Automatic STORE Timing  
• 100,000 STORE cycles to EEPROM  
• 10 year data retention in EEPROM  
• Automatic RECALL on Power Up  
• Software initiated RECALL from EEPROM  
• Unlimited RECALL cycles from EEPROM  
• Single 5V±10% Operation  
The STK12C68-IM is available in the following  
packages: a 28-pin 300 mil ceramic DIP and a 28-pad  
LCC. MIL-STD-883 and Standard Military Drawing  
(SMD 5962-94599) devices are also available.  
• Commercial and Industrial Temperatures  
• Available in multiple standard packages  
PIN CONFIGURATIONS  
LOGIC BLOCK DIAGRAM  
1
VCAP  
28  
VCCX  
2
3
27  
26  
W
A12  
A 7  
A 6  
A 5  
A 4  
A 3  
HSB  
A 8  
A 9  
A11  
G
EEPROM ARRAY  
256 x 256  
25  
24  
4
5
3
2
28 27  
26  
1
4
5
A 6  
A 5  
HSB  
A 8  
23  
22  
6
7
A3  
25  
24  
23  
22  
21  
6
A 4  
A 3  
A2  
A1  
A 9  
A11  
G
STORE  
A4  
8
9
7
21  
20  
A 2  
A 1  
A 0  
A 10  
8
TOP VIEW  
A5  
E
DQ 7  
RECALL  
STATIC RAM  
9
A10  
10  
11  
19  
18  
10  
20  
19  
18  
A6  
A0  
DQ0  
DQ1  
E
DQ  
DQ 6  
DQ 5  
ARRAY  
0
11  
12  
DQ7  
DQ6  
17  
16  
15  
12  
13  
14  
DQ  
1
A7  
A 0  
A12  
256 x 256  
13 14 15 16 17  
DQ  
DQ  
4
2
A8  
A9  
A
VSS  
DQ 3  
HSB  
STORE/  
RECALL  
CONTROL  
28 - LCC  
28 - 300 CDIP  
12  
DQ0  
DQ1  
DQ2  
DQ3  
PIN NAMES  
COLUMN I/O  
A
- A  
Address Inputs  
Write Enable  
Data In/Out  
Chip Enable  
Output Enable  
Power (+5V)  
Ground  
0
12  
COLUMN DECODER  
W
DQ - DQ  
0
7
DQ4  
DQ5  
DQ6  
DQ7  
E
A0  
A1  
A2  
A
A11  
10  
G
E
G
V
CCX  
V
SS  
V
Capacitor  
CAP  
W
HSB  
Hardware Store/Busy  
41  

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