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93C465AT-E/MC 参数 Datasheet PDF下载

93C465AT-E/MC图片预览
型号: 93C465AT-E/MC
PDF下载: 下载PDF文件 查看货源
内容描述: 1K - 16K与Microwire兼容串行EEPROM [1K-16K Microwire Compatible Serial EEPROMs]
分类和应用: 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
文件页数/大小: 38 页 / 703 K
品牌: MICROCHIP [ MICROCHIP ]
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93XX46X/56X/66X/76X/86X  
4.5  
Organization (ORG)  
4.6  
Program Enable (PE)  
When the ORG pin is connected to VCC or Logic HI, the  
(x16) memory organization is selected. When the ORG  
pin is tied to VSS or Logic LO, the (x8) memory  
organization is selected. For proper operation, ORG  
must be tied to a valid logic level.  
A logic level on the PE pin will enable or disable the abil-  
ity to write data to the memory array in only the 8-lead  
93XX76C and 93XX86C devices. For all other devices  
the PE function is not present and the PE pin is a no  
connect. When driving the PE pin to a logic High, the  
device can be programmed, but when the PE pin is  
driven Low, programming is inhibited. This pin is used  
in parallel with the EWEN/EWDS latch to protect the  
memory array from inadvertent writes, as shown in  
Table 4-2.  
For devices without the ORG functionality, there is no  
internal connection to the ORG pin. In these devices  
the functionality has been set at the factory to support  
a single word size.  
‘A’ series devices – x8 organization  
‘B’ series devices – x16 organization  
In either the 93XX76C or 93XX86C devices, the PE pin  
must be tied to a specific logic level and cannot be  
floated. In all other devices without the PE function, the  
PE pin has no internal connections and programming is  
always enabled.  
TABLE 4-2:  
WRITE PROTECTION SCHEME  
EWEN/EWDS Latch  
PE Pin*  
Array WRITE  
Enabled  
Disabled  
Enabled  
Disabled  
1
1
0
0
Yes  
No  
No  
No  
* PE pin level does not alter the state of the EWEN/EWDS latch.  
Note:  
For devices with PE functionality such as 93XX76C or 93XX86C, the write sequence requires a logic high  
signal on the PE pin prior to the rising edge of clock on the last data bit.  
DS21929D-page 18  
© 2007 Microchip Technology Inc.  
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