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W27C512P-70 参数 Datasheet PDF下载

W27C512P-70图片预览
型号: W27C512P-70
PDF下载: 下载PDF文件 查看货源
内容描述: 64K ×8的电可擦除EPROM [64K X 8 ELECTRICALLY ERASABLE EPROM]
分类和应用: 存储内存集成电路输出元件输入元件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: 15 页 / 162 K
品牌: WINBOND [ WINBOND ]
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W27C512  
FUNCTIONAL DESCRIPTION  
Read Mode  
Like conventional UVEPROMs, the W27C512 has two control functions, both of which produce data  
PP  
CE  
OE  
/V controls the output buffer to gate data  
at the outputs.  
is for power control and chip select.  
ACC  
to the output pins. When addresses are stable, the address access time (T  
) is equal to the delay  
CE  
OE  
PP  
/V ,  
CE  
OE  
from  
to output (T ), and data are available at the outputs T  
after the falling edge of  
ACC  
CE  
if T  
and T timings are met.  
Erase Mode  
The erase operation is the only way to change data from "0" to "1." Unlike conventional UVEPROMs,  
which use ultraviolet light to erase the contents of the entire chip (a procedure that requires up to half  
an hour), the W27C512 uses electrical erasure. Generally, the chip can be erased within 100 mS by  
using an EPROM writer with a special erase algorithm.  
PP  
PE  
CC  
CE  
PE  
OE  
Erase mode is entered when  
/V is raised to V (14V), V  
= V (5V), A9 = V (14V), A0  
CE  
low, and all other address pins low and data input pins high. Pulsing  
operation.  
low starts the erase  
Erase Verify Mode  
After an erase operation, all of the bytes in the chip must be verified to check whether they have been  
CC  
successfully erased to "1" or not. The erase verify mode ensures a substantial erase margin if V  
=
CE  
V
PP  
CE  
OE  
/V low.  
(3.75V),  
low, and  
Program Mode  
Programming is performed exactly as it is in conventional UVEPROMs, and programming is the only  
PP  
PP  
OE  
way to change cell data from "1" to "0." The program mode is entered when  
/V is raised to V  
= V (5V), the address pins equal the desired addresses, and the input pins equal the  
CE  
CC  
(12V), V  
CP  
desired inputs. Pulsing  
low starts the programming operation.  
Program Verify Mode  
All of the bytes in the chip must be verified to check whether they have been successfully  
programmed with the desired data or not. Hence, after each byte is programmed, a program verify  
operation should be performed. The program verify mode automatically ensures a substantial  
PP  
OE  
CE  
low.  
program margin. This mode will be entered after the program operation if  
/V low and  
Erase/Program Inhibit  
Erase or program inhibit mode allows parallel erasing or programming of multiple chips with different  
CE  
data. When  
CE OE  
high, erasing or programming of non-target chips is inhibited, so that except for the  
PP  
and  
/V pins, the W27C512 may have common inputs.  
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