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參數(shù)資料
| 型號： | μPD4264405 |
| 廠商： | NEC Corp. |
| 英文描述： | 16,777,216 Words by 4 Bits CMOS Dynamic RAMs(64M 動態(tài)RAM) |
| 中文描述： | 16,777,216詞由4位的CMOS動態(tài)存儲器（RAM的6400動態(tài)） |
| 文件頁數(shù)： | 27/36頁 |
| 文件大?。?/td> | 256K |
| 代理商： | ΜPD4264405 |
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μ
PD4264405, 42S65405, 4265405
27
CAS Before RAS Self Refresh Cycle (Only for the
μ
PD42S65405)
Remark
Address, OE: Don’t care I/O: Hi-Z
RAS
CAS
WE
V
IH_
V
IL_
V
IH_
V
IL_
V
IH_
V
IL_
t
CSR
t
WSR
t
WHR
t
RASS
t
RPS
t
CRP
t
RPC
t
CHS
t
CPN
Cautions on Use of CAS Before RAS Self Refresh
CAS before RAS self refresh can be used independently when used in combination with distributed CAS
before RAS long refresh; However, when used in combination with burst CAS before RAS long refresh or with
long RAS only refresh (both distributed and burst), the following cautions must be observed.
(1) Normal Combined Use of CAS Before RAS Self Refresh and Burst CAS Before RAS Long Refresh
When CAS before RAS self refresh and burst CAS before RAS long refresh are used in combination, please
perform CAS before RAS refresh 4,096 times within a 64 ms interval just before and after setting CAS before
RAS self refresh.
(2) Normal Combined Use of CAS Before RAS Self Refresh and Long RAS Only Refresh
When CAS before RAS self refresh and RAS only refresh are used in combination, please perform RAS only
refresh 4,096 times within a 64 ms interval just before and after setting CAS before RAS self refresh.
(3)
If t
RASS (MIN.)
is not satisfied at the beginning of CAS before RAS self refresh cycles (t
RAS
< 100
μ
s), CAS before
RAS refresh cycles will be executed one time.
If 10
μ
s < t
RAS
< 100
μ
s, RAS precharge time for CAS before RAS self refresh (t
RPS
) is applied.
And refresh cycles (4,096/128 ms) should be met.
For details, please refer to
How to use DRAM
User’s Manual.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| μPD4265405 | 16,777,216 Words by 4 Bits CMOS Dynamic RAMs(64M 動態(tài)RAM) |
| μPD42S65805 | 8,388,608 Words by 8 Bits CMOS dynamic RAMs(64M 動態(tài)RAM) |
| μPD4264805 | 8,388,608 Words by 8 Bits CMOS dynamic RAMs(64M 動態(tài)RAM) |
| μPD4265805 | 8,388,608 Words by 8 Bits CMOS dynamic RAMs(64M 動態(tài)RAM) |
| μPD431009 | 1M-Bit CMOS Fast Static RAM(1M位CMOS 快速靜態(tài)) |
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| PD42-CAMO12 | 制造商:P-TEC 制造商全稱:P-tec Corporation 功能描述:Three Digit 7 Segment 0.56” Display |
| PD42-CAMR21 | 制造商:P-TEC 制造商全稱:P-tec Corporation 功能描述:Three Digit 7 Segment 0.56” Display |
| PD42-CAMR24 | 制造商:P-TEC 制造商全稱:P-tec Corporation 功能描述:Three Digit 7 Segment 0.56” Display |
| PD42-CAMY01 | 制造商:P-TEC 制造商全稱:P-tec Corporation 功能描述:Three Digit 7 Segment 0.56” Display |
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