參數(shù)資料
型號: μPD42S17405
廠商: NEC Corp.
英文描述: 16 M-Bit Dynamic RAM(16M 動態(tài)RAM)
中文描述: 16 m位動態(tài)隨機存儲器(RAM的1,600動態(tài))
文件頁數(shù): 27/40頁
文件大小: 319K
代理商: ΜPD42S17405
μ
PD42S17405, 4217405
27
CAS Before RAS Self Refresh Cycle (Only for the
μ
PD42S17405)
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
Remark
Address, OE : Don’t care I/O : Hi-Z
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 2,048 times within a 32 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 2,048 times within a 32 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 (2,048/128 ms) should be met.
For details, please refer to
How to use DRAM
User’s Manual.
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