參數(shù)資料
型號(hào)： UPD42S18165L
廠商： NEC Corp.
英文描述： 3.3 V OPERATION 16 M-BIT DYNAMIC RAM 1 M-WORD BY 16-BIT, EDO, BYTE READ/WRITE MODE
中文描述： 3.3 V工作16 m位動(dòng)態(tài)隨機(jī)存儲(chǔ)器1個(gè)M字由16位，江戶(hù)，字節(jié)讀/寫(xiě)模式
文件頁(yè)數(shù)： 38/48頁(yè)
文件大小： 319K
代理商： UPD42S18165L
μ
PD42S18165L, 4218165L
38
CAS Before RAS Self Refresh Cycle (Only for the
μ
PD42S18165L)
t
CSR
V
IH
–
V
IL
–
RAS
t
RASS
t
RPS
t
CRP
t
RPC
t
CHS
t
CPN
V
IH
–
V
IL
–
UCAS
LCAS
Remark
Address, WE, OE: Don’t care
L I/O, U 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 1,024 times within a 16 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 1,024 times within a 16 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 (1,024/128 ms) should be met.
For details, please refer to
How to use DRAM
User’s Manual.
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