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參數(shù)資料
| 型號(hào)： | MB8116400A-50 |
| 廠商： | Fujitsu Limited |
| 英文描述： | CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4 位快速頁面存取模式動(dòng)態(tài)RAM) |
| 中文描述： | 的CMOS 4米× 4位快速頁面模式的DRAM（的CMOS 4米× 4位快速頁面存取模式動(dòng)態(tài)內(nèi)存） |
| 文件頁數(shù)： | 19/25頁 |
| 文件大?。?/td> | 307K |
| 代理商： | MB8116400A-50 |
19
MB8116400A-50/MB8116400A-60/MB8116400A-70
HIGH-Z
“H” or “L”
HIGH-Z
ROW ADDRESS
“H” or “L”
Fig. 12 – RAS-ONLY REFRESH (WE = OE = “H” or “L”)
Fig. 13 – CAS-BEFORE-RAS REFRESH (ADDRESSES = OE = “H” or “L”)
DESCRIPTION
Refresh of RAM memory cells is accomplished by performing a read, a write, or a read-modify-write cycle at each of 4096 row
addresses every 65.6-milliseconds. Three refresh modes are available: RAS-only refresh, CAS-before-RAS refresh, and hidden
refresh.
RAS-only refresh is performed by keeping RAS Low and CAS High throughout the cycle; the row address to be refreshed is
latched on the falling edge of RAS. During RAS-only refresh, D
OUT
pin is kept in a high-impedance state.
DESCRIPTION
CAS-before-RAS refresh is an on-chip refresh capability that eliminates the need for external refresh addresses. If CAS is held Low
for the specified setup time (t
CSR
) before RAS goes Low, the on-chip refresh control clock generators and refresh address counter
are enabled. An internal refresh operation automatically occurs and the refresh address counter is internally incremented in prep-
aration for the next CAS-before-RAS refresh operation.
t
RAS
t
RC
t
RP
t
RPC
t
RAH
t
ASR
t
CRP
t
OFF
t
OH
t
RC
t
RP
t
RAS
t
CPN
t
CSR
t
CHR
t
RPC
t
OFF
t
OH
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
RAS
A
0
to A
11
V
OH
V
OL
DQ
(Output)
CAS
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
RAS
WE
CAS
V
OH
V
OL
DQ
(Output)
t
WHR
t
WSR
相關(guān)PDF資料 |
PDF描述 |
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| MB8116400A-60 | CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4 位快速頁面存取模式動(dòng)態(tài)RAM) |
| MB8116400A-70 | CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4 位快速頁面存取模式動(dòng)態(tài)RAM) |
| MB8116400B-50 | 4 M ×4 BITS Fast Page Mode Dynamic RAM(CMOS 4 M ×4 位快速頁面存取模式RAM) |
| MB8116400B-60 | 4 M ×4 BITS Fast Page Mode Dynamic RAM(CMOS 4 M ×4 位快速頁面存取模式RAM) |
| MB8116405A-60 | CMOS 4M ×4 BIT Hyper Page Mode Dynamic RAM(CMOS 4M ×4 位超級(jí)頁面存取模式動(dòng)態(tài)RAM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB8116E | 制造商:FUJITSU 功能描述: 制造商:FUJITSU 功能描述:8116E |
| MB8117800A-60 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2 M X 8 BIT FAST PAGE MODE DYNAMIC RAM |
| MB8117800A-70 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2 M X 8 BIT FAST PAGE MODE DYNAMIC RAM |
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