參數(shù)資料
型號(hào)： MB814260-60
廠商： Fujitsu Limited
英文描述： CMOS 256K ×16 BIT FAST PAGE MODE DYNAMIC RAM(CMOS 256K ×16 位快速頁(yè)面存取模式動(dòng)態(tài)RAM)
中文描述： 的CMOS 256K × 16位快速頁(yè)面模式的動(dòng)態(tài)隨機(jī)存儲(chǔ)器（的CMOS 256K × 16位快速頁(yè)面存取模式動(dòng)態(tài)內(nèi)存）
文件頁(yè)數(shù)： 20/26頁(yè)
文件大小： 517K
代理商： MB814260-60
20
MB814260-60/MB814260-70
Fig. 13 – RAS-ONLY REFRESH (WE = 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 512 row
addresses every 8.2-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 LCAS and UCAS High throughout the cycle; the row address to be
refreshed is latched on the falling edge of RAS. During RAS-only refresh, DQ pins are kept in a high-impedance state.
“H” or
HIGH-Z
ROW ADDRESS
V
IH
V
IL
RAS
V
IH
V
IL
V
IH
V
IL
A
0
to A
9
DQ
(Output)
V
OH
V
OL
t
RC
t
RP
t
ASR
t
RPC
t
RAH
t
OH
t
RAS
t
OFF
t
CRP
LCAS
and
UCAS
HIGH-Z
t
CPN
t
CSR
t
CHR
t
RPC
Fig. 14 – CAS-BEFORE-RAS REFRESH (ADDRESSES = WE = OE = “H” or “L”)
DQ
(Output)
RAS
V
IH
V
IL
V
IH
V
IL
V
OH
V
OL
DESCRIPTION
CAS-before-RAS refresh is an on-chip refresh capability that eliminates the need for external refresh addresses. If LCAS or UCAS
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 preparation for the next CAS-before-RAS refresh operation.
“H” or
t
RC
t
RAS
t
RP
t
OFF
t
OH
LCAS
and
UCAS
相關(guān)PDF資料
PDF描述
MB814260-70 CMOS 256K ×16 BIT FAST PAGE MODE DYNAMIC RAM(CMOS 256K ×16 位快速頁(yè)面存取模式動(dòng)態(tài)RAM)
MB814265-60 CMOS 256K ×16 BIT Hyper Page Mode Dynamic RAM(CMOS 256K ×16 位超級(jí)頁(yè)面存取模式動(dòng)態(tài)RAM)
MB814265-70 CMOS 256K ×16 BIT Hyper Page Mode Dynamic RAM(CMOS 256K ×16 位超級(jí)頁(yè)面存取模式動(dòng)態(tài)RAM)
MB814400A-60 CMOS 4 M ×1 BIT Fast Page Mode DRAM(CMOS 4M ×1 位快速頁(yè)面存取模式動(dòng)態(tài)RAM)
MB814400A-70 CMOS 4 M ×1 BIT Fast Page Mode DRAM(CMOS 4M ×1 位快速頁(yè)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
MB814400C-70PJN 制造商:FUJITSU 功能描述:Dynamic RAM, Fast Page, 1M x 4, 26 Pin, Plastic, SOJ
MB814405D-60PJN 制造商:FUJITSU Component Ltd 功能描述:
MB8146112 制造商:FUJITSU 功能描述:*
MB81461-12PSZ 制造商:FUJITSU 功能描述:VRAM, FAST PAGE, 64KX4, 24 Pin, Plastic, ZIP
MB81461B-12 制造商:FUJITSU 功能描述: 制造商:FUGITSU 功能描述:81461B-12 制造商:FUJITSU 功能描述:81461B-12
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