參數(shù)資料
型號(hào): μPD4265800
廠商: NEC Corp.
英文描述: 64 M-Bit Dynamic RAM(64M 動(dòng)態(tài)RAM)
中文描述: 64 m位動(dòng)態(tài)隨機(jī)存儲(chǔ)器(RAM的6400動(dòng)態(tài))
文件頁數(shù): 12/28頁
文件大小: 263K
代理商: ΜPD4265800
μ
PD4264800, 4265800
12
Fast Page Mode
Parameter
Symbol
t
RAC
= 50 ns
t
RAC
= 60 ns
Unit
Note
MIN.
MAX.
MIN.
MAX.
Fast page mode cycle time
t
PC
35
40
ns
Access time from CAS precharge
t
ACP
30
35
ns
RAS pulse width
t
RASP
50
125,000
60
125,000
ns
CAS precharge time
t
CP
8
10
ns
RAS hold time from CAS precharge
t
RHCP
30
35
ns
Read modify write cycle time
t
PRWC
73
83
ns
CAS precharge to WE delay time
t
CPWD
50
58
ns
1
Note 1.
If t
WCS
t
WCS (MIN.)
, the cycle is an early write cycle and the data out will remain Hi-Z through the entire cycle.
If t
RWD
t
RWD (MIN.)
, t
CWD
t
CWD (MIN.)
, t
AWD
t
AWD (MIN.)
and t
CPWD
t
CPWD (MIN.)
, the cycle is a read modify write
cycle and the data out will contain data read from the selected cell. If neither of the above conditions is
met, the state of the data out is indeterminate.
Refresh Cycle
Parameter
Symbol
t
RAC
= 50 ns
t
RAC
= 60 ns
Unit
Note
MIN.
MAX.
MIN.
MAX.
CAS setup time
t
CSR
5
5
ns
CAS hold time (CAS before RAS refresh)
t
CHR
10
10
ns
RAS precharge CAS hold time
t
RPC
5
5
ns
WE setup time
t
WSR
10
10
ns
WE hold time
t
WHR
15
15
ns
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