LH6V4256K-10 Просмотр технического описания (PDF) - Sharp Electronics
Номер в каталоге
Компоненты Описание
Список матч
LH6V4256K-10 Datasheet PDF : 18 Pages
| |||
LH6V4256
CMOS 1M (256K × 4) Dynamic RAM
FAST PAGE MODE CYCLE
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
NOTE
Fast page mode cycle time
tPC
60
ns
CAS precharge time
tCP
10
ns
CAS precharge access time
tCACP
55
ns
Read-write cycle time (page mode)
tPRWC
125
ns
1
NOTE:
1. tRWC, tRWD, tAWD, tCWD, and tPRWC are not restrictive operating parameters and does not represent a limit of operation.
WRITE CYCLE
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
NOTE
EARLY WRITE
Write command setup time (CAS)
Write command hold time (CAS)
Data input setup time
Data input hold time
tWCS
0
tWCH
15
tDS
0
tDH
20
OE CONTROLLED
ns
1
ns
ns
ns
CAS setup time
tCWS
0
ns
1
Write command lead time (RAS)
tRWL
30
ns
Write command lead time (CAS)
tCWL
25
ns
Write pulse width (WE)
tWP
15
ns
OE hold time (WE)
tOEH
20
ns
NOTE:
1. tWCS and tCWS are not restrictive operating parameters. If tWCS ≥ tWCS (MIN), the cycle is an early write cycle
and data out buffers remain inactive until CAS rises again.
READ-WRITE CYCLE/READ-MODIFY-WRITE CYCLE
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
NOTE
Read-write cycle time
tRWC
260
ns
1
WE delay time (RAS)
tRWD
135
ns
1
Column address delay time (WE)
tAWD
85
ns
1
WE delay time (CAS)
tCWD
65
ns
1
OE delay time
tOED
25
ns
NOTE:
1. tRWC, tRWD, tAWD, tCWD, and tPRWC are not restrictive operating parameters and does not represent a limit of operation.
CAS BEFORE RAS REFRESH CYCLE/HIDDEN REFRESH CYCLE
PARAMETER
SYMBOL
MIN.
CAS setup time (RAS)
tCSR
0
CAS hold time (RAS)
tCHR
20
RAS • CAS precharge time (RAS ↑)
tRPCP
10
RAS • CAS precharge time (RAS ↓)
tRPCN
115
WE precharge time (RAS)
tWRP
0
MAX.
UNIT
ns
ns
ns
ns
ns
2-20
Share Link: 