![](http://datasheet.mmic.net.cn/330000/MSM54C864-10ZS_datasheet_16442279/MSM54C864-10ZS_7.png)
Semiconductor
MSM54C864
7/33
AC Characteristics (2/3)
Parameter
Symbol
Note
Unit
ns
ns
ns
ns
55
0
0
—
45
0
0
—
45
0
0
—
ns
ns
20
—
0
10
—
0
10
—
0
ns
ns
ns
10
10
0
—
10
10
0
—
10
10
0
—
t
RWD
t
AWD
t
CWD
t
DZC
t
DZO
t
OEA
t
OEZ
t
OED
t
CSR
t
CHR
t
RPC
t
REF
t
WSR
t
RWH
t
MS
t
MH
t
THS
t
THH
t
TLS
t
TLH
Max.
—
—
—
—
Min.
0
15
Max.
—
—
—
—
Min.
0
15
Max.
—
—
—
—
Min.
0
15
-10
-80
-70
ns
ns
130
80
100
65
100
65
ms
ns
ns
ns
ns
ns
ns
ns
ns
4
—
—
—
—
—
—
—
4
—
—
—
—
—
—
—
4
—
—
—
—
—
—
—
0
15
0
15
0
15
0
15
0
15
0
15
0
15
0
15
0
15
0
15
0
15
0
15
25
20
20
ns
ns
20
15
10
15
10
15
t
OEH
t
ROH
t
TRP
t
TP
t
RSD
t
ASD
t
CSD
t
TSL
70
30
100
50
25
5
60
20
80
45
25
5
60
20
70
45
20
5
12
12
10k
10k
10k
ns
ns
ns
ns
ns
ns
t
RTH
80
65
60
ns
10k
10k
10k
t
ATH
30
30
25
ns
t
CTH
25
25
20
ns
t
ESR
t
REH
ns
ns
0
0
0
15
15
15
12
Column Address to First SC Delay Time (Read Transfer)
CAS
to First SC Delay Time (Read Transfer)
Column Address to
WE
Delay Time
CAS
to
WE
Delay Time
Data to
CAS
Delay Time
Data to
OE
Delay Time
Access Time from
OE
Output Buffer Turn-off Delay from
OE
OE
to Data Delay Time
CAS
Hold Time for
CAS
before
RAS
Cycle
RAS
Precharge to
CAS
Active Time
CAS
Set-up Time for
CAS
before
RAS
Cycle
SE
Set-up Time referenced to
RAS
SE
Hold Time referenced to
RAS
DT
to
RAS
Precharge Time
DT
Precharge Time
Write Per Bit Mask Data Hold Time
DT
High Set-up Time
Write Per Bit Mask Data Set-up Time
OE
Command Hold Time
RAS
Hold Time referenced to
OE
Refresh Period
WB
Set-up Time
RAS
to
WE
Delay Time
WB
Hold Time
RAS
to First SC Delay Time (Read Transfer)
Last SC to
DT
Lead Time (Real Time Read Transfer)
DT
Low Hold Time referenced to Column Address
(Real Time Read Transfer)
DT
Low Hold Time referenced to
CAS
(Real Time Read Transfer)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
DT
High Hold Time
DT
Low Set-up Time
DT
Low Hold Time
DT
Low Hold Time referenced to
RAS
(Real Time Read Transfer)
ns
ns
t
DS
t
DH
ns
ns
70
0
55
0
55
0
t
DHR
t
WCS
11
11
Data Hold Time
Data Hold Time referenced to
RAS
Write Command Set-up Time
Data Set-up Time
12
20
10
10
(V
CC
= 5 V ±10%, Ta = 0°C to 70°C) Note 4, 5, 6
9
7