¡ Semiconductor
AC Characteristics (1/3)
Parameter
MSM548263
-60
-70
-80
Symbol
Unit Note
Min. Max. Min. Max. Min. Max.
Random Read or Write Cycle Time
Read Modify Write Cycle
tRC
tRWC
tPC
120
170
40
85
—
—
—
—
0
—
—
—
—
60
30
15
35
15
35
—
140
185
45
90
—
—
—
—
0
—
—
—
—
70
35
20
40
20
35
—
150
195
50
90
—
—
—
—
0
—
—
—
—
80
40
25
45
20
35
—
ns
ns
Fast Page Mode Cycle Time
Fast Page Mode Read Modify Write Cycle Time
Access Time from RAS
ns
tPRWC
tRAC
tAA
ns
ns 8% 14
ns 8% 14
ns 8% 15
ns 8% 15
Access Time from Column Address
Access Time from CAS
tCAC
tCPA
tOFF
tT
Access Time from CAS Precharge
Output Buffer Turn-off Delay
Transition Time (Rise and Fall)
RAS Precharge Time
ns
ns
ns
10
7
3
3
3
tRP
50
60
60
RAS Pulse Width
tRAS
tRASP
tRSH
tCSH
tCAS
tRCD
tRAD
tRAL
tCRP
tCP
60 10k 70 10k 80 10k ns
60 100k 70 100k 80 100k ns
RAS Pulse Width (Fast Page Mode Only)
RAS Hold Time
15
60
—
—
20
70
—
—
25
80
—
—
ns
ns
CAS Hold Time
CAS Pulse Width
15 10k 20 10k 25 10k ns
RAS to CAS Delay Time
20
15
30
10
10
0
45
30
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
20
15
35
10
10
0
50
35
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
20
15
40
10
10
0
55
40
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
14
14
RAS to Column Address Delay Time
Column Address to RAS Lead Time
CAS to RAS Precharge Time
CAS Precharge Time (Fast Page Mode)
Row Address Set-up Time
tASR
tRAH
tASC
tCAH
tAR
Row Address Hold Time
10
0
10
0
10
0
Column Address Set-up Time
Column Address Hold Time
Column Address Hold Time referenced to RAS
Read Command Set-up Time
Read Command Hold Time
10
50
0
10
55
0
12
55
0
tRCS
tRCH
tRRH
tCRL
tRCL
tCOH
tWCS
tWCH
tWCR
tWP
0
0
0
11
11
Read Command Hold Time referenced to RAS
CAS "H" to RAS "H" Lead Time
RAS "H" to CAS "H" Lead Time
Data Output Hold after CAS Low
Write Command Set-up Time
Write Command Hold Time
0
0
0
0
0
0
0
0
0
5
5
5
19
13
0
0
0
10
50
10
15
15
12
55
12
20
20
15
55
15
20
20
Write Command Hold Time referenced to RAS
Write Command Pulse Width
Write Command to RAS Lead Time
Write Command to CAS Lead Time
tRWL
tCWL
6/40