IS42S81600D, IS42S16800D
OPERATING FREQUENCY / LATENCY RELATIONSHIPS
SYMBOL PARAMETER
UNITS
—
—
Clock Cycle Time
6
7
7.5
ns
Operating Frequency (CAS Latency = 3)
166
143
133
MHz
tCAC
tRCD
tRAC
tRC
CAS Latency
3
3
3
3
3
3
cycle
cycle
cycle
cycle
cycle
cycle
cycle
cycle
Active Command To Read/Write Command Delay Time
RAS Latency (tRCD + tCAC)
CAS Latency = 3
6
6
6
Command Period (REF to REF / ACT to ACT)
Command Period (ACT to PRE)
Command Period (PRE to ACT)
Command Period (ACT[0] to ACT [1])
10
7
10
7
10
7
tRAS
tRP
3
3
3
tRRD
tCCD
2
2
2
Column Command Delay Time
(READ, READA, WRIT, WRITA)
1
1
1
tDPL
tDAL
Input Data To Precharge Command Delay Time
2
5
2
5
2
5
cycle
cycle
Input Data To Active/Refresh Command Delay Time
(During Auto-Precharge)
tRBD
tWBD
tRQL
tWDL
Burst Stop Command To Output in HIGH-Z Delay Time CAS Latency = 3
(Read)
3
0
3
0
3
0
3
0
3
0
3
0
cycle
cycle
cycle
cycle
Burst Stop Command To Input in Invalid Delay Time
(Write)
PrechargeCommandToOutputinHIGH-ZDelayTime
(Read)
CAS Latency = 3
Precharge Command To Input in Invalid Delay Time
(Write)
tPQL
tQMD
tDMD
tMRD
LastOutputToAuto-PrechargeStartTime(Read)
DQM To Output Delay Time (Read)
DQM To Input Delay Time (Write)
CAS Latency = 3
-2
2
–2
2
-2
2
cycle
cycle
cycle
cycle
0
0
0
Mode Register Set To Command Delay Time
2
2
2
18
Integrated Silicon Solution, Inc. — www.issi.com
Rev. E
07/28/08
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
