Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
37
Rev. 00D
06/02/08
IS42S32200E
OPERATING FREQUENCY / LATENCY RELATIONSHIPS
(1)
SYMBOL PARAMETER CONDITION -5 -6 -7 UNITS
— Clock Cycle Time 5 6 7 ns
— Operating Frequency CL=3 200 166 143 MHz
tCCD READ/WRITE command to READ/WRITE command 1 1 1 cycle
tCKED CKE to clock disable or power-down entry mode 1 1 1 cycle
tPED CKE to clock enable or power-down exit setup mode 1 1 1 cycle
tDQD DQM to input data delay 0 0 0 cycle
tDQM DQM to data mask during WRITEs 0 0 0 cycle
tDQZ DQM to data high-impedance during READs 2 2 2 cycle
tDWD WRITE command to input data delay 0 0 0 cycle
tDAL Data-in to ACTIVE command CL=3 5 5 5 cycle
CL=2 4 4 4
tDPL Data-in to PRECHARGE command 2 2 2 cycle
tBDL Last data-in to burst STOP command 1 1 1 cycle
tCDL Last data-in to new READ/WRITE command 1 1 1 cycle
tRDL Last data-in to PRECHARGE command 2 2 2 cycle
tMRD LOAD MODE REGISTER command 2 2 2 cycle
to ACTIVE or REFRESH command
tROH Data-out to high-impedance from CL = 3 3 3 3 cycle
PRECHARGE command CL = 2 2 2 2
Note:
1. If CL = 2, the minimum t
CK2 is 10ns.
AC TEST CONDITIONS (Input/Output Reference Level: 1.5V)
Input Load
Output Load
2.75V
1.5V
0.25V
CLK
INPUT
OUTPUT
t
CHI
tCH
tAC
tOH
tCS
tCK
tCL
2.75V
1.5V
1.5V 1.5V
0.25V
I/O
50 Ω
+1.5V
30 pF
