IS42S16800E View Datasheet(PDF) - Integrated Silicon Solution
Part Name
Description
Manufacturer
IS42S16800E Datasheet PDF : 61 Pages
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IS42S81600E, IS42S16800E
OPERATING FREQUENCY / LATENCY RELATIONSHIPS
Symbol Parameter
-5
-6
-7
-75E Units
—
Clock Cycle Time
—
Operating Frequency (CAS Latency = 3)
5
6
7
7.5
ns
200
166
143
133* MHz
tcac
CAS Latency
3
3
3
2*
cycle
trcd
Active Command To Read/Write Command Delay Time
3
3
3
trac
RAS Latency (trcd + tcac)
CAS Latency = 3
6
6
6
CAS Latency = 2
—
—
—
2*
cycle
—
cycle
4
trc
Command Period (REF to REF / ACT to ACT)
10
10
10
9
cycle
tras
Command Period (ACT to PRE)
7
7
7
6
cycle
trp
Command Period (PRE to ACT)
3
3
3
2
cycle
trrd
Command Period (ACT[0] to ACT [1])
2
2
2
2
cycle
tccd
Column Command Delay Time
(READ, READA, WRIT, WRITA)
1
1
1
1
cycle
tdpl
Input Data To Precharge Command Delay Time
2
2
2
2
cycle
tdal
Input Data To Active/Refresh Command Delay Time
(During Auto-Precharge)
5
5
5
trbd
Burst Stop Command To Output in HIGH-Z Delay Time CAS Latency = 3
3
3
3
(Read)
CAS Latency = 2
—
—
—
4
cycle
— cycle
2
twbd
Burst Stop Command To Input in Invalid Delay Time
(Write)
0
0
0
trql
Precharge Command To Output in HIGH-Z Delay Time CAS Latency = 3
3
3
3
(Read)
CAS Latency = 2
—
—
—
0
cycle
—
cycle
2
twdl
Precharge Command To Input in Invalid Delay Time
(Write)
0
0
0
tpql
Last Output To Auto-Precharge Start Time (Read) CAS Latency = 3
-2
-2
–2
CAS Latency = 2
—
—
—
0
cycle
—
cycle
-1
tqmd
DQM To Output Delay Time (Read)
2
2
2
2
cycle
tdmd
DQM To Input Delay Time (Write)
0
0
0
0
cycle
tmrd
Mode Register Set To Command Delay Time
* for -75E, CAS Latency = 2
2
2
2
2
cycle
18
Integrated Silicon Solution, Inc. — www.issi.com
Rev. B
05/27/09
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