K4X56163PE Datasheet, PDF (34/48 Pages) Samsung semiconductor – 16M x16 Mobile DDR SDRAM

K4X56163PE-L(F)G
Mobile-DDR SDRAM
1. Input Setup/Hold Slew Rate Derating
Input Setup/Hold Slew Rate
∆tIS
(V/ns)
(ps)
1.0
0
0.8
+50
0.6
+100
This derating table is used to increase t_IS/t_IH in the case where the input slew rate is below 1.0V/ns.
∆tIH
(ps)
0
+50
+100
2. Minimum 3CLK of tDAL(= tWR + tRP) is required because it need minimum 2CLK for tWR and minimum 1CLK for tRP.
3. tSAC(min) value is measured at the high Vdd(1.95V) and cold temperature(-25°C).
tSAC(max) value is measured at the low Vdd(1.7V) and hot temperature(85°C).
tSAC is measured in the device with half driver strength and under the AC output load condition (Fig.2 in next Page).
4. The specific requirement is that DQS be valid(High or Low) on or before this CK edge. The case shown(DQS going from
High_Z to logic Low) applies when no writes were previously in progress on the bus. If a previous write was in progress,
DQS could be High at this time, depending on tDQSS.
5. I/O Setup/Hold Slew Rate Derating
I/O Setup/Hold Slew Rate
∆tDS
(V/ns)
(ps)
1.0
0
0.8
+75
0.6
+150
This derating table is used to increase t_DS/t_DH in the case where the I/O slew rate is below 1.0V/ns.
∆tDH
(ps)
0
+75
+150
6. I/O Delta Rise/Fall Rate(1/slew-rate) Derating
Delta Rise/Fall Rate
∆tDS
∆tDH
(ns/V)
(ps)
(ps)
0
0
0
±0.25
+50
+50
±0.5
+100
+100
This derating table is used to increase tDS/tDH in the case where the DQ and DQS slew rates differ. The Delta Rise/Fall Rate
is calculated as 1/SlewRate1-1/SlewRate2. For example, if slew rate 1 = 1.0V/ns and slew rate 2 =0.8V/ns, then the Delta Rise/Fall
Rate =-0.25ns/V.
34
March 2004