Internet Data Sheet
HYS[64/72]T[32/64/128]xx0HU–[3/3S/3.7/5]–A
Unbuffered DDR2 SDRAM Modules
3.3.3
ODT AC Electrical Characteristics
This chapter contains the ODT AC electrical characteristics tables.
TABLE 20
ODT AC Characteristics and Operating Conditions for DDR2-667
Symbol
Parameter / Condition
Values
Unit
Note
Min.
Max.
tAOND
tAON
ODT turn-on delay
2
2
tCK
ns
ns
tCK
ns
ns
tCK
tCK
1)
2)
ODT turn-on
tAC.MIN
tAC.MAX + 0.7 ns
tAONPD
tAOFD
tAOF
ODT turn-on (Power-Down Modes)
ODT turn-off delay
t
AC.MIN + 2 ns
2 tCK + tAC.MAX + 1 ns
2.5
2.5
ODT turn-off
tAC.MIN
tAC.MAX + 0.6 ns
tAOFPD
tANPD
tAXPD
ODT turn-off (Power-Down Modes)
ODT to Power Down Mode Entry Latency
ODT Power Down Exit Latency
t
AC.MIN + 2 ns
2.5 tCK + tAC.MAX + 1 ns
3
8
—
—
1) ODT turn on time min. is when the device leaves high impedance and ODT resistance begins to turn on. ODT turn on time max is when
the ODT resistance is fully on. Both are measure from tAOND
2) ODT turn off time min. is when the device starts to turn off ODT resistance. ODT turn off time max is when the bus is in high impedance.
Both are measured from tAOFD
.
.
TABLE 21
ODT AC Characteristics and Operating Conditions for DDR2-533/DDR2-400
Symbol
Parameter / Condition
Values
Unit
Note
Min.
Max.
tAOND
tAON
ODT turn-on delay
2
2
tCK
ns
ns
tCK
ns
ns
tCK
tCK
1)
2)
ODT turn-on
tAC.MIN
tAC.MAX + 1 ns
tAONPD
tAOFD
tAOF
ODT turn-on (Power-Down Modes)
ODT turn-off delay
t
AC.MIN + 2 ns
2 tCK + tAC.MAX + 1 ns
2.5
2.5
ODT turn-off
tAC.MIN
tAC.MAX + 0.6 ns
tAOFPD
tANPD
tAXPD
ODT turn-off (Power-Down Modes)
ODT to Power Down Mode Entry Latency
ODT Power Down Exit Latency
t
AC.MIN + 2 ns
2.5 tCK + tAC.MAX + 1 ns
3
8
—
—
1) ODT turn on time min. is when the device leaves high impedance and ODT resistance begins to turn on. ODT turn on time max is when
the ODT resistance is fully on. Both are measure from tAOND
2) ODT turn off time min. is when the device starts to turn off ODT resistance. ODT turn off time max is when the bus is in high impedance.
.
Both are measured from tAOFD
.
Rev. 1.41, 2007-05
31
03292006-EZUJ-JY4S
QIMONDA [ QIMONDA AG ]
