EBE25UC8AAFV Datasheet, PDF (17/22 Pages) Elpida Memory – 256MB Unbuffered DDR2 SDRAM HYPER DIMM™

EBE25UC8AAFV
ODT AC Electrical Characteristics (DDR2 SDRAM Component Specification)
Parameter
Symbol
min.
max.
Unit Notes
ODT turn-on delay
tAOND
2
2
tCK
ODT turn-on
tAON
tAC(min)
tAC(max) + 1000
ps 1
ODT turn-on (power down mode)
tAONPD
tAC(min) + 2000 2tCK + tAC(max) + 1000
ps
ODT turn-off delay
tAOFD
2.5
2.5
tCK
ODT turn-off
tAOF
tAC(min)
tAC(max) + 600
ps 2
ODT turn-off (power down mode)
tAOFPD
tAC(min) + 2000 2.5tCK + tAC(max) + 1000
ns
ODT to power down entry latency
tANPD
3
3
tCK
ODT power down exit latency
tAXPD
8
8
tCK
ENotes: 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 measured 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.
O_{AC Input Test Conditions}
Parameter
L ^{Input reference voltage}
Symbol
VREF
Value
Unit
0.5 × VDDQ
V
Notes
1
Input signal maximum peak to peak swing VSWING(max.)
1.0
V
1
Input signal maximum slew rate
SLEW
1.0
V/ns
2, 3
Notes: 1. Input waveform timing is referenced to the input signal crossing through the VREF level applied to the
device under test.
2. The input signal minimum slew rate is to be maintained over the range from VIL(DC) (max.) to VIH(AC)
P ^{(min.) for rising edges and the range from VIH(DC) (min.) to VIL(AC) (max.) for falling edges as shown in}
the below figure.
3. AC timings are referenced with input waveforms switching from VIL(AC) to VIH(AC) on the positive
transitions and VIH(AC) to VIL(AC) on the negative transitions.
r _{Start of falling edge input timing}
o _VSWING(max.)
Start of rising edge input timing
VDDQ
VIH (AC)(min.)
VIH (DC)(min.)
VREF
VIL (DC)(max.)
d_{VIL (AC)(max.)}
VSS
∆TF
∆TR
VIH (DC)(min.) − VIL (AC)(max.)
u Falling slew =
∆TF
VIH (AC) min. − VIL (DC)(max.)
Rising slew =
∆TR
AC Input Test Signal Wave forms
c _{Measurement point}
t ^DQ
VTT
RT =25 Ω
Output Load
Preliminary Data Sheet E0527E12 (Ver. 1.2)
17