IS43DR86400 Datasheet, PDF (15/29 Pages) Integrated Silicon Solution, Inc – 512Mb (x8, x16) DDR2 SDRAM

IS43DR86400, IS43/46DR16320
Single‐ended AC Input logic level
Symbol
VIH(AC)
Parameter
AC input logic HIGH
DDR2‐400, DDR2‐533
Min.
Max.
VREF + 0.250 VDDQ + Vpeak
DDR2‐667, DDR2‐800
Min.
Max.
VREF + 0.200 VDDQ + Vpeak
VIL(AC)
AC input logic LOW VSSQ ‐ Vpeak VREF ‐ 0.250 VSSQ ‐ Vpeak VREF ‐ 0.200
Note: Refer to Overshoot and Undershoot Specification for Vpeak value: maximum peak amplitude allowed for overshoot and undershoot.
Units
V
V
AC Input Test Conditions
Symbol
Condition
Value
Units
Notes
VREF
Input reference voltage
0.5 x VDDQ
V
1
VSWING(Max)
Input signal maximum peak to peak swing
1.0
V
1
SLEW
Input signal minimum slew rate
1.0
V/ns
2, 3
Notes:
1. Input waveform timing is referenced to the input signal crossing through the VIH/IL(AC) level applied to the device under test.
2. The input signal minimum slew rate is to be maintained over the range from VREF to VIH(AC) min for rising edges and the range from VREF 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.
AC Input Test Signal Waveform
V_SWING(MAX)
Falling Slew =
ΔTF
V_REF - V_IL(ac) max
ΔTF
ΔTR
Rising Slew =
V_DDQ
V_IH(ac) min
V_IH(dc) min
V_REF
V_IL(dc) max
V_IL(ac) max
V_SS
V_IH(ac) min - V_REF
ΔTR
Differential Input AC logic level
Symbol
Parameter
Min.
Max.
Units Notes
VIH(AC)
AC input logic HIGH
VREF + 0.250
VDDQ + Vpeak
V
1
VIL(AC)
AC input logic LOW
VSSQ ‐ Vpeak
VREF ‐ 0.250
V
2
Notes:
1. VID(AC) specifies the input differential voltage |VTR ‐VCP | required for switching, where VTR is the true input signal (such as CK, DQS, LDQS or UDQS) and VCP
is the complementary input signal (such as CK#, DQS#, LDQS# or UDQS#). The minimum value is equal to V IH(AC) ‐ V IL(AC).
2. The typical value of VIX(AC) is expected to be about 0.5 x VDDQ of the transmitting device and VIX(AC) is expected to track variations in VDDQ. VIX(AC) indicates
the voltage at which differential input signals must cross.
Integrated Silicon Solution, Inc. – www.issi.com –
15
Rev. 00A, 11/17/2009