English
Language : 

K4N51163QC-ZC Datasheet, PDF (8/64 Pages) Samsung semiconductor – 512Mbit gDDR2 SDRAM
◁
K4N51163QC-ZC
512M gDDR2 SDRAM
8.4 AC Input Test Conditions
Symbol
Condition
Value
Units
Note
VREF
Input reference voltage
0.5 * 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
Note :
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.
VSWING(MAX)
delta TF
delta TR
Falling Slew =
VREF - VIL(AC) max
delta TF
Rising Slew =
< AC Input Test Signal Waveform >
VDDQ
VIH(AC) min
VIH(DC) min
VREF
VIL(DC) max
VIL(AC) max
VSS
VIH(AC) min - VREF
delta TR
8.5 Differential input AC logic Level
Symbol
VID(AC)
VIX(AC)
Parameter
AC differential input voltage
AC differential cross point voltage
Min.
0.5
0.5 * VDDQ - 0.175
Max.
VDDQ + 0.6
0.5 * VDDQ + 0.175
Units
V
V
Note
1
2
Note :
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 VIH(AC) - VIL(AC).
2. The typical value of VIX(AC) is expected to be about 0.5 * 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.
VTR
VCP
VDDQ
VID
Crossing point
VIX or VOX
VSSQ
< Differential signal levels >
8.6 Differential AC output parameters
Symbol
Parameter
Min.
Max.
Units
Note
VOX(AC)
AC differential cross point voltage
0.5 * VDDQ - 0.125
0.5 * VDDQ + 0.125
V
1
Note :
1. The typical value of VOX(AC) is expected to be about 0.5 * VDDQ of the transmitting device and VOX(AC) is expected to track variations in VDDQ .
VOX(AC) indicates the voltage at which differential output signals must cross.
-8-
Rev 1.5 Oct. 2005
 ▷