HYB18T256400AF Datasheet, PDF (64/90 Pages) Infineon Technologies AG – 256 Mbi t DDR2 SDRAM

HYB18T256400/800/160AF
256Mb DDR2 SDRAM
5. AC & DC Operating Conditions
5.1 DC Operating Conditions
5.1.1 Recommended DC Operating Conditions (SSTL_18)
Symbol
Parameter
Min.
Rating
Typ.
Max.
Units
Notes
VDD
Supply Voltage
1.7
1.8
1.9
V
1
VDDDL ^{Supply Voltage for DLL}
1.7
1.8
1.9
V
1
VDDQ ^{Supply Voltage for Output}
1.7
1.8
1.9
V
1
VREF ^{Input Reference Voltage} 0.49 * VDDQ 0.5 * VDDQ 0.51 * VDDQ
V
2, 3
VTT
Termination Voltage
VREF - 0.04
VREF
VREF + 0.04
V
4
1. VDDQ tracks with VDD, VDDDL tracks with VDD. AC parameters are measured with VDD, VDDQ and VDDDL tied together.
2. The value of VREF may be selected by the user to provide optimum noise margin in the system. Typically the value of VREF is
expected to be about 0.5 x VDDQ of the transmitting device and VREF is expected to track variations in VDDQ.
3. Peak to peak ac noise on VREF may not exceed +/- 2% VREF (dc).
4. VTT is not applied directly to the device. VTT is a system supply for signal termination resistors, is expected to be set equal to VREF
and must track variations in die dc level of VREF.
5.1.2 ODT DC Electrical Characteristics
Parameter / Condition
Rtt(eff) impedance value for EMRS(1)(A6,A2)=0,1; 75 ohm
Symbol
Rtt1(eff)
min.
60
nom.
75
max.
90
Units
Ω
Notes
1
Rtt(eff) impedance value for EMRS(1)(A6,A2)=1,0; 150 ohm Rtt2(eff) ₁₂₀
150
180
Ω
1
Deviation of VM with respect to VDDQ / 2
delta VM - 6.00
+ 6.00
%
2
1) Measurement Definition for Rtt(eff):
Apply VIH(ac) and VIL(ac) to test pin separately, then measure current Ι(VIHac) and Ι(VILac) respectively.
Rtt(eff) = (VIH(ac) - VIL(ac)) /(Ι(VIHac) - Ι(VILac))
2) Measurement Definition for VM:
Measure voltage (VM) at test pin (midpoint) with no load:
delta VM =((2* VM / VDDQ) - 1) x 100%
5.1.3 Input and Output Leakage Currents:
Symbol
Parameter / Condition
IIL Input Leakage Current; any input 0V < VIN < VDD
IOL Output Leakage Current; 0V < VOUT < VDDQ
notes: 1) all other pins not under test = 0V
2) DQ’s, DQS, DQS and ODT are disabled
min.
-2
-5
max.
+2
+5
Units
µΑ
µΑ
Notes
1
2
Page 64
Rev. 1.02 May 2004
INFINEON Technologies