HYB18T512xxxBF–[2.5…5]
512-Mbit Double-Data-Rate-Two SDRAM
5.2
DC Characteristics
Table 21
Symbol
Recommended DC Operating Conditions (SSTL_18)
Parameter
Rating
Min.
Unit
Note
Typ.
1.8
Max.
1.9
1)
VDD
Supply Voltage
1.7
V
V
V
V
V
VDDDL
VDDQ
VREF
VTT
Supply Voltage for DLL
Supply Voltage for Output
Input Reference Voltage
Termination Voltage
1.7
1.8
1.9
—
1.7
1.8
1.9
—
2)3)
0.49 × VDDQ
0.5 × VDDQ
VREF
0.51 × VDDQ
4)
V
REF – 0.04
VREF + 0.04
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 × 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
.
Table 22
ODT DC Electrical Characteristics
Parameter / Condition
Symbol
Min.
Nom.
Max.
Unit
Note
1)
Termination resistor impedance value for
EMRS(1)[A6,A2] = [0,1]; 75 Ohm
Rtt1(eff)
60
75
90
Ω
Termination resistor impedance value for
EMRS(1)[A6,A2] =[1,0]; 150 Ohm
Rtt2(eff)
Rtt3(eff)
delta VM
120
40
150
50
180
Ω
Ω
%
—
Termination resistor impedance value for
EMRS(1)(A6,A2)=[1,1]; 50 Ohm
60
—
2)
Deviation of VM with respect to VDDQ / 2
–6.00
—
+ 6.00
1) Measurement Definition for Rtt(eff): Apply VIH(ac) and VIL(ac) to test pin separately, then measure current I(VIHac) and I(VILac
respectively. Rtt(eff) = (VIH(ac) – VIL(ac)) /(I(VIHac) – I(VILac)).
)
2) Measurement Definition for VM: Turn ODT on and measure voltage (VM) at test pin (midpoint) with no load:
delta VM = ((2 x VM / VDDQ) – 1) x 100%
Table 23
Symbol
IIL
Input and Output Leakage Currents
Parameter / Condition
Min.
–2
Max.
+2
Unit
µA
Note
1)
Input Leakage Current; any input 0 V < VIN < VDD
Output Leakage Current; 0 V < VOUT < VDDQ
2)
IOL
–5
+5
µA
1) All other pins not under test = 0 V
2) DQ’s, LDQS, LDQS, UDQS, UDQS, DQS, DQS, RDQS, RDQS are disabled and ODT is turned off
Internet Data Sheet
26
Rev. 1.05, 2007-01
03292006-YBYM-WG0Z
QIMONDA [ QIMONDA AG ]
