Rev. 1.2 / Dec 2006
10
1
HY5PS1G431(L)F
1
HY5PS1G831(L)F
3.1 DC Operating Conditions
3.1.1 Recommended DC Operating Conditions (SSTL_1.8)
3.1.2 ODT DC electrical characteristics
PARAMETER/CONDITION
Rtt effective impedance value for EMRS(A6,A2)=0,1; 75 ohm
Rtt effective impedance value for EMRS(A6,A2)=1,0; 150 ohm
Rtt effective impedance value for EMRS(A6,A2)=1,1; 50 ohm
Deviation of V
M
with respect to VDDQ/2
Note 1: Test condition for Rtt measurements
Measurement Definition for Rtt(eff):
Apply V
IH
(ac) and V
IL
(ac) to test pin separately, then measure current I(V
IH
(ac)) and I( V
IL
(ac)) respectively. V
IH
(ac), V
IL
(ac), and VDDQ values defined in SSTL_18
Measurement Definition for VM :
Measurement Voltage at test pin(mid point) with no load.
Symbol
Parameter
Rating
Units
Notes
Min.
Typ.
Max.
VDD
Supply Voltage
1.7
1.8
1.9
V
VDDL
Supply Voltage for DLL
1.7
1.8
1.9
V
4
VDDQ
Supply Voltage for Output
1.7
1.8
1.9
V
4
VREF
Input Reference Voltage
0.49*VDDQ
0.50*VDDQ
0.51*VDDQ
mV
1, 2
VTT
Termination Voltage
V
REF
-0.04
V
REF
V
REF
+0.04
V
3
There is no specific device VDD supply voltage requirement for SSTL-1.8 compliance. However under all conditions VDDQ must
be less than or equal to VDD.
1. 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.
2. Peak to peak ac noise on VREF may not exceed +/-2% VREF (dc).
3. VTT of transmitting device must track VREF of receiving device.
4. VDDQ tracks with VDD, VDDL tracks with VDD. AC parameters are measured with VDD, VDDQ and VDDDL tied together
SYMBOL
Rtt1(eff)
Rtt2(eff)
Rtt2(eff)
delta VM
MIN
60
120
40
-6
NOM
75
150
50
MAX
90
180
60
+6
UNITS
ohm
ohm
ohm
%
NOTES
1
1
1
1
delta VM =
2 x Vm
VDDQ
x 100%
- 1
3. AC & DC Operating Conditons
Rtt(eff) =
V
IH
(ac)
-
V
IL
(ac)
I(
V
IH
(ac)
) - I(
V
IL
(ac)
)