Rev. 1.4 / July 2006

11

HY5PS12821(L)F

HY5PS121621(L)F

3.1 DC Operating Conditions

3.1.1 Recommended DC Operating Conditions (SSTL_1.8)

3.1.2 ODT DC electrical characteristics

Note 1: Test condition for Rtt measurements

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

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

PARAMETER/CONDITION

SYMBOL

MIN

NOM

MAX

UNITS NOTES

Rtt effective impedance value for EMRS(A6,A2)=0,1; 75 ohm

Rtt1(eff)

60

75

90

ohm

1

Rtt effective impedance value for EMRS(A6,A2)=1,0; 150 ohm

Rtt2(eff)

120

150

180

ohm

1

Rtt effective impedance value for EMRS(A6,A2)=1,1; 50 ohm

Rtt2(eff)

40

50

60

ohm

1

delta VM

-6

+6

%

1

delta VM =

2 x Vm

VDDQ

x 100%

- 1

3. AC & DC Operating Conditions

Rtt(eff) =

V