EDJ2104BASE Datasheet, PDF (23/148 Pages) Elpida Memory – 2G bits DDR3 SDRAM

EDJ2104BASE, EDJ2108BASE
Output Driver Impedance
RON will be achieved by the DDR3 SDRAM after proper I/O calibration. Tolerance and linearity requirements are
referred to the Output Driver DC Electrical Characteristics table.
A functional representation of the output buffer is shown in the figure Output Driver: Definition of Voltages and
Currents.
RON is defined by the value of the external reference resistor RZQ as follows:
• RON40 = RZQ/6
• RON34 = RZQ/7
The individual pull-up and pull-down resistors (RONPu and RONPd) are defined as follows:
Parameter
Output driver pull-up impedance
Output driver pull-down impedance
Symbol
RONPu
RONPd
Chip in Drive Mode
Output Driver
To
other
circuitry
like
RCV,
...
I_Pu
RON_Pu
RON_Pd
I_Pd
Definition
VDDQ − VOUT
IOUT
VOUT
IOUT
Conditions
RONPd is turned off
RONPu is turned off
VDDQ
DQ
I_Out
V_Out
VSSQ
Output Driver: Definition of Voltages and Currents
Preliminary Data Sheet E1505E20 (Ver. 2.0)
23