W632GU6KB Datasheet, PDF (109/160 Pages) Winbond – 16M X 8 BANKS X 16 BIT DDR3L SDRAM

W632GU6KB
10.8 34 Ohm Output Driver DC Electrical Characteristics
A functional representation of the output buffer is shown in Figure 96. Output driver impedance RON is
selected by bits “D.I.C” A1 and A5 in the MR1 Register. Four different values can be selected via MR1
settings:
RON34 = RZQ / 7 (nominal 34.3 Ω ±10% with nominal RZQ = 240 Ω)
RON40 = RZQ / 6 (nominal 40.0 Ω ±10% with nominal RZQ = 240 Ω)
The individual pull-up and pull-down resistors (RONPu and RONPd) are defined as follows:
RONPu = ^{VDDQ - VOut}
I _Out
under the condition that RONPd is turned off
RONPd = ^VOut
I _Out
under the condition that RONPu is turned off
Chip in Drive Mode
Output Driver
Ipu
VDDQ
RONpu
To other
circuitry
like RCV, ...
RONpd
Ipd
DQ
Iout
Vout
VSSQ
Figure 96 – Output Driver: Definition of Voltages and Currents
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Publication Release Date: Jan. 20, 2015
Revision: A06