W631GG6KB-15 Datasheet, PDF (109/158 Pages) Winbond – Double Data Rate architecture: two data transfers per clock cycle

W631GG6KB
9.8 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. Two 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 (RON_Pu and RON_Pd) are defined as follows:
RON_Pu = ^{VDDQ - VOut}
I _Out
under the condition that RON_Pd is turned off
RON_Pd = ^VOut
I _Out
under the condition that RON_Pu 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: Feb. 27, 2013
Revision A04