K4B4G0446B Datasheet, PDF (21/59 Pages) Samsung semiconductor – DDP 4Gb B-die DDR3 SDRAM Specification

K4B4G0446B
K4B4G0846B
DDP 4Gb DDR3 SDRAM
9.7 34 ohm Output Driver DC Electrical Characteristics
A functional representation of the output buffer is shown below. Output driver impedance RON is defined by the value of external reference resistor RZQ
as follows:
RON₃₄ = RZQ/7 (Nominal 34ohms +/- 10% with nominal RZQ=240ohm)
RON₄₀ = RZQ/6 (Nominal 40ohms +/- 10% with nominal RZQ=240ohm)
The individual Pull-up and Pull-down resistors (RONpu and RONpd) are defined as follows
RONpu =
V_DDQ-V_OUT
l Iout l
under the condition that RONpd is turned off
RONpd =
V_OUT
l Iout l
under the condition that RONpu is turned off
Output Driver : Definition of Voltages and Currents
Output Driver
Ipu
V_DDQ
To
other
circuity
RON
Pu
RON
Pd
Ipd
DQ
Iout
Vout
V_SSQ
Figure 11. Output Driver : Definition of Voltages and Currents
[ Table 22 ] Output Driver DC Electrical Characteristics, assuming RZQ=240 ohms ;
entire operating temperature range; after proper ZQ calibration
RONnom
Resistor
Vout
Min
Nom
Max
V_OLdc = 0.2 x V_DDQ
0.6
1.0
1.1
RON34pd
V_OMdc = 0.5 x V_DDQ
0.9
1.0
1.1
34Ohms
V_OHdc = 0.8 x V_DDQ
0.9
1.0
1.4
V_OLdc = 0.2 x V_DDQ
0.9
1.0
1.4
RON34pu
V_OMdc = 0.5 x V_DDQ
0.9
1.0
1.1
V_OHdc = 0.8 x V_DDQ
0.6
1.0
1.1
V_OLdc = 0.2 x V_DDQ
0.6
1.0
1.1
RON40pd
V_OMdc = 0.5 x V_DDQ
0.9
1.0
1.1
40Ohms
V_OHdc = 0.8 x V_DDQ
0.9
1.0
1.4
V_OLdc = 0.2 x V_DDQ
0.9
1.0
1.4
RON40pu
V_OMdc = 0.5 x V_DDQ
0.9
1.0
1.1
V_OHdc = 0.8 x V_DDQ
0.6
1.0
1.1
Mismatch between Pull-up and Pull-down,
MMpupd
V_OMdc = 0.5 x V_DDQ
-10
10
Units
RZQ/7
RZQ/6
%
Notes
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,4
Note :
1. The tolerance limits are specified after calibration with stable voltage and temperature. For the behavior of the tolerance limits if temperature or voltage changes after calibra-
tion, see following section on voltage and temperature sensitivity
2. The tolerance limits are specified under the condition that V_DDQ = V_DD and that V_SSQ = V_SS
3. Pull-down and pull-up output driver impedance are recommended to be calibrated at 0.5 X V_DDQ. Other calibration schemes may be used to achieve the linearity spec shown
above, e.g. calibration at 0.2 X V_DDQ and 0.8 X V_DDQ
4. Measurement definition for mismatch between pull-up and pull-down, MMpupd: Measure RONpu and RONpd. both at 0.5 X V_DDQ:
RONpu - RONpd
MMpupd =
x 100
RONnom
Page 21 of 59
Rev. 1.0 March 2009