K4B2G1646C-HCF8000 Datasheet, PDF(19/64 Page) Samsung semiconductor – 2Gb C-die DDR3 SDRAM Only x16 96FBGA with Lead-Free & Halogen-Free (RoHS compliant)

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K4B2G1646C-HCF8000 Datasheet, PDF (19/64 Pages) Samsung semiconductor – 2Gb C-die DDR3 SDRAM Only x16 96FBGA with Lead-Free & Halogen-Free (RoHS compliant)

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K4B2G1646C

datasheet

Rev. 1.11

DDR3 SDRAM

9.7 34ohm 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 34.3ohms +/- 10% with nominal RZQ=240ohm)

The individual Pull-up and Pull-down resistors (RONpu and RONpd) are defined as follows

RONpu =

VDDQ-VOUT

l Iout l

under the condition that RONpd is turned off

RONpd =

VOUT

l Iout l

under the condition that RONpu is turned off

Output Driver

Ipu

VDDQ

other

circuity

RON Pu

RON Pd

Ipd

Iout

Vout

VSSQ

Figure 11. Output Driver : Definition of Voltages and Currents

[ Table 22 ] Output Driver DC Electrical Characteristics, assuming RZQ=240ohms ;

entire operating temperature range ; after proper ZQ calibration

RONnom

Resistor

Vout

Min

Nom

Max

VOLdc = 0.2 x VDDQ

0.6

1.0

1.1

RON34pd

VOMdc = 0.5 x VDDQ

0.9

1.0

1.1

34Ohms

VOHdc = 0.8 x VDDQ

0.9

1.0

1.4

VOLdc = 0.2 x VDDQ

0.9

1.0

1.4

RON34pu

VOMdc = 0.5 x VDDQ

0.9

1.0

1.1

VOHdc = 0.8 x VDDQ

0.6

1.0

1.1

VOLdc = 0.2 x VDDQ

0.6

1.0

1.1

RON40pd

VOMdc = 0.5 x VDDQ

0.9

1.0

1.1

40Ohms

VOHdc = 0.8 x VDDQ

0.9

1.0

1.4

VOLdc = 0.2 x VDDQ

0.9

1.0

1.4

RON40pu

VOMdc = 0.5 x VDDQ

0.9

1.0

1.1

VOHdc = 0.8 x VDDQ

0.6

1.0

1.1

Mismatch between Pull-up and Pull-down,

MMpupd

VOMdc = 0.5 x VDDQ

-10

Units

RZQ/7

RZQ/6

NOTE

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 VDDQ = VDD and that VSSQ = VSS

3. Pull-down and pull-up output driver impedance are recommended to be calibrated at 0.5 X VDDQ. Other calibration schemes may be used to achieve the linearity spec shown

above, e.g. calibration at 0.2 X VDDQ and 0.8 X VDDQ

4. Measurement definition for mismatch between pull-up and pull-down, MMpupd: Measure RONpu and RONpd. both at 0.5 X VDDQ:

RONpu - RONpd

MMpupd =

x 100

RONnom

- 19 -

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