IS43TR16640C datasheet(40/89 Pages) ISSI

40 / 89 page

IS43/46TR16640C, IS43/46TR16640CL

IS43/46TR81280C, IS43/46TR81280CL

Integrated Silicon Solution, Inc. – www.issi.com –

Rev. E

12/27/2024

5.7

34Ohm Output Driver DC Electrical Characteristics

A Functional representation of the output buffer is shown as below. Output driver impedance RON is defined by the value

ofthe external reference resistor RZQ as follows:

RON34 = RZQ / 7 (nominal 34.4ohms +/-10% with nominal RZQ=240ohms)

The individual pull-up and pull-down resistors (RONPu and RONPd) are defined as follows:

RONPu = [VDDQ-Vout] / | Iout | ------------------- under the condition that RONPd is turned off (1)

RONPd = Vout / | Iout | -------------------------------under the condition that RONPu is turned off (2)

Figure 5.7 Output Driver : Definition of Voltages and Currents

5.7.1 Output Driver DC Electrical Characteristics

DDR3 (assuming 1.5V, RZQ = 240ohms; entire operating temperature range; after proper ZQ calibration)

RONNom

Resistor

Vout

Min

Nom

Max

Unit

Notes

34 ohms

RON34Pd

VOLdc=0.2xVDDQ

0.6

1.1

RZQ/7

1,2,3

VOMdc=0.5xVDDQ

0.9

1.1

RZQ/7

1,2,3

VOHdc =0.8xVDDQ

0.9

1.4

RZQ/7

1,2,3

RON34Pu

VOLdc=0.2xVDDQ

0.9

1.4

RZQ/7

1,2,3

VOMdc=0.5xVDDQ

0.9

1.1

RZQ/7

1,2,3

VOHdc=0.8xVDDQ

0.6

1.1

RZQ/7

1,2,3

40 ohms

RON40Pd

VOLdc=0.2xVDDQ

0.6

1.1

RZQ/6

1,2,3

VOMdc=0.5xVDDQ

0.9

1.1

RZQ/6

1,2,3

VOHdc =0.8xVDDQ

0.9

1.4

RZQ/6

1,2,3

RON40Pu

VOLdc=0.2xVDDQ

0.9

1.4

RZQ/6

1,2,3

VOMdc=0.5xVDDQ

0.9

1.1

RZQ/6

1,2,3

VOHdc=0.8xVDDQ

0.6

1.1

RZQ/6

1,2,3

Mismatch between pull-up and pull-down, MMPuPd

VOMdc= 0.5xVDDQ

-10

+10

1,2,4

VDDQ

VSSQ

RONPu

RONPd

IPu

IPd

Output

Driver

Chip in Drive Mode

Iout

Vout

IS43TR16640C Datasheet(PDF) 40 Page - Integrated Silicon Solution, Inc

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