AS4C64M32MD2-25BCN datasheet(95/129 Pages) ALSC

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8.7.1

RONPU and RONPD Characteristics with ZQ Calibration

Output driver impedance RON is defined by the value of the external reference resistor RZQ. Nominal RZQ is 240

Ω.

Table 38 — Output Driver DC Electrical Characteristics with ZQ Calibration

RONNOM

Resistor

Vout

Min

Nom

Max

Unit

Notes

34.3

Ω

RON34PD

0.5 x VDDQ

0.85

1.00

1.15

RZQ/7

1,2,3,4

RON34PU

0.5 x VDDQ

0.85

1.00

1.15

RZQ/7

1,2,3,4

40.0

Ω

RON40PD

0.5 x VDDQ

0.85

1.00

1.15

RZQ/6

1,2,3,4

RON40PU

0.5 x VDDQ

0.85

1.00

1.15

RZQ/6

1,2,3,4

48.0

Ω

RON48PD

0.5 x VDDQ

0.85

1.00

1.15

RZQ/5

1,2,3,4

RON48PU

0.5 x VDDQ

0.85

1.00

1.15

RZQ/5

1,2,3,4

60.0

Ω

RON60PD

0.5 x VDDQ

0.85

1.00

1.15

RZQ/4

1,2,3,4

RON60PU

0.5 x VDDQ

0.85

1.00

1.15

RZQ/4

1,2,3,4

80.0

Ω

RON80PD

0.5 x VDDQ

0.85

1.00

1.15

RZQ/3

1,2,3,4

RON80PU

0.5 x VDDQ

0.85

1.00

1.15

RZQ/3

1,2,3,4

120.0

Ω

RON120PD

0.5 x VDDQ

0.85

1.00

1.15

RZQ/2

1,2,3,4

(Optional)

RON120PU

0.5 x VDDQ

0.85

1.00

1.15

RZQ/2

1,2,3,4

Mismatch between

MMPUPD

-15.00

15.00

1,2,3,4,5

Pull-up and Pull-down

NOTE 1 Across entire operating temperature range, after calibration.

NOTE 2 RZQ = 240

NOTE 3 The tolerance limits are specified after calibration with fixed voltage and temperature. For behavior of the tolerance limits if

temperature or voltage changes after calibration, see following section on voltage and temperature sensitivity.

NOTE 4 Pull-down and pull-up output driver impedances are recommended to be calibrated at 0.5 x VDDQ.

NOTE 5 Measurement definition for mismatch between pull-up and pull-down, MMPUPD: Measure RONPU and RONPD, both at 0.5 x VDDQ:

For example, with MMPUPD(max) = 15% and RONPD = 0.85, RONPU must be less than 1.0.

AS4C64M32MD2-25BCN

AS4C128M16MD2-25BCN

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AS4C64M32MD2-25BCN Datasheet(PDF) 95 Page - Alliance Semiconductor Corporation

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