W9751G6KB-25 datasheet(67/87 Pages) WINBOND

Part #	W9751G6KB-25

Description	Double Data Rate architecture: two data transfers per clock cycle

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Manufacturer	WINBOND [Winbond]

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W9751G6KB

Publication Release Date: Sep. 03, 2012

- 67 -

Revision A04

10.14

AC Overshoot / Undershoot Specification

10.14.1 AC Overshoot / Undershoot Specification for Address and Control Pins:

Applies to A0-A12, BA0-BA1, /CS, /RAS, /CAS, /WE, CKE, ODT

PARAMETER

DDR2-1066

DDR2-800

DDR2-667

UNIT

Maximum peak amplitude allowed for overshoot area

0.5

V

Maximum peak amplitude allowed for undershoot area

0.5

V

Maximum overshoot area above VDD

0.5

0.66

0.8

V-nS

Maximum undershoot area below VSS

0.5

0.66

0.8

V-nS

10.14.2 AC Overshoot / Undershoot Specification for Clock, Data, Strobe and Mask pins:

Applies to DQ, LDQS, /LDQS, UDQS, /UDQS, LDM, UDM, CLK, /CLK

PARAMETER

DDR2-1066

DDR2-800

DDR2-667

UNIT

Maximum peak amplitude allowed for overshoot area

0.5

V

Maximum peak amplitude allowed for undershoot area

0.5

V

Maximum overshoot area above VDDQ

0.19

0.23

V-nS

Maximum undershoot area below VSSQ

0.19

0.23

V-nS

Maximum Amplitude

Overshoot Area

Undershoot Area

VDD/VDDQ

Volts (V)

Time (nS)

VSS/VSSQ

Figure 29

– AC overshoot and undershoot definition

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