DDR SDRAM

DDR SDRAM 1Gb M-die (x4, x8) Pb-Free

Revision 1.1 October, 2004

AC Operating Conditions

Parameter/Condition

Symbol

Min

Max-10

Unit

Note

Input High (Logic 1) Voltage, DQ, DQS and DM signals

VIH(AC)

VREF + 0.31

V

Input Low (Logic 0) Voltage, DQ, DQS and DM signals.

VIL(AC)

VREF - 0.31

V

Input Differential Voltage, CK and /CK inputs

VID(AC)

0.7

VDDQ+0.6

V

1

Input Crossing Point Voltage, CK and /CK inputs

VIX(AC)

0.5*VDDQ-0.2

0.5*VDDQ+0.2

V

2

AC Overshoot/Undershoot specification for Address and Control Pins

Parameter

Specification

DDR333

DDR200/266

Maximum peak amplitude allowed for overshoot

TBD

1.5 V

Maximum peak amplitude allowed for undershoot

TBD

1.5 V

The area between the overshoot signal and VDD must be less than or equal to

TBD

4.5 V-ns

The area between the undershoot signal and GND must be less than or equal to

TBD

4.5 V-ns

5

4

3

2

1

0

-1

-2

-3

-4

-5

0

0.5

0.6875

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.3125

6.5

7.0

VDD

Overshoot

Maximum Amplitude = 1.5V

Area = 4.5V-ns

Maximum Amplitude = 1.5V

undershoot

GND

Tims(ns)

AC overshoot/Undershoot Definition

Notes :

1. VID is the magnitude of the difference between the input level on CK and the input level on /CK.

2. The value of VIX is expected to equal 0.5*VDDQ of the transmitting device and must track variations in the dc level of the same.