Rev. 0.8 / Oct. 2007

12

3.2 DC & AC Logic Input Levels

3.2.1 Input DC Logic Level

3.2.2 Input AC Logic Level

3.2.3 AC Input Test Conditions

Note:

under test.

3. AC timings are referenced with input waveforms switching from VIL(ac) to VIH(ac) on the positive transitions

and VIH(ac) to VIL(ac) on the negative transitions.

Symbol

Parameter

Min.

Max.

Units

Notes

dc input logic high

VREF + 0.125

VDDQ + 0.3

V

dc input logic low

- 0.3

VREF - 0.125

V

Symbol

Parameter

DDR2 400,533

DDR2 667,800

Units

Notes

Min.

Max.

Min.

Max.

ac input logic high

VREF +

0.250

-

VREF +

0.200

-V

ac input logic low

-

VREF - 0.250

-

VREF - 0.200

V

Symbol

Condition

Value

Units

Notes

Input reference voltage

V1

Input signal maximum peak to peak swing

1.0

V

1

SLEW

Input signal minimum slew rate

1.0

V/ns

2, 3

delta TR

delta TF

Rising Slew =

delta TR

delta TF

Falling Slew =

< Figure : AC Input Test Signal Waveform>