AS4C64M8D2 datasheet(21/59 Pages) ALSC

21 / 59 page

AS4C64M8D2

Confidential

Rev. 1.0

Feb. /2014

Table 16. Input logic level (VDD = 1.8V  0.1V, TOPER = 0~95 C)

Symbol

Parameter

-25/3

Unit

Min.

Max.

VIH (DC)

DC Input logic High Voltage

VREF + 0.125

VDDQ + 0.3

VIL (DC)

DC Input Low Voltage

- 0.3

VREF - 0.125

VIH (AC)

AC Input High Voltage

VREF + 0.2

VDDQ + Vpeak

VIL (AC)

AC Input Low Voltage

VSSQ - Vpeak

VREF - 0.2

VID (AC)

AC Differential Voltage

0.5

VDDQ

VIX (AC)

AC Differential cross point Voltage

0.5 x VDDQ - 0.175 0.5 x VDDQ + 0.175

NOTE1: Refer to Overshoot/undershoot specification for Vpeak value: maximum peak amplitude allowed for

overshoot and undershoot.

Table 17. AC Input test conditions (VDD = 1.8V  0.1V, TOPER = 0~95 C)

Symbol

Parameter

Value

Unit

Note

VREF

Input reference voltage

0.5 x VDDQ

VSWING(max) Input signal maximum peak to peak swing

1.0

Slew Rate Input signal minimum slew rate

1.0

V/ns

2, 3

NOTE1: Input waveform timing is referenced to the input signal crossing through the VIH /IL (ac) level applied to the

device under test.

NOTE2: The input signal minimum slew rate is to be maintained over the range from VREF to VIH(ac) min for rising

edges and the range from VREF to VIL (ac) max for falling edges .

NOTE3: 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.

Table 18. Differential AC output parameters (VDD = 1.8V  0.1V, TOPER = 0~95 C)

Symbol

Parameter

Value

Unit

Note

Min.

Max.

Vox(ac)

AC Differential Cross Point Voltage

0.5xVDDQ-0.125

0.5xVDDQ+0.125

NOTE1: The typical value of VOX (ac) is expected to be about 0.5 x VDDQ of the transmitting device and VOX (ac) is

expected to track variations in VDDQ. VOX (ac) indicates the voltage at which differential output signals must

cross.

Table 19. AC overshoot/undershoot specification for address and control pins

(A0-A12, BA0-BA1, CS#, RAS#, CAS#, WE#, CKE, ODT)

Parameter

-25

-3

Unit

Maximum peak amplitude allowed for overshoot area

0.5

Maximum peak amplitude allowed for undershoot area

0.5

Maximum overshoot area above VDD

0.66

0.8

V-ns

Maximum undershoot area below VSS

0.66

0.8

V-ns

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