K4B4G1646B 데이터 시트보기 (PDF) - Samsung

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K4B4G1646B

4Gb B-die DDR3 SDRAM

Samsung 

K4B4G1646B

datasheet

Rev. 1.0

DDR3 SDRAM

8.4 Differential Input Cross Point Voltage

To guarantee tight setup and hold times as well as output skew parameters with respect to clock and strobe, each cross point voltage of differential input

signals (CK, CK and DQS, DQS) must meet the requirements in below table. The differential input cross point voltage VIX is measured from the actual

cross point of true and complement signal to the mid level between of VDD and VSS.

VDD

CK, DQS

VIX

VIX

VIX

VDD/2

VSEH

VSEL

Figure 4. VIX Definition

CK, DQS

VSS

[ Table 12 ] Cross point voltage for differential input signals (CK, DQS)

Symbol

Parameter

DDR3-800/1066/1333/1600/1866/2133

Min

Max

Unit NOTE

VIX

Differential Input Cross Point Voltage relative to VDD/2 for CK,CK

-150

-175

150

mV

2

175

mV

1

VIX

Differential Input Cross Point Voltage relative to VDD/2 for DQS,DQS

-150

150

mV

2

NOTE :

1. Extended range for VIX is only allowed for clock and if single-ended clock input signals CKand CK are monotonic, have a single-ended swing VSEL / VSEH of at least VDD/2

±250 mV, and the differential slew rate of CK-CK is larger than 3 V/ ns. Refer to Table 11 on page 15 for VSEL and VSEH standard values.

2. The relation between VIX Min/Max and VSEL/VSEH should satisfy following.

(VDD/2) + VIX(Min) - VSEL ≥ 25mV

VSEH - ((VDD/2) + VIX(Max)) ≥ 25mV

8.5 Slew rate definition for Differential Input Signals

See 14.3 “Address/Command Setup, Hold and Derating :” on page 48 for single-ended slew rate definitions for address and command signals.

See 14.4 “Data Setup, Hold and Slew Rate Derating :” on page 54 for single-ended slew rate definitions for data signals.

8.6 Slew rate definitions for Differential Input Signals

Input slew rate for differential signals (CK, CK and DQS, DQS) are defined and measured as shown in Table 13 and Figure 5.

[ Table 13 ] Differential input slew rate definition

Description

Differential input slew rate for rising edge (CK-CK and DQS-DQS)

Measured

From

To

VILdiffmax

VIHdiffmin

Differential input slew rate for falling edge (CK-CK and DQS-DQS)

VIHdiffmin

NOTE :

The differential signal (i.e. CK - CK and DQS - DQS) must be linear between these thresholds.

VILdiffmax

Defined by

VIHdiffmin - VILdiffmax

Delta TRdiff

VIHdiffmin - VILdiffmax

Delta TFdiff

VIHdiffmin

0

VILdiffmax

delta TFdiff

delta TRdiff

Figure 5. Differential Input Slew Rate definition for DQS, DQS, and CK, CK

- 15 -

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