G2995P1U datasheet(10/12 Pages) GMT

Part #	G2995P1U

Description	DDR Termination Regulator

Download	12 Pages

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Manufacturer	GMT [Global Mixed-mode Technology Inc]

Direct Link	http://www.gmt.com.tw

Logo

10 / 12 page

Ver: 1.7

May 10, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

10

G2995

Global Mixed-mode Technology Inc.

In Figure 5 & 6, they are the application configurations

of DDR-II SDRAM bus terminations. Figure 5 is the

typical application scheme of DDR-II SDRAM. With the

separate VDDQ pin and an internal resistor divider, it

is possible to use the G2995 in applications utilizing

DDR-II memory. Figure 6 is used to increase the driv-

ing capability. The risk is the same as figure 4.

Figure 7 & 8 are used to scale the VTT to the wanted

value when the standard voltages of SSTL-2 do not

meet the requirements. Using R1 & R2, Figure 7 can

shift VTT up to VDDQ/2 * (1+R1/R2) and figure 8 can

shift VTT down to VDDQ/2 * (1-R1/R2).

+

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT

V

DD

C

IN

Figure 7. Increasing VTT by Level Shifting

C

OUT

V

DDQ

R1

R2

+

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT

V

DD

C

IN

Figure 8. Decreasing VTT by Level Shifting

C

OUT

V

DDQ

R1

R2

+

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT

V

DD

C

IN

Figure 7. Increasing VTT by Level Shifting

C

OUT

V

DDQ

R1

R2

+

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT

V

DD

C

IN

Figure 7. Increasing VTT by Level Shifting

C

OUT

V

DDQ

R1

R2

+

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT

V

DD

C

IN

Figure 8. Decreasing VTT by Level Shifting

C

OUT

V

DDQ

R1

R2

+

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT

V

DD

C

IN

Figure 8. Decreasing VTT by Level Shifting

C

OUT

V

DDQ

R1

R2

+

V

REF

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT=0.9V

V

REF=0.9V

V

DDQ=1.8V

AV

IN=1.8V or 5.5V

C

IN

Figure 5. Recommended DDR-II Termination

C

OUT

C

REF

PV

IN=1.8V

+

V

REF

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT=0.9V

V

REF=0.9V

V

DDQ=1.8V

AV

IN=3.3V or 5.5V

C

IN

Figure 6. DDR-II Termination with higher voltage rails

C

OUT

C

REF

PV

IN=3.3V

+

V

REF

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT=0.9V

V

REF=0.9V

V

DDQ=1.8V

AV

IN=1.8V or 5.5V

C

IN

Figure 5. Recommended DDR-II Termination

C

OUT

C

REF

PV

IN=1.8V

+

V

REF

V

DDQ

AV

IN

V

SENSE

PV

IN

V

TT

GND

V

TT=0.9V

V

REF=0.9V

V

DDQ=1.8V

AV

IN=3.3V or 5.5V

C

IN

Figure 6. DDR-II Termination with higher voltage rails

C

OUT

C

REF

PV

IN=3.3V

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