Datasheet > G2998

G2998

更新时间： 2024-09-26 01:25:31

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致新 - GMT		双倍数据速率
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描述
DDR Termination Regulator

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中文翻译

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数据手册

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G2998 数据手册

G2998/G2999

Global Mixed-mode Technology

DDR Termination Regulator

low-external component count systems. The G2998/

G2999 maintains a high speed operational amplifier that

provides fast load transient response and only requires

20μF (2 × 10μF) of ceramic output capacitance. The

G2998/G2999 supports remote sensing functions and

all features required to power the DDR I / DDR II / DDR

III / DDR IIIL VTT bus termination according to the

JEDEC specification. In addition, the G2998/ G2999

also has an Enable (EN) pin that provides Suspend to

RAM (STR) functionality. When EN is pulled low, VREF

will remain active, but VTT output will be turned off and

discharged to the ground through internal MOSFETs in

G2998 version and VTT output will be in tri-state in

G2999 version. A power saving advantage can be ob-

tained in this mode through lowering the quiescent cur-

rent to150μA @ VCC=3.3V.

Features

Support and DDR I (1.25VTT), DDR II (0.9 VTT) ,

DDR III (0.75 VTT) , and DDR IIIL (0.675VTT)

Requirements

Input Voltage Range: 3V to 5.5V

VTT_IN Voltage Range: 1.2V to 3.6V

Requires Only 20µF Ceramic Output Capacitance

VTT Pulled Low by 2kΩ Resistor in Stand-By

Mode (G2998 version)

VTT Tri-State in Stand-By Mode

(G2999 version)

Integrated Divider Tracks 1/2 VDDQ for Both

VTT and VREF

Remote Sensing (VTTS)

±20mV Accuracy for VTT

±30mV Accuracy for VREF

Built-In Soft-Start

Over Current Protection

Thermal Shutdown Protection

MSOP-8 and SOP-8(Thermal Pad) Package

The G2998/G2999 is available in the MSOP-8 and

SOP-8 package with the Thermal pad.

Ordering Information

ORDER

NUMBER

G2998P81U

G2998F11U

G2999F11U

TEMP.

RANGE

PACKAGE

(Green)

Applications

MARKING

DDR I/II/III/IIIL Memory Termination

SSTL−2, SSTL−18

G2998

G2999

-40°C~85°C

MSOP-8

SOP-8 (FD)

HSTL Termination

Note: P8: MSOP-8

F1: SOP-8 (FD)

General Description

The G2998/G2999 is a 3A sink/source tracking termi-

nation regulator. It is specifically designed for low-cost/

1: Bonding Code

U: Tape & Reel

Pin Configuration

DDR II

G2998

G2998/G2999

1.8V

VTT_IN

VREF

0.1µF

VTT

VDDQ

VCC

GND

_CC=3.3V

VTTS

VTT

VTT_IN

VCC

VTT_IN

VCC

Thermal

Pad

VTTS

VREF

VTTS

VREF

GND

VDDQ

2 x 10µF

Top View

MSOP- 8

SOP- 8 (FD)

Note: Recommend connecting the Thermal Pad

to the GND for excellent power dis sipation.

Typical Application Circuit

DDR I

DDR III*

2.5V

1.5V

VTT_IN

VDDQ

VCC

VREF

VTT_IN

VREF

0.1µF

VDDQ

VCC

V_CC=3.3V

VTTS

VTT

V_CC=3.3V

VTTS

VTT

GND

2 x 10µF

* Recommended V_CC=3.3V

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 1.5

Nov 22, 2011

中文翻译

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