CXEP3479 CXEP3480是一个3A接收器/源跟踪终端调节器。它专门为低成本/低外部组件计数系统设计。CXEP3479/CXEP3480保持高速运算放大器，提供快速的负载瞬态响应，只需要20μF（2×10μF）的陶瓷输出电容。根据JEDEC规范，CXEP3479 CXEP3480支持遥感功能和驱动DDR I/DDR II/DDR III/DDR iil VTT总线终端所需的所有功能。此外，GCXEP3479 G2CXEP3480lso有一个Enable（EN）管脚，提供了Suspend to RAM（STR）功能。当EN被拉低时，VREF将保持激活，但VTT输出将被关闭，并通过GCXEP3479版本中的内部mosfet放电到地面，VTT输出将在G2CXEP3480版本中处于三态。在这种模式下，通过将静态电流降低到150μA@VCC=3.3V，可以获得省电优势。带有热垫的MSOP-8和SOP-8封装中提供了CXEP3479 CXEP3480。
支持和DDR I（1.25VTT）、DDR II（0.9VTT）、DDR III（0.75VTT）和DDR IIIL（0.675VTT）要求
·输入电压范围：3V至5.5V
电压范围内的VTT:1.2V至3.6V
只需要20μF陶瓷输出电容
在待机模式下，VTT被2kΩ电阻拉低（CXEP3479版本）
·VTT三态待机模式（CXEP3480版本）
·VTT和VREF的集成分隔轨道1/2 VDDQ
·遥感（VTTS）
VTT的±20毫伏精度
VREF的±30mV精度
内置软启动
·过电流保护
热关机保护
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[ CXEP3479 ]
目录
7.相关产品
产品概述 返回TOP
The CXEP3479 CXEP3480 is a 3A sink/source tracking termination regulator. It is specifically designed for low-cost/low-external component count systems. The CXEP3479/ CXEP3480 maintains a high speed operational amplifier that provides fast load transient response and only requires 20μF (2 × 10μF) of ceramic output capacitance. The CXEP3479 CXEP3480 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 GCXEP3479 G2CXEP3480lso 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 GCXEP3479 version and VTT output will be in tri-state in G2CXEP3480 ersion. A power saving advantage can be obtained in this mode through lowering the quiescent current to150μA @ VCC=3.3V. The CXEP3479 CXEP3480 is available in the MSOP-8 and SOP-8 package with the Thermal pad.
产品特点 返回TOP
„ 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 (CXEP3479 version)
„ VTT Tri-State in Stand-By Mode (CXEP3480 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
应用范围 返回TOP
„ DDR I/II/III/IIIL Memory Termination
„ SSTL−2, SSTL−18
„ HSTL Termination
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产品封装图 返回TOP
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DDR Terminator |
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|
Part NO. |
VDDQ (V)min |
VDDQ (V)max |
VCNTL (V) |
Isource (A) |
Isink (A) |
IVREF (mA) |
Isupply (μA) |
Note |
Package |
|
1.2 |
3.6 |
3.3~5.5 |
3 |
3 |
10 |
750 |
DDR3/3L,LPDDR2/3 |
TDFN2X2-10 |
|
|
1.2 |
3.6 |
3~5.5 |
1.8 |
1.8 |
-- |
700 |
DDR1/2/3/3L |
SOP8(FD)/MSOP-8(FD) |
|
|
1.2 |
3.6 |
3.3~5.5 |
3 |
3 |
-- |
750 |
DDR1/2/3/3L |
SOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
2 |
2 |
-- |
1300 |
DDR1/2/3 |
SOT23-5/SOP8/ MSOP8(FD) |
|
|
1.6 |
5.5 |
1.6~5.5 |
1.5 |
1.5 |
0.03 |
280 |
DDR1/2 |
SOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
4~3 |
4~3 |
10 |
800 |
DDR1/2/3/3L |
MSOP10(FD)/MSOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
4~3 |
4~3 |
10 |
900 |
DDR1/2/3/3L |
MSOP8/SOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
4 |
4 |
10 |
900 |
DDR1/2/3 |
SOP8(FD) |
|
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