产品概述 返回TOPufp嘉泰姆

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TOPufp嘉泰姆

„ Support and DDR I (1.25VTT), DDR II (0.9 VTT) , DDR III (0.75 VTT) , and DDR IIIL (0.675VTT) Requirements ufp嘉泰姆

„ Input Voltage Range: 3V to 5.5V ufp嘉泰姆

„ VTT_IN Voltage Range: 1.2V to 3.6V ufp嘉泰姆

„ Requires Only 20μF Ceramic Output Capacitance ufp嘉泰姆

„ VTT Pulled Low by 2kΩ Resistor in Stand-By Mode (CXEP3479 version) ufp嘉泰姆

„ VTT Tri-State in Stand-By Mode (CXEP3480 version) ufp嘉泰姆

„ Integrated Divider Tracks 1/2 VDDQ for Both VTT and VREF ufp嘉泰姆

„ Remote Sensing (VTTS) ufp嘉泰姆

„ ±20mV Accuracy for VTT ufp嘉泰姆

„ ±30mV Accuracy for VREF ufp嘉泰姆

„ Built-In Soft-Start ufp嘉泰姆

„ Over Current Protection ufp嘉泰姆

„ Thermal Shutdown Protection ufp嘉泰姆

„ MSOP-8 and SOP-8(Thermal Pad) Packageufp嘉泰姆

   应用范围 返回TOPufp嘉泰姆

„ DDR I/II/III/IIIL Memory Termination ufp嘉泰姆

„ SSTL−2, SSTL−18 ufp嘉泰姆

„ HSTL Terminationufp嘉泰姆

   技术规格书（产品PDF) 返回TOP ufp嘉泰姆

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