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.
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[ CXEP3479 ]"
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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) |
|
