US3277LG-S08-R datasheet(7/10 Pages) UTC

7 / 10 page

US3X77

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

7 of 10

www.unisonic.com.tw

QW-R502-568.D



TYPICAL APPLICATION CIRCUIT

Supply Voltage 5V

Ferrite Beades

1µF

0.1µF

150µF

VBUS

D+

D-

GND

Data

GND

OUT

UTC

US3X77

Chip Enable

RFG

Pull-Up Resistor (10K ~ 100K)

Over -

Current

Flag Transient Filtering

USB

Controller

0.1µF

10K

Note. A low-ESR 150μF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to meet

the 330mV maximum droop requirement in the hub VBUS.

POWER SUPPLY CONSIDERATIONS

A 1μF bypass capacitor on IN pins, a

high value capacitor and a 0.1uF bypass capacitor on OUT pins， are

strongly recommended， because

this precaution can reduce a poor risk that an output short may cause

sufficient ringing on the input to damage internal control circuitry.

Input transients must not exceed the absolute maximum supply voltage (6V) even for a short duration.

ENABLE INPUT

EN must be driven logic high or logic low for a clearly defined input. Floating the input may cause unpredictable

operation. EN should not be allowed to go

negative with respect to GND.

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