TUSB2551 datasheet(5/18 Pages) TI

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Power-Supply Input Options

Electrostatic Discharge (ESD)

TUSB2551

ADVANCED UNIVERSAL SERIAL BUS TRANSCEIVER

SCES667 – FEBRUARY 2008

The TUSB2551 has two power-supply input options.

• Internal regulator – V

CC(5.0) is connected to 4 V to 5.5 V. The internal regulator is used to supply the internal

circuitry with 3.3 V (nominal). Vreg(3.3) becomes a 3.3-V output reference.

• Regulator bypass – V

CC(5.0) and Vreg(3.3) are connected to the same supply. The internal regulator is bypassed,

and the internal circuitry is supplied directly from the Vreg(3.3) power supply. The voltage range is

3 V to 3.6 V to comply with the USB specification.

The supply-voltage range for each input option is specified in Table 3.

Table 3. Power-Supply Input Options

INPUT OPTION

VCC(5.0)

Vreg(3.3)

VCC(I/O)

Supply input for internal regulator

Voltage-reference output

Supply input for digital I/O pins

Internal regualtor

(4 V to 5.5 V)

(3.3 V, 300

µA)

(1.4 V to 3.6 V)

Connected to Vreg(3.3) with

Supply input

Supply input for digital I/O pins

Regulator bypass

maximum voltage drop of 0.3 V

(3 V to 3.6 V)

(1.4 V to 3.6 V)

(2.7 V to 3.6 V)

PIN NAME

ESD

TYP

UNIT

IEC61000-4-2, Air-Gap Discharge

±9

D+, D–, VCC(5.0)

IEC61000-4-2, Contact Discharge

±9

Human-Body Model

±15

All other pins

Human-Body Model

±2

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