USB1T1103MPX Просмотр технического описания (PDF) - Fairchild Semiconductor

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USB1T1103MPX

Universal Serial Bus Peripheral Transceiver with Voltage Regulator

Fairchild Semiconductor 

Power Supply Configurations and Options

The three modes of power supply operation are:

• Normal Mode: Regulated Output and Regulator Bypass

1. Regulated Output: VCCIO is connected and VCC(5.0)

is connected to 5V (4.0V to 5.5V) and the internal

voltage regulator then produces 3.3V for the USB

connections.

2. Internal Regulator Bypass Mode: VCCIO is con-

nected and both VCC(5.0) and VREG(3.3) are con-

nected to a 3.3V source (3.0V to 3.6V).

In both cases for normal mode the VCCIO is an indepen-

dent voltage source (1.65V to 3.6V) that is a function of

the external circuit configuration.

• Sharing Mode: VCCIO is only supply connected. VCC and

VREG are not connected. In this mode the D and D ter-

minals are 3-STATE and the USB1T1103 allows external

signals up to 3.6V to share the D and D bus lines.

Internally the circuitry limits leakage from D and D ter-

minals (maximum 10 PA) and VCCIO such that device is

in low power (suspended) state. Terminals Vbusmon

and RCV are forced LOW as an indication of this mode

with Vbusmon being ignored during this state.

• Disable Mode: VCCIO is not connected. VCC is con-

nected, or VCC and VREG are connected. 0V to 3.3V in

this mode D and D are 3-STATE and VPU is HIGH

Impedance (switch is turned off). The USB1T1103 allows

external signals up to 3.6V to share the D and D bus

lines. Internally the circuitry limits leakage from D and

D pins (maximum 10PA).

A summary of the Supply Configurations is described in

Table 4.

TABLE 4. Power Supply Configuration Options

Terminals

VCC (5V)

VREG (3.3V)

VCCIO

VPU (3.3V)

D, D

Vp/Vpo, Vm/Vmo

RCV

Vbusmon

OE, SUSPND, Config

Disable

Connected to 5V

source

3.3V, 300PA

Regulated Output

d0.5V

3-STATE (off)

3-STATE (off)

Invalid [I]

Invalid [I]

Invalid [I]

Hi-Z

Power Supply Mode Configuration

Sharing

Normal (Regulated

Output)

Not Connected

or

3.6V

Connected to 5V

Source

Not Connected

1.65V to 3.6V Source

3-STATE (Off)

3-STATE

L

L

L

Hi-Z

3.3V, 300 PA

Regulated Output

1.65V to 3.6V Source

3.3V Available if

Config HIGH

Function of

Mode Set Up

Function of

Mode Set Up

Function of

Mode Set Up

Function of

Mode Set Up

Function of

Mode Set Up

Normal (Regulator

Bypass)

Connected to VREG

(3.3V)

[Max Drop of 0.3V]

(2.7V to 3.6V)

Connected to 3.3V

Source

1.65V to 3.6V Source

3.3V Available if

Config HIGH

Function of

Mode Set Up

Function of

Mode Set Up

Function of

Mode Set Up

Function of

Mode Set Up

Function of

Mode Set Up

Invalid [I] I/O are to be 3-STATE, outputs to be LOW.

5

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