USB1T1104 Просмотр технического описания (PDF) - Fairchild Semiconductor

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USB1T1104

Universal Serial Bus Peripheral Transceiver with Voltage Regulator

Fairchild Semiconductor 

TABLE 4. Receiver Function (OE = H)

D, D

Differential Logic 1

Differential Logic 0

SE0

Sharing Mode

RCV

Vp

Vm

H

H

L

L

L

H

X

L

L

L

H

H

X = Don’t Care

Power Supply Configurations and Options

The three modes of power supply operation are:

• Normal Mode: Regulated Output

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.

3-STATE and the USB1T1104 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 10 PA) and

VCCIO such that device is in low power (suspended) state.

Pins Vbusmon and RCV are forced LOW as an indication of

this mode with Vbusmon being ignored during this state.

For normal mode the VCCIO is an independent voltage source

(1.65V to 3.6V) that is a function of the external circuit config-

uration.

• Disable Mode: VCCIO is not connected and VCC(5V) is con-

nected. In this mode the D and D pins are 3-STATE and the

device is in low power state.

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

VREG are not connected. In this mode the D and D pins are

A summary of the Supply Configurations is described in Table 5.

Pins

VCC (5V)

VREG (3.3V)

VCCIO

VPU (3.3V)

D, D

Vp, Vm

RCV

OE, SUSPND, Config,

Vpo/Vo, Vmo/FSEO, MODE

Note 5: Hi-Z or forced LOW.

TABLE 5. Power Supply Configuration Options

Power Supply Mode Configuration

Sharing

Disable

Normal (Regulated Output)

 3.6V

Pulled LOW

Regulator OFF

1.65V to 3.6V Source

Connected to 5V Source

3.3V, 300 PA

Regulated Output

Not Connected

Connected to 5V Source

3.3V, 300 PA

Regulated Output

1.65V to 3.6V Source

3-STATE (Off)

3-STATE

H

3-STATE (Off)

3-STATE

Invalid

3.3V Available if

Config = HIGH

Function of

Mode Set Up

Function of

Mode Set Up

L

Invalid

Function of

Mode Set Up

Hi-Z

Hi-Z

Function of

Mode Set Up

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