USB1T1103 데이터 시트보기 (PDF) - Fairchild Semiconductor

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USB1T1103

Universal Serial Bus Peripheral Transceiver with Voltage Regulator

Fairchild Semiconductor 

Functional Description

The USB1T1103 transceiver is designed to convert CMOS

data into USB differential bus signal levels and to convert

USB differential bus signal to CMOS data.

To minimize EMI and noise the outputs are edge rate con-

trolled with the rise and fall times controlled and defined for

full speed data rates only (12Mbits/s). The rise, fall times

are balanced between the differential terminals to minimize

skew.

The USB1T1103 differs from earlier USB Transceiver in

that the Vp/Vm and Vpo/Vmo terminals are now I/O terminals

rather than discrete input and output terminals. Table 1

describes the specific terminal functionality selection. Table

2 and Table 3 describe the specific Truth Tables for Driver

and Receiver operating functions.

The USB1T1103 also has the capability of various power

supply configurations, including a disable mode for VCCIO

disconnected, to support mixed voltage supply applications

(see Table 4) and Section 2.1 for detailed descriptions.

Functional Tables

TABLE 1. Function Select

SUSPND

OE

D, D

RCV

Vp/Vpo

Vm/Vmo

Function

L

L

Driving & Active Vpo Input Vmo Input Normal Driving

Receiving

(Differential Receiver Active)

L

H

Receiving Active Vp Output Vm Output Receiving

(Note 1)

H

L

Driving

Inactive Vpo Input Vmo Input Driving during Suspend

(Note 2)

(Differential Receiver Inactive)

H

H

3-STATE Inactive Vp Output Vm Output Low Power State

(Note 1) (Note 2)

Note 1: Signal levels is function of connection and/or pull-up/pull-down resistors.

Note 2: For SUSPND HIGH mode the differential receiver is inactive and the output RCV is forced LOW. The out-of-suspend signaling (K) is detected via

the single-ended receivers of the Vp/Vpo and Vm/Vmo terminals.

TABLE 2. Driver Function (OE L) using Differential Input Interface

Vm/Vmo

L

L

H

H

Vp/Vpo

L

H

L

H

Data (D / D)

SE0 (Note 3)

Differential Logic 1

Differential Logic 0

Illegal State

Note 3: SE0 Single Ended Zero

TABLE 3. Receiver Function (OE H)

D, D

Differential Logic 1

Differential Logic 0

SE0

RCV

H

L

X

Vp/Vpo

H

L

L

Vm/Vmo

L

H

L

X Don’t Care

RCV(0) denotes the signal level on output RCV just prior to the SE0 or SE1 event. This level is stable during the SE0 or SE1 event period.

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