USB1T1103MHX(2007) Просмотр технического описания (PDF) - Fairchild Semiconductor

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USB1T1103MHX
(Rev.:2007)

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

controlled 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 ter-

minals to minimize skew.

The USB1T1103 differs from earlier USB Transceiver in

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

nals 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 (1)

Active

Vp Output Vm Output Receiving

H

L

Driving

Inactive(2)

Vpo Input

Vmo Input Driving during Suspend

(Differential Receiver Inactive)

H

H

3 STATE(1)

Inactive(2)

Vp Output

Vm Output Low Power State

Notes:

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

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

Notes:

3. SE0 = Single Ended Zero

Vp/Vpo

L

H

L

H

Data (D+ / D-)

SE0 (3)

Differential Logic 1

Differential Logic 0

Illegal State

Table 3. Receiver Function (OE = H)

D+, D-

RCV

Vp/Vpo

Vm/Vmo

Differential Logic 1

H

H

L

Differential Logic 0

L

L

H

SE0

X

L

L

Notes:

4. X = Don't Care

5. 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.

© 2005 Fairchild Semiconductor Corporation

USB1T1103 Rev. 1.0.3

4

www.fairchildsemi.com

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