TUSB2551APW datasheet(3/20 Pages) TI

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FUNCTIONAL DESCRIPTION

TUSB2551A

www.ti.com...................................................................................................................................................................................................... SCES790 – JUNE 2009

TERMINAL FUNCTIONS

TERMINAL

NO.

I/O

DESCRIPTION

NAME

RGT

System interface supply voltage. Used to provide reference supply voltage for system I/O interface

VCC(I/O)

signaling.

Speed. Edge-rate control: A logic HIGH operates at edge rates for full-speed operation. A logic LOW

SPEED

operates at edge rates for low-speed operation.

RCV

Receive data. Output for USB differential data.

If OE = 1, VP = Receiver output (+)

I/O

If OE = 0, VP = Driver input (+)

If OE = 1, VM = Receiver output (–)

I/O

If OE = 0, VM = Driver input (–)

SOFTCON

Soft connect. Controls state of VPU(3.3). See VPU(3.3) pin description for details.

GND

Ground reference

SUSPEND

Suspend. Active high. Turns off internal circuits to reduce supply current.

8, 16

No internal connection

Output enable. Active low. Enables the transceiver to transmit data onto the bus. When inactive, the

transceiver is in the receive mode.

D–, D+

10, 11

I/O

Differential data lines conforming to the USB standard

3.3-V reference supply. Requires a minimum 0.1-

µF decoupling capacitor for stability. A 1-µF capacitor is

Vreg(3.3)

recommended.

Pullup supply voltage. Used to connect 1.5-k

Ω pullup speed detect resistor.

VPU(3.3)

If SOFTCON = 1, VPU(3.3) is high impedance. If SOFTCON = 0, VPU(3.3) = 3.3 V.

VCC(5.0)

USB bus supply voltage. Used to power USB transceiver and internal circuitry.

FUNCTION SELECTION

SUSPEND

D+, D–

RCV

VP, VM

FUNCTION

Driving

Active

Normal transmit mode

Receiving

Active

Normal receive mode

Hi-Z

Not active

Low power state

Hi-Z

Active

Receiving during suspend (low power state)(1)

(1)

During suspend, VP and VM are active to detect out-of-band signaling conditions.

TRUTH TABLE DURING NORMAL MODE

OE = 0

INPUT

OUTPUT

RESULT

D+

D–

RCV

X(1)

SE0

Logic 0

Logic 1

X(1)

Undefined

OE = 1

INPUT

OUTPUT

RESULT

D+

D–

RCV

X(1)

SE0

Logic 0

Logic 1

X(1)

Undefined

(1)

X = Undefined

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