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USS810

USB 2.0 Full-Speed/Low-Speed Transceiver

Agere -> LSI Corporation 

USS810 USB 2.0

Full-Speed/Low-Speed Transceiver

Data Sheet, Rev. 6

March 2006

5 Pin Information (continued)

5.1 Pin Descriptions

Table 1. USS810 Pin Description

Symbol

VPU(3.3)

SOFTCON

OE 1

RCV

VP

VM

SUSPND

GND

VDD(I/O)

SPEED

D–

D+

VO

FSE0

VDD

NU

MLCC

Pin

15

16

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Type

Description

— Pull-Up Voltage Source. Connect this pin through an external 1.5 kΩ resistor to D+

(for full-speed operation) or D– (for low-speed operation). This pin’s function is

controlled by the SOFTCON input pin. To ensure zero pull-up current, set

SOFTCON = low to cause VPU(3.3) to float (high impedance); when

SOFTCON = high, VPU(3.3) = 3.3 V.

I Software-Controlled USB Connection. This pin allows USB connect/disconnect

signaling to be controlled by software. A high level on this pin applies 3.3 V to pin

VPU(3.3), which is connected to an external 1.5 kΩ pull-up resistor.

I Output Enable. This active-low pin enables the transceiver to transmit data on the

USB bus.

O Differential Data Receiver. When the SUSPND input is high, this pin is driven low.

The state of RCV is unknown when FSE0 = 1.

O Single-Ended D+ Receiver. The VP pin is used for external detection of single-

ended zero (SE0), error conditions, and speed of connected device.

O Single-Ended D− Receiver. The VM pin is used for external detection of single-

ended zero (SE0), error conditions, and speed of connected device.

I Suspend. When SUSPND is high, it enables a low-power state while the USB is

inactive and drives output RCV to a low level. No dc power is consumed when

SUSPND is high.

P Device Ground.

P Power Supply for Digital I/O. 1.75 V to 3.3 V.

I Speed Selection. This pin adjusts the slew rate of differential data outputs D+ and

D–. Tie this pin low to enable low-speed data transmission (1.5 Mbits/s) and high to

enable full-speed data transmission (12 Mbits/s).

Analog Negative USB Differential Data Bus. If this device is used in a USB peripheral

I/O application, connect an external 24 Ω ± 1% resistor in series with this signal in

order to meet the USB Specification, Rev. 2.0 impedance requirement. Connect

this signal to pin VPU(3.3) via a 1.5 kΩ ± 5% resistor for low-speed USB peripheral

applications.

Analog Positive USB Differential Data Bus. If this device is used in a USB peripheral

I/O application, connect an external 24 Ω ± 1% resistor in series with this signal in

order to meet the USB Specification Rev. 2.0 impedance requirement. Connect this

signal to pin VPU(3.3) via a 1.5 kΩ ± 5% resistor for full-speed USB peripheral appli-

cations.

I Single-Ended Data Input. Refer to Table 3..

I Single-Ended Zero Mode. Refer to Table 3..

P 3.3 V Power Supply. This voltage supply is used for the USB signals D+/D– and the

internal level shifter.

— Not Usable. No external connections to this pin are allowed.

1. Symbol names with an overscore (e.g., NAME) indicate active-low signals.

4

Agere Systems Inc.

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