Philips Semiconductors

ISP1107

Advanced USB transceiver

Objective specification

Rev. 01 — 23 February 2000

4 of 19

9397 750 06899

© Philips Electronics N.V. 2000. All rights reserved.

7.

Functional description

7.1 Function selection

[1]

Signal levels on D

+/D− are determined by other USB devices and external pull-up/down resistors.

[2]

In ‘suspend’ mode (SUSPND = HIGH) the differential receiver is inactive and output RCV is always

LOW. Out-of-suspend (‘K’) signalling is detected via the single-ended receivers VP and VM.

[3]

During suspend, the slew-rate control circuit of low-speed operation is disabled. The D

+/D− are still

driven to their intended states, without slew-rate control. This is permitted because driving during

suspend is used to signal remote wakeup by driving a ‘K’ signal (one transition from idle to ‘K’ state)

for a period of 1 to 15 ms.

GND

8

-

ground supply

9

-

supply voltage for digital I/O pins (1.65 to 3.6 V). Three

voltage levels are supported: 1.8 V

± 0.15 V, 2.5 V ± 0.2 V

and 3.3 V

pins are in three-state

SPEED

10

I

slew rate of differential data outputs D

+ and D− according to

the transmission speed:

LOW: low-speed (1.5 Mbit/s)

HIGH: full-speed (12 Mbit/s)

D

−

11

AI/O

negative USB data bus connection (analog, differential); for

D

+

12

AI/O

positive USB data bus connection (analog, differential); for

VO

13

I

trigger); see Table 4

FSE0

14

I

trigger); see Table 4

15

-

regulated supply voltage output (3.0 to 3.6 V) during 5 V

operation; used as supply voltage input for 3.3 V operation

(3.3 V

± 10%)

16

-

supply voltage for 5 V operation (4.0 to 5.5 V); can be

Table 2:

Symbol

Pin

Type

Description

Table 3:

Function table

SUSPND

OE

D

+/D−

RCV

VP/VM

Function

L

L

driving &

receiving

active

active

normal driving

(differential receiver active)

L

H

receiving [1]

active

active

receiving

H

L

driving

inactive [2]

active

driving during ‘suspend’ [3]

(differential receiver inactive)

H

H

high-Z [1]

inactive [2]

active

low-power state