ISP1521

Hi-Speed Universal Serial Bus hub controller

Rev. 03 -- 24 November 2004

Product data

General description

The ISP1521 is a stand-alone Universal Serial Bus (USB) hub controller IC that
complies with

Universal Serial Bus Specification Rev. 2.0. It supports data transfer at

high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s).

The upstream facing port can be connected to a Hi-Speed USB host or hub or to an
Original USB host or hub. If the upstream facing port is connected to a Hi-Speed USB
host or hub, then the ISP1521 will operate as a Hi-Speed USB hub. That is, it will
support high-speed, full-speed and low-speed devices connected to its downstream
facing ports. If the upstream facing port is connected to an Original USB host or hub,
then the ISP1521 will operate as an Original USB hub. That is, high-speed devices
that are connected to its downstream facing ports will operate in full-speed mode
instead.

The ISP1521 is a full hardware USB hub controller. All Original USB devices
connected to the downstream facing ports are handled using a single Transaction
Translator (TT), when operating in a cross-version environment. This allows the
whole 480 Mbit/s upstream bandwidth to be shared by all the Original USB devices
on its downstream facing ports.

The ISP1521 has seven downstream facing ports. If not used, ports 3 to 7 can be
disabled. The vendor ID, product ID and string descriptors on the hub are supplied by
the internal ROM; they can also be supplied by an external I

C-busTM EEPROM or a

microcontroller.

The ISP1521 is suitable for self-powered hub designs.

An analog overcurrent detection circuitry is built into the ISP1521, which can also
accept digital overcurrent signals from external circuits; for example, Micrel MOSFET
switch MIC2026. The circuitry can be configured to trip on a global or an individual
overcurrent condition.

Each port comes with two status indicator LEDs.

Target applications of the ISP1521 are monitor hubs, docking stations for notebooks,
internal USB hub for motherboards, hub for extending Intel

Easy PCs, hub boxes,

and so on.

Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

Product data

Rev. 03 -- 24 November 2004

2 of 53

9397 750 13702

Features

Complies with:

Universal Serial Bus Specification Rev. 2.0

Advanced Configuration and Power Interface (ACPITM), OnNowTM and USB
power management requirements

Supports data transfer at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and
low-speed (1.5 Mbit/s)

Self-powered capability

USB suspend mode support

Configurable number of ports

Internal power-on reset and low voltage reset circuit

Port status indicators

Integrates high performance USB interface device with hub handler, Philips Serial
Interface Engine (SIE) and transceivers

Built-in overcurrent detection circuit

Individual or ganged power switching, individual or global overcurrent protection,
and non-removable port support by I/O pins configuration

Simple I

C-bus (master/slave) interface to read device descriptor parameters,

language ID, manufacturer ID, product ID, serial number ID and string descriptors
from a dedicated external EEPROM, or to allow the microcontroller to set up hub
descriptors

Visual USB traffic monitoring (GoodLinkTM) for the upstream facing port

Uses 12 MHz crystal oscillator with on-chip Phase-Locked Loop (PLL) for low
ElectroMagnetic Interference (EMI)

Supports temperature range from

C to +70

Available in LQFP80 package.

Applications

Monitor hubs

Docking stations for notebooks

Internal hub for USB motherboards

Hub for extending Easy PCs

Hub boxes.

Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

Product data

Rev. 03 -- 24 November 2004

3 of 53

9397 750 13702

Abbreviations

ACPI -- Advanced Configuration and Power Interface

EMI -- ElectroMagnetic Interference

ESD -- ElectroStatic Discharge

NAK -- Not AcKnowledge

PID -- Packet IDentifier

PLL -- phase-Locked Loop

SIE -- Serial Interface Engine

TT -- Transaction Translator

USB -- Universal Serial Bus.

Ordering information

Table 1:

Ordering information

Type number

Package

Name

Description

Version

ISP1521BE

LQFP80 plastic low profile quad flat package; 80 leads; body

1.4 mm

SOT315-1

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Philips Semiconductor

ISP1521

Hi-Speed USB hub contr

oller

9397 750 13702

Š K

oninklijk

e Philips Electronics N.V

. 2004. All r

ights reser

ed.

Pr
oduct data

Re
v

.
03 -- 24 No

vember 2004

4 of 53

Bloc

k dia

gram

Fig 1.

Block diagram.

MLD710

C-BUS

CONTROLLER

POWER

SWITCH

OVERCURRENT

DETECTION

LINK LEDS

BIT CLOCK

RECOVERY

PLL

ANALOG

TRANSCEIVER

ˇ ORIGINAL USB
ˇ HI-SPEED USB

ROUTING LOGIC

PHILIPS PIE

PHILIPS SIE

PORT

CONTROLLER

HUB

CONTROLLER

RAM

ROM

MINI-HOST

CONTROLLER

HUB REPEATER
ˇ ORIGINAL USB

ˇ HI-SPEED USB

ANALOG TRANSCEIVER

ˇ ORIGINAL USB
ˇ HI-SPEED USB

TRANSACTION

TRANSLATOR

VCC1

RPU

DM0

DP0

SDA

ADOC

NOOC

SUSPEND

SCL

C-bus

12 MHz

upstream port 0

XTAL1

XTAL2

RREF

VCC2

VCC3

VCC4

VREF(5V0)

POWER

SWITCH

OVERCURRENT

DETECTION

ANALOG

TRANSCEIVER

ˇ ORIGINAL USB
ˇ HI-SPEED USB

downstream

port 1

downstream

port 2 to port 6

downstream

port 7

DM7

DM1

DP1

OC1_N

PSW1_N

GRN1_N

AMB1_N

DP7

ISP1521

OC7_N

PSW7_N

GRN7_N

AMB7_N

11, 50

17, 56

30, 70

13, 52

31, 69

GND

2, 6, 8,
12, 14,
18, 29,
44, 47,
51, 53,
57, 71

RESET_N

HUBGL_N

PORT 1

PORT 2 to 6

PORT 7

Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

Product data

Rev. 03 -- 24 November 2004

5 of 53

9397 750 13702

Pinning information

7.1 Pinning

7.2 Pin description

Fig 2.

Pin configuration.

ISP1521BE

MLD712

SDA

SCL

HUBGL_N

AMB5_N

GRN5_N

AMB6_N

GRN6_N

AMB1_N

GRN1_N

GND

CC3

REF(5V0)

AMB2_N

GRN2_N

AMB7_N

GRN7_N

AMB3_N

GRN3_N

AMB4_N

GRN4_N

TEST_LOW

TEST_HIGH

OC1_N

PSW1_N

OC6_N

PSW6_N

OC5_N

PSW5_N

GND

CC3

REF(5V0)

OC4_N

PSW4_N

OC3_N

PSW3_N

OC7_N

PSW7_N

OC2_N

PSW2_N

RESET_N

SUSPEND

GND

DM0

DP0

RPU

GND

RREF

GND

DM5

DP5

CC1

GND

CC4

GND

DM6

DP6

CC2

GND

DM1

DP1

NOOC

DP4

DM4

GND

CC2

DP3

DM3

GND

CC4

GND

CC1

DP7

DM7

GND

DP2

DM2

GND

XTAL2

XTAL1

ADOC

Table 2:

Pin description

[1]

Symbol

[2]

Pin

Type Description

SUSPEND

suspend indicator output; a HIGH level indicates that the hub is
in the suspend mode

GND

ground supply

DM0

AI/O

upstream facing port 0 D

connection (analog)

Part Number ISP1521

Document Outline