USB2504/USB2504A
Integrated USB 2.0
Compatible 4-Port Hub
PRODUCT FEATURES
Integra ted USB 2.0 Compatible 4-Port Hub
— 4 Transaction Translators for highest performance
— High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and
Low-Speed (1.5Mbits/s) compatible
— Full power management with per port or ganged
selectable power control
— Detects Bus-Power/Self-Power source and changes
mode automatically
Co mplete USB Specification 2.0 Compatibility
— Includes USB 2.0 Transceivers
VID/PID/DID, and Port Configuration for Hub via:
— Single Serial I2C EEPROM
— SMBus Slave Port
De fault VID/PID/DID, allows functionality when
configuration EEPROM is absent
Ha rdware Strapping options allow for configuration
without an external EEPROM or SMBus Host
,
Data Brief
On-Boa rd 24MHz Crystal Driver Circuit or 24 MHz
external clock driver
Interna l PLL for 480MHz USB 2.0 Sampling
Interna l 1.8V Linear Voltage Regulator
Integ rated USB termination and Pull-up/Pull-down
resistors
Interna l Short Circuit protection of USB differential
signal pins
1 .8 Volt Low Power Core Operation
3 .3 Volt I/O with 5V Input Tolerance
6 4-Pin TQFP lead-free RoHS compliant package
SMSC USB2504/USB2504A PRODUCT PREVIEW Revision 2.3 (08-27-07)
Integrated USB 2.0 Compatible 4-Port Hub
ORDER NUMBERS:
USB2504/USB2504A-JT FOR 64 PIN TQFP LEAD-FREE ROHS COMPLIANT PACKAGE
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
Copyright © 2007 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a mean s of illustrating typical applications. Conse quently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
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Revision 2.3 (08-27-07) 2 SMSC USB2504/USB2504A
PRODUCT PREVIEW
Integrated USB 2.0 Compatible 4-Port Hub
General Description
The SMSC 4-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host
as a Full-Speed Hub or as a Full-/High-Speed Hub. The 4-Port Hub supports Low-Speed, Full-Speed,
and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled
downstream ports.
A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture
ensures maximum USB throughput for each connected device when operating with mixed-speed
peripherals.
The Hub works with an external USB power distribution switch device to control V
downstream ports, and to limit current and sense over-current conditions.
All required resistors on the USB ports are integrated into the Hub. This includes all seri es termination
resistors on D+ and D– pins and all require d pull-down and pull-up resistors on D+ and D– pins. The
over-current sense inputs for the downstream facing ports have internal pull-up resistors.
Throughout this document the upstream facing port of the hub will be referred to as the upstream port,
and the downstream facing ports will be called the downstream ports.
OEM Selectable Features
A default configuration is available in the USB2504/USB2504A following a reset. This configuration
may be sufficient for some applications. Strapping option pins make it possible to modify a limited subset of the configuration options.
The USB2504/USB2504A may also be configured by an external EEPROM o r a microcontroller. When
using the microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pinstrapped for external EEPROM configuration but no external EEPROM is present, then a value of ‘0’
will be written to all configuration data bit fields (the hub will attach to the host with all ‘0’ values).
The 4-Port Hub supports several OEM selectable features:
Operation as a Self-Powered USB Hub or as a Bus-Powered USB Hub.
Operation as a Dynamic-Powered Hub (Hub operates as a Bus-Po wered device if a local power
source is not available and switches to Self-Powered opera tion when a local power source is
available).
Multiple Transaction Translator (Multi-TT) or Single-TT support.
Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from
an external SMBus Host.
Port power switching on an individual or ganged basis.
Port over-current monitoring on an individual or ganged basis.
LED indicator support.
Compound device support (port is permanently hardwired to a downstream USB peripheral device ).
Hardware strapping options enable configuration of the following features.
Non-Removable Ports
Port Power Polarity (active high or active low logic)
Port Disable
LED support
MTT enable
Ganged Vs Port power switching and over-current sensing
switching to
BUS
SMSC USB2504/USB2504A 3 Revision 2.3 (08-27-07)
PRODUCT PREVIEW
Block Diagram
Upstream
USB Data
Upstream
V
BUS
24 MHz
Crystal
3.3V
1.8V
Cap
Pin
Strapping
Options
Integrated USB 2.0 Compatible 4-Port Hub
To
EEPROM
or SMBus
Master
SCLSD
V
Upstream
PHY
Repeater
Downstream
PHY #1
Downstream
USB DataOCSense
Power
Detect
Figure 1 4-Port Block Diagram
BUS
PLL
Routing Logic
Port #1
OC Sense
Switch Driver
LED Drivers
Switch/LED
Drivers
1.8V
Reg.
SIE
TT#1TT#2TT#3TT
...
Downstream
#4
Downstream
PHY #4
USB DataOCSense
Internal
Defaults
Select
Controller
Port
Controller
Port #4
OC Sense
Switch Driver
LED Drivers
Serial
Interface
Switch/LED
Drivers
Revision 2.3 (08-27-07) 4 SMSC USB2504/USB2504A
PRODUCT PREVIEW
Integrated USB 2.0 Compatible 4-Port Hub
Package Outline
Figure 2 64 Pin TQFP Package Ou tline (10x10x1.4 mm body - 2 mm footprint)
Table 1 64 Pin TQFP Package Parameters
MIN NOMINAL MAX REMARKS
A ~ ~ 1.60 Overall Package Height
A1 0.05 ~ 0.15 Standoff
A2 1.35 ~ 1.45 Body Thickness
D 11.80 ~ 12.20 X Span
D1 9.80 ~ 10.20 X body Size
E 11.80 ~ 12.20 Y Span
E1 9.80 ~ 10.20 Y body Size
H 0.09 ~ 0.20 Lead Frame Thickness
L 0.45 0.60 0.75 Lead Foot Length
L1 ~ 1.00 ~ Lead Length
e 0.50 Basic Lead Pitch
q0
W 0.17 0.22 0.27 Lead Width
R1 0.08 ~ ~ Lead Shoulder Radius
R2 0.08 ~ 0.20 Lead Foot Radius
ccc ~ ~ 0.08 Coplanarity
o
Notes:
1. Controlling Unit: millimeter.
2. Tolerance on the true position of the leads is ± 0.04 mm maximum.
3. Package body dimensions D1 and E1 do not include the mold protrusion.
Maximum mold protrusion is 0.25 mm per side.
4. Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane.
5. Details of pin 1 identifier are optional but must be located within the zone indicated.
~7
o
Lead Foot Angle
SMSC USB2504/USB2504A 5 Revision 2.3 (08-27-07)
PRODUCT PREVIEW
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