SMSC USB2504, USB2504A User Manual
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
,
Datasheet
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 DATASHEET 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
Datasheet
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
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently da ted
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
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Revision 2.3 (08-27-07) 2 SMSC USB2504/USB2504A
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
Table of Contents
Chapter 1 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 OEM Selectable Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2 Pin Table 4-Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 3 Pin Configuration 4-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 4 4-Port Hub Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 5 Functional Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 4-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.1 Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.2 VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2 EEPROM Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.1 I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.2 In-Circuit EEPROM Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.3 EEPROM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.3 SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3.1 Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3.2 Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3.3 General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3.4 Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.5 Stretching the SCLK Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.6 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.7 Bus Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.8 SMBus Alert Response Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.9 Internal SMBus Memory Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.4 Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.5 Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.6 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6.1 External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.6.2 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chapter 6 Backward Compatibility to the USB20H04. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.1 Internal 1.8V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.2 Configuration by Internal Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.3 Configuration by SMBus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.4 PRTPWR_POL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 7 XNOR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Chapter 8 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.1 Maximum Guaranteed Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2 Recommended Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Chapter 9 AC Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.1 Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.1.1 SMBus Interface:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.1.2 I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.1.3 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
SMSC USB2504/USB2504A 3 Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
Chapter 10 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Revision 2.3 (08-27-07) 4 SMSC USB2504/USB2504A
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
List of Figures
Figure 3.1 4-Port 64 Pin TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 4.1 4-Port Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5.1 LED Strapping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 5.2 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 5.3 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 5.4 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 10.1 64 Pin TQFP Package Outline (10x10x1.4 mm body - 2 mm footprint). . . . . . . . . . . . . . . . . 46
SMSC USB2504/USB2504A 5 Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
List of Tables
Table 2.1 4-Port Pin Table for 64-TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4.1 4-Port Hub Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 4.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.3 Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4.4 Power, Ground, and No Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 4.5 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 5.1 User-Defined Descriptor Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 5.2 SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 5.3 SMBus Read Byte Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 5.4 SMBus Slave Interface Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 5.5 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 5.6 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 5.7 Reset_N Timing for SMBus Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 8.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 10.1 64 Pin TQFP Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Revision 2.3 (08-27-07) 6 SMSC USB2504/USB2504A
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
Chapter 1 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.
1.1 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 operate s as a Bus-Powered 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 down strea m USB perip heral device).
Hardware strapping options enable configuration of the following feature s.
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 7 Revision 2.3 (08-27-07)
DATASHEET
Chapter 2 Pin Table 4-Port
Table 2. 1 4-Port Pin Table for 64-TQF P
UPSTREAM USB 2.0 INTERFACE (3 PINS)
USBDP0 USBDN0 VBUS_DET
4-PORT USB 2.0 INTERFACE (26 PINS)
USBDP1 USBDN1 USBDP2 USBDN2
USBDP3 USBDN3 USBDP4 USBDN4
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
GR1/
NON_REM0
AM1/
GANG_EN
PRTPWR1 PRTPWR2 PRTPWR3 PRTPWR4
OCS1_N OCS2_N OCS3_N OCS4_N
PRTPWR_POL RBIAS
SDA/SMBDATA SCL/SMBCLK/ CFG_SEL2 CFG_SEL1
CFG_SEL0
XTAL1/CLKIN XTAL2 RESET_N SELF_PWR
ATEST/
REG_EN
POWER, GROUND (17 PINS) AND (5) NO CONNECT
GR2/
NON_REM1
AM2/
MTT_EN
SERIAL PORT INTERFACE (5 PINS)
MISC (8 PINS)
CLKIN_EN TEST1 TEST0
GR3/
PRT_DIS0
AM3 AM4/
GR4/
PRT_DIS1
LED_EN
Revision 2.3 (08-27-07) 8 SMSC USB2504/USB2504A
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
Chapter 3 Pin Configuration 4-Port Hub
RESET_N
CFG_SEL1
SELF_PWR
VBUS_DET
VSS
VDD18
VSS
NC
XTAL2
XTAL1/CLKIN
CFG_SEL2
VDDA18PLL
VDDA33PLL
ATEST/REG_EN
RBIAS
VSS
49
64
TEST1
48
1
CLKIN_EN
PRTPWR2
OCS2_N
OCS1_N
PRTPWR1
USB2504 &
USB2504A
OCS3_N
VDD18
VSS
PRTPWR4
PRTPWR3
CFG_SEL0
OCS4_N
SCL/SMBCLK
NC
SDA/SMBDATA
33
16
32
17
NC
TEST0
VDD18
VSS
VDD33
GR1/NON_REM0
AM1/GANG_EN
GR2/NON_REM1
AM2/MTT_EN
PRTPWR_POL
GR3/PRT_DIS0
AM3
GR4/PRT_DIS1
AM4/LED_EN
NC
NC
VDDA33
USBDP0
VSS
USBDN0
USBDP1
USBDN1
VDDA33
USBDP2
USBDN2
VSS
USBDP3
USBDN3
VDDA33
USBDP4
USBDN4
VSS
Figure 3.1 4-Port 64 Pi n TQFP
SMSC USB2504/USB2504A 9 Revision 2.3 (08-27-07)
DATASHEET
Chapter 4 4-Port Hub 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
Datasheet
To
EEPROM
or SMBus
Master
SCLSD
Upstream
PHY
Repeater
Downstream
PHY #1
Downstream
USB DataOCSense
Power
Detect
#4
Internal
Defaults
Select
V
BUS
Switch Driver
LED Drivers
PLL
Routing Logic
Port #1
OC Sense
Switch/LED
Drivers
1.8V
Reg.
SIE
TT#1TT#2TT#3TT
Downstream
...
PHY #4
Downstream
USB DataOCSense
Figure 4.1 4-Port Block Diagram
Serial
Interface
Controller
Port
Controller
Port #4
OC Sense
Switch Driver
LED Drivers
Switch/LED
Drivers
Ta ble 4.1 4-Port Hub Pin Descriptions
NAME SYMBOL TYPE FUNCTION
UPSTREAM USB 2.0 INTERFACE
USB Bus Data USBDN0
IO-U These pins connect to the upstream USB bus data signals.
USBDP0
Detect Upstream
VBUS Power
VBUS_DET I/O12 Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the
internal D+ pull-up resistor (signalling a connect event).
When designing a detachable hub, this pin must be
connected to the VBUS power pin of the USB port that is
upstream of the hub. (Use of a weak pull-down resistor is
recommended.)
For self-powered applications with a permanently attached
host, this pin must be pulled-up to either 3.3V or 5.0V
(typically VDD33).
Revision 2.3 (08-27-07) 10 SMSC USB2504/USB2504A
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
Table 4.1 4-Port Hub Pin Descriptions (continued)
NAME SYMBOL TYPE FUNCTION
4-PORT USB 2.0 HUB INTERFACE
High-Speed USB
Data
USB Power
Enable
Port 4:3 Green
LED
&
Port Disable
strapping option.
USBDN[4:1]
USBDP[4:1]
IO-U These pins connect to the downstream USB peripheral
devices attached to the Hub’s ports.
PRTPWR[4:1] O12 Enables power to USB peripheral devices (downstream).
The active signal level of the PRTPWR[4:1] pins is
determined by the Power Polarity Strapping function of the
PRTPWR_POL pin.
GR[4:3]/
PRT_DIS[1:0]
I/O12 Green indicator LED for ports 4 and 3. Will be active low
when LED support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at RESET_N negation to
determine if ports [4:2] will be permanently disabled. Also,
the active state of the LED’s will be determined as follows:
PRT_DIS[1:0] = ‘00’, All ports are enabled,
GR4 is active high,
GR3 is active high.
PRT_DIS[1:0] = ‘01’, Port 4 is disabled,
GR4 is active high,
GR3 is active low.
PRT_DIS[1:0] = ‘10’, Ports 4 & 3 are disabled,
GR4 is active low,
GR3 is active high.
PRT_DIS[1:0] = ‘11’, Ports 4, 3 & 2 are disabled,
GR4 is active low,
GR3 is active low.
Port [2:1] Green
LED
&
Port Non-
Removable
strapping option.
GR[2:1]/
NON_REM[1:0]
I/O12 Green indicator LED for ports 2 and 1. Will be active low
when LED support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at RESET_N negation to
determine if ports [3:1] contain permanently attached (nonremovable) devices. Also, the active state of the LED’s will
be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable,
GR2 is active high,
GR1 is active high.
NON_REM[1:0] = ‘01’, Port 1 is non-removable,
GR2 is active high,
GR1 is active low.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,
GR2 is active low,
GR1 is active high.
NON_REM[1:0] = ‘11’, Ports 1, 2, & 3 are non-removable,
GR2 is active low,
GR1 is active low.
SMSC USB2504/USB2504A 11 Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Table 4.1 4-Port Hub Pin Descriptions (continued)
NAME SYMBOL TYPE FUNCTION
Datasheet
Port 4 Amber
LED
&
LED Enable
strapping option
Port 3 Amber
LED
Port 2 Amber
LED
&
MTT Disable
Port 1 Amber
LED
&
Gang Power
Switching and
Current Sensing
strapping option.
AM4/
LED_EN
I/O12 Amber indicator LED for port 4. Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if LED support is enabled or disabled. Also, the active state
of the LED will be determined as follows:
‘0’ = LED support is disabled, LED is inactive
‘1’ = LED Support is enabled, LED is active low.
AM3 I/O12 Amber indicator LED for port 3. Signal will be active low.
AM2/
MTT_EN
I/O12 Amber indicator LED for port 2. Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if MTT support is disabled (STT only). Also, the active state
of the LED will be determined as follows:
‘0’ = MTT support is disabled, LED is active high
‘1’ = MTT support is enabled, LED is active l ow.
AM1/
GANG_EN
I/O12 Amber indicator LED for port 1, Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if downstream port power switching and current sensing are
ganged, or individual port-by-port. Also, the active state of
the LED will be determined as follows:
Port Power
Polarity strapping.
Over Current
Sense
USB Transceiver
Bias
‘0’ = Port-by-port sensing & switching, LED is active high
‘1’ = Ganged sensing & switching, LED is active low.
PRTPWR_POL I/O12 Port Power Polarity strapping determination for the active
signal polarity of the [4:1]PRTPWR pins.
While RESET_N is asserted, the logic state of this pin will
(though the use of internal combinatorial logic) determine
the active state of the [4:1]PRTPWR pins in order to ensure
that downstream port power is not inadvertently enabled to
inactive ports during a hardware reset.
On the rising edge of RESET_N (see the applicable
RESET_N timing table in Section 5.6.1), the logi c value will
be latched internally, and will retain the active signal polarity
for the PRTPWR[4:1] pins.
‘1’ = PRTPWR[4:1]_P/N pins have an active ‘high’ polarity
‘0’ = PRTPWR[4:1]_P/N pins have an active ‘low’ polarity
OCS[4:1]_N IPU Input from external current monitor indicating an over-
current condition. {Note: Contains internal pull-up to 3.3V
supply}
RBIAS I-R A 12.0kΩ (+/− 1%) resistor is attached from ground to this
pin to set the transceiver’s internal bias settings.
Revision 2.3 (08-27-07) 12 SMSC USB2504/USB2504A
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
Table 4.1 4-Port Hub Pin Descriptions (continued)
NAME SYMBOL TYPE FUNCTION
SERIAL PORT INTERFACE
Serial Data/SMB
SDA/SMBDATA IOSD12 (Serial Data)/(SMB Data) signal.
Data
Serial Clock/SMB
SCL/SMBCLK IOSD12 (Serial Clock)/(SMB Clock) signal.
Clock
Configuration
Programming
Select
Configuration
Programming
Select
Configuration
Programming
Select
CFG_SEL0 IOSD12 This multifunction pin is read on the rising edge of
RESET_N negation and will determine the hub
configuration method as described in Table 4.2.
CFG_SEL1 I This pin is read on the rising edge of RESET_N (see the
applicable RESET_N timing table in Section 5.6.1) and will
determine the hub configuration method as described in
Table 4.2.
CFG_SEL2 I This pin is read on the rising edge of RESET_N negation
and will determine the hub configuration method as
described in Table 4.2.
Table 4.2 SMBus or EEPROM Interface Behavior
CFG_SEL2 CFG_SEL1 CFG_SEL0 SMBus or EEPROM interface behavior.
X 0 0 Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101100
X 0 1 Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101101
0 1 0 Internal Default Con figuration
1 1 0 Internal Default Con figuration via strapping options.
X 1 1 2-wire (I2C) EEPROMS are supported,
Table 4.3 Miscellaneous Pins
NAME SYMBOL TYPE FUNCTION
Crystal
Input/External
Clock Input
XTAL1/
CLKIN
ICLKx 24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or
to an external 24MHz clock when a crystal is not used.
Crystal Output XTAL2 OCLKx 24MHz Crystal
This is the other terminal of the crystal, or left
unconnected when an external clock source is used to
drive XTAL1/CLKIN. It must not be used to drive any
external circuitry other than the crystal circuit.
Clock Input
Enable
CLKIN_EN I Clock In Enable:
Low = XTAL1 and XTAL2 pins configured for use with
external crystal
High = XTAL1 pin configured as CLKIN, and must be
driven by an external CMOS clock.
SMSC USB2504/USB2504A 13 Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 4-Port Hub
Table 4.3 Miscellaneou s Pin s (continued)
NAME SYMBOL TYPE FUNCTION
Datasheet
RESET Input RESET_N IS This active low signal is used by the system to reset the
Self-Power /
Bus-Power
Detect
TEST Pins TEST[1:0] IPD Used for testing the chip. User must treat as a no-
Analog Test
&
Internal 1.8V
voltage
regulator
enable
NAME SYMBOL TYPE FUNCTION
VDD1P8 VDD18 +1.8V core power.
SELF_PWR I Detects availability of local self-power source.
ATEST/
REG_EN
Table 4.4 Power, Ground, and No Connect
AIO This signal is used for testing the analog section of the
chip. The minimum active low pulse is 1us.
Low = Self/local power source is NOT available (i.e., Hub
gets all power from Upstream USB VBus).
High = Self/local power source is available.
connect or connect to ground.
chip, and to enable or disable the internal 1.8v regulator.
This pin must be connected to VDDA33 to enable the
internal 1.8V regulator, or to VSS to disable the internal
regulator.
When the internal regulator is enabled, the 1.8V power
pins must be left unconnected, except for the required
bypass capacitors.When the PHY is in test mode, the
internal regulator is disabled and the ATEST pin
functions as a test pin.
If the internal regulator is enabled, then VDD18 pin 54
must have a 4.7μF (or greater) ±20% (ESR <0.1Ω)
capacitor to VSS
VDDAPLL3P3 VDDA33PLL +3.3V Filtered analog power for the internal PLL
If the internal PLL 1.8V regulator is enabled, then this pin
acts as the regulator input
VDDAPLL1P8 VDDA18PLL +1.8V Filtered analog power for internal PLL.
If the internal regulator is enabled, then this pin must
have a 4.7
to VSS
VDDIO3P3 VDD33 +3.3V I/O power.
VDDA3P3 VDDA33 +3.3V Filtered analog power.
VSS VSS Ground.
μF (or greater) ±20% (ESR <0.1Ω) capacitor
Revision 2.3 (08-27-07) 14 SMSC USB2504/USB2504A
DATASHEET
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