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TUSB2046B, TUSB2046I
SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
TUSB2046x 4-Port Hub for the Universal Serial Bus With Optional
Serial EEPROM Interface
1 Features
2 Applications
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
(1)
JEDEC descriptor S-PQFP-G for low-profile quad flatpack
(LQFP).
3 Description
The TUSB2046x is a 3.3-V CMOS hub device that
provides one upstream port and four downstream
ports in compliance with the Universal Serial Bus
(USB) specification as a full-speed hub. Because this
device is implemented with a digital state machine
instead of a microcontroller, no firmware
programming is required. Fully compliant USB
transceivers are integrated into the ASIC for all
upstream and downstream ports. The downstream
ports support full-speed and low-speed devices by
automatically setting the slew rate according to the
speed of the device attached to the ports. The
configuration of the BUSPWR pin selects either the
bus-powered or the self-powered mode.
Configuring the GANGED input determines the power
switching and overcurrent detection modes for the
downstream ports. If GANGED is high, all PWRON
outputs switch together and if any OVRCUR is
activated, all ports transition to the power-off state. If
GANGED is low, the PWRON outputs and OVRCUR
inputs operate on a per-port basis.
Device Information(1)
PART NUMBER
TUSB2046B
TUSB2046BI
TUSB2046I
PACKAGE
BODY SIZE (NOM)
VQFN (32)
5.00 mm × 5.00 mm
LQFP (32)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
USB-Tiered Configuration Example
Printer with
TUSB2046B
4-Port Hub
Personal
Computer
Monitor with
TUSB2046B
4-Port Hub
Digital Scanner
...
•
•
•
Computer Systems
Docking Stations
Scanner
Modem
Right Speaker
Keyboard with
TUSB2046B
4-Port Hub
...
•
Fully Compliant With the USB Specification as a
Full-Speed Hub: TID #30220231
32-Pin LQFP (1) Package With a 0.8-mm Terminal
Pitch or QFN Package With a 0.5-mm Pin Pitch
3.3-V Low-Power ASIC Logic
Integrated USB Transceivers
State Machine Implementation Requires No
Firmware Programming
One Upstream Port and Four Downstream Ports
All Downstream Ports Support Full-Speed and
Low-Speed Operations
Two Power Source Modes
– Self-Powered Mode
– Bus-Powered Mode
Power Switching and Overcurrent Reporting Is
Provided Ganged or Per Port
Supports Suspend and Resume Operations
Supports Programmable Vendor ID and Product
ID With External Serial EEPROM
3-State EEPROM Interface Allows EEPROM
Sharing
Push-Pull Outputs for PWRON Eliminate the Need
for External Pullup Resistors
Noise Filtering on OVRCUR Provides Immunity to
Voltage Spikes
Package Pinout Allows 2-Layer PCB
Low EMI Emission Achieved by a 6-MHz Crystal
Input
Migrated From Proven TUSB2040 Hub
Lower Cost Than the TUSB2040 Hub
Enhanced System ESD Performance
No Special Driver Requirements; Works
Seamlessly With Any Operating System With USB
Stack Support
Supports 6-MHz Operation Through a Crystal
Input or a 48-MHz Input Clock
...
1
Mouse
Left Speaker
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TUSB2046B, TUSB2046I
SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Description (Continued) ........................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6
7.1
7.2
7.3
7.4
7.5
7.6
6
6
6
7
7
Absolute Maximum Ratings .....................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Differential Driver Switching Characteristics (Full
Speed Mode) .............................................................
7.7 Differential Driver Switching Characteristics (Low
Speed Mode) .............................................................
7.8 Typical Characteristics ..............................................
8
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 12
8.5 Programming........................................................... 13
9
Application and Implementation ........................ 15
9.1 Application Information............................................ 15
9.2 Typical Application .................................................. 15
10 Power Supply Recommendations ..................... 17
10.1 TUSB2046x Power Supply ................................... 17
10.2 Downstream Port Power ....................................... 17
11 Layout................................................................... 18
11.1 Layout Guidelines ................................................. 18
11.2 Layout Example .................................................... 19
12 Device and Documentation Support ................. 20
7
8
9
Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ....................................... 10
12.1
12.2
12.3
12.4
12.5
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
20
20
20
20
20
13 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision K (January 2016) to Revision L
•
Page
Added device TUSB2046IB to the data sheet........................................................................................................................ 1
Changes from Revision J (July 2015) to Revision K
•
Page
Changed the VQFN package Body Size From: 5.00 mm x 2.00 mm To: 5.00 mm x 5.00 mm ............................................ 1
Changes from Revision I (September 2013) to Revision J
•
2
Page
Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
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Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
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SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
5 Description (Continued)
The TUSB2046x provides the flexibility of using a 6-MHz or a 48-MHz clock. The logic level of the TSTMODE
terminal controls the selection of the clock source. When TSTMODE is low, the output of the internal APLL
circuitry is selected to drive the internal core of the device. When TSTMODE is high, the TSTPLL/48MCLK input
is selected as the input clock source and the APLL circuitry is powered down and bypassed. The internal
oscillator cell is also powered down while TSTMODE is high. Low EMI emission is achieved because the
TUSB2046x can usee a 6-MHz crystal input. Connect the crystal as shown in Figure 6. An internal PLL then
generates the 48-MHz clock used to sample data from the upstream port and to synchronize the 12 MHz used
for the USB clock. If low-power suspend and resume are desired, a passive crystal or resonator must be used.
However, a 6-MHz oscillator may be used by connecting the output to the XTAL1 pin and leaving the XTAL2 pin
open. The oscillator TTL output must not exceed 3.6 V.
For 48-MHz operation, the clock cannot be generated with a crystal using the XTAL2 output because the internal
oscillator cell supports only the fundamental frequency. Other useful features of the TUSB2046x include a
package with a 0.8-mm pin pitch for easy PCB routing and assembly, push-pull outputs for the PWRON pins
eliminate the need for pullup resistors required by traditional open-collector I/Os, and OVRCUR pins have noise
filtering for increased immunity to voltage spikes.
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
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TUSB2046B, TUSB2046I
SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
www.ti.com
6 Pin Configuration and Functions
VF Package
32-Pin LQFP
Top View
RHB Package
32-Pin VQFN With Thermal Pad
Top View
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
8
I
Power source indicator. BUSPWR is an active-high input that indicates whether the downstream
ports source their power from the USB cable or a local power supply. For the bus-power mode,
this terminal must be pulled to 3.3 V, and for the self-powered mode, this terminal must be pulled
low. Input must not change dynamically during operation.
DM0
2
I/O
Root port USB differential data minus. DM0 paired with DP0 constitutes the upstream USB port.
DM1
11
DM2
15
DM3
19
I/O
USB differential data minus. DM1–DM4 paired with DP1–DP4 support up to four downstream USB
ports.
DM4
23
DP0
1
I/O
Root port USB differential data plus. DP0 paired with DM0 constitutes the upstream USB port.
DP1
12
DP2
16
DP3
20
I/O
USB differential data plus. DP1–DP4 paired with DM1–DM4 support up to four downstream USB
ports.
DP4
24
EECLK
5
O
EEPROM serial clock. When EXTMEM is high, the EEPROM interface is disabled. The EECLK
terminal is disabled and must be left floating (unconnected). When EXTMEM is low, EECLK acts
as a 3-state serial clock output to the EEPROM with a 100-μA internal pulldown.
BUSPWR
EEDATA/GA
NGED
6
I/O
EEPROM serial data/power-management mode indicator. When EXTMEM is high,
EEDATA/GANGED selects between ganged or per-port power overcurrent detection for the
downstream ports. When EXTMEM is low, EEDATA/GANGED acts as a serial data I/O for the
EEPROM and is internally pulled down with a 100-μA pulldown. This standard TTL input must not
change dynamically during operation.
EXTMEM
26
I
When EXTMEM is high, the serial EEPROM interface of the device is disabled. When EXTMEM is
low, terminals 5 and 6 are configured as the clock and data terminals of the serial EEPROM
interface, respectively.
GND
4
7, 28
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GND terminals must be tied to ground for proper operation.
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
TUSB2046B, TUSB2046I
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SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
Pin Functions (continued)
PIN
NAME
NO.
OVRCUR1
10
OVRCUR2
14
OVRCUR3
18
OVRCUR4
22
PWRON1
9
PWRON2
13
PWRON3
17
PWRON4
21
I/O
DESCRIPTION
I
Overcurrent input. OVRCUR1–OVRCUR4 are active low. For per-port overcurrent detection, one
overcurrent input is available for each of the four downstream ports. In the ganged mode, any
OVRCUR input may be used and all OVRCUR terminals must be tied together. OVRCUR
terminals are active low inputs with noise filtering logic.
O
Power-on/-off control signals. PWRON1–PWRON4 are active low, push-pull outputs. Push-pull
outputs eliminate the pullup resistors which open-drain outputs require. However, the external
power switches that connect to these terminals must be able to operate with 3.3-V inputs because
these outputs cannot drive 5-V signals.
RESET
4
I
RESET is an active low TTL input with hysteresis and must be asserted at power up. When
RESET is asserted, all logic is initialized. Generally, a reset with a pulse width between 100 μs
and 1 ms is recommended after 3.3-V VCC reaches its 90%. Clock signal has to be active during
the last 60 μs of the reset window.
SUSPND
32
O
Suspend status. SUSPND is an active high output available for external logic power-down
operations. During the suspend mode, SUSPND is high. SUSPND is low for normal operation.
TSTMODE
31
I
Test/mode terminal. TSTMODE is used as a test terminal during production testing. This terminal
must be tied to ground or 3.3-V VCC for normal 6-MHz or 48-MHz operation, respectively.
TSTPLL/
48MCLK
27
I/O
Test/48-MHz clock input. TSTPLL/48MCLK is used as a test terminal during production testing.
This terminal must be tied to ground for normal 6-MHz operation. If 48-MHz input clock is desired,
a 48-MHz clock source (no crystal) can be connected to this input terminal.
VCC
3, 25
3.3-V supply voltage
XTAL1
30
I
Crystal 1. XTAL1 is a 6-MHz crystal input with 50% duty cycle. An internal PLL generates the 48MHz and 12-MHz clocks used internally by the ASIC logic.
XTAL2
29
O
Crystal 2. XTAL2 is a 6-MHz crystal output. This terminal must be left open when using an
oscillator.
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
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TUSB2046B, TUSB2046I
SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
www.ti.com
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
VCC
Supply voltage (2)
–0.5
3.6
V
VI
Input voltage range
–0.5
VCC + 0.5
V
VO
Output voltage range
–0.5
VCC + 0.5
V
IIK
Input clamp current
VI < 0 V or VI < VCC
±20
mA
IOK
Output clamp current
VO < 0 V or VO < VCC
±20
mA
TA
Operating free-air temperature
Tstg
Storage temperature range
(1)
(2)
TUSB2046B
TUSB2046BI, TUSB2046I
0
70
–40
85
–65
150
°C
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltage levels are with respect to GND.
7.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±4000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±1500
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.3 Recommended Operating Conditions
PARAMETER
VCC
Supply voltage
VI
VO
TUSB2046B
TUSB2046BI, TUSB2046I
MIN
NOM
MAX
3
3.3
3.6
UNIT
V
3.3
3.6
Input voltage, TTL/LVCMOS
0
VCC
V
Output voltage, TTL/LVCMOS
0
VCC
V
VIH(REC)
High-level input voltage, signal-ended receiver
2
VCC
V
VIL(REC)
Low-level input voltage, signal-ended receiver
0.8
V
VIH(TTL)
High-level input voltage, TTL/LVCMOS
2
VCC
V
VIL(TTL)
Low-level input voltage, TTL/LVCMOS
0
0.8
V
0
70
–40
85
22 (–5%)
22 (5%)
TUSB2046B
TA
Operating free-air temperature
R(DRV)
External series, differential driver resistor
f(OPRH)
Operating (dc differential driver) high speed mode
f(OPRL)
Operating (dc differential driver) low speed mode
VICR
Common mode, input range, differential receiver
tt
Input transition times, TTL/LVCMOS
TJ
Junction temperature range
6
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TUSB2046BI, TUSB2046I
°C
Ω
12
Mb/s
1.5
Mb/s
0.8
2.5
V
0
25
ns
–40
115
°C
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
TUSB2046B, TUSB2046I
www.ti.com
SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
7.4 Thermal Information
TUSB2046x
THERMAL METRIC (1)
RHB (VQFN)
UNIT
32 PINS
RθJA
Junction-to-ambient thermal resistance
35.7
°C/W
RθJCtop
Junction-to-case (top) thermal resistance
28.4
°C/W
RθJB
Junction-to-board thermal resistance
9.9
°C/W
ψJT
Junction-to-top characterization parameter
0.5
°C/W
ψJB
Junction-to-board characterization parameter
9.8
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
4.3
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Electrical Characteristics
over recommended ranges of operating free-air temperature and supply voltage (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TTL/LVCMOS
VOH
High-level output voltage
USB data lines
TTL/LVCMOS
VOL
Low-level output voltage
VIT+
Positive input threshold
VIT–
Negative-input threshold
Vhys
Input hysteresis (1)
(VT+ – VT–)
IOZ
High-impedance output current
IIL
IIH
USB data lines
IOH = –4 mA
R(DRV) = 15 kΩ to GND
IOH = –12 mA (without R(DRV))
MIN
MAX
2.8
V
VCC – 0.5
IOL = 4 mA
0.5
R(DRV) = 1.5 kΩ to 3.6 V
0.3
IOL = 12 mA (without R(DRV))
0.5
TTL/LVCMOS
Single-ended
V
1.8
0.8 V ≤ VICR ≤ 2.5 V
TTL/LVCMOS
Single-ended
UNIT
VCC – 0.5
V
1.8
0.8
0.8 V ≤ VICR ≤ 2.5 V
TTL/LVCMOS
V
1
0.3
0.7
300
500
mV
Single-ended
0.8 V ≤ VICR ≤ 2.5 V
TTL/LVCMOS
V = VCC or GND (2)
±10
USB data lines
0 V ≤ VO ≤ VCC
±10
Low-level input current
TTL/LVCMOS
VI = GND
–1
μA
High-level input current
TTL/LVCMOS
VI = VCC
1
μA
z0(DRV)
Driver output impedance
USB data lines
Static VOH or VOL
7.1
19.9
Ω
VID
Differential input voltage
USB data lines
0.8 V ≤ VICR ≤ 2.5 V
0.2
ICC
Input supply current
(1)
(2)
μA
V
Normal operation
Suspend mode
40
mA
1
μA
Applies for input buffers with hysteresis.
Applies for open-drain buffers.
7.6 Differential Driver Switching Characteristics (Full Speed Mode)
over recommended ranges of operating free-air temperature and supply voltage, CL = 50 pF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
tr
Transition rise time for DP or DM
See Figure 1 and Figure 2
tf
Transition fall time for DP or DM
See Figure 1 and Figure 2
t(RFM)
Rise/fall time matching (1)
(tr/tf) × 100
VO(CRS)
Signal crossover output voltage (1)
(1)
MIN
MAX
4
20
ns
ns
4
20
90%
110%
1.3
2.0
UNIT
V
Characterized only. Limits are approved by design and are not production tested.
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
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SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
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7.7 Differential Driver Switching Characteristics (Low Speed Mode)
over recommended ranges of operating free-air temperature and supply voltage, CL = 50 pF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
(1)
MIN
MAX
UNIT
tr
Transition rise time for DP or DM
CL = 200 pF to 600 pF,
See Figure 1 and Figure 2
75
300
ns
tf
Transition fall time for DP or DM (1)
CL = 200 pF to 600 pF,
See Figure 1 and Figure 2
75
300
ns
t(RFM)
Rise/fall time matching (1)
(tr/tf) × 100
80%
120%
VO(CRS)
Signal crossover output voltage (1)
CL = 200 pF to 600 pF
1.3
2.0
(1)
V
Characterized only. Limits are approved by design and are not production tested.
22 Ω
1.5 kΩ
15 kΩ
22 Ω
15 kΩ
Figure 1. Differential Driver Switching Load
Figure 2. Differential Driver Timing Waveforms
Vhys
Logic high
VCC
VIH
VIT+
VIT-
VIL
Logic low
0V
Figure 3. Single-Ended Receiver Input Signal Parameter Definitions
8
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SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
V ID - Diff erential Receiver Input Sensitivity - V
7.8 Typical Characteristics
1.5
1.3
1
0.5
0.2
0
0
3
1
2
3.6
0.8
2.5
VICR - Common Mode Input Rang e - V
4
Figure 4. Differential Receiver Input Sensitivity vs Common Mode Input Range
8 Detailed Description
8.1 Overview
The TUSB2046x is a 3.3-V CMOS hub device that provides one upstream port and four downstream ports in
compliance with the Universal Serial Bus (USB) specification as a full-speed hub. Because this device is
implemented with a digital state machine instead of a microcontroller, no firmware programming is required. Fully
compliant USB transceivers are integrated into the ASIC for all upstream and downstream ports. The
downstream ports support full-speed and low-speed devices by automatically setting the slew rate according to
the speed of the device attached to the ports. The configuration of the BUSPWR pin selects either the buspowered or the self-powered mode.
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: TUSB2046B TUSB2046I
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8.2 Functional Block Diagram
DP0
DM0
1
2
USB
Transceiver
32
27
SUSPND
TSTPLL/48MCLK
30 XTAL1
29
Suspend/Resume
Logic and
Frame Timer
HUB Repeater
OSC/PLL
XTAL2
SIE
4
26
6
SIE Interface
Logic
Serial
EEPROM
Interface
5
RESET
EXTMEM
EEDATA/GANGED
EECLK
Port 1
Logic
Port 2
Logic
Hub/Device
Command
Decoder
Port 3
Logic
8
BUSPWR
Port 4
Logic
USB
Transceiver
24
DP4
23
DM4
USB
Transceiver
20
DP3
19
DM3
USB
Transceiver
16
DP2
15
USB
Transceiver
12
DM2
DP1
Hub
Power
Logic
10, 14, 18, 22
OVRCUR1 – OVRCUR4
11
DM1
9, 13, 17, 21
PWRON1 – PWRON4
8.3 Feature Description
8.3.1 USB Power Management
External power-management devices, such as the TPS2044, are required to control the 5-V source to the
downstream ports according to the corresponding values of the PWRON pin. Upon detecting any overcurrent
conditions, the power-management device sets the corresponding OVRCUR pin of the TUSB2046x to a logic
low. If GANGED is high, all PWRON outputs switch together and if any OVRCUR is activated, all ports transition
to the power-off state. If GANGED is low, the PWRON outputs and OVRCUR inputs operate on a per-port basis.
Both bus-powered and self-powered hubs require overcurrent protection for all downstream ports. The two types
of protection are individual-port management (individual-port basis) or ganged-port management (multiple-port
basis). Individual-port management requires power-management devices for each individual downstream port,
but adds robustness to the USB system because, in the event of an overcurrent condition, the USB host only
powers down the port that has the condition. The ganged configuration uses fewer power-management devices
and thus has lower system costs, but in the event of an overcurrent condition on any of the downstream ports, all
the ganged ports are disabled by the USB host.
10
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SLLS413L – FEBRUARY 2000 – REVISED JUNE 2017
Feature Description (continued)
Using a combination of the BUSPWR and EEDATA/GANGED inputs, the TUSB2046x supports four modes of
power management: bus-powered hub with either individual-port power-management or ganged-port power
management, and the self-powered hub with either individual-port power management or ganged-port power
management. TI supplies the complete hub solution with the TUSB2036 (2/3-port), TUSB2046x, and the
TUSB2077 (7-port) hubs along with the power-management devices needed to implement a fully USB
specification-compliant system.
8.3.2 Clock Generation
The input clock configuration logic of TUSB2046x is enhanced to accept a 6-MHz crystal or 48-MHz on-the-board
clock source with a simple tie-off change on TSTMODE (pin 31).
• A 6-MHz input clock configuration is shown in Figure 5.
In this mode, both TSTMODE and TSTPLL/48MCLK pins must be tied to ground. The hub is configured to
use the 6-MHz clock on pins 30 and 29, which are XTAL1 and XTAL2, respectively, on the TUSB2046x. This
is identical to the TUSB2046.
Figure 5. 6-MHz Input Clock Configuration
CL
XTAL1
XTAL2
C1
C2
NOTE: This figure assumes a 6-MHz fundamental crystal that is parallel loaded. The component values of C1, C2, and Rd
are determined using a crystal from Fox Electronics – part number HC49U-6.00MHz 30\50\0-70\20, which means
±30 ppm at 25°C and ±50 ppm from 0°C to 70°C. The characteristics for the crystal include a load capacitance (CL) of
20 pF, maximum shunt capacitance (Co) of 7 pF, and the maximum ESR of 50 Ω. In order to insure enough negative
resistance, use C1 = C2 = 27 pF. The resistor Rd is used to trim the gain, and Rd = 1.5 kΩ is recommended.
Figure 6. Crystal Tuning Circuit
•
A 48-MHz input clock configuration is shown in Figure 7.
In this mode, both TSTMODE and XTAL1 pins must be tied to 3.3-V VCC. The hub accepts the 48-MHz clock
input on TSTPLL/48MCLK (terminal 27). XTAL2 must be left floating (open) for this configuration. Only the
oscillator or the onboard clock source is accepted for this mode. A crystal cannot be used for this mode,
because the internal oscillator cell of the chip only supports the fundamental frequency.
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Feature Description (continued)
TUSB2046B USB HUB
3.3 V
30
XTAL1
29
Open
XTAL2
31
TSTMODE
48-MHz Oscillator
or on Board Clock Source 27
TSTPLL/48MCLK
Figure 7. 48-MHz Input Clock Configuration
8.4 Device Functional Modes
8.4.1 Vendor ID and Product ID With External Serial EEPROM
The EXTMEM pin enables or disables the optional EEPROM interface. When the EXTMEM pin is high, the
product ID (PID) displayed during enumeration is the general-purpose USB hub. For this default, pin 5 is disabled
and pin 6 functions as the GANGED input pin. If custom product ID (PID) and vendor ID (VID) descriptors are
desired, the EXTMEM pin must be low (EXTMEM = 0). For this configuration, pins 5 and 6 function as the
EEPROM interface with pins 5 and 6 functioning as EECLK and EEDATA, respectively. See Table 1 for a
description of the EEPROM memory map. A block diagram example of how to connect the external EEPROM if a
custom PID and VID are desired is shown in Figure 8.
Ω
Figure 8. Typical Application of the TUSB2046x USB Hub
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8.5 Programming
An SGS Thompson M93C46 EEPROM, or equivalent, stores the programmable VID and PID. When the
EEPROM interface is enabled (EXTMEM = 0), the EECLK and EEDATA are internally pulled down (100 μA)
inside the TUSB2046x. The internal pulldowns are disabled when the EEPROM interface is disabled
(EXTMEM = 1).
The EEPROM is programmed with the three 16-bit locations as shown in Table 1. Connecting terminal 6 of the
EEPROM high (ORG = 1) organizes the EEPROM memory into 64×16-bit words.
Table 1. EEPROM Memory Map
ADDRESS
D15
D14
D13
D12–D8
D7–D0
00000
0
GANGED
00000
00000
00000000
00001
VID high-byte
00010
PID high-byte
VID low-byte
PID low-byte
XXXXXXXX
The D and Q signals of the EEPROM must be tied together using a 1-kΩ resistor with the common I/O
operations forming a single-wire bus. After system power-on reset, the TUSB2046x performs a one-time access
read operation from the EEPROM if the EXTMEM terminal is pulled low and the chip select(s) of the EEPROM is
connected to the system power-on reset. Initially, the EEDATA terminal is driven by the TUSB2046x to send a
start bit (1) which is followed by the read instruction (10) and the starting-word address (00000). Once the read
instruction is received, the instruction and address are decoded by the EEPROM, which then sends the data to
the output shift register. At this point, the hub stops driving the EEDATA terminal and the EEPROM starts driving.
A dummy (0) bit is then output and the first three 16-bit words in the EEPROM are output with the most
significant bit (MSB) first.
The output data changes are triggered by the rising edge of the clock provided by the TUSB2046x on the EECLK
terminal. The SGS-Thompson M936C46 EEPROM is recommended because it advances to the next memory
location by automatically incrementing the address internally. Any EEPROM used must have the automatic
internal address advance function. After reading the three words of data from the EEPROM, the TUSB2046x
puts the EEPROM interface into a high-impedance condition (pulled down internally) to allow other logic to share
the EEPROM. The EEPROM read operation is summarized in Figure 9. For more details on EEPROM operation,
refer to SGS-Thompson Microelectronics M93C46 Serial Microwire Bus EEPROM data sheet.
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D
C
S
Start
A5
Hub Driving Data Line
Read OP Code(10)
Other
Address
Bits
A1
6 Bit Address (000000)
A0
Dummy
Bit
MSB of The
First Word
D15
Other
LSB of
Data Bits Third Word
D0
EEPROM Driving Data Line
D14
48 Data Bits
MSB of
Fourth Word
XX
Don’t Care
3-Stated
With Internal
Pulldown
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Figure 9. EEPROM Read Operation Timing Diagram
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
A major advantage of USB is the ability to connect 127 functions configured in up to 6 logical layers (tiers) to a
single personal computer.
Another advantage of USB is that all peripherals are connected using a standardized 4-wire cable that provides
both communication and power distribution. The power configurations are bus-powered and self-powered modes.
The maximum current that may be drawn from the USB 5-V line during power up is 100 mA. For the buspowered mode, a hub can draw a maximum of 500 mA from the 5-V line of the USB cable. A bus-powered hub
must always be connected downstream to a self-powered hub unless it is the only hub connected to the PC and
there are no high-powered functions connected downstream. In the self-powered mode, the hub is connected to
an external power supply and can supply up to 500 mA to each downstream port. High-powered functions may
draw a maximum of 500 mA from each downstream port and may only be connected downstream to selfpowered hubs. Per the USB specification, in the bus-powered mode, each downstream port can provide a
maximum of 100 mA of current, and in the self-powered mode, each downstream port can provide a maximum of
500 mA of current.
9.2 Typical Application
A common application for the TUSB2046x is as a self powered USB hub product. The product is powered by an
external 5-V DC power adapter. In this application, using a USB cable TUSB2046x’s upstream port is plugged
into a USB host controller. The downstream ports of the TUSB2046x are exposed to users for connecting USB
cameras, keyboards, printers, and so forth.
USB
Type B
Connector
DC
Power
US Port
TUSB2046B
USB
Power Switch
USB
Power Switch
DS Port 1
DS Port 2
DS Port 3
DS Port 4
USB Type A
Connector
USB Type A
Connector
USB Type A
Connector
USB Type A
Connector
Figure 10. Self-Powered USB Hub Product
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Typical Application (continued)
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 2.
Table 2. Design Parameters
DESIGN PARAMETERS
VALUE
VCC Supply
3.3-V
Downstream Ports
4
Power Management
Individual-Port
Clock Source
6-MHz Crystal
External EEPROM
No
Power Source Mode
Self-Powered
9.2.2 Detailed Design Procedure
In a self-powered configuration, the TUSB2046x can be implemented for individual-port power management
when used with the TPS2044 because it is capable of supplying 500 mA of current to each downstream port and
can provide current limiting on a per-port basis. When the hub detects a fault on a downstream port, power is
removed from only the port with the fault and the remaining ports continue to operate normally. Self-powered
hubs are required to implement overcurrent protection and report overcurrent conditions. The SN75240 transient
suppressors reduce inrush current and voltage spikes on the data lines.
D
1.5 kΩ
SN75240
Ω
Ω
A
SN75240
3.3 V LDO
A
C
100 µF
Ω
Ω
B
Ω
Ω
SN75240
A
100 µF
TPS2044
B
A
100 µF
100 µF
B
B
NOTES: A. TPS2044, TPS2042, and SN75240 are Texas Instruments devices. Two TPS2042 devices can be substituted for the TPS2044.
The OCn outputs of the TPS204n are open drain. A 10-kΩ pullup is recommended.
B. 120 µF per hub is the minimum required per the USB specification. However, TI recommends a 100-µF, low ESR,
tantalum capacitor per port for immunity to voltage droop.
C. LDO is a 5-V-to-3.3-V voltage regulator
D. All USB DP, DM signal pairs require series resistors of approximately 27Ω to ensure proper termination. An optional filter
capacitor of about 22 pF is recommended for EMI suppression. This capacitor, if used, must be placed between the hub
terminal and the series resistor, as per section 7.1.6 of the USB specification.
Figure 11. TUSB2046x Self-Powered Hub, Individual-Port Power-Management Application
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9.2.3 Application Curve
Figure 12. Downstream Port 1
10 Power Supply Recommendations
10.1 TUSB2046x Power Supply
VCC should be implemented as a single power plane.
• The VCC pins of the TUSB2046x supply 3.3-V power rail to the I/O of the TUSB2046x. This power rail can be
isolated from all other power rails by a ferrite bead to reduce noise.
• All power rails require a 10-μF capacitor or 1-μF capacitors for stability and noise immunity. These bulk
capacitors can be placed anywhere on the power rail. The smaller decoupling capacitors should be placed as
close to the TUSB2046x power pins as possible with an optimal grouping of two of differing values per pin.
10.2 Downstream Port Power
•
•
•
The downstream port power, VBUS, must be supplied by a source capable of supplying 5 V and up to 500
mA per port. Downstream port power switches can be controlled by the TUSB2046x signals. It is also
possible to leave the downstream port power always enabled.
A large bulk low-ESR capacitor of 22 μF or larger is required on each downstream port’s VBUS to limit in-rush
current.
The ferrite beads on the VBUS pins of the downstream USB port connections are recommended for both
ESD and EMI reasons. A 0.1-μF capacitor on the USB connector side of the ferrite provides a low impedance
path to ground for fast rise time ESD current that might have coupled onto the VBUS trace from the cable.
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11 Layout
11.1 Layout Guidelines
11.1.1 Placement
1. A 0.1-μF should be placed as close as possible on VCC power pin.
2. The ESD and EMI protection devices (if used) should also be placed as close as possible to the USB
connector.
3. If a crystal is used, it must be placed as close as possible to the TUSB2046x’s XTAL1 and XTAL2 pins.
4. Place voltage regulators as far away as possible from the TUSB2046x, the crystal, and the differential pairs.
5. In general, the large bulk capacitors associated with the power rail should be placed as close as possible to
the voltage regulators.
11.1.2 Differential Pairs
1.
2.
3.
4.
5.
6.
7.
8.
9.
Must be designed with a differential impedance of 90Ω ±10%.
Route all differential pairs on the same layer adjacent to a solid ground plane.
Do not route differential pairs over any plane split.
Adding test points will cause impedance discontinuity and will therefore negative impact signal performance.
If test points are used, they should be placed in series and symmetrically. They must not be placed in a
manner that causes stub on the differential pair.
Avoid 90-degree turns in trace. The use of bends in differential traces should be kept to a minimum. When
bends are used, the number of left and right bends should be as equal as possible and the angle of the bend
should be ≥ 135 degrees. This will minimize any length mismatch causes by the bends and therefore
minimize the impact bends have on EMI.
Minimize the trace lengths of the differential pair traces. The maximum recommended trace length for USB
2.0 differential pair signals is 8 inches. Longer trace lengths require very careful routing to assure proper
signal integrity.
Match the etch lengths of the differential pair traces. The USB 2.0 differential pairs should not exceed 50 mils
relative trace length difference.
Minimize the use of vias in the differential pair paths as much as possible. If this is not practical, make sure
that the same via type and placement are used for both signals in a pair. Any vias used should be placed as
close as possible to the TUSB2046x device.
Do not place power fuses across the differential pair traces.
11.1.3 Ground
TI recommends using only one board ground plane in the design. This provides the best image plane for signal
traces running above the plane. The thermal pad of the TUSB2046x and any of the voltage regulators should be
connected to this plane with vias. An earth or chassis ground is implemented only near the USB port connectors
on a different plane for EMI and ESD purposes.
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11.2 Layout Example
Figure 13. TUSB2046x Layout Example
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12 Device and Documentation Support
12.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to order now.
Table 3. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
TUSB2046B
Click here
Click here
Click here
Click here
Click here
TUSB2046BI
Click here
Click here
Click here
Click here
Click here
TUSB2046I
Click here
Click here
Click here
Click here
Click here
12.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TUSB2046BIRHBR
ACTIVE
VQFN
RHB
32
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TUSB
2046BI
TUSB2046BIRHBRG4
ACTIVE
VQFN
RHB
32
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TUSB
2046BI
TUSB2046BIRHBT
ACTIVE
VQFN
RHB
32
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TUSB
2046BI
TUSB2046BIRHBTG4
ACTIVE
VQFN
RHB
32
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TUSB
2046BI
TUSB2046BVF
ACTIVE
LQFP
VF
32
250
RoHS & Green
NIPDAU
Level-3-260C-168 HR
0 to 70
TUSB2046B
TUSB2046BVFG4
ACTIVE
LQFP
VF
32
250
RoHS & Green
NIPDAU
Level-3-260C-168 HR
0 to 70
TUSB2046B
TUSB2046BVFR
ACTIVE
LQFP
VF
32
1000
RoHS & Green
NIPDAU
Level-3-260C-168 HR
0 to 70
TUSB2046B
TUSB2046BVFRG4
ACTIVE
LQFP
VF
32
1000
RoHS & Green
NIPDAU
Level-3-260C-168 HR
0 to 70
TUSB2046B
TUSB2046IBVF
ACTIVE
LQFP
VF
32
250
RoHS & Green
NIPDAU
Level-3-260C-168 HR
-40 to 85
TUSB2046I
TUSB2046IBVFR
ACTIVE
LQFP
VF
32
1000
RoHS & Green
NIPDAU
Level-3-260C-168 HR
-40 to 85
TUSB2046I
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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