TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
D
Universal Serial Bus (USB) Version 1.0
Compliant
D
Integrated USB Transceivers
D
Four Downstream Ports
D
Two Power Source Modes
– Self-Powered Mode
– Bus-Powered Mode
D
Power Switching and Overcurrent
Reporting is Provided Ganged or Per Port
D
All Downstream Ports Support Full-Speed
and Low-Speed Operations
D
Supports Suspend and Resume Operations
D
Pin-to-Pin Compatible with the TUSB2040
Device when EXTMEM Pin is Low
D
Supports Programmable Vendor ID and
Product ID With External Serial EEPROM
D
Tri-State EEPROM Interface Allows
EEPROM Sharing
D
Available in 28-Pin DIP and 48-Pin TQFP
Packages
D
3.3-V Operation
description
The TUSB2040A hub is a 3.3-V CMOS device
that provides up to four downstream ports in
compliance with the USB specification 1.0
version. Pin 21 (EXTMEM) enables or disables
the EEPROM interface. When EXTMEM is low,
the TUSB2040A is functionally equivalent to the
TUSB2040 hub and the product ID (PID)
displayed during enumeration is General Purpose
USB Hub. For this configuration, pins 9 and 10 are
the BUSPWR
respectively.
If programmable vendor ID(VID) and product
ID(PID) descriptors are desired, pin 21 must be
high (EXTMEM = 1) and a SGS Thompson
M93C46 or equivalent EEPROM must be
connected to pins 9 and 10. For this configuration,
the values for BUSPWR
in the EEPROM and pins 9 and 10 become the
EEPROM interface.
and GANGED input pins,
and GANGED are stored
N PACKAGE
(TOP VIEW)
OVRCUR2
PWRON1
OVRCUR1
GND
BUSPWR
/SCL
GANGED/SDA
DP0
1
DM0
2
GND
3
NC
4
NC
5
DP1
6
DM1
7
NC
8
NC
BUSPWR
GANGED/SDA
†
JEDEC descriptor S–PQFP–G for thin quad flatpack (TQFP)
/SCL
NC
9
10
11
12
1
2
3
DP0
4
DM0
5
6
DP1
7
DM1
8
9
10
DP2
11
DM2
12
V
13
CC
14
DP3
PT PACKAGE
(TOP VIEW)
PWRON1
OVRCUR1
OVRCUR2NCPWRON2
46
474845
13141516172418
CC
DM2
NC
V
DP2
4443424140
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
NC
DP3
NC
19
DM3
PWRON2
V
CC
OVRCUR3
PWRON3
GND
XT AL1
XT AL2
EXTMEM
PWRON4
OVRCUR4
RESET
DM4
DP4
DM3
CC
NC
OVRCUR3
NC
V
393837
202122
NC
NC
SUSPND
23
DP4
PWRON3
36
35
34
33
32
31
30
29
28
27
26
25
DM4
GND
XTAL1
XTAL2
NC
EXTMEM
NC
NC
PWRON4
NC
OVRCUR4
NC
RESET
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1998, Texas Instruments Incorporated
1
TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
description (continued)
The TUSB2040A supports bus-power and self-power modes. The power switching to the downstream ports can
either be controlled individually or ganged using external devices to switch power and to detect overcurrent
conditions. Outputs from the external power devices provide overcurrent inputs to the TUSB2040A OVRCUR
pins and in the case of an overcurrent condition, the corresponding PWRON pins will be disabled by the
TUSB2040A. In the GANGED operation, all PWRON
can be used.
The hub requires a 48-MHz clock signal to sample data from the upstream port and generate a synchronized
12-MHz USB clock signal. The hub supports the flexibility to use any device that generates a 48-MHz clock.
Because the majority of oscillators are active devices, the low power suspend mode of the TUSB2040A will not
function because there is no way to stop the oscillator from driving the internal clock. An oscillator with a TTL
output not exceeding 3.6 V can be used by connecting its output to the XT AL1 terminal and leaving the XT AL2
terminal open. For crystal or resonator implementations, use the XTAL1 terminal as the input and the XTAL2
terminal as the feedback path. Because the crystal is required to resonate at 48 MHz, a tuning circuit as shown
in Figure 8 may be required.
The upstream port and all downstream ports are USB-compliant transceivers. Every downstream port supports
both full-speed and low-speed connections by automatically setting the slew rate according to the speed of the
device attached to the port.
signals transition simultaneously , and any OVRCUR input
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
Hub Repeater
DP0 DM0
45
USB
Transceiver
Suspend/Resume
Logic and
Frame Timer
TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
23
XTAL1
OSC
SIE
22
18
21
XTAL2
RESET
EXTMEM
Port 1
Logic
Port 4
Logic
USB
Transceiver
16 17 7 8
DP4 DM4 DP1 DM1
NOTE: Terminal numbers shown are for the N package.
USB
Transceiver
SIE Interface
Logic
Hub/Device
Command
Decoder
Hub
Power
Logic
3, 1, 26, 19
2, 28, 25, 20
Serial
10
EEPROM
Interface
OVRCUR1 – OVRCUR4
PWRON1 – PWRON4
GANGED/SDA
9
BUSPWR
/SCL
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
TUSB2040A
I/O
DESCRIPTION
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
Terminal Functions
TERMINAL
NAME NPT
BUSPWR/SCL 9 10 I/O Power source input/EEPROM serial clock. When EXTMEM is low, BUSPWR/SCL is an active
DM0 5 2 I/O Root port USB differential data minus. DM0 paired with DP0 constitutes the upstream USB port.
DM1 – DM4 8, 12,
DP0 4 1 I/O Root port USB differential data plus. DP0 paired with DM0 constitutes the upstream USB port.
DP1 – DP4 7, 11,
GANGED/SDA 10 11 I/O Power switching and overcurrent detection mode/EEPROM serial data I/O. When EXTMEM is
GND 6, 24 3, 36 Ground. GND terminals must be tied to ground for proper operation.
EXTMEM 21 32 I EEPROM read enable. When EXTMEM is low, it disables the serial EEPROM interface of the
OVRCUR1 –
OVRCUR4
PWRON1 –
PWRON4
RESET 18 25 I Reset. RESET is an active low TTL input with hysteresis and must be asserted at power up. When
SUSPND 20 O Suspend status. SUSPND is an active high output that is available for external logic power down
V
CC
XTAL1 23 35 I Crystal 1. XTAL1 is a 48-MHz crystal input with 50% duty cycle. Operation at 48-MHz is four times
XTAL2 22 34 O Crystal 2. XTAL2 is a 48-MHz crystal output. Operation at 48-MHz is four times the USB full-speed
15, 17
14, 16
3, 1,
26, 19
2, 28,
25, 20
13, 27 15, 41 3.3-V supply voltage
7, 14,
19, 24
6, 13,
18, 23
48, 46,
38, 27
47, 44,
37, 29
low input that indicates whether the ports and the hub derive power from the bus or the local
supply. When EXTMEM is high, BUSPWR
EEPROM with a 100 µA internal pulldown. This standard TTL input must not change dynamically
during operation.
I/O USB differential data minus. DM1 – DM4 paired with DP1 – DP4 support up to four downstream
USB ports.
I/O USB differential data plus. DP1 – DP4 paired with DM1 – DM4 support up to four downstream
USB ports.
low, GANGED/SDA selects between gang or per port switching for the overcurrent detection of
the downstream ports. When EXTMEM is high, GANGED/SDA acts as a tri-state serial data I/O
to and from the EEPROM with a 100 µA internal pull-down. This standard TTL input must not
change dynamically during operation.
device. Pins 9 and 10 are configured as BUSPWR
is high, it enables the serial EEPROM interface and pins 9 and 10 are configured as SCL and
SDA, respectively.
I Overcurrent indicators. OVRCUR1 – OVRCUR4 are active low, standard TTL inputs. One
overcurrent indicator is available for each of the four downstream ports. In GANGED mode, one
implementation is to tie these inputs together . Alternatively , one OVRCUR
with the remaining OVRCUR
O Power-on/-off control signals. PWRON1 – PWRON4 are active low, open-drain outputs. One
power-on/-off control switch is used for each of the four downstream ports. In GANGED mode,
all outputs are switched together.
RESET
is asserted, it initializes all logic.
operations. During the SUSPEND mode, SUSPND is high. SUSPND is low for normal operation.
the USB full-speed bit rate of 12 Mbps.
bit rate of 12 Mbps. This terminal is left open when using an oscillator.
pins tied to VCC.
/SCL acts as a tri-state serial clock output to the
and GANGED, respectively. When EXTMEM
input pin may be used
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
Input voltage range, V
Output voltage range, V
Input clamp current, I
Output clamp current, I
Storage temperature range, T
†
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.
NOTE 1: All voltage levels are with respect to GND.
4
(see Note 1) –0.5 V to 3.8 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
–0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
–0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
, (VI < 0 V or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IK
, (VO < 0 V or V
OK
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
> VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
†
VOHHigh-level output voltage
USB data lines
V
USB data lines
V
Positi
V
N
V
I
(V
VT–)
IOZHigh-impedance output current
ICCInput supply current
TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
Input voltage, TTL/LVCMOS, V
Output voltage, TTL/LVCMOS, V
High-level input voltage, signal-ended receiver, V
Low-level input voltage, signal-ended receiver, V
High-level input voltage, TTL/LVCMOS, V
Low-level input voltage, TTL/LVCMOS, V
Operating free-air temperature, T
External series, differential driver resistor, R
Operating (dc differential driver) high speed mode, f
Operating (dc differential driver) low speed mode, f
Common mode, input range, differential receiver , V
Input transition times, tt, TTL/LVCMOS 0 6 ns
CC
I
O
IH(REC)
IL(REC)
IH(TTL)
IL(TTL)
A
(DRV)
(OPRH)
(OPRL)
(ICR)
electrical characteristics over recommended ranges of operating free-air temperature and supply
voltage (unless otherwise noted)
3 3.3 3.6 V
0 V
0 V
2 V
2 V
0 70 °C
22 (–5%) 22 (+5%) Ω
0.8 2.5 V
CC
CC
CC
0.8 V
CC
0.8 V
12 Mb/s
1.5 Mb/s
V
V
V
V
PARAMETER TEST CONDITIONS MIN MAX UNIT
p
V
OL
IT+
IT–
hys
I
IL
I
IH
z
o(DRV)
V
ID
†
Applies for input buffers with hysteresis
‡
Applies for open drain buffers
Low-level output voltage
ve input threshold voltage
egative-input threshold voltage
nput hysteresis†
p
Low-level input current TTL/L VCMOS VI = GND –1 µA
High-level input current TTL/LVCMOS VI = V
Driver output impedance USB data lines Static VOH or V
Differential input voltage USB data lines 0.8 V ≤ V
p
pp
T+
p
–
R
= 15 kΩ, to GND 2.8 3.6
(DRV)
IOH = –12 mA (without R
TTL/LVCMOS IOL = 4 mA 0.5
R
= 1.5 k Ω to 3.6 V 0.3
(DRV)
IOL = 12 mA (without R
TTL/LVCMOS 2 V
Single-ended
TTL/LVCMOS 0.8 V
Single-ended
TTL/LVCMOS 0.25 0.7 V
Single-ended 0.8 V ≤ V
TTL/LVCMOS V = VCC or GND‡ ±10 µA
USB data lines 0 V ≤ VO ≤ V
0.8 V ≤ V
0.8 V ≤ V
Normal operation 100 mA
Suspend mode 1 µA
≤ 2.5 V 1.8 V
ICR
≤ 2.5 V 1 V
ICR
≤ 2.5 V 300 500 mV
ICR
CC
CC
OL
≤ 2.5 V 0.2 V
ICR
) VCC –
(DRV)
) 0.5
(DRV)
7.1 19.9 Ω
0.5
±10 µA
1 µA
V
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
TUSB2040A
4-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROM INTERFACE
SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998
differential driver switching characteristics over recommended ranges of operating free-air
temperature and supply voltage, C
full speed mode
PARAMETER TEST CONDITIONS MIN MAX UNIT
t
r
t
f
t
(RFM)
V
O(CRS)
low speed mode
t
r
t
f
t
(RFM)
V
O(CRS)
Transition rise time for DPor DM See Figure 1 and Figure 2 4 20 ns
Transition fall time for DPor DM See Figure 1 and Figure 2 4 20 ns
Rise/fall time matching (tr/tf) x 100 90 110 %
Signal crossover output voltage 1.3 2.0 V
PARAMETER TEST CONDITIONS MIN MAX UNIT
Transition rise time for DPto DM CL = 50 pF to 350 pF, See Figure 1 and Figure 2 75 300 ns
Transition fall time for DPto DM CL = 50 pF to 350 pF, See Figure 1 and Figure 2 75 300 ns
Rise/fall time matching (tr/tf) x 100 80 120 %
Signal crossover output voltage CL = 50 pF to 350 pF 1.3 2.0 V
= 50 pF unless otherwise noted (see Figures 1 and 2)
L
DM
DP
DP
DM
Characterization
measurement point
22 Ω
15 kΩ
22 Ω
15 kΩ
V(
TERM)
Full
C
L
Low
C
L
Figure 1. Differential Driver Switching Load
10%
90%
t
r
90%
10%
Figure 2. Differential Driver Timing Waveforms
= 2.8 V
1.5 kΩ
t
f
V
OH
V
OL
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265