PRELIMINARY DATASHEET
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
IDTUS8031
Description
The IDTUS8031 is a low power, dual SPST 2-port hi-speed
USB 2.0 switch. This part is configured as a single pole,
single throw switch and is optimized for switching or
isolating a hi-speed (480 Mbps) source or a hi-speed and
full-speed (12 Mbps) source. The IDTUS8031 is compatible
with the requirements of USB2.0 and features an extremely
low ON capacitance (C
ON
) of 3.7 pF. The wide bandwidth of
this device (>720 MHz) exceeds the bandwidth needed to
pass the 3rd harmonic, resulting in signals with minimum
edge and phase distortion. Superior channel-to-channel
crosstalk also minimizes interference.
The IDTUS8031 contains circuitry on the D+/D- pins which
allows the device to withstand an overvoltage condition.
This device is also designed to minimize current
consumption even when the control voltage applied to the
OE pin is lower than the supply voltage (V
CC
). This feature
is especially valuable to portable applications such as cell
phones, allowing for direct interface with the general
purpose I/Os of the baseband processor.
Features
•
Low On capacitance, 3.7 pF (typical)
•
Low On resistance, 6.5Ω (typical)
•
Low power consumption (1 µA maximum)
– 10 µA maximum ICCT over and expanded control
voltage range (VIN=2.6 V, V
CC
=4.3 V)
•
Wide -3dB bandwidth, > 720 MHz
•
8K I/O to GND ESD protection
•
Power OFF protection when V
CC
= 0V, D+/D- pins can
tolerate up to 4.3 V
•
Packaged in RoHS compliant 8-pin MicroPak™ (1.6 x 1.6
mm) or 8-pin US8 (3.1 mm wide)
Applications
•
Notebooks, PDAs
•
Cellular phones, Digital cameras
•
LCD monitors, TVs, Set-top Boxes
Block Diagram
V
CC
Base Band
Processor or FS
USB Controller
IDTUS8031
D+
USB
Connector
D-
OE
HS USB
Controller
IDT™
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
1
IDTUS8031
REV C 112807
IDTUS8031
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
USB SWITCH
Pin Assignment
(MicroPak)
Pin Assignment
(US8)
Analog Symbol
HSD+
D+
HSD-
D-
OE
Control
Truth Table
OE
H
L
Function
Disconnect
D+, D- = HSD
Pin Descriptions
Pin Name
OE
D+, D-, HSD+, HSD-
NC
Pin Description
Bus switch enable.
Data ports.
No connect.
IDT™
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
2
IDTUS8031
REV C 112807
IDTUS8031
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
USB SWITCH
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the IDTUS8031. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range. All voltages referenced to
ground.
Symbol
V
CC
V
S
V
IN
Supply Voltage
DC Input Voltage
1
DC Switch Voltage
1
HSD
D+, D-
Parameter
Rating
-0.5 V to 4.6 V
-0.5 V to 4.6 V
-0.5 V to V
CC
to 0.3 V
-0.5 V to 4.6 V
-50 mA
50 mA
-65°C to 150°C
7.5 kV
8 kV
DC Input Diode Current
DC Output Current
Storage Temperature
ESD (Human Body Mode)
All Pins
I/O to GND
Recommended Operating Conditions
2
Symbol
V
CC
V
IN
Supply Voltage
DC Switch Voltage
DC Input Diode Current
Storage Temperature
Parameter
0V to V
CC
0V to V
CC
Rating
3.0 V to 4.3 V
-40°C to +85°C
Note 1: The input and output negative voltage ratings may be exceeded if the input and output diode current ratings
are observed. DC switch voltage may never exceed 4.6V
Note 2: Control input must be held HIGH or LOW and it must not float.
IDT™
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
3
IDTUS8031
REV C 112807
IDTUS8031
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
USB SWITCH
DC Electrical Characteristics
Unless stated otherwise, typical values are at 25°C
T
A
= -40°C to +85°C
Symbol
V
IK
V
IH
V
IL
I
IN
I
OZ
I
OFF
R
ON
R
ON
R
ON
Flatness
I
CC
I
CCT
Parameter
Clamp Diode Voltage
Input Voltage HIGH
Input Voltage LOW
Control Input Leakage
OFF State Leakage
Power OFF Leakage
Current (D+, D-)
Conditions
I
IN
= -18 mA
V
CC
(V)
3.0
3.0 to 3.6
4.3
3.0 to 3.6
4.3
Min.
0
1.3
1.7
Typ.
Max. Units
-1.2
V
V
0.5
0.7
V
V
IN
= 0V to V
CC
0 < HSD < V
CC
V
IN
= 0V to 4.3 V
V
CC
= 0V
V
IN
= 0.4 V,
I
ON
= -8 mA
V
IN
= 0.4 V,
I
ON
= -8 mA
V
IN
= 0V to 1.0 V,
I
ON
= -8 mA
V
IN
= 0V or V
CC
,
I
OUT
= 0
V
IN
= 2.6 V, V
CC
= 4.3 V
4.3
4.3
0
3.0
3.0
3.0
4.3
4.3
-1.0
-2.0
-2.0
6.5
0.35
2.0
1.0
2.0
2.0
10.0
µA
µA
µA
Ω
Ω
Ω
Switch On Resistance
1
Delta R
ON 2
R
ON
Flatness
1
Quiescent Supply Current
Increase in I
CC
Current per
Control voltage and
V
CC
levels
1.0
10.0
µA
µA
Notes:
1. Measured by the voltage drop between Dn, HSD, Dn pins at the indicated current through the switch. On Resistance is
determined by the lower of the voltage on the two ports.
2. Guaranteed by design.
AC Electrical Characteristics
Unless stated otherwise, typical values are for V
CC
= 3.3 V at 25°C
T
A
= -40°C to +85°C
Symbol
t
ON
t
OFF
t
PD
T
BBM
O
IRR
Parameter
Turn ON Time, OE to output
Conditions
V
IN
= 0.8 V, R
L
= 50Ω C
L
= 5 pF
,
V
CC
(V)
3.0 to 3.6
3.0 to 3.6
3.3
3.0 to 3.6
3.0 to 3.6
3.0 to 3.6
3.0 to 3.6
Min.
Typ.
15.0
12.0
0.25
Max. Units
30.0
25.0
ns
ns
ns
6.5
ns
dB
dB
MHz
Turn OFF Time, OE to output V
IN
= 0.8 V, R
L
= 50Ω C
L
= 5 pF
,
Propagation Delay
1
R
L
= 50Ω C
L
= 5 pF
,
Break-Before-Make
Non-adjacent Channel
Crosstalk
-3dB Bandwidth
V
IN
= 0.8 V, R
L
= 50Ω C
L
= 5 pF
,
R
T
= 50Ω f = 240 MHz
,
R
T
= 50Ω C
L
= 0 pF
,
R
T
= 50Ω C
L
= 5 pF
,
Note 1:
Guaranteed by design.
2.0
-35.0
-55.0
720
550
OFF Isolation (non-adjacent) R
T
= 50Ω f = 240 MHz
,
Xtalk
BW
IDT™
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
4
IDTUS8031
REV C 112807
IDTUS8031
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
USB SWITCH
USB Hi-Speed Related AC Electrical Characteristics
T
A
= -40°C to +85°C
Symbol
t
SK(O)
t
SK(P)
t
J
Parameter
Channel-to-channel Skew
1
Skew of the Opposite Transitions
of the Same Output
1
Total Jitter
1
Conditions
C
L
= 5 pF
C
L
= 5 pF
R
L
= 50Ω, C
L
= 5 pF,
tR = tF = 500 ps at 480 Mbps
(PRBS = 2
15
- 1)
V
CC
(V)
3.0 to 3.6
3.0 to 3.6
3.0 to 3.6
Min.
Typ.
50.0
20.0
200
Max. Units
ps
ps
ps
Note 1:
Guaranteed by design.
Capacitance
T
A
= -40°C to +85°C
Symbol
C
IN
C
ON
C
OFF
Parameter
Control Pin Input Capacitance
D1
n
, D2
n
, Dn ON Capacitance
D1
n
, D2
n
, OFF Capacitance
V
CC
= 0V
Conditions
V
CC
= 3.3 V, OE = 0V
V
CC
and OE = 3.3 V
Min.
Typ.
1.0
3.7
1.7
Max. Units
pF
pF
pF
IDT™
LOW POWER DUAL SPST HI-SPEED USB 2.0 (480MBPS) SWITCH
5
IDTUS8031
REV C 112807
