1
PS8697A 07/23/04
Features
R
ON
is 4 typical
Low bit-to-bit skew: 200ps
Low Crosstalk: 27dB @ 250MHz
Near-Zero propagation delay: 250ps
Switching speed: 9ns
Channel On-Capacitance: 6pF (typical)
V
CC
Operating Range: +3.0V to +3.6V
ESD>2000V . . . Human Body Model
>500 MHz bandwidth (or data frequency)
Package (Pb-free & Green available):
-16-pin, 173-mil wide plastic TSSOP (L)
Application
Routes signals for USB 2.0
Description
Pericom Semiconductor's PI3USB series of logic circuits are
produced using the Company's advanced sub-micron CMOS
technology, achieving industry leading performance.
The PI3USB20 is a 8- to 4-Channel multiplexer/demultiplexer Video
Switch with Hi-Z outputs. Industry leading advantages include a
propagation delay of less than 250ps, resulting from its low channel
resistance and I/O capacitance. The device multiplexes differential
outputs from a USB Host device to one of two corresponding outputs.
The switch is bidirectional and offers little or no attenuation of the
high-speed signals at the outputs. It is designed for low bit-to-bit
skew, high channel-to-channel noise isolation and is compatible
with various standards, such as high speed USB 2.0 (480 Mb/s).
Block Diagram
Pin Description
PI3USB20
3.3V, Wide Bandwidth, 4-Channel,
2:1 Mux/DeMux USB 2.0 Switch w/ Single Enable
Y
3
Y
2
Y
1
Y
0
1
I
0
0
I
0
1
I
1
0
I
1
3
I
0
2
I
0
3
I
1
2
I
1
SEL
Truth Table
Function
SEL
Y
n
to
n
I
0
L
Y
n
to
n
I
1
H
V
DD
GND
Y
0
Y
1
Y
2
Y
3
GND
SEL
1
2
3
4
5
6
7
8
0
l
0
1
I
0
0
I
1
1
I
1
2
I
0
3
I
0
2
I
1
3
I
1
16
15
14
13
12
11
10
9
2
PI3USB20
3.3V, Wide Bandwidth, 4-Channel,
2:1 Mux/DeMux USB 2.0 Switch
PS8697A 07/23/04
DC Electrical Characteristics for USB 2.0 Switching over Operating Range
(T
A
= 40C to +85C, V
CC
= 3.3V 10%)
Paramenter
Description
Test
Conditions
Min.
Type
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed HIGH level
2.0
-
-
V
V
IL
Input LOW Voltage
Guaranteed HIGH level
-5.0
-
0.8
V
IK
Clamp Diode Voltage
V
CC
= Max., I
IN
= 18mA
-
-0.7
-1.2
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
-
-
5
A
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
-
-
5
R
ON
Switch On-Resistance
(3)
V
CC
= Min., 1.25V V
IN
V
CC,
I
IN
= 40mA
-
4
8
R
FLAT(ON)
On-Resistance Flatness
(4)
V
CC
= Min., V
IN
@ 1.5V and V
CC,
I
IN
= -40mA
-
1.0
-
R
ON
On-Resistance match from center
ports to any other port
(4)
V
CC
= Min., 1.5V V
IN
V
CC,
I
IN
= -40mA
-
0.9
2
Storage Temperature ......................................... 65C to +150C
Supply Voltage to Ground Potential ....................0.5V to +4.0V
DC Input Voltage .................................................0.5V to +5.5V
DC Output Current ........................................................... 120mA
Power Dissipation ................................................................ 0.5W
Note:
Stresses greater than those listed under MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other
conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
Notes:
1. For max. or min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, T
A
= 25C ambient and maximum loading.
3. Measured by the voltage drop between A and B pins at indicated current through the switch. On-Resistance is determined by the lower of the
voltages on the two (A & B) pins.
4. This parameter is determined by device characterization but is not production tested.
Capacitance
(T
A
= 25C, f = 1MHz)
Parameters
(4)
Description
Test Conditions
Type
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
2.0
3.0
pF
C
OFF
Port I Capacitance, Switch OFF
4.0
6.0
C
ON
Switch Capacitance, Switch ON
6.0
10.0
3
PI3USB20
3.3V, Wide Bandwidth, 4-Channel,
2:1 Mux/DeMux USB 2.0 Switch
PS8697A 07/23/04
Notes:
1. For max. or min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, T
A
= 25C ambient and maximum loading.
3. Per TTL driven input (control inputs only); A and B pins do not contribute to I
CC
.
Notes:
1. For max. or min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Guaranteed by design.
3. The bus switch contributes no propagational delay other than the RC delay of the On-Resistance of the switch and the load capacitance. The
time constant for the switch alone is of the order of 0.25ns for 10pF load. Since this time constant is much smaller than the rise/fall times of
typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side.
Power Supply Characteristics
Parameters
Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
I
CC
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
-
-
800
A
Dynamic Electrical Characteristics Over the Operating Range
(T
A
= 40C to +85C, V
CC
= 3.3V 10%, GND = 0V)
Parameters
Description
Test Conditions
Min.
Typ.
(1)
Max.
Units
X
TALK
Crosstalk
R
L
= 100, f = 250 MHz
-
-27
-
dB
O
IRR
OFF Isolation
-
-32
-
BW
Bandwidth -3dB
R
L
= 100
-
500
-
MHz
Switching Characteristics
Parameters
Description
Test
Conditions
Min.
Typ.
(1)
Max. Units
t
PD
Propagation Delay
(2,3)
-
0.25
ns
t
PZH
, t
PZL
Line Enable Time - SEL to Y
N
,
N
I
0,
I
N
0.5
-
15.0
t
PHZ
, t
PLZ
Line Disable Time - SEL to Y
N
,
N
I
0,
I
N
0.5
-
9.0
t
SK(o)
Output Skew between center port to any other port
(2)
-
0.1
0.2
t
SK(p)
Skew between opposite transitions of the same output (t
PHL
- t
PLH
)
(2)
-
0.1
0.2
4
PI3USB20
3.3V, Wide Bandwidth, 4-Channel,
2:1 Mux/DeMux USB 2.0 Switch
PS8697A 07/23/04
Test Circuit for Electrical Characteristics
(1)
Notes:
1. C
L
= Load capacitance: includes jig and probe capacitance.
2. R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator
3. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
4. All input impulses are supplied by generators having the following characteristics: PRR MHz, Z
O
= 50
, t
R
2.5ns, t
F
2.5ns.
5. The outputs are measured one at a time with on transition per measurement.
Test Circuit for Dynamic Electrical Characteristics
Switch Positions
Test
Switch
t
PLZ
, t
PZL
(output on I-side)
6.0V
t
PHZ
, t
PZH
(output on I-side)
GND
Prop Delay
Open
VCC
PI3USB20
T1
R1
S1
HP11667A
50-ohm
10pF
HP4195A
R
T
10pF
C
L
V
CC
V
IN
VOUT
200-ohm
200-ohm
6.0V
Pulse
Generator
D.U.T
5
PI3USB20
3.3V, Wide Bandwidth, 4-Channel,
2:1 Mux/DeMux USB 2.0 Switch
PS8697A 07/23/04
Voltage Waveforms Propagation Delay Times
Switching Waveforms
Output Skew - t
SK(o)
Pulse Skew - t
SK(p)
Voltage Waveforms Enable and Disable Times
Applications Information
Logic Inputs
The logic control inputs can be driven up to +3.6V regardless of the supply voltage. For example, given a +3.3V supply, the output
enables or select pins may be driven low to 0V and high to 3.6V. Driving IN Rail-to-Rail minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is advised for all CMOS devices. It is recommended to always apply V
CC
before applying signals
to the input/output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd
Data In
Data Out
at Channel X
Data Out
at Channel Y
tPLHX
tPHLX
3.5V
2.5V
2.5V
2.5V
I
tSK(o) = I tPLHy tPLHx I or I tPHLy tPHLx I
tSK(o)
tPLHy
tPHLy
VOH
VOL
VOL
VOH
1.5V
Input
Output
tPLH
tSK(p) = I tPHL tPLH I
tPHL
3.5V
2.5V
2.5V
VOL
VOH
1.5V
tPLZ
1.25V
1.25V
2.5V
VOH
0V
VOL
VDD/2
VDD/2
tPHZ
tPZL
tPZH
Output
Output
VOL +0.3V
VOH 0.3V
VOL
VOH
SEL
Input
t
PLH
2.5V
2.5V
2.5V
2.5V
t
PHL
3.5V
1.5V
Output
V
OH
V
OL
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