1
PS8417E 09/07/04
Description
Pericom Semiconductor's PI3C3305 and PI3C3306 are 2.5V or
3.3 Volt, 2-bit bus switches designed with fast individual enables.
When enabled via the associated Bus Enable (BE) pin, the "A" pin
is directly connected to the "B" pin for that particular gate. The
bus switch introduces no additional propagation delay or additional
ground bounce noise.
The PI3C3306 device has active LOW enables, and the PI3C3305
has active HIGH enables. It is very useful in switching signals that
have high bandwidth (>400 MHz).
Features
Near-Zero propagation delay
5 switches connect inputs to outputs
High Bandwidth (>400 MHz)
Rail-to-Rail, 3.3V or 2.5V Switching
5V I/O Tolerant
2.5V Supply Voltage Operation
Permits Hot Insertion
Packaging (Pb-free & Green Available):
8-pin 173-mil wide plastic TSSOP
8-pin 118-mil wide plastic MSOP
Applications
High Bandwidth Data Switching
Hot Docking
PI3C3305 Block Diagram
PI3C3306 Block Diagram
PI3C3305
PI3C3306
2.5V/3.3V, High Bandwidth, Hot Insertion,
2-Bit, 2-Port Bus Switch w/ Individual Enables
PI3C3305 Pin Configuration
PI3C3306 Pin Configuration
BE1
A1
B1
GND
V
CC
BE2
B2
A2
BE1
A1
B1
GND
VCC
BE2
B2
A2
Pin Description
Pin Name
Description
BEn
Switch Enable (PI3C3305)
BEn
Switch Enable (PI3C3306)
A2-A1
Bus A
B2-B1
Bus B
V
CC
Power
GND
Ground
Truth Table
(1)
PI3C3306
BEn
PI3C3305
BEn
An
Bn
V
CC
Function
X
X
(2)
Hi-Z Hi-Z GND Disconnect
H
L
Hi-Z Hi-Z V
CC
Disconnect
L
H
Bn
An
V
CC
Connect
Notes:
1. H = High Voltage Level; L = Low Voltage Level;
Hi-Z = High Impedance; X = Don't Care
2. A pull-up resistor should be provided for power-up protection.
BE1
A1
B1
BE2
A2
B2
BE1
A1
B1
BE2
A2
B2
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PS8417E 09/07/04
PI3C3305/PI3C3306
2.5V/3.3V, High Bandwidth, Hot Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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 ex-
tended periods may affect reliability.
Storage Temperature ............................................................65C to +150C
Ambient Temperature with Power Applied ...........................40C to +85C
Supply Voltage to Ground Potential .......................................0.5V to +4.6V
DC Input Voltage ....................................................................0.5V to +5.5V
DC Output Current............................................................................... 120mA
Power Dissipation ................................................................................... 0.5W
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.5
pF
C
OFF
A/B Capacitance, Switch Off
5.0
C
ON
A/B Capacitance, Switch On
10.0
DC Electrical Characteristics
(Over Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
Parameters
Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
0.8
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
1
A
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
1
I
OZH
High Impedance Output
Current
0 A, B V
CC
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.73
1.2
V
R
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA or 60mA
5
7
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
8
15
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. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Measured by the voltage drop between A and B pin at indicated current through the switch. On-Resistance is determined by the lower of the
voltages on the two (A,B) pins.
5. This parameter is determined by device characterization but is not production tested.
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PS8417E 09/07/04
PI3C3305/PI3C3306
2.5V/3.3V, High Bandwidth, Hot Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
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
260
500
A
I
CC
Supply Current per
Input HIGH
V
CC
= Max.
V
IN
= 3.0V
(3)
750
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 3.3V, +25C ambient.
3. Per driven input (control input only); A and B pins do not contribute to I
CC
.
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
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 50pF 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 interaction with the load on the driven side.
Switching Characteristics over 2.5V Operating Range
Parameters
Description
Test Conditions
(1)
3305/3306
Units
Com
Min.
Max.
t
PLH
t
PHL
Propagation Delay
(2, 3)
A to B, B to A
C
L
= 50pF,
R
L
= 500
0.25
ns
t
PZH
t
PZL
Bus Enable Time
C
L
= 50pF,
R
L
= 500,
R = 500
1.5
9.8
t
PHZ
t
PLZ
Bus Disable Time
1.5
8.3
Switching Characteristics over 3.3V Operating Range
Parameters
Description
Test Conditions
(1)
3305/3306
Units
Com
Min.
Max.
t
PLH
t
PHL
Propagation Delay
(2, 3)
A to B, B to A
C
L
= 50pF,
R
L
= 500
0.25
ns
t
PZH
t
PZL
Bus Enable Time
C
L
= 50pF,
R
L
= 500,
R = 500
1.5
6.5
t
PHZ
t
PLZ
Bus Disable Time
1.5
5.5
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PS8417E 09/07/04
PI3C3305/PI3C3306
2.5V/3.3V, High Bandwidth, Hot Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
4.0
2.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
V
OUT
, (V)
VIN, (V)
VCC =
3.3V
3.1V
2.9V
2.7V
2.5V
2.3V
3.6V
3.8V
3.4V
3.2V
3.0V
2.8V
Output Voltage vs. Input Voltage over Various Supply Voltages
Output Voltage vs. Input Voltage over Various Supply Voltages
Application Information
Logic Inputs
The logic control inpus can be driven up to +3.6V regardless of the supply voltage. For example, given a +3.3V supply, IN may be
driven LOW to 0V and HIGH to 3.6V. Driving IN Rail-toRail 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
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PS8417E 09/07/04
PI3C3305/PI3C3306
2.5V/3.3V, High Bandwidth, Hot Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
Packaging Mechanical: 8-Pin MSOP (U)
Packaging Mechanical: 8-Pin TSSOP (L)
15
MAX
15
MAX
Detail A
Detail A
.112
.120
2.85
3.05
.114
.122
2.90
3.10
.114
.122
2.90
3.10
.010
0
- 6
15 Max.
15 Max.
0.25
Gauge
Plane
.003
.012
.016
.028
.037
0.40
0.70
0.95
REF
0.07
0.30
.003
.012
0.07
0.30
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