PI3C3305
PI3C3306
2.5V/3.3V, High-Bandwidth, Hot-Insertion,
2-Bit, 2-Port Bus Switch w/ Individual Enables
Features
• Near-Zero propagation delay
• 5Ω 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):
– 8-pin 173-mil wide plastic TSSOP
– 8-pin 118-mil wide plastic MSOP
Description
Pericom Semiconductor’s PI3C3305 and PI3C3306 are 2.5 volt 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).
Applications
• High Bandwidth Data Switching
• Hot Docking
PI3C3306 Block Diagram
A1
B1
BE1
A2
B2
BE2
B2
B1
PI3C3305 Block Diagram
A1
BE1
A2
BE2
PI3C3306 8-Pin Configuration
PI3C3305 Pin Configuration
BE1
A1
B1
GND
V
CC
BE2
B2
A2
BE1
A1
B1
GND
VCC
BE2
B2
A2
PI3C3306 10-Contact Configuration
GND
9
7
6
4
5
BE1
VCC
8
BE2
B2
A2
Pin Description
Pin Name
BEn
BEn
A2-A1
B2-B1
V
CC
GND
Description
Switch Enable (PI3C3305)
Switch Enable (PI3C3306)
Bus A
Bus B
Power
Ground
A1
B1
10
1
2
3
11-0003
1
GND
VCC
01/11/11
2.5V/3.3V, High Bandwidth, Hot-Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
Truth Table
(1)
PI3C3306
BEn
X
H
L
PI3C3305
BEn
X
(2)
L
H
An
Bn
V
CC
GND
V
CC
V
CC
Function
Disconnect
Disconnect
Connect
Hi-Z Hi-Z
Hi-Z Hi-Z
Bn
An
PI3C3305/PI3C3306
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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ............................................................ –65°C to +150°C
Ambient Temperature with Power Applied ........................... –40°C to +85°C
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
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.
DC Electrical Characteristics
(Over Operating Range, T
A
=
–40°C to +85°C, V
CC
= 3.3V ±10%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
R
ON
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output
Current
Clamp Diode Voltage
Switch On Resistance
(3)
Test Conditions
(1)
Min.
2.0
–0.5
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
=
Max.,
V
IN
= V
CC
V
CC
=
Max.,
V
IN
= GND
0
≤
A, B
≤
V
CC
V
CC
=
Min.,
I
IN
= –18mA
V
CC
= Min.,
V
IN
= 0.0V,
I
ON
=
48mA or 60mA
V
CC
= Min.,
V
IN
= 2.4V, I
ON
= 15mA
Typ.
(2)
Max.
0.8
±1
±1
±1
Units
V
µA
V
Ω
–0.73
5
8
–1.2
7
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
= 25°C ambient and maximum loading.
3. 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.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OFF
C
ON
Description
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
V
IN
= 0V
Test Conditions
Typ.
3.5
5.0
10.0
pF
Units
Notes:
1. This parameter is determined by device characterization but is not production tested.
11-0003
2
01/11/11
2.5V/3.3V, High Bandwidth, Hot-Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
Description
Quiescent Power
Supply Current
Supply Current per
Input HIGH
Test Conditions
(1)
V
CC
=
Max.
V
CC
= Max.
V
IN
= GND
or
V
CC
V
IN
= 3.0V
(3)
Min.
Typ.
(2)
260
Max.
500
µA
750
Units
PI3C3305/PI3C3306
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, +25°C ambient.
3. Per driven input (control input only); A and B pins do not contribute to ΔI
CC
.
Switching Characteristics over 3.3V Operating Range
3305/3306
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(2, 3)
A to B, B to A
Bus Enable Time
Bus Disable Time
Test Conditions
(1)
Min.
C
L
= 50pF
R
L
= 500Ω
C
L
= 50pF
R
L
= 500Ω
R = 500Ω
1.5
1.5
Com
Max.
0.25
6.5
5.5
ns
Units
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
3305/3306
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(2, 3)
A to B, B to A
Bus Enable Time
Bus Disable Time
Test Conditions
(1)
Min.
C
L
= 50pF
R
L
= 500Ω
C
L
= 50pF
R
L
= 500Ω
R = 500Ω
1.5
1.5
Com
Max.
0.25
9.8
8.3
ns
Units
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.
11-0003
3
01/11/11
2.5V/3.3V, High Bandwidth, Hot-Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
Test Circuits
V
CC
V
IN
R
T
V
OUT
50pF
C
L
500Ω
500Ω
6V
Open
Pulse
Generator
D.U.T.
PI3C3305/PI3C3306
Switch Position
Test
Disable LOW
Enable LOW
Disable HIGH
Enable HIGH
tPD
Switch
6V
6V
GND
GND
Open
Definitions:
C
L
= Load capacitance (includes jig and probe
capacitance)
R
T
= Termination resistance (should be equal to
Z
OUT
of the pulse generator)
Enable and Disable Timing
Enable
Control
Input
t
PZL
Output
Normally
Low
t
PZH
Output
Normally
High
1.6V
t
PLZ
Disable
Propagation Delay
3V
1.5V
0V
Same Phase
Input Translation
t
PLH
Output
3V
1.5V
t
PHL
V
OH
1.5V
t
PHL
1.5V
V
OL
t
PLH
3V
1.5V
0V
1.5V
0V
Switch
3V
1.5V
t
PZH
0.3V
3V
VOL
VOH
0V
Switch
GND
1.5V
0V
0.3V
Opposite Phase
Input Transistion
1. Input Control Enable = Low Input Control Device = High
2. Pulse Generator total pulses
Rate ≤1.0 MHz; Z
OUT
≤50-Ohms;
tF, tR
≤2.5ns
11-0003
4
01/11/11
2.5V/3.3V, High Bandwidth, Hot-Insertion,
2-Bit, 2-Port Bus Switch with Individual Enables
PI3C3305/PI3C3306
4.0
VCC = 3.3V
3.1V
2.9V
2.7V
2.5V
2.3V
3.8V
3.6V
3.4V
3.2V
3.0V
2.8V
VOUT, (V)
2.0
0.0
0.0
1.0
2.0
VIN, (V)
3.0
4.0
5.0
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.
11-0003
5
01/11/11
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