plastic QSOP (Q)
16-pin 173-mil wide plastic TSSOP (L)
20-contact TQFN (ZH)
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
Description
The PI3CH281 is a 2-channel, 4:1 Multiplexer/Demultiplexer with
3-state outputs. The switch introduces no additional ground bounce
noise or propagation delay.
The PI3CH281 device is very useful in switching signals that have
high bandwidth (300 MHz).
PI3CH281
Block Diagram
Pin Configuration
(1)
Note:
1. N.C, = No internal connection
I
A
0
EN
S
0
S
1
I
A
1
I
A
2
I
A
3
I
B
0
I
B
1
I
B
2
I
B
3
Y
A
Y
B




06-0247 2
PS8726D 05/10/06
PI3CH281
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
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 +6.0V
DC Output Current................................................................... 120mA
Power Dissipation ....................................................................... 0.5W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS 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 re-
liability.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
DC Electrical Characteristics, 3.3V Supply
(Over the Operating Range, T
A
= 40°C to +85°C, V
CC
= 3.3V ±10%)
Parameters
(4)
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
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
1.3
1.8
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
±1
µA
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
±1
I
OZH
High Impedance Output Current 0 Y, In V
CC
±1
R
ON
Switch On-Resistance
(3)
V
CC
= Min., V
IN
= 0V,
I
ON
= 48 mA or 64mA
4
6 V
CC
= Min., V
IN
= 3.6V, I
ON
= 15 mA
5
8
Pin Description
Pin Name
Description
I
A
N
,
I
B
N
Data Inputs
S
0-1
Select Inputs
EN
Enable
Y
A
to Y
B
Data Outputs
GND
Ground
V
CC
Power
Truth Table
(1)
Enable
Select
EN
S
1
S
0
Y
Function
H
X
X
Hi-Z
Disable
L
L
L
I
0
S
1-0
= 0
L
L
H
I
1
S
1-0
= 1
L
H
L
I
2
S
1-0
= 2
L
H
H
I
3
S
1-0
= 3
Note:
1. H=High Voltage Level; L=Low Voltage Level
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 Y and In pin at indicated current through the switch. On-Resistance is determined
by the lower of the voltages on the two (Y, In) pins.
4. This parameter is determined by device characterization but is not production tested.
06-0247 3
PS8726D 05/10/06
PI3CH281
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
Notes:
1. This parameter is determined by device characterization but is not production tested.
Capacitance
(T
A
= 25°C f = 1 MHz)
Parameters
(1)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.0
pF
C
OFF(IN)
In Capacitance, Switch Off
3.5
C
OFF(Y)
Y Capacitance, Switch Off
12
C
ON
Y/In Capacitance, Switch On
15.0
Power Supply Characteristics
Parameters
Description
Test Conditions
(1)
Min.
Typ.
Max.
Units
I
CC
Quiescent Power Supply Current
V
CC
= 3.6V, V
IN
= GND or V
CC
0.8
mA
DC Electrical Characteristics, 2.5V Supply
(Over Operating Range, T
A
= 40°C to +85°C, V
CC
= 2.5V ± 10%)
Parameters
(4)
Description
Test Conditions
(1)
Min. Typ.
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
1.8
V
CC
+ 0.3
V
V
IL
Inout LOW Voltage
Guaranteed Logic LOW Level
0.3
0.8
V
IK
Clamp Diode Voltage
V
CC
= Max., I
IN
= 6mA
0.7
1.8
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
±1
µA
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
±1
I
OZH
High Impedance Current
0 Y, In V
CC
±1
R
ON
Switch On-Resistance
(3)
V
CC
= Min., V
IN
=0.0V,
I
ON
= 48mA
6
8 V
CC
= Min., V
IN
= 2.25V,
I
ON
= 15mA
7
14
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
= 2.5V, T
A
= 25°C ambient and maximum loading.
3. Measured by the voltage drop between Y and In pin at indicated current through the switch. On-Resistance is determined
by the lower of the voltages on the two (Y, In) pins.
4. This parameter is determined by device characterization but is not production tested.
06-0247 4
PS8726D 05/10/06
PI3CH281
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. The 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 0.30ns 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 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 3.3V Operating Range
Parameters
Description
Conditions
(1)
Com.
Units
Min.
Typ.
Max.
t
PLH
t
PHL
Propogation Delay
(2,3)
Y to In, In to Y
See Test Diagram
0.3
ns
t
PZH
t
PZL
Enable Time S or EN to Y or In
See Test Diagram
1.5
9.0
t
PHZ
t
PLZ
Disable Time S or EN to Y or In
1.5
9.0
Switching Characteristics over 2.5V Operating Range
Parameters
Description
Conditions
(1)
Com.
Units
Min.
Max.
t
PLH
t
PHL
Propogation Delay
(2,3)
Y to In, In to Y
See Test Diagram
0.3
ns
t
PZH
t
PZL
Enable Time S or EN to Y or In
See Test Diagram
1.5
15.0
t
PHZ
t
PLZ
Disable Time S or EN to Y or In
1.5
12.0
Dynamic Electrical Characteristics Over the Operating Range
(T
A
= 40º to +85º, V
CC
= 3.3V ± 10%)
Parameter
Description
Test Condition
Min.
Typ.
Max.
Units
X
TALK
Crosstalk
See Test Diagram
60
dB
O
IRR
Off-Isolation
See Test Diagram
60
BW
3dB Bandwidth
See Test Diagram
200
300
MHz
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. The 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 0.30ns 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 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.
06-0247 5
PS8726D 05/10/06
PI3CH281
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
Test Circuit for Electrical Characteristics
Notes:


C
L
= Load capacitance: includes jig and probe capacitance.


R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator


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.


All input impulses are supplied by generators having the following characteristics: PRR 10 MHz, Z
O
= 50-ohm, t
R
2.5ns, t
F
2.5ns.


The outputs are measured one at a time with one transition per measurement.
Test Circuit for Dynamic Electrical Characteristics
RT
10pF
CL
VCC
VIN
VOUT
200 200 6.0V
Pulse
Generator
D.U.T
V
CC
D.U.T
T1
R1
S1
HP11667A
50 10
pF
HP4195A
Switch Positions
Test
Switch
t
PLZ
, t
PZL

6.0V
t
PHZ
, t
PZH

GND
Prop Delay
Open
06-0247 6
PS8726D 05/10/06
PI3CH281
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
Switching Waveforms
Pulse Skew - t
SK(p)
Voltage Waveforms Enable and Disable Times
Input
t
PLH
2.5V
2.5V
2.5V
2.5V
t
PHL
3.5V
1.5V
Output
V
OH
V
OL
tPLZ
1.25V
1.25V
2.5V
VOH
0V
VDD/2
VDD/2
tPHZ
tPZL
tPZH
Output
Output
VOL +0.3V
VOL
VOH
VOH -0.3V
S or EN
VOL
Input
Output
tPLH
tSK(p) = I tPHL tPLH I
tPHL
3.5V
2.5V
2.5V
VOL
VOH
1.5V
06-0247 7
PS8726D 05/10/06
PI3CH281
Low Voltage, High Bandwidth, 2-Channel, 4:1
Mux/DeMux, NanoSwitch with Single Enable
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, EN may be
driven LOW to 0V and HIGH to 3.6V. Driving EN Rail-to-Rail
®
minimizes power consumption.
Power Supply-Sequencing
Proper power supply sequencing is recommended for all CMOS devices. A