1
PS8148E 09/23/04
1
2
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7
8
9
10
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24
23
22
21
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19
18
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16
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13
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A9
GND
Vcc
BE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B9
Pin Name
Description
BE
Bus Enable Input (Active LOW)
A
0
9
Bus A
B
0
9
Bus B
GND
Ground
V
CC
Power
Pin Configuration
24-Pin
Q
Product Pin Description
Function
BE
A
09
Disconnect
H
Hi-Z
Connect
L
B
09
Truth Table
(1)
Notes: 1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Block Diagram
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PI3B3861
3.3V, 10-Bit, 2-Port, NanoSwitchTM
Description
Pericom's Semiconductor's PI3B3861 is a 10-bit, 3.3 volt, 2-port
bus switch designed with a low On-Resistance (5-ohm) allowing
inputs to be connected directly to outputs. The bus switch
creates no additional propagational delay or additional ground
bounce noise. The switches are turned ON by the Bus Enable
(BE) input signal.
Features
Near-Zero propagation delay
5-ohm switches connect inputs to outputs
Fast Switching Speed - 4.5ns (max.)
Ultra Low Quiescent Power (0.1A Typical)
Ideally suited for notebook applications
Packaging (Pb-free & Green available):
24-pin 150-mil wide plastic QSOP (Q)
24-pin 173-mil wide plastic TSSOP (L)
BE
A9
A0
B9
B0
A
B
BE
SW
SW
SW
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PI3B3861
3.3V, 10-Bit, 2-Port, NanoSwitch
2
PS8148E 09/23/04
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.0
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
8.0
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
16.0
pF
DC Electrical Characteristics
(Over the 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
V
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
A
I
OZH
High Impedance Output Current 0
A, B
V
CC
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
1.2
V
R
ON
Switch On Resistance
(3)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA or 64mA
5
8
V
CC
= Min, V
IN
= 2.4V, I
ON
= 15mA
10
17
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 +4.6V
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 ex-
tended periods may affect reliability.
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 pin 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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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PI3B3861
3.3V, 10-Bit, 2-Port, NanoSwitch
3
PS8148E 09/23/04
Power Supply Characteristics
Parameters Description
Test Conditions(1)
Min.
Typ(2) Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
0.1
3.0
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.0V(3)
750
A
Input @ TTL HIGH
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 TTL driven input (control input only); A and B pins do not contribute to I
CC
.
Switching Characteristics over Operating Range
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.
s
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A
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t
x
B
,
x
B
o
t
x
A
C
L
R
,
F
p
0
5
=
L
0
0
5
=
5
2
.
0
s
n
t
H
Z
P
t
L
Z
P
e
m
i
T
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l
b
a
n
E
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u
B
x
B
r
o
x
A
o
t
E
B
C
L
R
,
F
p
0
5
=
L
0
0
5
=
1
5
.
4
t
Z
H
P
t
Z
L
P
e
m
i
T
e
l
b
a
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D
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u
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x
B
r
o
x
A
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B
C
L
R
,
F
p
0
5
=
L
0
0
5
=
1
5
.
4
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, IN may be
driven low to 0V and high to 3.6V. Driving IN Rail-to-Rail minimizes power consumption.
Power-Supply Sequencing and Hot-Plug Information
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V
CC
and GND before applying signals to
input/output or control pins.
Rail-to-Rail is a registeredtrademark of Nippon Motorola, Ltd.
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PI3B3861
3.3V, 10-Bit, 2-Port, NanoSwitch
4
PS8148E 09/23/04
Packaging Mechanical: 24-pin QSOP (Q)
Packaging Mechanical: 24-pin TSSOP (L)
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
typical
.007
.010
.228
.244
1
24
.150
.157
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.20
0.406
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.033
0.84
0.38
.015 x 45
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0-6
.008
.013
0.20
0.33
.303
.311
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
24
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
7.7
7.9
0.65
0.19
0.30
.007
.012
Max
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PI3B3861
3.3V, 10-Bit, 2-Port, NanoSwitch
5
PS8148E 09/23/04
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Ordering Information
Ordering Code
Package Code
Package Type
PI3B3861Q
Q
24-pin QSOP
PI3B3861QE
Q
Pb-free & Green, 24-pin QSOP
PI3B3861L
L
24-pin TSSOP
PI3B3861LE
L
Pb-free & Green, 24-pin T SSOP
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