1
PS8161F 09/23/04
Description
Pericom Semiconductor's PI3B3384 and PI3B32384 are 3.3 Volt, 10-
bit, 2-port bus switches designed with a low On-Resistance allowing
inputs to be connected directly to outputs. The bus switch creates
no additional propagational delay or additional ground bounce
noise. Switches are turned ON by the Bus Enable (BE) input signal.
Two bus enable signals are provided, one for each of the upper and
lower five bits of the two 10-bit buses. The PI3B32384 is designed
with an internal 25-ohm resistor reducing noise reflection in high-
speed applications.
BEA
B0
A0
A1
B1
B2
A2
A3
B3
B4
A4
GND
Vcc
B9
A9
A8
B8
B7
A7
A6
B6
B5
A5
BEB
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Pin Configuration
Pin Description
Pin Name
Description
BEA, BEB
Bus Enable Inputs (Active LOW)
A0-A9
Bus A
B0-A9
Bus B
GND
Ground
V
CC
Power
Features
Near-Zero propagation delay
Low noise, 25-ohm version (PI3B32384)
5-ohm switches connect inputs to outputs (PI3B3384)
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)
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Function
BE
A
BE
B
B
0-B4
B
5-B9
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A
0-A4
Hi-Z
Connect
H
L
Hi-Z
A
5-A9
Connect
L
L
A
0-A4
A
5-A9
Truth Table
(1)
Block Diagram
PI3B3384
PI3B32384 (25
)
3.3V, 10-Bit, 2-Port, NanoSwitchTM
Notes:
1. H = High Voltage Level
X = Don't Care
L = Low Voltage Level
Hi-Z =High Impedance
24-Pin
Q, L
BE
A
A
4
A
0
B
4
B
0
A
9
A
5
B
9
B
5
BE
B
A
B
BE
PI3B3384, PI3B32384(25
)
3.3V, 10-Bit, 2-Port NanoSwitch
2
PS8161F 09/23/04
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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
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.
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
OFF
Off Current
V
CC
= 0, V
OUT
= 3
TO
3.3V
--
--
10
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,
PI3B3384
--
5
8
I
ON
= 48mA or 64mA
PI3B32384
18
28
40
V
CC
= Min., V
IN
= 2.4V,
PI3B3384
--
10
17
I
ON
= 15mA
PI3B32384
18
35
50
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.)
PI3B3384, PI3B32384(25
)
3.3V, 10-Bit, 2-Port NanoSwitch
3
PS8161F 09/23/04
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.,
PI3B3384
--
0.1
3
A
Supply Current
V
IN
= GND or V
CC
PI3B32384
I
CC
Supply Current per
V
CC
= Max., V
IN
= 3.0V
(3)
--
--
750
A
Input @ TTL HIGH
PI3B3384 Switching Characteristics Over Operating Range
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 inputs 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.
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,
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(
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A
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t
x
B
,
x
B
o
t
x
A
C
L
F
p
0
5
=
R
L
0
0
5
=
5
2
.
0
s
n
t
H
Z
P
t
L
Z
P
e
m
i
T
e
l
b
a
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E
s
u
B
x
B
r
o
x
A
o
t
x
E
B
C
L
F
p
0
5
=
R
L
0
0
5
=
R
L
0
0
5
=
0
.
1
0
.
4
t
Z
H
P
t
Z
L
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B
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.
1
5
.
3
PI3B32384
Com.
Parameters Description
Conditions
(1)
Min.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
0.25
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
t
PZH
Bus Enable Time
C
L
= 50pF,
1.0
4.0
ns
t
PZL
BE
X
to Ax or Bx
R
L
= 500
,
t
PHZ
Bus Disable Time
R
L
= 500
1.0
4.5
t
PLZ
BEx to Ax or Bx
PI3B32384 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.
PI3B3384, PI3B32384(25
)
3.3V, 10-Bit, 2-Port NanoSwitch
4
PS8161F 09/23/04
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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
PI3B3384, PI3B32384(25
)
3.3V, 10-Bit, 2-Port NanoSwitch
5
PS8161F 09/23/04
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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.
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Ordering Information
Ordering Code
Package Code
Package Type
PI3B3384Q
Q
24-pin QSOP
PI3B3384QE
Q
Pb-free & Green, 24-pin QSOP
PI3B3384L
L
24-pin TSSOP
PI3B3384LE
L
Pb-free & Green, 24-pin TSSOP
PI3B32384Q
Q
24-pin QSOP
PI3B32384QE
Q
Pb-free & Green, 24-pin QSOP
PI3B32384L
L
24-pin TSSOP
PI3B32384LE
L
Pb-free & Green, 24-pin TSSOP
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
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