1
PS8336C 09/24/04
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GND
24
48
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45
44
43
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41
40
39
38
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36
35
34
33
32
31
30
29
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25
VCC
B
19
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19
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18
B
18
B
17
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16
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15
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BE
B
VCC
B
14
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11
B
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B
10
A
10
BE
D
Features
Near-Zero propagation delay
5-ohm switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power 32X384 (0.1A typical)
Ideally suited for notebook applications
Fast Switching Speed - 4.5ns max.
TTL - compatible control of input levels
Packaging (pb-free & Green available):
48-pin 150-mil wide plastic BQSOP (B)
Block Diagram
Pin Configuration
Pin Description
Truth Table
(1)
Note:
1. H = High Voltage Level L = Low Voltage Level
Hi-Z = High Impedance
Description
Pericom Semiconductor's PI3B32X384 is a 3.3V, 20-bit bus switch
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. The
switches are turned ON by the Bus Enable (BE) input signal. Four
bus enable signals are provided, one for each of the upper and lower
five bits of the two 10-bit buses.
48-Pin
B
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PI3B32X384
3.3V, 20-Bit, 2-Port NanoSwitchTM
BE
B
BE
A
A
19
A
15
B
19
B
15
A
4
A
0
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4
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0
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D
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C
A
14
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10
B
14
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10
A
9
A
5
B
9
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5
B
A
OE
SW
SW
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SW
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PI3B32X384
3.3V, 20-Bit, 2-Port NanoSwitchTM
2
PS8336C 09/24/04
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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
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.
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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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1
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
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Capacitance
(T
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PI3B32X384
3.3V, 20-Bit, 2-Port NanoSwitchTM
3
PS8336C 09/24/04
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Notes:
1. For Max. or Min. conditons, 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
.
4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the
specified frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter
is not tested, but is guaranteed by design.
PI3B32X384 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.
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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 registered trademark of Nippon Motorola, Ltd
Power Supply Characteristics
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PI3B32X384
3.3V, 20-Bit, 2-Port NanoSwitchTM
4
PS8336C 09/24/04
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.014
.0157 BSC
0.40
0.356
.008 0.20
.002
.009
5
0.05
0.25
.079
2.0
.010 0.25
Gauge Plane
.150
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.80
4.00
.228
.244
5.80
6.20
.020
.029
0.50
0.75
.063
1.60
.015 0.381
.386
.394
9.80
10.00
.0051
.009
0.13
0.23
1
48
x 45
BSC
Nom
Max
Nom
REF
PackagingMechanical: 48-Pin BQSOP (B)
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
PI3B32X384B
B
48-pin BQSOP
PI3B32X384BE
B
Pb-free & Green, 48-pin BQSOP
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
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