1
PS8175E 09/23/04
NC
1
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
10
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
11
GND
12
NC
13
14
15
16
17
18
19
20
21
22
23
GND
24
VCC
48
BE1
47
B0
46
B1
45
B2
44
B3
43
B4
42
B5
41
B6
40
B7
39
B8
38
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
37
VCC
BE2
36
35
34
33
32
31
30
29
28
27
26
25
Description
Pericom Semiconductor's PI3B16861 is configured as a 3.3 volt, hot-
insertion, 20-bit, 2-port bus switch designed with a low On-Resistance
(5-ohms) allowing inputs to be connected directly to outputs. The
bus switch creates no additional propagational delay or additional
ground bounce noise. The switch is turned ON by the Bus Enable
(BEx) input signal.
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Truth Table
(1)
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Pin Description
Pin Configuration
PI3B16861
Features
Near-Zero propagation delay
5-ohms switches connect inputs to outputs
Fast Switching Speed - 5ns (max.)
Direct bus connection when switches are ON
32X384 function with flow through pinout make board
layout easier
V
CC
Operating Range: 3.0V to 3.6V
Industrial operating temperature: 40C to +85C
Packaging (Pb-free & Green available):
48-pin 240-mil wide plastic TSSOP (A)
48-pin 300-mil wide plastic SSOP (V)
48-pin 150-mil wide plastic BQSOP (B)
Block Diagram
48-Pin
A, B, V
3.3V, 20-Bit, 2-Port NanoSwitchTM
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BE1
A9
A0
B9
B0
BE2
A19
A10
B19
B10
B
A
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SW
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2
PS8175E 09/23/04
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PI3B16861
3.3V, 20-Bit, 2-Port NanoSwitchTM
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.0V to 3.6V)
Capacitance
(T
A
= 25C, f = 1 MHz)
Storage Temperature ...................................................... 65C to +150C
Ambient Temperature with Power Applied ...................... 40C to +85C
Supply Voltage Range ....................................................... 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 specifica-
tion is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
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.
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PS8175E 09/23/04
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PI3B16861
3.3V, 20-Bit, 2-Port NanoSwitchTM
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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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.
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.
Power Supply Characteristics
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PS8175E 09/23/04
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PI3B16861
3.3V, 20-Bit, 2-Port NanoSwitchTM
Packaging Mechanical: 48-pin 240 Mil-Wide Thin Plastic TSSOP (A)
Packaging Mechanical: 48-pin 300 Mil-Wide Plastic SSOP (V)
.236
.244
.488
.496
.002
.006
SEATING PLANE
.007
.010
.0197
BSC
.004
.008
.319
1
48
12.4
12.6
6.0
6.2
0.50
0.17
0.27
8.1
0.05
0.15
0.09
0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.018
.030
0.45
0.75
.047
1.20 Max
BSC
0.20
0.51
1.01
0.25
0.381
0.635
.008
.008
.016
0-8
0.20
0.40
.110 2.79
.010
Gauge Plane
.02
.04
.015
.025
x 45
.025 BSC
0.635
.291
.299
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
7.39
7.59
.395
.420
10.03
10.67
.620
.630
15.75
16.00
.008
.0135
0.20
0.34
1
48
Nom.
Max
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
5
PS8175E 09/23/04
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PI3B16861
3.3V, 20-Bit, 2-Port NanoSwitchTM
.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
Packaging Mechanical: 48-pin 150 Mil-Wide Plastic BQSOP (B)
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
PI3B16861A
A
48-pin TSSOP
PI3B16861AE
A
Pb-free & Green, 48-pin TSSOP
PI3B16861V
V
48-pin SSOP
PI3B16861VE
V
Pb-free & Green, 48-pin SSOP
PI3B16861B
B
48-pin BQSOP
PI3B16861BE
B
Pb-free & Green, 48-pin BQSOP
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