1
PS8430B 11/18/02
BE
A
1
B
0
2
A
0
3
A
1
4
B
1
5
B
2
6
A
2
7
A
3
8
B
3
9
B
4
10
A
4
11
GND
12
BE
C
13
B
5
14
A
5
15
A
6
16
B
6
17
B
7
18
A
7
19
A
8
20
B
8
21
B
9
22
A
9
23
GND
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VCC
B
19
A
19
A
18
B
18
B
17
A
17
A
16
B
16
B
15
A
15
BE
B
VCC
B
14
A
14
A
13
B
13
B
12
A
12
A
11
B
11
B
10
A
10
BE
D
Product Description
Pericom Semiconductor's PI3C series of logic circuits are produced
using the Company's advanced submicron CMOS technology,
achieving industry performance.
The PI3C32X384, is a 2.5V or 3.3Volt, high-bandwidth 20-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.
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.
Product Pin Configuration
Product Pin Description
Pin Name
Description
BE
X
Bus Enable Inputs (Active LOW)
A
19
- A
0
Bus A
B
19
- B0
Bus B
GND
Ground
V
CC
Power
Product Features
Near-zero propagation delay
5 ohm switches connect inputs to outputs (PI3C32X384)
High Bandwidth (>400 MHz)
Permits Hot Insertion.
5V I/O Tolerant
2.5V Supply Voltage Operation
Packages available:
48-pin 150-mil wide plastic BQSOP (B)
Applications
High Bandwidth Data switching
Hot Docking
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Truth Table
(1)
Logic Block Diagram
PI3C32X384
2.5V/3.3V, High Bandwidth, Hot Insertion
20-Bit, 2-Port, Bus Switch
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Hi-Z = High Impedance
48-Pin
B
BE
B
BE
A
A
19
A
15
B
19
B
15
A
4
A
0
B
4
B
0
BE
D
BE
C
A
14
A
10
B
14
B
10
A
9
A
5
B
9
B
5
Function
BE
A
BE
B
B
0-B4
B
5-B9
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A
4-A0
Hi-Z
Connect
H
L
Hi-Z
A
19-A15
Connect
L
L
A
4-A0
A
19-A15
Function
BE
C
BE
D
B
9-B5
B
14-B10
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A
9-A5
Hi-Z
Connect
H
L
Hi-Z
A
14-A10
Connect
L
L
A
9-A5
A
14-A10
2
PS8430B 11/18/02
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PI3C32X384
2.5V/3.3V, High Bandwidth, Hot Insertion,
20-Bit, 2-Port Bus Switch
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 +5.5V
DC Output Current .............................................................................. 120mA
Power Dissipation ................................................................................. 0.5W
Note:
Stresses greater than those listed under MAXIMUM RAT-
INGS 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. Expo-
sure to absolute maximum rating conditions for extended
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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5
1
DC Electrical Characteristics
(Over Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
Capacitance
(T
A
= 25C f = 1 MHz)
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PS8430B 11/18/02
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PI3C32X384
2.5V/3.3V, High Bandwidth, Hot Insertion,
20-Bit, 2-Port Bus Switch
Switching Characteristics over 3.3V 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
.
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5
.
2
Power Supply Characteristics
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Switching Characteristics over 2.5V 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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PS8430B 11/18/02
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PI3C32X384
2.5V/3.3V, High Bandwidth, Hot Insertion,
20-Bit, 2-Port Bus Switch
4.0
2.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
V
OUT
, (V)
VIN, (V)
VCC =
3.3V
3.1V
2.9V
2.7V
2.5V
2.3V
3.6V
3.8V
3.4V
3.2V
3.0V
2.8V
Output Voltage vs. Input Voltage over Various Supply Voltages
5
PS8430B 11/18/02
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PI3C32X384
2.5V/3.3V, High Bandwidth, Hot Insertion,
20-Bit, 2-Port Bus Switch
t
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4
Ordering Information
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
Packaging Mechanical: 48-pin BQSOP (package code B)
.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
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