1
PS8424C 01/09/01
Product Description
Pericom Semiconductors PI3C series of Bus Switch circuits are
produced using the Companys advanced submicron CMOS
technology, achieving industry leading speed.
The PI3C16861 is configured as a 2.5V or 3.3 volt, hot insertion, 20-
bit, 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 switch is turned ON by the Bus Enable (BE) input
signal. The device is 5V I/O Tolerant.
This device is very useful in switching signals that have high
bandwidth (>400 MHz) requirements.
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Truth Table
(1)
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Pin Name
Description
BEx
Bus Enable Inputs (Active LOW)
A
19-A0
Bus A
B
19-B0
Bus B
Product Pin Description
Product Pin Configuration
PI3C16861
2.5V/3.3V, High Bandwidth, Hot Insertion,
20-Bit, 2-Port BusSwitch
Product Features
Near-zero propagation delay
5-Ohm switches connect inputs to outputs
High Bandwidth (>400 MHz)
Rail-to-Rail 3.3V or 2.5V switching
Permits Hot Insertion
High Bandwidth data switching
Hot Docking
2.5V Supply Voltage Operation
Packages available:
48-pin 240-mil wide plastic TSSOP (A)
48-pin 150-mil wide plastic BQSOP (B)
48-pin 300-mil wide plastic SSOP (V)
Logic Block Diagram
48 Pin
A, B, V
n
o
it
c
n
u
F
E
B
X
0
A
-
9
1
A
t
c
e
n
n
o
c
si
D
H
Z
-i
H
t
c
e
n
n
o
C
L
0
B
-
9
1
B
2
PS8424C 01/09/01
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PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
DC Electrical Characteristics
(Over 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
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
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
1
I
OZH
High Impedance Output Current 0
A, B
V
CC
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.73
1.2
V
R
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
5
7
V
CC
= Min, V
IN
= 2.4V, I
ON
= 15mA
8
15
Storage Temperature......................................................... 65C to +150C
Ambient Temperature with Power Applied ........................... 40C to +85C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ........ 0.5V to +4.6V
Supply Voltage to Ground Potential (Outputs & D/O Only) ..... 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
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 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. 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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
A
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=
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3
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B
/
A
0
.
0
1
Capacitance
(T
A
= 25C, f = 1 MHz)
3
PS8424C 01/09/01
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PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
1
6
8
6
1
C
3
I
P
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)
3
,
2
(
x
A
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x
B
,
x
B
o
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x
A
C
L
R
,
F
p
0
5
=
L
0
0
5
=
5
2
.
0
s
n
T
H
Z
P
T
L
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m
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el
b
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x
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5
.
1
5
.
6
T
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P
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b
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B
x
B
r
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x
A
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B
5
.
5
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 3.3V Operating Range
1
6
8
6
1
C
3
I
P
.
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,
2
(
x
A
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x
B
,
x
B
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t
x
A
C
L
R
,
F
p
0
5
=
L
0
0
5
=
5
2
.
0
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n
T
H
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P
T
L
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b
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x
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B
5
.
1
8
.
9
T
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P
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b
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B
x
B
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x
A
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t
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B
3
.
8
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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.
x
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=
V
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=
C
C
0
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2
0
5
8
A
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0
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3
=
)
3
(
5
.
2
Power Supply Characteristics
4
PS8424C 01/09/01
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PI3C16861
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
.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
Output Voltage vs. Input Voltage over Various Supply Voltages
48-Pin TSSOP (A) Package
t
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a
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c
a
P
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T
A
1
6
8
6
1
C
3
I
P
)
A
(
P
O
S
S
T
-
8
4
C
5
8
+
o
t
C
0
4
-
B
1
6
8
6
1
C
3
I
P
)
B
(
P
O
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Q
B
-
8
4
C
5
8
+
o
t
C
0
4
-
V
1
6
8
6
1
C
3
I
P
)
V
(
P
O
S
S
-
8
4
C
5
8
+
o
t
C
0
4
-
Ordering Information
5
PS8424C 01/09/01
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PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
48-Pin BQSOP (B) Package
.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
48-Pin SSOP (V) Package
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
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