1
PS8357D 05 /10/01
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Truth Table
(1)
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Product Pin Description
Product Pin Configuration
PI5C16861C
PI5C162861C (25
)
20-Bit, 2-Port Bus Switch
Product Features
Near-zero propagation delay
5-ohm
or
25-
ohm
switches connect inputs to outputs
Direct bus connection when switches are ON
32X384 function with flow through pinout
make board layout easier
Ultra-low quiescent power (105A typical)
ideally suited for notebook applications
Industrial operating temperature: 40C to +85C
Packages available:
48-pin 240-mil wide plastic TSSOP (A)
Product Description
Pericom Semiconductors PI5C series of Bus Switch circuits are
produced using the Companys advanced submicron CMOS
technology, achieving industry leading speed.
The PI5C16861C is configured as a 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 switches
are turned ON by the Bus Enable (BEx) input signal.
The PI5C162861C device has a built-in 25-ohm series resistor to
reduce noise resulting from reflections, thus eliminating the need
for an external terminating resistor.
Logic Block Diagram
BE
1
A
9
A
0
B
9
B
0
BE
2
A
19
A
10
B
19
B
10
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
GND
NC
A
10
A
11
A
12
A
13
A
14
A
15
A
16
A
17
A
18
A
19
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VCC
BE
1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
VCC
BE
2
B
10
B
11
B
12
B
13
B
14
B
15
B
16
B
17
B
18
B
19
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
48-Pin
A
n
o
it
c
n
u
F
E
B
n
7
-
0
A
n
t
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e
n
n
o
c
si
D
H
Z
-i
H
t
c
e
n
n
o
C
L
7
-
0
B
n
e
m
a
N
n
i
P
O
/
I
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o
it
p
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r
c
s
e
D
2
S
-
0
S
I
st
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p
n
I
t
c
el
e
S
x
A
x
O
/I
A
s
u
B
x
B
x
O
/I
B
s
u
B
PI5C16861C
PI5C162861C
20-Bit, 2-Port Bus Switch
2
PS8357D 05 /10/01
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DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 10%)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional opera-
tion 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.
Capacitance
(T
A
= 25C, f = 1 MHz)
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
= 5.0V, 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.
Storage Temperature ...............................................................65C to +150C
Ambient Temperature with Power Applied .............................. 40C to +85C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ......... 0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ......0.5V to +7.0V
DC Input Voltage .......................................................................0.5V to +7.0V
DC Output Current .................................................................................120mA
Power Dissipation .................................................................................... 0.5W
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3
PS8357D 05 /10/01
PI5C16861C
PI5C162861C
20-Bit, 2-Port Bus Switch
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Power Supply Characteristics
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
= 5.0V, +25C ambient.
3. Per TTL driven input (V
IN
= 3.4V, 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.
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.
PI5C16861 Switching Characteristics over Operating Range
PI5C162861 Switching Characteristics over Operating Range
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PI5C16861C
PI5C162861C
20-Bit, 2-Port Bus Switch
4
PS8357D 05 /10/01
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Applications Information
Logic Inputs
Logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a 5.0V supply, the control or
select pins may be driven low to 0V and high to 5.5V. Driving the control or select pins Rail-toRail minimizes power consumption.
R
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V
CC
before applying signals to the input/
output or control pins.
t
r
a
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a
k
c
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C
0
4
Ordering Information
.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
48 -TSSOP (L) Package
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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