1
PS8180A 08/21/01
1
2
3
4
5
6
7
3A1
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
1A1
1A2
S0
GND
2A1
2A2
VCC
3A2
4A1
4A2
5A1
5A2
6A2
GND
6A1
7A1
7A2
2B2
S2
1B1
S1
GND
3B2
1B2
2B1
3B1
4B1
4B2
5B1
5B2
6B2
6B1
7B1
7B2
8A1
8A2
9A1
9A2
10A2
11A2
10A1
11A1
12A1
12A2
GND
8B1
8B2
9B1
9B2
10B2
11B2
10B1
11B1
12B1
12B2
32
31
30
29
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PI3B16212
PI3B162212 (25 Ohms)
3.3V, 24-Bit Bus Exchange Switch
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
using the Companys advanced submicron CMOS technology.
The PI3B16212 and PI3B162212 are 3.3 volt, 24-bit bus exchange
switches designed with low ON resistance allowing inputs to be
connected directly to outputs. The devices operate as a 24-bit bus
switch or as a 12-bit exchanger, providing data exchange between
the four signal ports via the data select pins (S0-S2).
The PI3B162212 device has a built-in 25-ohm series resistor to
reduce reflection noise, thus eliminating the need for an external
terminating resistor.
Product Features
Near-zero propagation delay
5-ohm switches connect inputs to outputs
Direct bus connection when switches are ON
Fast Switching Speed: 5ns (max.)
V
CC
Operating Range: 3.0V to 3.6V
Industrial operating temperature: 40C to +85C
Packages available:
56-pin 240-mil wide thin plastic TSSOP (A)
56-pin 300-mil wide plastic SSOP (V)
Product Pin Configuration
56-Pin
A, V
1A1
1B1
1A2
1B2
FLOW CONTROL
ONE OF TWELVE CHANNELS
S0
S1
S2
Logic Block Diagram
Product Pin Description
Note:
1. H = High Voltage Level
L = Low Voltage Level
Z = High Impedance
Truth Table
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2
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1
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1
A
2
A
t
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D
L
L
L
Z
Z
1
B
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1
A
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H
1
B
Z
2
B
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1
A
L
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2
B
Z
1
B
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2
A
L
H
H
Z
1
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2
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2
A
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2
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H
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Z
Z
2
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2
A
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1
B
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1
A
H
H
L
1
B
2
B
1
B
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2
A
,
2
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1
A
H
H
H
2
B
1
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B
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B
2
PS8180A 08/21/01
PI3B16212
PI3B162212
3.3V, 24-Bit Bus-Exchange Switch
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DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.0V to 3.6V)
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 specification
is not implied. Exposure to absolute maximum rating con-
ditions 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.
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 useful life may be impaired. For user guidelines, not tested.)
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PI3B16212
PI3B162212
3.3V, 24-Bit Bus-Exchange Switch
3
PS8180A 08/21/01
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Power Supply Characteristics
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for applicable device.
2. Typical values are at V
CC
= 3.3V, +25C ambient.
3. This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
4. Per TTL driven input (control inputs only); A and B pins do not contribute to I
CC
.
5. 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.
PI3B16212 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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PS8180A 08/21/01
PI3B16212
PI3B162212
3.3V, 24-Bit Bus-Exchange Switch
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
56-Pin TSSOP (A) Package
56-Pin SSOP (V) Package
0.25
0.20
.025 BSC
0.635
.008
.008
.016
0-8
0.20
0.40
.110 2.79
.010
Gauge Plane
.291
.299
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
7.39
7.59
.396
.416
10.06
10.56
.02
.04
0.51
1.01
.015
.025
0.381
0.635
.720
.730
18.29
18.54
.008
.0135
0.20
0.34
1
56
x 45
Nom.
Max
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Ordering Information
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