1 PS8335A 10/05/00
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PI3B34X245
3.3V Hot Insertion
32-Bit, 2-Port Bus Switch
Product Features
Fast Switching Speed - 4.5ns max.
Permits Hot Insertion
Near-zero propagation delay
5 Ohm switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power (1.0µA typical)
 Ideally suited for notebook applications
Industrial operating temperature: 40°C to +85°C
Packages available:
 80-pin, 150-mil wide plastic BQSOP (B)
TTL - compatible control of input levels
Logic Block Diagram
Product Pin Configuration
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
in the companys advanced submicron CMOS technology.
The PI3B34X245 is a 3.3V, 32-bit, 2-port bus switch. Four enable
signals (BEn) turn the switches on. The bus switch creates no
additional propagational delay or additional ground bounce noise.
NC 1
2
3
4
5
6
7
8
9
GND 10
11
12
13
14
15
16
17
18
19
20
GND
BE1
80
79
78
77
76
75
V
CC
74
73
72
71
70
69
68
67
66
65
64
63
62 B
15
61
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
NC
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
B
14
B
13
B
12
B
11
B
10
B
9
B
8
BE2
V
CC
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
NC 21
22
23
24
25
26
27
28
29
GND 30
31
32
33
34
35
36
37
38
39
40
GND
BE3
60
59
58
57
56
55
V
CC
54
53
52
51
50
49
48
47
46
45
44
43
42 B
31
41
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
NC
A
24
A
25
A
26
A
27
A
28
A
29
A
30
A
31
B
30
B
29
B
28
B
27
B
26
B
25
B
24
BE4
V
CC
B
16
B
17
B
18
B
19
B
20
B
21
B
22
B
23
80-PIN
B
BE1
A7
A0
B7
B0
BE2
A15
A8
B15
B8
BE3
A23
A16
B23
B16
BE4
A31
A24
B31
B24
2
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PI3B34X245
3.3V Hot Insertion 32-Bit, 2-Port BusSwitch
PS8335A 10/05/00
Storage Temperature .............................................................. 65°C to +150°C
Ambient Temperature with Power Applied ............................. 40°C to +85°C
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
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.
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5) Description Test Conditions Typ. Units
CIN Input Capacitance VIN = 0V 3.5 pF
COFF A/B Capacitance, Switch Off VIN = 0V 8.0 pF
CON A/B Capacitance, Switch On VIN = 0V 16.0 pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 3.3V, TA = 25°C 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.
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DC Electrical Characteristics (Over the Operating Range, TA = 40°C to +85°C, VCC = 3.3V ± 10%)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Product Pin Description
Pin Name I/O Description
BEn I Bus Enable Input (Active LOW)
A0-A31 I/O Bus A
B0-B31 I/O Bus B
Function BEn A031
Disconnect H Hi-Z
Connect L B031
Truth Table(1)
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
3
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PI3B34X245
3.3V Hot Insertion 32-Bit, 2-Port BusSwitch
PS8335A 10/05/00
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 3.3V, +25°C ambient.
3. Per TTL driven input (control input only); A and B pins do not contribute to Icc.
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.
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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PI3B34X245
3.3V Hot Insertion 32-Bit, 2-Port BusSwitch
PS8335A 10/05/00
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131  1-800-435-2336 Fax (408) 435-1100  http://www.pericom.com
Packaging Mechanical: 80-pin BQSOP
3.80
4.00
0.254
.0197
0.50
5˚
Gauge Plane
.150
.157
X.XX
X.XX DENOTES DIMENSIONS
IN MILLIMETERS
.228
.244
5.80
6.20
.010
.063
.010
.016 0.254
0.406
0.803
0.811
20.40
20.60
.007
.010
0.17
0.27
40
80
x 45˚
41
1
.019
1.60
.002
.009
0.05
0.25
.078
2.0
5˚
.019
.029 0.50
0.75
.008 NOM
0.203
0.50
REF
BSC
Max
Nom
BSC
Ordering Information
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B542X43B3IPPOSQBcitsalpediwlim-051,nip-08