Page 1
PI3C34X245
2.5V/3.3V, High Bandwidth, Hot Insertion
32-Bit, 2-Port, Bus Switch
Product Features
Near zero propagation delay
5Ω switches connect inputs to outputs
2.5V Supply Voltage Operation
Permits Hot Insertion
5V I/O Tolerant
High Bandwidth Operation (>400 MHz)
Packages available:
80-pin 150 mil wide plastic BQSOP (B)
Logic Block Diagram
A0
A7
BE1
A8
A15
BE2
A16
A23
BE3
A24
B16
B23
B24
B0
B7
B8
B15
Product Description
Pericom Semiconductors PI3C series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI3C34X245 is a 2.5V or 3.3V, 32-bit, 2-port bus switch designed
with a low ON resistance (5Ω) 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. It is very useful in switching
signals that have high bandwidth (>400 MHz).
Product Pin Configuration
V
CC
80-Pin
B
80
BE1
79
B
0
78
B
1
77
B
2
76
B
3
75
B
4
74
B
5
73
B
6
72
B
7
71
V
CC
70
BE2
69
B
8
68
B
9
67
66
B
10
B
11
65
B
12
64
B
13
63
B
14
62
B
15
61
V
CC
60
BE3
59
B
16
58
B
17
57
B
18
56
B
19
55
B
20
54
B
21
53
B
22
52
B
23
51
V
CC
50
BE4
49
B
24
48
B
25
47
46
B
26
B
27
45
B
28
44
B
29
43
B
30
42
B
31
41
NC 1
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND 10
NC
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
GND
NC 21
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
GND 30
NC
A
24
A
25
A
26
A
27
A
28
A
29
A
30
A
31
GND
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
22
23
24
25
26
27
28
29
31
32
33
34
35
36
37
38
39
40
A31
BE4
B31
Product Pin Description
Pin Name Description
BEn Bus Enable Input (Active LOW)
A0 A31 Bus A
B0 B31 Bus B
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PS8429B 12/10/99
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
PI3C34X245
2.5V/3.3V, High Bandwidth,
Hot Insertion, 32-Bit, 2-Port, Bus Switch
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 +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
DC Electrical Characteristics (Over Operating Range, T
Parameters Description Test Conditions
V
V
I
IH
I
IL
I
OZH
V
R
IH
IL
IK
ON
Input HIGH Voltage Guaranteed Logic HIGH Level 2.0
Input LOW Voltage Guaranteed Logic LOW Level –0.5 0.8
Input HIGH Current VCC = Max., VIN = V
Input LOW Current VCC = Max., VIN = GND ±1 µA
High Impedance Output Current 0 ≤ A, B ≤ V
Clamp Diode Voltage VCC = Min., IIN = –18m A –0.73 –1.2 V
Switch On Resistance
(3)
VCC = Min., VIN = 0.0V, ION = 48mA 5 7 Ω
= –40°C to +85°C, VCC = 3.3V ±10%)
A
(1)
CC
VCC = Min., VIN = 2.4V, ION = 15mA 8 15
CC
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.
Min. Typ.
(2)
Max. Units
V
±1
±1
Capacitance (T
Parameters
C
IN
C
OFF
C
ON
(4)
= 25°C, f = 1 MHz)
A
Description Test Conditions Typ. Un i t s
Input Capacitance VIN = 0V 3.5
A/B Capacitance, Switch Off VIN = 0V 5.0 pF
A/B Capacitance, Switch On VIN = 0 V 10.0
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. 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.
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PS8429B 12/10/99
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Power Supply Characteristics
Parameters Description Test Conditions
(1)
PI3C34X245
2.5V/3.3V, High Bandwidth,
Hot Insertion, 32-Bit, 2-Port, Bus Switch
Min. Typ.
(2)
Max. Units
I
CC
Quiescent Power VCC = Max. VIN = GND or V
CC
1.0 2.0
Supply Current
∆I
CC
Supply Current per VCC = Max. VIN = 3.0V
(3)
Input HIGH
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
3. Per driven input (control input only); A and B pins do not contribute to ∆I
= 3.3V, +25°C ambient.
CC
CC
.
Switching Characteristics over 3.3V Operating Range
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Switching Characteristics over 2.5V Operating Range
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5.13.8
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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 timesof 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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3
PS8429B 12/10/99
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PI3C34X245
2.5V/3.3V, High Bandwidth,
Hot Insertion, 32-Bit, 2-Port, Bus Switch
, (V)
2.0
OUT
V
4.0
0.0
VCC = 3.3V
0.0
1.0 2.0
3.0 4.0 5.0
VIN, (V)
Output Voltage vs. Input Voltage over Various Supply Voltages
3.1V
2.9V
2.7V
2.5V
2.3V
3.8V
3.6V
3.4V
3.2V
3.0V
2.8V
Ordering Information
traPegakcaP-niPsnoisnemiD
B542X43C3IP)B(POSQB-08C°58+otC°04
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS8429B 12/10/99
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