1
PS8532 03/19/01
VCC
NC
1
40
BE1
A0
2
39
B0
A1
3
38
B1
A2
4
37
B2
A3
5
36
B3
A4
6
35
B4
A5
7
34
B5
A6
8
33
B6
A7
9
32
B7
GND
10
31
VCC
A8
11
30
BE2
A9
12
29
B8
13
28
B9
A10
NC
14
27
B10
A11
15
26
B11
A12
16
25
B12
A13
17
24
B13
A14
18
23
B14
A15
19
22
B15
GND
20
21
40-Pin
B
BE1
A7
A0
B7
B0
BE2
A15
A8
B15
B8
BE3
A23
A16
B23
B16
BE4
A31
A24
B31
B24
Product Description
Pericom Semiconductors PI3VT series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI3VT32X245, is a 2.5V or 3.3V 8-bit, 2-port bus switch, is
designed with a low ON resistance (5 ohms). The switches are
turned ON or enabled by the Bus Enable (BEn) input signal.
Given a 3.3V supply and an input voltage of 3.3V, the switch
translates to an output voltage of 2.5V. Similarly, when operated
with a 2.5V supply and given 2.5V inputs, the device translates the
outputs to 1.8V.
Logic Block Diagram
Product Pin Configuration
Product Features
Near zero propagation delay
Low ON resistance switches connect inputs to outputs
2.5V Supply Voltage Operation
2.5V or 1.8V switching
Packages available:
40-pin, 150 mil wide plastic BQSOP (B)
Applications
3.3V to 2.5V level shifting (voltage translation)
2.5V to 1.8V level shifting (voltage translation)
PI3VT32X245
16-Bit, 2-Port, Low Voltage
Translator Bus Switch
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PI3VT32X245
16-Bit, 2-Port, Low Voltage
Translator Bus Switch
2
PS8532 03/19/01
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Storage Temperature .................................... 65C to +150C
Ambient Temperature with Power Applied ....40C to +85C
Supply Voltage to Ground Potential ................... 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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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DC Electrical Characteristics
(Over Operating Range, T
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CC
= 3.3V 10%)
Truth Table
(1)
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
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Product Pin Description
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PS8532 03/19/01
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PI3VT32X245
16-Bit, 2-Port, Low Voltage
Translator Bus Switch
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 driven input (control input only); A and B pins do not contribute to
I
CC
.
Switching Characteristics over 3.3V 0.3V Operating Range
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
= 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.
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Power Supply Characteristics
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PI3VT32X245
16-Bit, 2-Port, Low Voltage
Translator Bus Switch
4
PS8532 03/19/01
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Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
Ordering Information
40-pin BQSO Package (Q40)
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.
Switching Characteristics over 2.5V 0.2V Operating Range
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Notes:
1. Controlling dimensions in millimeters
2. Ref.: JEDEC MO - 154 BB
X.XX
X.XX DENOTES DIMENSION IN MILLIMETERS
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