1
PS8534 10/03/01
V
CC
NC
1
24
BE
A0
2
23
B0
A1
3
22
B1
A2
4
21
B2
A3
5
20
B3
A4
6
19
B4
A5
7
18
B5
A6
8
17
B6
A7
9
16
B7
A8
10
15
B8
A9
11
14
B9
GND
12
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Product Description
Pericom Semiconductors PI3VT series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI3VT3861, either a 2.5V or 3.3V 10-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 Description
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:
24-pin, 150 mil wide plastic QSOP (Q)
24-pin, 173 mil wide plastic TSSOP (L)
Applications
3.3V to 2.5V level shifting (voltage translation)
2.5V to 1.8V level shifting (voltage translation)
24-Pin
Q, L
PI3VT3861
10-Bit, 2-Port, Low Voltage
Translator Bus Switch
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A9
A0
B9
B0
BE
Truth Table
(1)
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
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PS8534 10/03/01
PI3VT3861
10-Bit, 2-Port, Low Voltage
Translator Bus Switch
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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 specifica-
tion is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reli-
ability.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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1
DC Electrical Characteristics
(Over Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
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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PI3VT3861
10-Bit, 2-Port, Low Voltage
Translator Bus Switch
3
PS8534 10/03/01
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min. Typ.
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
3
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3V
(3)
50
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
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
A
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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PS8534 10/03/01
PI3VT3861
10-Bit, 2-Port, Low Voltage
Translator Bus Switch
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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
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Ordering Information
24-pin QSOP package (Q)
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
typical
.007
.010
.228
.244
1
24
.150
.157
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.20
0.406
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.033
0.84
0.38
.015 x 45
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0-6
.008
.013
0.20
0.33
24-pin TSSOP package (L)
.303
.311
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
24
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
7.7
7.9
0.65
0.19
0.30
.007
.012
Max
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