PI3VT3245-A
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Features
•
•
•
•
•
Near-Zero propagation delay
Low On-Resistance switches connect inputs to outputs
2.5V to 3.3V Supply voltage operation
2.5V or 1.8V switching
Packaging (Pb-free & Green available):
– 20-pin, 150-mil wide plastic QSOP (Q)
– 20-pin, 173-mil wide plastic TSSOP (L)
Description
Pericom Semiconductor’s PI3VT series of logic circuits are produced
using the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
The PI3VT3245-A is a 2.5V or 3.3V 8-bit, 2-port bus switch
designed with a low On-Resistance (5Ω). The switches are turned
ON or enabled by the Bus Enable (BE) 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.
Applications
• 3.3V to 2.5V level shifting (voltage translation)
• 2.5V to 1.8V level shifting (voltage translation)
Block Diagram
Pin Configuration
NC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
BE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
A
0
B
0
A
0
A
1
A
2
A
7
A
3
B
7
A
4
A
5
A
6
BE
A
7
GND
Truth Table
(1)
Function
Disconnect
Connect
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
BE
H
L
A0-7
Hi-Z
B0-7
Pin Description
Pin Name
BE
A
0
-A
7
B
0
-B
7
V
CC
GND
Bus A
Bus B
Power
Ground
Description
Bus Enable Input (Active Low)
12-0245
1
10/04/11
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Maximum Ratings
PI3VT3245-A
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ......................................................... –65°C to +150°C
Ambient Temperature with Power Applied ........................ –40°C to +85°C
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 sec-
tions of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
reliability.
DC Electrical Characteristics
(Over Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.3V ±10%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output
Current
Test Conditions
(1)
Min.
2.0
-0.5
Guaranteed logic HIGH level
Guaranteed logic LOW level
V
CC
= Max., V
IN
= V
CC
V
CC
= Max., V
IN
= GND
0 ≤ A, B ≤ V
CC
V
CC
= Min, V
IN
= 0V, I
ON
= -8mA
R
ON
Switch On-Resistance
V
CC
= Min., V
IN
= 1.7V, I
ON
= -8mA
V
CC
= 2.3V., V
IN
= 0V, I
ON
= -8mA
V
CC
= 2.3V., V
IN
= 1.3V, I
ON
= -8mA
Vp
Pass Voltage
V
IN
= V
CC
= 3.3V, I
OUT
= -5µA
V
IN
= V
CC
= 2.5V, I
OUT
= -5µA
2.1
5
18
6
35
2.3
1.6
Typ.
(2)
Max.
V
CC
+0.3V
0.8
±1
±1
±1
9
30
10
50
2.7
Units
V
µA
Ω
V
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(5)
Description
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
V
IN
= 0V
Test Conditions
Typ.
3.5
5.0
11.2
pF
Units
C
IN
C
OFF
C
ON
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
= 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.
12-0245
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10/04/11
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Power Supply Characteristics
Parameters
I
CC
∆I
CC
Description
Quiescent Power Supply Current
Quiescent Current per Input HIGH
PI3VT3245-A
Test Conditions
(1)
V
CC
= Max.
V
IN
= GND or V
CC
V
IN
= 3V
(3)
Min.
Typ.
(2)
Max.
3
50
Units
µA
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, +25°C ambient.
3. Per driven input (control input only); A and B pins do not contribute to ΔI
CC
.
Switching Characteristics over 3.3V ±0.3V Operating Range
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propogation Delay
(2,3)
Ax to Bx
Enable Time BE to Ax or Bx
Disable Time BE to Ax or Bx
Conditions
(1)
C
L
= 50pF,
R
L
= 500Ω
C
L
= 50pF,
R
L
= 500Ω,
R = 500Ω
1.5
1.5
Com.
Min.
Max.
0.25
9.8
8.3
ns
Units
Switching Characteristics over 2.5V ±0.2V Operating Range
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propogation Delay
(2,3)
Ax to Bx
Enable Time BE to Ax or Bx
Disable Time BE to Ax or Bx
Conditions
(1)
C
L
= 50pF,
R
L
= 500Ω
C
L
= 50pF,
R
L
= 500Ω,
R = 500Ω
1.5
1.5
Com.
Min.
Max.
0.25
9.8
8.3
ns
Units
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.
12-0245
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10/04/11
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Packaging Mechanical: 20-pin QSOP (Q)
DOCUMENT CONTROL NO.
PD - 1202
PI3VT3245-A
20
REVISION: H
.008
0.20
MIN.
DATE: 10/22/07
.008
.013
0.20
0.33
.150
.157
3.81
3.99
Guage Plane
1
.337
8.56
.344
8.74
.010
0.254
Detail A
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.058
REF
1.47
1
.053
1.35
.069
1.75
SEATING
PLANE
.015 x 45˚
0.38
Detail A
.007
.010
0.178
0.254
.025
BSC
0.635
.008
0.203
.012
0.305
.004
0.101
.010
0.254
.228
.244
5.79
6.19
X.XX
DENOTES DIMENSIONS
X.XX
IN MILLIMETERS
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335
• www.pericom.com
DESCRIPTION:
20-Pin, 150-Mil
Wide, QSOP
PACKAGE CODE: Q
Note:
1) Controlling dimensions in inches.
2) Ref:
JEDEC MO-137B/AD
3) Dimensions do not include mold flash, protrusions or gate burrs
12-0245
4
10/04/11
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Packaging Mechanical: 20-pin TSSOP (L)
PI3VT3245-A
DATE: 05/03/12
DESCRIPTION: 20-pin, 173mil Wide TSSOP
PACKAGE CODE: L
DOCUMENT CONTROL #: PD-1311
REVISION: F
Notes:
1. Refer JEDEC MO-153F/AC
2. Controlling dimensions in millimeters
3. Package outline exclusive of mold flash and metal burr
12-0373
Ordering Information
Ordering Code
PI3VT3245-ALE
PI3VT3245-AQE
Packaging Code
L
Q
Package Description
Pb-free & Green, 20-pin TSSOP
Pb-free & Green, 20-pin QSOP
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
12-0245
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10/04/11
