PERICOM PI3VT3245QE

PI3VT3245
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Features
Description
•
•
•
•
•
Pericom Semiconductor’s PI3VT series of logic circuits are produced
using the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
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)
The PI3VT3245 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
A0
NC
1
20
VCC
A0
2
19
BE
A1
3
18
B0
A2
4
17
B1
A3
5
16
B2
A4
6
15
B3
A5
7
14
B4
A6
8
13
B5
A7
9
12
B6
GND
10
11
B7
B0
A7
B7
BE
Truth Table(1)
Function
BE
A0-7
Disconnect
H
Hi-Z
Connect
L
B0-7
Pin Description
Pin Name
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
1
Description
BE
Bus Enable Input (Active Low)
A0-A7
Bus A
B0-B7
Bus B
VCC
Power
GND
Ground
PS8530B
08/13/04
PI3VT3245
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Maximum Ratings
(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
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.
Power Dissipation ................................................................................ 0.5W
DC Electrical Characteristics (Over Operating Range, TA = –40°C to +85°C, VCC = 3.3V ±10%)
Description
Test Conditions(1)
VIH
Input HIGH Voltage
Guaranteed logic HIGH level
2.0
VCC +0.3V
VIL
Input LOW Voltage
Guaranteed logic LOW level
-0.5
0.8
IIH
Input HIGH Current
VCC = Max., VIN = VCC
±1
IIL
Input LOW Current
VCC = Max., VIN = GND
±1
IOZH
High Impedance Output
Current
0 ≤ A, B ≤ VCC
±1
Parameters
RON
Vp
Switch On-Resistance
Min.
Max.
VCC = Min, VIN = 0V, ION = -8mA
5
8
VCC = Min., VIN = 1.7V, ION = -8mA
15
22
VCC = 2.3V., VIN = 0V, ION = -8mA
6
9
VCC = 2.3V., VIN = 1.3V, ION = -8mA
25
30
2.5
2.9
VIN = VCC = 3.3V, IOUT = -5µA
Pass Voltage
Typ.(2)
2.3
VIN = VCC = 2.5V, IOUT = -5µA
Units
V
µA
Ω
V
1.8
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
CIN
Input Capacitance
COFF
A/B Capacitance, Switch Off
CON
A/B Capacitance, Switch On
Test Conditions
Typ.
Units
3.5
VIN = 0V
5.0
pF
11.2
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.
2
PS8530B
08/13/04
PI3VT3245
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Power Supply Characteristics
Parameters
Description
ICC
Quiescent Power Supply Current
∆ICC
Quiescent Current per Input HIGH
Test Conditions(1)
VCC = Max.
Min.
Typ.(2)
Max.
VIN = GND or VCC
VIN =
3
3V(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 VCC = 3.3V, +25°C ambient.
3. Per driven input (control input only); A and B pins do not contribute to ΔICC.
Switching Characteristics over 3.3V ±0.3V Operating Range
Parameters
Conditions(1)
Description
tPLH
tPHL
Propogation Delay(2,3) Ax to Bx
CL = 50pF,
RL = 500Ω
tPZH
tPZL
Enable Time BE to Ax or Bx
tPHZ
tPLZ
Disable Time BE to Ax or Bx
CL = 50pF,
RL = 500Ω,
R = 500Ω
Com.
Min.
Max.
Units
0.25
1.5
9.8
1.5
8.3
ns
Switching Characteristics over 2.5V ±0.2V Operating Range
Parameters
Conditions(1)
Description
tPLH
tPHL
Propogation Delay(2,3) Ax to Bx
CL = 50pF,
RL = 500Ω
tPZH
tPZL
Enable Time BE to Ax or Bx
tPHZ
tPLZ
Disable Time BE to Ax or Bx
CL = 50pF,
RL = 500Ω,
R = 500Ω
Com.
Min.
Max.
Units
0.25
1.5
9.8
1.5
8.3
ns
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.
3
PS8530B
08/13/04
PI3VT3245
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Packaging Mechanical: 20-pin QSOP (Q)
20
.008
0.20
MIN.
.150
.157
3.81
3.99
.008
.013
0.20
0.33
Guage Plane
.010
0.254
1
Detail A
.337 8.56
.344 8.74
0˚-6˚
.016
.035
0.41
0.89
.041
1.04
REF
.058 REF
1.47
.015 x 45˚
0.38
.053 1.35
.069 1.75
Detail A
.007
.010
SEATING
PLANE
.016
.050
.025
BSC
0.635
.004 0.101
.010 0.254
.008 0.203
.012 0.305
0.178
0.254
0.41
1.27
.228
.244
5.79
6.19
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
Packaging Mechanical: 20-pin TSSOP (L)
20
.169
.177
1
.252
.260
6.4
6.6
.0256
BSC
0.65
4.3
4.5
.004 0.09
.008 0.20
.047
1.20
Max
.007
.012
0.19
0.30
0.45
0.75
SEATING
PLANE
.018
.030
.238
.269
6.1
6.7
.002 0.05
.006 0.15
X.XX
X.XX
4
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
PS8530B
08/13/04
PI3VT3245
8-Bit, 2-Port, Low Voltage
Translator Bus Switch
Ordering Information
Ordering Code
PI3VT3245L
PI3VT3245LE
PI3VT3245Q
PI3VT3245QE
Packaging Code
L
L
Q
Q
Package Description
20-pin TSSOP
Pb-free & Green, 20-pin TSSOP
20-pin QSOP
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
5
PS8530B
08/13/04