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PI3VT32X245
16-Bit, 2-Port, Low Voltage Translator Bus Switch
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)
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.
Applications
3.3V to 2.5V level shifting (voltage translation) 2.5V to 1.8V level shifting (voltage translation)
Logic Block Diagram
A0 B0
Product Pin Configuration
NC A0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VCC BE1 B0 B1 B2 B3 B4 B5 B6 B7 VCC BE2 B8 B9 B10 B11 B12 B13 B14 B15
40 39 38 37 36 35 34
A7 BE1 A8
B7
A1 A2 A3
B8
A4 A5
A15 BE2 A16
B15
A6 A7 GND
40-Pin B
33 32 31 30 29 28 27 26 25 24 23 22 21
B16
NC A8 A9
A23 BE3 A24
B23
A10 A11 A12
B24
A13 A14
A31 BE4
B31
A15 GND
1
PS8532
03/19/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3VT32X245 16-Bit, 2-Port, Low Voltage Translator Bus Switch
Product Pin Description
Pin Name BEN A0- A15 B0- B15 I/O I I/O I/O D e s cription Bus Enable Input (Active LO W) Bus A Bus B
Truth Table(1)
Function Disconnect Connect BEN H L A0-15 Hi- Z B0- 15
Maximum Ratings
Notes: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
(Above which the useful life may be impaired. For user guidelines, not tested.) Note: Storage Temperature .................................... 65C to +150C Stresses greater than those listed under MAXIMUM RATINGS Ambient Temperature with Power Applied .... 40C to +85C may cause permanent damage to the device. This is a stress rating Supply Voltage to Ground Potential ................... 0.5V to +4.6V only and functional operation of the device at these or any other DC Input Voltage ............................................. 0.5V to +5.5V conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating DC Output Current ...................................................... 120mA conditions for extended periods may affect reliability. Power Dissipation ........................................................... 0.5W
DC Electrical Characteristics (Over Operating Range, TA = 40C to +85C, VCC = 3.3V 10%)
Parame te rs VIH VIL IIH IIL IOZH De s cription Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Te s t Conditions (1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 A, B VCC VCC = Min., VIN = 0.0V, ION = 8mA RON Switch On Resistance VCC = Min., VIN = 1.7V, ION = 8mA VCC = 2.3V, VIN = 0.0V, ION = 8mA VCC = 2.3V, VIN = 1.3V, ION = 8mA VP Pass Voltage VIN = VCC = 3.3V, IOUT = 5A VIN = VCC = 2.5V, IOUT = 5A 2.3 5 10 6 25 2.5 1.8 M in. 1.8 0.5 Typ.(2) M ax. VCC +0.3V 0.8 1 1 1 8 22 9 30 2.9 V A Units V
2
PS8532
03/19/01
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PI3VT32X245 16-Bit, 2-Port, Low Voltage Translator Bus Switch
Capacitance (TA = 25C, f = 1 MHz)
Parame te rs (5) CIN C O FF CON Input Capacitance
De s cription
Te s t Conditions
Typ. 3.5
Units
A/B Capacitance, Switch Off A/B Capacitance, Switch On
VIN = 0V
5.0 10.0
pF
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 = 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.
Power Supply Characteristics
Parame te rs ICC ICC De s cription Quiescent Power Supply Current Quiescent Current per Input HIGH Te s t Conditions (1) VIN = GND or VCC VCC = Max. VIN
=
M in.
Typ.(2)
M ax. 6
Units
A 3V(3) 50
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, +25C ambient. 3. Per driven input (control input only); A and B pins do not contribute to ICC.
Switching Characteristics over 3.3V 0.3V Operating Range
Parame te rs tPLH tPHL tPZH tPZL tPHZ tPLZ De s cription Propagation Delay(2,3) Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Condition(1) CL = 50pF, RL = 500 ohms CL = 50pF, RL = 500 ohms R = 500 ohms 1.5 1.5 Com M in. M ax. 0.25 6.5 5.5 ns Units
3
PS8532
03/19/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3VT32X245 16-Bit, 2-Port, Low Voltage Translator Bus Switch
Switching Characteristics over 2.5V 0.2V Operating Range
Parame te rs tPLH tPHL tPZH tPZL tPHZ tPLZ D e s cription Propagation Delay(2,3) Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Condition(1) CL = 50pF, RL = 500 ohms CL = 50pF, RL = 500 ohms R = 500 ohms 1.5 1.5 Com M in. M ax. 0.25 9.8 8.3 Units 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.
40-pin BQSO Package (Q40)
X.XX X.XX
DENOTES DIMENSION IN MILLIMETERS
Notes: 1. Controlling dimensions in millimeters 2. Ref.: JEDEC MO - 154 BB
Ordering Information
Part PI3VT32X245B Pin-Package 40- BQSOP (B) Te mpe rature 40C to +85C
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
4
PS8532 03/19/01

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