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Block Diagram
A0
SW
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PI3B32X384
3.3V, 20-Bit, 2-Port NanoSwitchTM
Features
Near-Zero propagation delay 5-ohm switches connect inputs to outputs Direct bus connection when switches are ON Ultra-low quiescent power 32X384 (0.1A typical) - Ideally suited for notebook applications * Fast Switching Speed - 4.5ns max. * TTL - compatible control of input levels * Packaging (pb-free & Green available): - 48-pin 150-mil wide plastic BQSOP (B) * * * *
Description
Pericom Semiconductor's PI3B32X384 is a 3.3V, 20-bit bus switch designed with a low On-Resistance allowing inputs to be connected directly to outputs. The bus switch creates no additional propagational delay or additional ground bounce noise. The switches are turned ON by the Bus Enable (BE) input signal. Four bus enable signals are provided, one for each of the upper and lower five bits of the two 10-bit buses.
Pin Configuration
B0 A5
SW
B5
A4 A15
SW
B4 B15
A9 A10
SW
B9 B10
SW
SW
SW
A
B
A19
SW
B19
A14
SW
B14
OE
BEA BEB
BEC BED
Truth Table(1)
Function Disconnect Connect Connect Connect Function Disconnect Connect Connect Connect BEA H L H L BEC H L H L BEB H H L L BED H H L L B4-B0 Hi- Z A4- A0 Hi- Z A4- A0 B9-B5 Hi- Z A9- A5 Hi- Z A9- A5 B19-B15 Hi- Z Hi- Z A19- A15 A19- A15 B14-B10 Hi- Z Hi- Z A14- A10 A14- A10
BEA B0 A0 A1 B1 B2 A2 A3 B3 B4 A4 GND BEC B5 A5 A6 B6 B7 A7 A8 B8 B9 A9 GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48-Pin B
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
VCC B19 A19 A18 B18 B17 A17 A16 B16 B15 A15 BEB VCC B14 A14 A13 B13 B12 A12 A11 B11 B10 A10 BED
Pin Description
Pin Name BEx A19- A0 B19- B0 GND Vcc D e s cription Bus Enable Inputs (Active LO W) Bus A Bus B Ground Power
Note:
1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
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PI3B32X384 3.3V, 20-Bit, 2-Port NanoSwitchTM
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) 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 +4.6V 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.
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 3.3V 10%)
Parame te rs VIH VIL IIH IIL IOZH VIK RON De s cription Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Te s t Conditions (1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND M in. 2.0 -0.5 -- -- -- -- -- -- Typ(2) -- -- -- -- -- -- 5 10 M ax. -- 0.8 1 1 1 -1.2 8 17 Units V V A A A V Ohm
High- Impedance Output Current 0 A, B VCC Clamp Diode Voltage Switch ON Resistance(4) VCC = Min., IIN = -18mA VCC = Min., VIN = 0.0V ION = 15mA VCC = Min., VIN =2.4V ION = 15mA
Capacitance (TA = 25C, f = 1 MHz)
Parame te rs (5) CIN C O FF CON De s cription Input Capacitance A/B Capacitance, Switch Off A/B Capacitance, Switch On Te s t Conditions VIN = 0V VIN = 0V VIN = 0V Typ -- -- -- M ax. 3.0 8.0 16.0 Units pF pF 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.
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PI3B32X384 3.3V, 20-Bit, 2-Port NanoSwitchTM
Power Supply Characteristics
Parame te rs ICC ICC De s cription Quiescent Power Supply Current per Te s t Conditions (1) VCC = Max., VIN = GND or VCC VCC = Max., VIN = 3.0V(3) M in. - - Typ(2) 0.1 - M a x. 3.0 750 Units A A
Notes: 1. For Max. or Min. conditons, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at VCC = 3.3V, +25C ambient. 3. Per TTL driven input (control inputs only); A and B pins do not contribute to ICC. 4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.
PI3B32X384 Switching Characteristics over Operating Range
PI3B32x384 Com. Parame te rs tP LH tP HL tP ZH tP ZL tP HZ tP LZ De s cription Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Conditions (2,3) CL = 50pF, RL = 500 1.0 1.0 M in. M a x. 0.25 4.0 3.5 ns Units
CL = 50pF, RL = 500 R = 500
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.
Applications Information
Logic Inputs
The logic control inputs can be driven up to +3.6V regardless of the supply voltage. For example, given a +3.3V supply, IN may be driven low to 0V and high to 3.6V. Driving IN Rail-to-Rail(R) minimizes power consumption.
Power-Supply Sequencing and Hot Plug Information
Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC and GND before applying signals to input/ output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd
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09/24/04
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PI3B32X384 3.3V, 20-Bit, 2-Port NanoSwitchTM
PackagingMechanical: 48-Pin BQSOP (B)
48
.150 .157 3.80 4.00
.228 .244 5.80 6.20
Gauge Plane .010 0.25 BSC .386 .394 9.80 10.00 .020 .029 0.50 0.75
1
.015 0.381 x 45 .008 0.20 Nom Nom .063 1.60 .079 2.0 Max .002 0.05 .009 0.25
.014 0.356 REF
5 .0157 BSC 0.40 X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS .0051 .009 0.13 0.23
Ordering Information
Ordering Code PI3B32X384B PI3B32X384BE Package Code B B Package Type 48-pin BQSOP Pb-free & Green, 48-pin BQSOP
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
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