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PI3C3245
2.5V/3.3V, High Bandwidth, Hot Insertion 8-Bit, 2-Port, Bus Switch
Product Features
Near zero propagation delay 5 switches connect inputs to outputs High Bandwidth Operation (>400 MHz) Permits Hot Insertion 5V I/O Tolerant Rail-to-Rail 3.3V or 2.5V Switching 2.5V Supply Voltage Operation Packages available: 20-pin 150 mil wide plastic QSOP (Q) 20-pin 173 mil wide plastic TSSOP (L)
Product Description
Pericom Semiconductors PI3C series of logic circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI3C3245 is a 2.5V or 3.3V 8-bit, 2-port bus switch designed with a low ON resistance (5) 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. It is very useful in switching signals that have high bandwidth (>400 MHz).
Logic Block Diagram
Product Pin Configuration
NC A0 A1 A2 A3 A4 A5 A6 1 2 3 4 6 7 8 9 10
L,Q
)
*
20 19 18 17 15 14 13 12 11
VCC BE B0 B1 B2 B3 B4 B5 B6 B7
)%
*%
5 20-Pin 16
*-
A7 GND
Truth Table(1)
Function Disconnect Connect BE H L A07 Hi-Z B07
Product Pin Description
Pin Name BE A07 B07 GND VCC Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power
Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
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PS8162B
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PI3C3245 2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port, Bus Switch
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 (Inputs & VCC Only) ........ 0.5V to +4.6V Supply Voltage to Ground Potential (Outputs & D/O Only) ...... 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 specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
DC Electrical Characteristics (Over Operating Range, TA = -40C to +85C, VCC = 3.3V 10%)
Parameters Description VIH VIL IIH IIL IOZH VIK RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Clamp Diode Voltage Switch On Resistance
(4)
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND VCC = Min., IIN = -18mA VCC = Min., VIN = 0.0V, ION = 48mA VCC = Min., VIN = 2.4V, ION = 15mA
Min. 2.0 -0.5
Typ.(2)
Max. 0.8 1 1 1
Units V
A V
High Impedance Output Current 0 A, B VCC -0.73 -1.2 5 8
7 15
Capacitance (TA = 25C, f = 1 MHz)
Parameters(5) CIN COFF CON Description Input Capacitance A/B Capacitance, Switch Off A/B Capacitance, Switch On Test Conditions VIN = 0V VIN = 0V VIN = 0V Typ. 3.5 5.0 10.0 Units 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.
2
PS8162B
12/10/99
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PI3C3245 2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port, Bus Switch
Power Supply Characteristics
Parameters Description ICC ICC Quiescent Power Supply Current Supply Current per Input HIGH Test Conditions(1) VCC = Max. VCC = Max. VIN = GND or VCC VIN = 3.0V(3) Min. Typ.(2) 260 Max. 500 A 750 Units
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 Operating Range
PI3C3245 Com. Min. Max. 0.25 1.5 CL = 50pF, RL = 500, R = 500 1.5 6.5 5.5 ns
Parameters Description tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Delay(2,3)
Conditions(1) CL = 50pF, RL = 500
Units
Switching Characteristics over 2.5V Operating Range
PI3C3245 Com. Min. Max. 0.25 1.5 CL = 50pF, RL = 500, R = 500 1.5 9.8 8.3 ns
Parameters Description t PLH tPHL t PZH t PZL t PHZ tPLZ Propagation Delay(2,3) Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx
Conditions(1) CL = 50pF, RL = 500
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.
3
PS8162B
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VOUT, (V)
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PI3C3245 2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port, Bus Switch
4.0
VCC = 3.3V 3.1V 2.9V 2.7V 2.5V 2.3V
3.8V 3.6V 3.4V 3.2V 3.0V 2.8V
2.0
0.0 0.0
1.0
2.0 VIN, (V)
3.0
4.0
5.0
Output Voltage vs. Input Voltage over Various Supply Voltages Output Voltage vs. Input Voltageover Various Supply Voltages
Ordering Information
Part PI3C3245L PI3C3245Q Pin-Package 20- TSSOP (L) 20- QSOP (Q ) Te mpe rature 40C to +85C 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
PS8162B 12/10/99

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