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Product Features
* Near zero propagation delay * 5 switches with 25 series resistor connect inputs to outputs * Direct bus connection when switches are ON * Ultra Low Quiescent Power (0.2A Typical) - Ideally suited for notebook applications * Packages available: - 24-pin 150 mil wide plastic QSOP (Q) - 24-pin 300 mil wide plastic SOIC (S)
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PI5C32861 10-Bit, 2-Port Bus Switch with 25 Series Resistor
PI5C32861
10-Bit, 2-Port Bus Switch with 25 Series Resistor
1 2 3 4 5 6
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced using the Companys advanced 0.8 micron CMOS technology, achieving industry leading performance. The PI5C32861 is a 10-bit, 2-port bus switch designed with a low ON resistance that permits 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. The PI5C32861 is designed with an internal 25 resistor that reduces noise reflection in highspeed applications
Logic Block Diagram
Product Pin Configuration
NC
A0
B0
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 GND
A9
B9
1 24 2 23 3 22 4 21 5 24-PIN 20 Q24 19 6 S24 18 7 8 17 9 16 10 15 11 14 12 13
VCC
BE B0 B1 B2 B3 B4 B5 B6 B7 B8 B9
7 8 9 10
Product Pin Description
BE
Truth Table(1)
Function Disconnect Connect Note: BE H L A0-9 Hi-Z B0-9
Pin Name BE A0-9 B0-9 GND VCC
Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power
11 12 13 14 15
1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C32861 10-Bit, 2-Port Bus Switch with 25 Series Resistor
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 +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) -0.5V to +7.0V DC Input Voltage ................................................................. -0.5V to +7.0V 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 = 5V 5%)
Parameters Description VIH VIL IIH IIL IOZH VIK IOS VH RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Short Circuit Current(3) Input Hysteresis at Control Pins Switch On Resistance
(4)
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 - A, B - VCC VCC = Min., IIN = -18mA A (B) = 0V, B (A) = VCC100
Min. 2.0 -0.5
Typ(2)
Max. 0.8 1 1 1
Units V V A A A V mA
-0.7
-1.2
150 VCC = Min., VIN = 0.0V, ION = 48mA VCC = Min., VIN = 2.4V, ION = 15mA 18 18 28 35 40 48
mV
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 Max. 6 6 8 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 = 5.0V, 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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PS8104 03/14/97
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PI5C32861 10-Bit, 2-Port Bus Switch with 25 Series Resistor
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., A and B Pins Open BE = GND Control Input Toggling 50% Duty Cycle VIN = GND or VCC VIN = 3.4V(3) Min. Typ(2) 0.1 Max. 10 2.5 0.25 Units A
1 2
mA mA/ MHz
3 4 5 6
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at Vcc = 5.0V, +25C ambient. 3. Per TTL driven input (VIN = 3.4V, 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.
Switching Characteristics over Operating Range
PI5C32861 Com.
7
Max Units
Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ
Description 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(1) CL = 50pF RL = 500
Min
8 9 10 11 12 13 14 15
1.25 1.5 1.5 6.5 5.5
ns ns 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 1.25ns 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.
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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PS8104 03/14/97

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