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| PI5C32245 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 8-Bit, 2-Port Bus Switch with 25 Series Resistor Product Features: * * * * * Near zero propagation delay 25 series resistor termination 5 switches connect inputs to outputs Direct bus connection when switches are ON Ultra Low Quiescent Power (0.2 A Typical) - Ideally suited for notebook applications * Pin compatible with 74 series 245 logic devices * Packages available: - 20-pin 150 mil wide plastic QSOP (Q) Product Description: Pericom Semiconductor's PI5C series of logic circuits are produced in the Company's advanced 0.8 micron CMOS technology, achieving industry leading performance. The PI5C32245 is a 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. Pinout is compatible with PI74FCT245T (Octal Bidirectional Transceiver). The device has a built-in 25 resistor to reduce noise resulting from reflections, thus eliminating the need for an external terminating resistor. Logic Block Diagram Product Pin Configuration A0 B0 NC A0 A1 A2 1 2 20 19 VCC BE B0 B1 B2 B3 B4 B5 B6 B7 3 18 4 20-PIN 17 5 6 7 8 9 10 Q A7 B7 A3 A4 A5 A6 A7 GND 16 15 14 13 12 11 BE Truth Table(1) Function Disconnect Connect BE H L A0-7 Hi-Z B0-7 Product Pin Description Pin Name BE A0-7 B0-7 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 149 PS8136 08/20/97 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI5C32245 8-BIT, 2-PORT BusSwitch 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 .......................................................................... 120 mA 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) 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 = -18 mA A (B) = 0V, B (A) = VCC VCC = Min., VIN = 0.0V, ION = 48 mA VCC = Min., VIN = 2.4V, ION = 15 mA Min. 2.0 -0.5 Typ(2) Max. 0.8 1 1 1 Units V V A A A V mA -0.7 100 150 28 35 -1.2 Input Hysteresis at Control Pins Switch On Resistance (4) mV 40 48 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. 150 PS8136 08/20/97 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI5C32245 8-BIT, 2-PORT BusSwitch 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. 3.0 2.5 0.25 Units A 1 2 mA mA/ MHz 3 4 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. 5 6 7 Switching Characteristics over Operating Range PI5C32245 Com. 8 Unit ns ns ns Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Description Propagation Delay Ax to Bx, Bx to Ax Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx (2,3) Conditions(1) CL = 50 pF RL = 500 Min. Max. 1.25 9 10 11 12 13 14 15 1.5 1.5 7.5 5.5 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 0.25 ns for 50 pF 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 151 PS8136 08/20/97 |
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