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| 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI5C3257 QUAD 2:1 MUX/DEMUX BusSwitch PI5C3257 Quad 2:1 MUX/DEMUX BusSwitch Product Features: * Near zero propagation delay * 5 switches connect inputs to outputs * Direct bus connection when switches are ON * Ultra Low Quiescent Power (0.2A Typical) - Ideally suited for notebook applications * Pin compatible with 74 series 257 logic devices * Packages available: - 16-pin 150 mil wide plastic QSOP (Q) - 16-pin 300 mil wide plastic SOIC (S) - 16-pin 150 mil wide plastic SOIC (W) - 20-pin 150 mil wide plastic TSSOP (R) 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 PI5C3257 is a Quad 2:1 multiplexer/demultiplexer with threestate outputs that is pinout and function compatible with the PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be connected to outputs with low on resistance (5) with no additional ground bounce noise or propagation delay. Logic Block Diagram IA0 IA1 IB0 IB1 IC0 IC1 ID0 ID1 16-Pin Product Configuration S IA0 IA1 YA IB0 IB1 YB GND 16 1 15 2 14 3 16-PIN 13 4 12 5 11 6 10 7 9 8 VCC E ID0 ID1 YD IC0 IC1 YC E S 20-Pin Product Configuration NC S IA0 IA1 YA IB0 IB1 YB GND NC 20 1 19 2 18 3 4 20-PIN17 5 R20 16 15 6 14 7 13 8 12 9 11 10 NC VCC E ID0 ID1 YD IC0 IC1 YC NC YA YB YC YD Truth Table(1) E H L L S X L H YA Hi-Z IA0 IA1 YB Hi-Z IB0 IB1 YC Hi-Z IC0 IC1 YD Hi-Z ID0 ID1 Function Disable S=0 S=1 Product Pin Description Pin Name IAn-IDn S E YA-YD GND VCC NC Description Data Inputs Select Inputs Enable Data Outputs Ground Power No Connect Note: 1. H = High Voltage Level L = Low Voltage Level 158 PS7018A 03/13/96 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI5C3257 QUAD 2:1 MUX/DEMUX BusSwitch Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................................................. -55C to +125C 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 I, Y VCC VCC = Min., IIN = -18 mA I (Y) = 0V, Y (I) = 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 5 10 -1.2 Input Hysteresis at Control Pins Switch On Resistance (4) mV 7 15 Capacitance (TA = 25C, f = 1 MHz) Parameters(5) CIN COFF CON Description Input Capacitance In/Yn Capacitance, Switch Off In/Yn Capacitance, Switch On Test Conditions VIN = 0V VIN = 0V VIN = 0V Typ Max. 6 6 14 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 I and Y pin at indicated current through the switch. ON resistance is determined by the lower of the voltages on the two (I,Y) pins. 5. This parameter is determined by device characterization but is not production tested. 159 PS7018A 03/13/96 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI5C3257 QUAD 2:1 MUX/DEMUX BusSwitch 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) VCC = Max. VCC = Max. VCC = Max., I and Y Pins Open BE = GND Control Input Toggling 50% Duty Cycle Test Conditions(1) VIN = GND or VCC VIN = 3.4V(3) Min. Typ(2) 0.1 Max. 3.0 2.5 0.25 Units A mA mA/ MHz 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); I and Y 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 I and Y 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 PI5C3257 Com. (1) Parameters tIY tSY tPZH tPZL tPHZ tPLZ Description Propagation Delay(2,3) In to Yn BusSelectTime Sn to Yn BusDisableTime E to Yn BusDisableTime E to Yn Conditions CL = 50 pF RL = 500 Min Max Unit 0.25 0.5 0.5 0.5 5.2 4.8 5.0 ns ns ns ns Notes: 1. See test circuit and wave forms. 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 160 PS7018A 03/13/96 |
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