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| 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI3B3251 3.3V, 8:1 Mux/Demux BusSwitch Product Features * Near zero propagation delay * 5 Ohm switches connect inputs to outputs * Ultra Low Quiescent Power (0.1A Typical) - Ideally suited for notebook applications * Pin compatible with 74 series 251 logic devices * Packages available: - 16-pin 150 mil wide plastic QSOP (Q) - 16-pin 150 mil wide plastic SOIC (W) - 16-pin 173 mil wide plastic TSSOP (L) Product Description Pericom Semiconductor's PI3B series of logic circuits are produced using the Company's advanced sub micron CMOS technology, achieving industry leading performance. The PI3B3251 is a 3.3V Dual 8:1 Multiplexer/demultiplexer with threestate outputs that is pinout compatible with the PI74FCT251T, 74F251, and 74ALS/AS/LS 251. Inputs can be connected to outputs with low on resistance (5 Ohm) with no additional ground bounce noise or propagation delay. Logic Block Diagram I0 I1 I2 I3 I4 I5 I6 I7 Product Pin Configuration 16 15 I3 I2 I1 I0 Y NC E GND 1 VCC I4 I5 I6 I7 S0 S1 S2 E S0 S1 S2 2 16-Pin 3 Q, W, L 14 13 4 12 5 11 6 10 7 9 8 Product Pin Description Y Pin Name I0-7 S0-2 E Y GND VCC Description Data Inputs Select Inputs Enable Data Outputs Ground Power Truth Table(1) E H L L L L L L L L S2 X L L L L H H H H Select S1 X L L H H L L H H S0 X L H L H L H L H Y Hi-Z I0 I1 I2 I3 I4 I5 I6 I7 Function Disable S2-0 = 0 S2-0 = 1 S2-0 = 2 S2-0 = 3 S2-0 = 4 S2-0 = 5 S2-0 = 6 S2-0 = 7 Note: 1. H = High Voltage Level L = Low Voltage Level 1 PS8150D 05/15/01 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI3B3251 3.3V, 8:1 Mux/Demux BusSwitch 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 +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%) 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(3) 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 or 64mA VCC = Min., VIN = 2.4V, ION = 15mA 5 10 Min. 2.0 -0.5 0.8 1 1 1 -1.2 8 17 Typ(2) Max. Units V V A A A V High Impedance Output Current 0 IN, YN VCC Capacitance (TA = 25C, f = 1 MHz) Parameters(5) CIN CI(OFF) CY(OFF) CI(ON) Description Input Capacitance I0 - I7 Capacitance, Switch Off Y Capacitance, Switch Off I0 - I7 Capacitance, Switch On Test Conditions VIN = 0V VIN = 0V VIN = 0V VIN = 0V Typ. 3.0 8.0 64.0 72.0 Units pF 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. 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. 4. This parameter is determined by device characterization but is not production tested. 2 PS8150D 05/15/01 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PI3B3251 3.3V, 8:1 Mux/Demux BusSwitch Power Supply Characteristics Parameters Description ICC ICC Quiescent Power Supply Current Supply Current per Input @ TTL HIGH VCC = Max. VCC = Max. Test Conditions(1) VIN = GND or VCC VIN = 3.0V(3) Min. Typ.(2) Max. 0.1 3 750 Units A A 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 TTL driven input (control input only); I and Y pins do not contribute to ICC. Switching Characteristics over Operating Range PI3B3251 Com. Min. Max. 0.25 1 1 1 4.5 ns CL = 50pF RL = 500 CL = 50pF RL = 500 3.5 5.5 Parameters Description tPD tSY tPZH tPZL tPHZ tPLZ Propagation Delay(2,3) In to Y Bus Enable Time Sn to Y Bus Enable Time E to Y Bus Disable Time E to Y Conditions(1) CL = 50pF RL = 500 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. Ordering Information Part Numbe r PI3B3251Q PI3B3251W PI3B3251L Pin / Package 16- QSOP (Q) 16- SOIC (W) 16- TSSOP (L) Te mpe rature -40C to +85C -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 3 PS8150D 05/15/01 |
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