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| PI3B16248 3.3V, 24-Bit to 48-Bit Mux/DeMux NanoSwitchTM Features * * * * * * * * Near-Zero propagation delay RON is 5 typical at 3.3V Fast switching speed: 4.5ns (max.) VCC operating range: 3.0V to 3.6V 500 pulldown to the unconnected B port Industrial operating temperature: -40C to +85C Make-before-break action Packaging (Pb-free & Green): - 80-pin BQSOP (B) Description Pericom Semiconductor's PI3B16248 is a 3.3V, 24-bit to 48-bit Mux/DeMux Bus Switch designed with a low On-Resistance allowing inputs to be connected directly to outputs. Block Diagram A1 500 2B1 1B1 A13 500 1B13 2B13 SW A12 500 2B12 1B12 A24 500 1B24 A B S 2B24 S1 S2 Truth Table(1) Function A to 1B A to 2B S2/S1 L H A 1B 2B Note: 1. H = High Voltage Level, L = Low Voltage Level 1 PS8172E 09/10/04 PI3B16248 3.3V, 24-Bit to 48-Bit, Mux/DeMux NanoSwitchTM Application Circuit 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 1B1 2B1 Pin Configuration S1 A1 1B2 2B2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 128M DIMM 100 MHz A2 1B3 2B3 A3 GND 1B4 2B4 A4 1B5 2B5 72 128M DIMM 72 100 MHz A5 1B6 2B6 A6 1B7 2B7 CPU 128M DIMM 100 MHz A7 1B8 2B8 VCC A8 GND 1B9 2B9 72:144 Bus Switch 3 of 3B16248 A9 1B10 2B10 A10 1B11 2B11 Core Logic 128M DIMM 72 Bits 100 MHz A11 1B1 2B12 A12 1B13 2B13 (64 Bits Data, 8 Bits ECC) S2 A13 1B14 2B14 A14 1B15 2B15 Memory Switching Application A15 GND 1B16 2B16 A16 1B17 2B17 A17 1B18 2B18 A18 1B19 2B19 A19 1B20 2B20 VCC A20 GND 1B21 2B21 A21 B22 1 2B22 A22 1B23 2B23 A23 1B2 2B24 A24 2 PS8172E 09/10/04 PI3B16248 3.3V, 24-Bit to 48-Bit, Mux/DeMux NanoSwitchTM Maximum Ratings (Above which 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 Range......................................................... -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 = 3.0 to 3.6V) Parameters VIH VIL IIH IIL RON CIN CON ICC IOZH VIK Description Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Switch On-Resistance Input Capacitance Output Capacitance Power Supple Quiescent High Impedance Output Current Clamp Diode Voltage S1, S2 S1, S2 VCC = MAX., VIN = VCC VCC - MAX., VIN = GND VCC = Min., VIN = 0V, ION = 24mA VCC = Min., VIN = 0V, ION = 12mA VCC = 0V, 25C, f = 1 MHz VCC = 0V, 25C, f = 1 MHz VCC = Max., VIN = GND or VCC 0 A, B VCC VCC = Min., IIN = -18mA 5 Test Conditions(1) Min. 2.0 -0.5 Typ.(2) Max. 0.8 1 1 8 15 3.0 25.0 20 1 Units V A pF A V 10 -0.7 -1.2 Note: 1. Typical values are shown at VCC = 3.3V, +25C ambient and maximum loading. Electrical Characteristics (VCC = 3.0V to 3.6V, TA = -40C to +85C) Parameters tPLH tEN tM tDIS (3) (3) Description Propagation Delay AX to BX Bus Enable Bus Disable Make-before-break time Test Conditions CL = 50pF, RL = 500 CL = 50pF RL = 500 R = 500 Com. Min. 1 1 0 Max. 250 4.5 5.0 2 Units ps ns Notes: 1. This parameter is guaranteed but not tested on Propagation Delays. 2. 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. See test circuit and waveforms. 3 PS8172E 09/10/04 PI3B16248 3.3V, 24-Bit to 48-Bit, Mux/DeMux NanoSwitchTM Applications Information Logic Inputs Logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a 5.0V supply, the control or select pins may be driven low to 0V and high to 5.5V. Driving the control or select pins Rail-toRail(R) minimizes power consumption. Power-Supply Sequencing and Hot Plug Information Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC and GND before applying signals to the input/output or control pins. Packaging Mechanical: 80-pin BQSOP (B) 80 41 .150 .157 3.80 4.00 .228 .244 5.80 6.20 .008 NOM 0.203 Gauge Plane 5 1 0.803 0.811 20.40 20.60 .063 1.60 Nom 40 .019 0.50 .029 0.75 .010 0.254 BSC 0.50 .019 REF .010 .016 0.254 x 45 0.406 .078 2.0 Max 5 .0197 BSC 0.50 .007 .010 0.17 0.27 .002 .009 0.05 0.25 X.XX X.XX DENOTES DIMENSIONS IN MILLIMETERS Ordering Information Ordering Code PI3B16248B PI3B16248BE Package Code B B 80-pin BQSOP Pb-free & Green, 80-pin BQSOP Package Description Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com 4 PS8172E 09/10/04 |
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