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| IDTQS3257 HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX INDUSTRIAL TEMPERATURE RANGE QUICKSWITCH(R) PRODUCTS HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX FEATURES: * * * * * * * Enhanced N channel FET with no inherent diode to Vcc 5 bidirectional switches connect inputs to outputs Pin compatible with the 74F257, 74FCT257, and 74FCT257T Zero propagation delay, zero ground bounce Undershoot clamp diodes on all switch and control inputs TTL-compatible control inputs Available in SOIC, QSOP, and S1 packages IDTQS3257 DESCRIPTION: The QS3257 is a high-speed CMOS LVTTL-compatible Quad 2:1 multiplexer/demultiplexer. The QS3257 is a function and pinout compatible QuickSwitch version of the 74F257, 74FCT257, and the 74ALS/AS/LS257 Quad 2:1 multiplexers. The low ON resistance of the QS3257 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. Mux/Demux devices provide an order of magnitude faster speed than equivalent logic devices. The QS3257 is characterized for operation at -40C to +85C. APPLICATIONS: * * * * * Logic replacement Video, audio, graphics switching, muxing Hot-swapping, hot-docking Voltage translation (5V to 3.3V) Bus funneling FUNCTIONAL BLOCK DIAGRAM S E I0A YA I1A I0B YB I1B I0C YC I1C I0D YD I1D The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE 1 c 2001 Integrated Device Technology, Inc. FEBRUARY 2001 DSC-5756/6 IDTQS3257 HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX INDUSTRIAL TEMPERATURE RANGE PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS(1) Symbol VTERM(2) VTERM(3) Description Supply Voltage to Ground DC Switch Voltage Vs DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current Maximum Power Dissipation (TA = 85C) Storage Temperature Max -0.5 to +7 -0.5 to +7 -0.5 to +7 -3 120 0.5 -65 to +150 Unit V V V V mA W C S I0A I1A YA I0B I1B YB GND 1 2 3 4 5 6 7 8 SOIC/ QSOP/ S1 TOP VIEW 16 15 14 13 12 11 10 9 VCC E I0D I1D YD I0C I1C YC VTERM(3) VAC IOUT PMAX TSTG NOTE: 1. Stresses greater than those listed under ABSOLUTE 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. 2. Vcc terminals. 3. All terminals except Vcc. CAPACITANCE Pins Control Pins Quickswitch Channels (Switch OFF) (TA = +25C, f = 1.0MHZ, VIN = 0V, VOUT = 0V) Typ. 4 Demux Mux 5 8 Max. (1) 5 7 9 Unit pF pF NOTE: 1. This parameter is measured at characterization but not tested. PIN DESCRIPTION Pin Names Ixx S E YA - YD I/O I I I O Data Inputs Select Input Enable Input Data Outputs Description FUNCTION TABLE(1) Enable E H L L S X L H YA Hi-Z I0A I1A Outputs YB Hi-Z I0B I1B YC Hi-Z I0C I1C YD Hi-Z I0D I1D Function Disconnected Select 0 Select 1 NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High-Impedance 2 IDTQS3257 HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX INDUSTRIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 5% Symbol VIH VIL IIN IOZ RON VP Parameter Input HIGH Level Input LOW Level Off-State Output Current (Hi-Z) Switch ON Resistance Pass Voltage(2) Test Conditions Guaranteed Logic HIGH for Control Pins Guaranteed Logic LOW for Control Pins 0V VOUT VCC VCC = Min., VIN = 0V, ION = 30mA VCC = Min., VIN = 2.4V, ION =15mA VIN = VCC = 5V, IOUT = -5A Min. 2 -- -- -- -- -- 3.7 Typ.(1) -- -- -- -- 5 10 4 Max. -- 0.8 1 1 7 15 4.2 Unit V V A A V Input LeakageCurrent (Control Inputs)(2) 0V VIN VCC NOTES: 1. Typical values are at VCC = 5.0V, TA = 25C. 2. Pass Voltage is guaranteed but not production tested. TYPICAL ON RESISTANCE vs VIN AT VCC = 5V 16 RON (ohms) 14 12 10 8 6 4 2 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VIN (Volts) 3 IDTQS3257 HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol ICCQ ICC ICCD Parameter Quiescent Power Supply Current Power Supply Current per Control Input HIGH (2) Dynamic Power Supply Current per MHz(3) Test Conditions(1) VCC = Max., VIN = GND or Vcc, f = 0 VCC = Max., VIN = 3.4V, f = 0 VCC = Max., I and Y pins open Control Inputs Toggling at 50% Duty Cycle NOTES: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics. 2. Per TLL driven input (VIN = 3.4V, control inputs only). I and Y pins do not contribute to Icc. 3. This current applies to the control inputs only and represents 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 guaranteed but not production tested. Max. 3 1.5 0.25 Unit A mA mA/MHz SWITCHING CHARACTERISTICS OVER OPERATING RANGE TA = -40C to +85C, VCC = 5.0V 5%; CLOAD = 50pF, RLOAD = 500 unless otherwise noted. Symbol tPLH tPHL tPZH tPZL tPZH tPZL tPHZ tPLZ Data Propagation Delay (2,3) Ix to Y Switch Turn-on Delay Sx to Y Switch Turn-on Delay Ex to Y Switch Turn-off Delay (2) Ex to Y, Sx to Y 0.5 -- 5 ns Parameter Min. (1) -- 0.5 0.5 Typ. -- -- -- Max. 0.25(3) 5.2 4.8 Unit ns ns ns NOTES: 1. Minimums are guaranteed but not production tested. 2. This parameter is guaranteed but not production tested. 3. The bus switch contributes no propagation 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 CL = 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to the system. Propagation 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. 4 IDTQS3257 HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDTQS XXXXX Device Type XX Package SO Q S1 S1G 3257 Small Outline IC Quarter Size Outline Package Small Outline IC SOIC - Green High Speed CMOS Quickswitch Quad 2:1 Mux/Demux CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com for Tech Support: logichelp@idt.com (408) 654-6459 5 |
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