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| IDTQS32244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE QUICKSWITCH(R) PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH * * * * * * IDTQS32244 FEATURES: Enhanced N channel FET with no inherent diode to Vcc 25 bidirectional switches connect inputs to outputs Pin compatible with 74F244, 74FCT244, and 74FCT244T Zero propagation delay, zero ground bounce Undershoot clamp diodes on all switch and control inputs Available in QSOP and SOIC packages DESCRIPTION: APPLICATIONS: * * * * * * * Hot-swapping, hot-docking Voltage translation (5V to 3.3V) Power conservation Capacitance reduction and isolation Logic replacement (data processing) Clock gating Bus switching and isolation The QS32244 provides a set of eight high-speed CMOS TTL-compatible bus switches in a pinout compatible with 74FCT244, 74F244, 74ALS/AS/ LS244 8-bit drivers. The two enable (xG) signals turn the switches on similar to the xG signals of the 74'244. The QS32244 adds an internal 25 resistor to reduce reflection noise in high speed applications. When the switch is closed, it acts as the source termination for the driver connected to it. QuickSwitch devices provide an order of magnitude faster speed than conventional logic devices. The QS32244 is characterized for operation at -40C to +85C. FUNCTIONAL BLOCK DIAGRAM 1G 1A1 1A2 1A3 1A4 1Y1 1Y2 1Y3 1Y4 2G 2A1 2A2 2A3 2A4 2Y1 2Y2 2Y3 2Y4 The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE 1 c 1999 Integrated Device Technology, Inc. DECEMBER 1999 DSC-5721/1 IDTQS32244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS(1) Symbol VTERM(2) 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 1G 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND 1 2 3 4 5 6 7 8 9 1 0 QSOP/ SOIC TOP VIEW 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 VCC 2G 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 VTERM(3) VTERM(3) VAC IOUT PMAX TSTG NOTES: 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 (TA = +25C, f = 1MHz, VIN = 0V, VOUT = 0V) Pins Control Inputs Quickswitch Channels (Switch OFF) Typ. 3 5 Max. (1) 5 7 Unit pF pF NOTE: 1. This parameter is guaranteed but not production tested. PIN DESCRIPTION Pin Names 1G, 2G Ax, Yx Output Enable Data I/Os Description FUNCTION TABLE(1) 1G H L H L 2G H H L L 1A, 1Y I/Os Disconnected 1Ax = 1Yx Disconnected 1Ax = 1Yx 2A, 2Y I/Os Disconnected Disconnected 2Ax = 2Yx 2Ax = 2Yx NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level 2 IDTQS32244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5V 5% Symbol VIH VIL IIN IOZ RON VP Parameter Input HIGH Voltage Input LOW Voltage Input Leakage Current (Control Inputs) Off-State Current (Hi-Z) Switch ON Resistance(2) Pass Voltage(3) Test Conditions Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs 0V VIN VCC 0V VOUT VCC, Switches OFF VCC = Min., VIN = 0V, ION = 30mA VCC = Min., VIN = 2.4V, ION = 15mA VIN = VCC = 5V, IOUT = -5A Min. 2 -- -- -- 20 20 3.7 Typ.(1) Max. -- -- -- -- 28 35 4 -- 0.8 1 1 40 48 4.2 V Unit V V A A NOTES: 1. Typical values are at VCC = 5V and TA = 25C. 2. RON is guaranteed but not production tested. 3. Pass voltage is guaranteed but not production tested. TYPICAL ON RESISTANCE vs VIN AT VCC = 5V 80 RON (ohms) 70 60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VIN (Volts) 3 IDTQS32244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH 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., A and Y Pins Open, Control Inputs Toggling @ 50% Duty Cycle Max. 3 2.5 0.25 Unit A mA mA/MHz NOTES: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics. 2. Per TTL-driven input (VIN = 3.4V). A 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 A and Y inputs generate no significant AC or DC currents as they transition. This parameter is guaranteed but not production tested. SWITCHING CHARACTERISTICS OVER OPERATING RANGE TA = -40C to +85C, VCC = 5V 5% CLOAD = 50pF, RLOAD = 500 unless otherwise noted. Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ Parameter Data Propagation Delay(2) Ax to Yx Switch Turn-On Delay 1G, 2G to Yx Switch Turn-Off Delay(2) 1G, 2G to Yx 0.5 0.5 6.6 5.2 ns ns Min. (1) Typ. Max. 1.25(3) Unit 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 1.25ns at 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 IDTQS32244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDTQS XXXXX Device Type XX Package X Process Blank Industrial (-40C to +85C) Q SO Quarter Size Outline Package Small Outline IC 32244 High Speed CMOS Quickswitch 8-Bit Bus Switch 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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