IDTQS3244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE QUICKSWITCH® PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH FEATURES: • • • • • • DESCRIPTION: Enhanced N channel FET with no inherent diode to Vcc Ω bidirectional switches connect inputs to outputs 25Ω 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, SOIC, and TSSOP packages The QS3244 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 low ON resistance (5Ω) of the 3244 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. The two enable (xG) signals turn the switches on similar to the xG signals of the 74’244. QuickSwitch devices provide an order of magnitude faster speed than conventional logic devices. The QS3244 is characterized for operation at -40°C to +85°C. APPLICATIONS: • • • • • • • IDTQS3244 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 FUNCTIONAL BLOCK DIAGRAM 1G 2G 1A 1 1Y 1 2A 1 2Y 1 1A 2 1Y 2 2A 2 2Y 2 1A 3 1Y 3 2A 3 2Y 3 1A 4 1Y 4 2A 4 2Y 4 The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE DECEMBER 1999 1 c 1999 Integrated Device Technology, Inc. DSC-5722/3 IDTQS3244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION 1G 1 20 VCC 1A 1 2 19 2G 2Y 4 3 18 1Y 1 1A 2 4 17 2A 4 2Y 3 5 16 1Y 2 1A 3 6 15 2A 3 2Y 2 7 14 1Y 3 1A 4 8 13 2A 2 2Y 1 9 12 1Y 4 G ND 10 11 2A 1 Symbol Description VTERM(2) Max Unit VTERM(3) Supply Voltage to Ground –0.5 to +7 V DC Switch Voltage Vs –0.5 to +7 V VTERM(3) DC Input Voltage VIN –0.5 to +7 V VAC AC Input Voltage (pulse width ≤20ns) –3 V IOUT DC Output Current 120 mA PMAX Maximum Power Dissipation (TA = 85°C) TSTG Storage Temperature 0.5 W –65 to +150 °C 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 = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V) Pins QSOP/ SOIC/ TSSOP TOP VIEW Typ. Max. (1) Unit Control Inputs 3 5 pF Quickswitch Channels (Switch OFF) 5 7 pF NOTE: 1. This parameter is guaranteed but not production tested. PIN DESCRIPTION Pin Names Description 1G, 2G Output Enable Ax, Yx Data I/Os FUNCTION TABLE(1) 1G 2G 1A, 1Y I/Os 2A, 2Y I/Os H H Disconnected Disconnected L H 1Ax = 1Yx Disconnected H L Disconnected 2Ax = 2Yx L L 1Ax = 1Yx 2Ax = 2Yx NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level 2 IDTQS3244 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 = –40°C to +85°C, VCC = 5V ± 5% Symbol Parameter VIH Input HIGH Voltage VIL IIN Test Conditions Min. Typ.(1) Max. Unit Guaranteed Logic HIGH for Control Inputs 2 — — V Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC — — ±1 µA IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF — — ±1 µA RON Switch ON Resistance VCC = Min., VIN = 0V, ION = 30mA — 5 7 Ω VCC = Min., VIN = 2.4V, ION = 15mA — 10 12 VP Pass Voltage(2) VIN = VCC = 5V, IOUT = -5µA 3.7 4 4.2 NOTES: 1. Typical values are at VCC = 5V and TA = 25°C. 2. Pass voltage is guaranteed but not production tested. TYPICAL ON RESISTANCE vs VIN AT VCC = 5V 16 R ON (ohms) 14 12 10 8 6 4 2 0 0.0 0.5 1.0 1.5 2.0 VIN (Volts) 3 2.5 3.0 3.5 V IDTQS3244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol Test Conditions(1) Parameter Max. Unit ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 3 µA ∆ICC Power Supply Current per Control Input HIGH(2) VCC = Max., VIN = 3.4V, f = 0 2.5 mA ICCD Dynamic Power Supply Current per MHz(3) VCC = Max., A and Y Pins Open, Control Inputs Toggling @ 50% Duty Cycle 0.25 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, control inputs only). 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 = -40°C to +85°C, VCC = 5V ± 5% CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted. Symbol Min. (1) Parameter Typ. Max. Unit 0.25(3) ns tPLH tPHL Data Propagation Delay(2) tPZL tPZH Switch Turn-On Delay 1G, 2G to Yx 0.5 5.6 ns tPLZ Switch Turn-Off Delay(2) 0.5 5.2 ns tPHZ 1G, 2G to Yx Ax to Yx 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 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 IDTQS3244 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDTQS XXXXX Device Type XX Package CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 Q SO PA PAG Quarter Size Outline Package Small Outline IC Thin Shrink Small Outline Package TSSOP - Green 3244 High Speed CMOS Quickswitch 8-Bit Bus Switch for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 5 for Tech Support: [email protected] (408) 654-6459