IDTQS3245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE QUICKSWITCH® PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH DESCRIPTION: FEATURES: − − − − − − − − Enhanced N channel FET with no inherent diode to Vcc 5Ω bidirectional switches connect inputs to outputs Pin compatible with the 74F245, 74FCT245, and 74FCT245T Low power CMOS proprietary technology Zero propagation delay, zero ground bounce Undershoot clamp diodes on all switch and control inputs TTL-compatible control inputs Available in TSSOP, SOIC, and QSOP Packages The QS3245 provides a set of eight high-speed CMOS TTL-compatible bus switches in a pinout compatible with 74FCT245, 74F245, 74ALS/AS/ LS245 8-bit transceivers. The low ON resistance of the QS3245 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. The Output Enable (OE) signal turns the switches on similar to the OE signal of the 74’245. QuickSwitch devices provide an order of magnitude faster speed than conventional logic devices. The QS3245 is characterized for operation at -40°C to +85°C. APPLICATIONS − − − − − − − IDTQS3245 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 A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 OE INDUSTRIAL TEMPERATURE RANGE APRIL 2000 1 c 1999 Integrated Device Technology, Inc. DSC-5753/- IDTQS3245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Symbol NC A0 1 20 VCC 2 19 OE A1 3 18 B0 A2 4 17 B1 A3 B2 A5 5 S O 2 0-2 16 S O 2 0-8 6 S O 2 0-9 15 14 7 A6 8 13 B5 A7 9 12 B6 GND 10 11 B7 A4 (1) VTERM(2) Description Supply Voltage to Ground Max. – 0.5 to +7 Unit V VTERM(3) DC Switch Voltage VS – 0.5 to +7 V VTERM(3) VAC DC Input Voltage VIN – 0.5 to +7 V -3 V IOUT DC Output Current 120 mA PMAX Maximum Power Dissipation (TA = 85°C) 0.5 W TSTG Storage Temperature – 65 to +150 °C AC Input Voltage (pulse width ≤20ns) 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. B3 B4 CAPACITANCE (TA = +25OC, f = 1.0MHz, VIN = 0V, VOUT = 0V) SOIC/ QSOP/ TSSOP TOP VIEW Pins Control Pins Typ. 3 Max. (1) 5 Unit pF Quickswitch Channels (Switch OFF) 5 7 pF NOTE: 1. This parameter is guaranteed but not production tested. PIN DESCRIPTION Pin Names OE Description Output Enable An Data I/Os Bn Data I/Os FUNCTION TABLE(1) OE Outputs H Disconnected L An = Bn NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level 2 IDTQS3245 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 = 5.0V ± 5% Symbol VIH Parameter Input HIGH Voltage VIL Input LOW Voltage Test Conditions Guaranteed Logic HIGH for Control Pins Min. 2 Typ.(1) — Max. — Unit V Guaranteed Logic LOW for Control Pins — — 0.8 V IIN Input Leakage Current (Control 0V ≤ VIN ≤ Vcc — — ±1 µA IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ Vcc, Switches OFF — ±0.001 ±1 µA RON Switch ON Resistance Vcc = Min., VIN = 0V, ION = 30mA — 5 7 Ω RON Switch ON Resistance Vcc = Min., VIN = 2.4V, ION = 15mA — 10 15 Ω VP Pass Voltage (2) VIN = Vcc = 5V, IOUT = -5µA 3.7 4 4.2 V Inputs) (2) NOTES: 1. Typical values are at VCC = 5.0V, 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 V IN (Volts) 3 2.5 3.0 3.5 IDTQS3245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol ICCQ Parameter Quiescent Power Supply Current Test Conditions(1) VCC = Max., VIN = GND or Vcc, f = 0 ∆ICC Power Supply Current per Control Input HIGH (2) VCC = Max., VIN = 3.4V, f = 0 1.5 mA ICCD Dynamic Power Supply Current per MHz(3) VCC = Max., A and B pins open Control Inputs Toggling at 50% Duty Cycle 0.25 mA/MHz Max. 3 Unit µA 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). A and B 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 Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5% CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted. Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ Parameter Data Propagation Delay (2,3) An to/from Bn Switch Turn-on Delay OE to An/Bn Switch Turn-off Delay (2) OE to An/Bn Min. (1) Typ. — — 0.25 ns — 5.6 ns — 4.5 ns 0.5 0.5 Max. Unit 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 IDTQS3245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION ID TQS XXXXX Device Type XX Package X Process Blank Industrial (-40°C to +85°C) SO Q PA Small Outline IC (SO20-2) Quarter Size Outline Package (SO20-8) Thin Shrink Small Outline Package (SO20-9) 3245 High Speed C MOS 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* *To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2. The IDT logo, QuickSwitch, and SynchroSwitch are registered trademarks of Integrated Device Technology, Inc. 5