IDTQS3V245 3.3V HIGH SPEED BUS SWITCH INDUSTRIAL TEMPERATURE RANGE QUICKSWITCH® PRODUCTS 3.3V HIGH SPEED BUS SWITCH FEATURES: DESCRIPTION: 5Ω Ω bi-directional switches connect inputs to outputs Pin compatibility with QS3245 250ps propagation delay Undershoot Clamp Diodes on all switch and control Inputs LVTTL-compatible control Inputs Available in SOIC and QSOP packages • • • • • • IDTQS3V245 The QS3V245 is an 8-bit high speed bus switch controlled by LVTTLcompatible active low enable signal. When closed, the switches exhibit near zero propagation delay without generating additional ground bounce or switching noise. The QS3V245 is specially designed for direct interface between 3.3V and 2.5V devices without any external components. When operating from a 3.3V supply, the logic high level at the switch output is clamped to 2.5V when the switch input signal exceeds 2.5V. This device can be used for switching 2.5V buses without signal attenuation. The ON resistance at 3.3V VCC is less than 5Ω typical, providing near zero propagation delay through the switch. Absence of DC path from switch I/O pins to VCC or ground makes QS3V245 an ideal device for hot swapping applications. The QS3V245 is characterized for operation from -40°C to +85°C. APPLICATIONS: • 3.3V to 2.5V voltage translation • 2.5V to 1.8V voltage translation • PCI bus isolation hot swap FUNCTIONAL BLOCK DIAGRAM OE 2 3 4 5 6 7 8 9 A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 18 17 16 15 14 13 12 11 19 The IDT logo is a registered trademark of Integrated Device Technology, Inc. NOVEMBER 2000 INDUSTRIAL TEMPERATURE RANGE 1 c 2000 Integrated Device Technology, Inc. DSC-5512/1 IDTQS3V245 3.3V HIGH SPEED BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION NC 1 20 VCC A0 2 19 OE A1 3 18 B0 A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 10 11 B7 GND Symbol Description Max Unit VTERM(2) Supply Voltage to Ground –0.5 to +4.6 V VS DC Switch Voltage –0.5 to +4.6 V VIN DC Input Voltage –0.5 to +4.6 V VAC AC Input Voltage (pulse width ≤20ns) –3 V IOUT DC Output Current (max. sink current/pin) 120 mA Maximum Power Dissipation 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. CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V) Parameter(1) Symbol SOIC/ QSOP TOP VIEW Typ. Max. Unit CIN Control Inputs 4 6 pF CI/O Quickswitch Channels (Switch OFF) 5 7 pF NOTE: 1. As applicable to the device type. PIN DESCRIPTION Pin Names Description OE Output Enable Ax Data I/Os Bx Data I/Os FUNCTION TABLE(1) OE Outputs H Disconnected L Ax = Bx NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level 2 IDTQS3V245 3.3V HIGH SPEED 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 = 3.3V ±0.3V Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Inputs 2 — — V VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC — — 1 µA IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF — 0.001 1 µA VCC = Min., VIN = 0V, ION = 8mA — 5 7 VCC = Min., VIN = 1.7V, ION = 8mA — 15 20 VCC = 2.3V, VIN = 0V, ION = 8mA — 7 — RON VP Switch ON Resistance Pass Voltage(2) VCC = 2.3V, VIN = 1.3V, ION = 8mA — 25 — VIN = VCC = 3.3V, IOUT = -5µA 2.3 2.7 2.9 VIN = VCC = 2.5V, IOUT = -5µA — 1.8 — NOTES: 1. Typical values are at VCC = 3.3V and TA = 25°C. 2. Pass voltage is guaranteed, but not production tested. TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V 16 14 12 10 R ON (ohms) 8 6 4 2 0 0 0.5 1 1.5 V IN (Volts) 3 2 2.5 Ω V IDTQS3V245 3.3V HIGH SPEED BUS SWITCH INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS TA = –40°C to +85°C, VCC = 3.3V ±0.3V Symbol Parameter Test Conditions(1) Min. Max. Unit ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 — 3 µA ∆ICC Power Supply Current (2) per Input HIGH VCC = Max., VIN = 3V or VCC, f = 0 per Control Input — 30 µA ICCD Dynamic Power Supply Current per MHz (3) VCC = 3.3V, A and B Pins Open, Control Input Toggling — 0.15 mA/MHz @ 50% Duty Cycle NOTES: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics. 2. Per TTL driven input (VIN = 3V, 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 B inputs generate no significant AC or DC currents as they transition. This parameter is guaranteed but not production tested. SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1) TA = -40°C to +85°C Symbol Parameter Min. Typ. Max. Unit tPLH Data Propagation Delay(2,3) 0.25 ns tPHL Ax to/from Bx 0.5 6.5 ns 0.5 4 ns tPZL Switch Turn-On Delay tPZH OE to Ax/Bx tPLZ Switch Turn-Off Delay(2) tPHZ OE to Ax/Bx NOTES: 1. See TEST CIRCUITS AND WAVEFORMS. Minimums 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 = 30pF. 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 IDTQS3V245 3.3V HIGH SPEED BUS SWITCH INDUSTRIAL TEMPERATURE RANGE OUTPUT VI CHARACTERISTICS VOUT (Volts) 2 250 200 -100 IOs - (mA) IOs - (mA) 1 -50 150 100 50 3 -150 -200 -250 0 -300 0 0.5 1 2 1.5 VOUT (Volts) Outputs Low Characteristic Outputs High Characteristic PASS VOLTAGE vs VCC V O UT - (Volts) 3 2.5 V OUT = 2.5V @ V CC = 3.3V V O UT = 1.8V @ V CC = 2.5V 2 1.5 2.2 2.4 2.7 3 V CC (V) 5 3.3 3.6 4 IDTQS3V245 3.3V HIGH SPEED BUS SWITCH INDUSTRIAL TEMPERATURE RANGE 3.3V TO 2.5V VOLTAGE TRANSLATION 3.3V V OUT 3.3V Supply 2.5V 2.5V Output of Switch 3.3V QS3V245 2.5V 2.5V V IN 0V 3.3V Input of Switch 2.5V TO 1.8V VOLTAGE TRANSLATION 2.5V V O UT 1.8V 1.8V QS3V245 1.8V 1.8V Output of Switch 2.5V 2.5V Supply V IN 0V 2.5V Input of Switch 6 IDTQS3V245 3.3V HIGH SPEED BUS SWITCH INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDTQS XXXXX Device Type XX Package CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 SO Q Small Outline IC (Gull Wing) Quarter Size Small Outline Package 3V245 3.3V High Speed Bus Switch for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 7 for Tech Support: [email protected] (408) 654-6459