VS32X245 / VS32X2245 High Speed CMOS VSwitch 16-Bit Bus Switches Applications •= 5V to 3.3V translation in mixed-supply environment •= Logic replacement •= Hot-swap interface •= Bus isolation General Description The VS32X245 and VS32X2245 are high-speed TTL-compatible 16-bit bus switches in a flow-through pinout. Each device contains two banks of 8-bit switches with a common active-LOW enable (/OEx) for each bank. The low ON resistance of the VS32X245 allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal noise. The VS32X2245 has 25Ω resistors in series with the switches to reduce ground-bounce noise from the driving source and signal reflection. The VS32X245 and VS32X2245 bus switches are function and pinout compatible with QS32X245 and QS32X2245 switches. They enable 5V to 3.3V translation when used with a diode in the power supply line. In addition, the high off-isolation in the ‘disable’ mode makes these switches ideal interface elements for hotswap applications. Features •= Enhanced N-FET with no DC path to VCC or GND in normal operating signal voltage range. •= Zero added ground bounce or signal noise •= TTL-compatible control signals •= •= Low impedance bidirectional data flow: 5Ω (VS32X245) and 25Ω (VS32X2245) Undershoot clamp diodes on all switch and control pins •= •= Pin-compatible with QS32X245 and QS32X2245 switches. ESD rating >2000V (Human Body Model) or >200V (Machine Model) •= Latch-up current >100mA •= Near-zero propagation delay •= Available in 150-mil wide 40 pin QSOP package Figure 1. Functional Block Diagram A0 A1 A2 A3 A4 A5 Figure 2. Pin Configuration QSOP A6 A7 (All Pins Top View) /OE1 B0 B1 B2 B3 B4 B5 B6 B7 A8 A9 A10 A11 A12 A13 A14 A15 /OE2 B8 B9 B10 B11 B12 B13 B14 B15 2001-04-12 NC A0 A1 A2 A3 A4 A5 A6 A7 GND NC A8 A9 A10 A11 A12 A13 A14 A15 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 VCC /OE1 B0 B1 B2 B3 B4 B5 B6 B7 VCC /OE2 B8 B9 B10 B11 B12 B13 B14 B15 Page 1 MDSS-0013-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS32X245/VS32X2245 Table 1. Pin Description Name I/O Description A0 – A15 I/O Bus A – Data Input or Output /OE1, /OE2 I Output enable B0 – B15 I/O Bus B – Data Output or Input Table 2. Function Table /OE1 /OE2 A0 - A7 A8 – A15 Function H H Hi - Z Hi - Z Disconnect L H B0 – B7 Hi - Z Connect H L Hi - Z B8 – B15 Connect L L B0 – B7 B8 – B15 Connect Table 3. Absolute Maximum Ratings Supply Voltage to Ground………………………….…..-0.5V to +7.0V DC Switch Voltage VS……………………….………….-0.5V to +7.0V DC Input Voltage VIN………………………………… ...-0.5V to +7.0V AC Input Voltage (Pulse Width < 20ns)……………….…………-3.0V DC Output Sink Current per Switch Pin…………………...…..120 mA Maximum Power Dissipation…………………………….…..0.92 Watts o o Storage Temperature………………………………...-65 C to +150 C Note ABSOLUTE MAXIMUM CONTINUOUS RATINGS are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Correct functional operation while operating in the absolute maximum rated conditions is not implied. Table 4. Capacitance o TA = 25 C, f = 1 MHz, VIN = 0V, VOUT = 0V QSOP Pins Typ Max Unit Control Inputs 4 5 pF VSwitch Channels 5 7 pF (Switch OFF) Note Capacitance is guaranteed, but not production tested. Total capacitance of a path, when the switch is closed, is the sum of the switch terminal capacitances. 2001-04-12 Page 2 MDSS-0013-01 www. vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS32X245/VS32X2245 Table 5. Recommended Operating Conditions Symbol Parameter Conditions Min Typ Max Units VCC Power supply voltage 4.5 5.5 V VIL Low level input voltage -0.5 0.8 V VIH High level input voltage 2.0 5.5 V TA Operating free-air temperature -40 85 o C Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol VIK Parameter Clamp Voltage Test Conditions Control Input Min Typ (1) VCC = Min, IIK = -18 mA Switch I/O VOH Logic High Voltage Max Units -1.5 V -1.5 Switch I/O VIN = VCC = 5V, IOUT = -5µA 3.7 3.9 4.1 VCC = 4.3V, VIN = 5V, 3.0 3.3 3.6 V IOUT = -5µA |II| Input Leakage Current Control Input VCC = Max, VI = VCC or GND 1 µA |OFF| Power OFF Leakage Current Control Input VCC = 0, 1 µA Switch I/O VI or VO = VCC or GND OFF State Leakage Current Switch I/O VCC = Max, VI/O = VCC, 1 µA Switch I/O Drive Current (Logic LOW) VCC = Min, VIN = 0, VS32X245 VOUT = 0.4V VS32X2245 Switch I/O Drive Current (Logic HIGH) VCC = Min, VIN = VCC, VS32X245 VOUT = 2.4V VS32X2245 VCC = Min, VIN = 0, VS32X245 IOUT = 30mA VS32X2245 |IOZ| IODL IODH RON Switch ON (2) Resistance /OE = VCC 50 mA mA -50 mA mA 20 5 7 Ω 28 40 Ω Notes: 1. 2. Typical values are specified at VCC = 5.0V and TA = 25oC. RON is measured by forcing specified current into the ‘output’ node of the switch with the ‘input’ node of the switch at the the specified voltage Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range Symbol Parameter Test Conditions Max Units 6 µA VCC = Max, VIN = 3.4V, f = 0 1.5 mA VCC = Max, Switch pins open, 0.25 mA/MHz ICCQ Quiescent Power Supply Current VCC = Max, ∆ICC Power Supply Current per Input High (2) (Control Input) QCCD Dynamic Power Supply Current (3) (1) /OE = VCC or GND, f = 0 Control Inputs toggling at 50% duty cycle Notes: 1. 2. 3. For conditions shown as Min or Max, use the appropriate values per Recommended Operating Conditions. Per TTL-driven control input. All other control inputs at GND. Switch I/O pins do not contribute to ∆ICC. This parameter represents the average DC current resulting from the switching of internal nodes of the device at a given frequency. The switch I/O pins make insignificant contribution to the dynamic power supply current of the device. This parameter is guaranteed, but not production tested. 2001-04-12 Page 3 MDSS-0013-01 www. vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS32X245/VS32X2245 Figure 3. VOLTAGE TRANSLATION 5 4.5 4 4.0 Vout (V) Figure 4. VOH CHARACTERISTICS VCC = 4.3V 3 2 3.5 VOH Output Voltage (V) 3.0 1 2.5 TA = 85°C TA = 25°C TA = - 40°C 2.0 0 1 0 2 3 Vin (V) 4 5.2 4.75 5.0 VCC – Supply Voltage (V) 4.5 5 5.5 Figure 5. Voltage Translation Application VCC = 5V 1N4148 or equivalent 10K VCC 5V DEVICE I/O I/O 3.3V DEVICE VS32X245 VS32X2245 /OEX 2001-04-12 Page 4 MDSS-0013-01 www. vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS32X245/VS32X2245 Table 8. Switching Characteristics Over Operating Range o o TA = -40 C to +85 C, VCC = 5.0V + 10% CLOAD = 50pF, RLOAD = 500Ω unless otherwise stated. Symbol Description (2,3) (1) Min through the switch (3) VS3245 Max VS32245 (3) Min Max 0.25 1.25 ns Units tPLH, tPHL Data Propagation Delay tPZH, tPZL Switch Turn-on Delay, /OEX to An, Bn 0.5 5.6 0.5 6.6 ns tPLZ, tPHZ Switch Turn-off Delay /OEX to An, Bn 0.5 4.5 0.5 4.5 ns Notes: 1. 2. 3. See test circuits and waveforms. This parameter is the calculated theoretical RC time constant of ON-state resistance of the switch and the specified load capacitance when driven by an ideal voltage source (zero source impedance). This time-constant is on the order of 0.25 ns for VS32X245 and 1.25 ns for VS32X2245. Since this time-constant is much smaller than rise/fall times of typical driving signals, it adds very little propagation delay to the system. This parameter is guaranteed, but not production tested. Figure 6. AC Test Circuit and Switching Waveforms Load Switch Position AC Test Circuit TEST S1 7V VIN Pulse Generator VOUT RL 450Ω 2001-04-12 CL tPLH, tPHL Open tPLZ, tPZL Closed tPHZ, tPZH Open 500Ω DUT 50Ω S1 50Ω=Coax to Oscilloscope Input Conditions Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) Page 5 MDSS-0013-01 www. vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS32X245/VS32X2245 Switching Waveforms 3.0 V Input 1.5 V 0V tPLH tPHL VOH Switch Output 1.5 V VOL Propagation Delay 3.0 V 1.5 V Control Input 0V tPZH tPHZ VOH 0.3 V Switch Output (Switch Input = 3.0 V) 1.5 V 0V tPLZ Switch Output (Switch Input = 0 V) tPZL 0.3 V Switch ON Switch OFF 3.5 V 1.5 V VOL Switch ON Enable and Disable Times Ordering Information Part Number VS32X245Q2 VS32X2245Q2 2001-04-12 No. of Pins 40 40 Package QSOP QSOP Temperature -40°C to +85°C -40°C to +85°C Page 6 MDSS-0013-01 www. vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063