VS3125 Quad Bus Switch with Individual Active Low Enables Applications •= 5v to 3.3V translation in mixed supply environment •= Clock gating •= Hot Swap interface •= Logic replacement •= Video, audio switching General Description The VS3125 contains a set of four high-speed, low-resistance bus switches. Each bus switch is individually controlled by TTL-compatible, active-low control input (/xOE). The low ON resistance of VS3125 allows inputs to be connected to outputs without adding propagation delay and without generating additional signal noise. The VS3125 is function and pinout compatible with QS3125. It enables 5V to 3.3V level translation when used with an external diode in the power supply line. In addition, the high off-isolation between switch terminals in the ‘disable’ mode, and the near-zero propagation delay in the ‘on’ state make the VS3V125 an ideal interface element for hot-swapping applications. Features •= Enhanced N-FET with no dc path to VCC or GND in normal operating signal voltage range. •= Near-zero propagation delay •= Undershoot clamp diodes on all switch and control pins •= Low impedance bidirectional data flow •= Pin-compatible with QS3125 & PI5C3125 switches •= ESD rating >2000V (Human Body Model) or >200V (Machine Model) •= Zero added ground bounce or signal noise •= Latch-up current >100mA •= TTL-compatible control signals •= Available in 150-mil wide QSOP package Figure 1. Functional Block Diagram 1A 2A Figure 2. Pin Configuration 3A 4A QSOP /1OE /2OE /3OE /4OE 1Y 2001-04-12 2Y 3Y 4Y NC 1 16 VCC /1OE 1A 2 15 /4OE 3 14 4A 1Y 4 13 4Y /2OE 2A 5 6 12 11 2Y 7 10 /3OE 3A 3Y GND 8 9 NC All Pins, Top View NC= No Connect Page 1 MDSS-0011-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Table 1. Pin Description Name I/O Description 1A – 4A I/O Data Input or Output 1Y – 4Y I/O Data Input or Output /1OE - /4OE I Bus Switch Enable Table 2. Function Table /xOE Path Function L xA <-> xY Enable switch H High Impedance Disable switch 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…………………...…..120mA Maximum Power Dissipation…………………………….…..0.5 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. Functional operation under absolute maximum rated conditions is not implied. Table 4. Capacitance o TA = 25 C, f = 1MHz, VIN = 0V, VOUT = 0V QSOP Pins Typ Max Unit Control Inputs 4 5 pF VSwitch Channels ( Switch OFF ) 5 7 pF 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. Table 5. Recommended Operating Conditions Symbol Parameter Min Max Units VCC Power supply voltage 4.5 Typ 5.5 V VIL Low level input voltage -0.5 0.8 V 2.0 5.5 V -40 85 o (Control inputs) VIH High level input voltage (Control inputs) TA Operating free-air temperature C Note: All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation 2001-04-12 Page 2 MDSS-0011-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol Parameter Test Conditions VIK Clamp Voltage Control Inputs Min Typ (1) VCC = Min., IIK = -18mA Switch I/O VOH Logic High Voltage Max Units -1.5 V -1.5 Switch I/O VCC= 4.3V,VIN = 5V VIN = VCC = 5V, IOUT = -5µA 3.7 3.9 4.1 VCC= 4.3V,VIN = 5V, 3.0 3.3 3.6 V IOUT = -100µA |II| Input Leakage Current Control Inputs VCC = Max., VI = VCC or GND 1 µA |OFF| Power OFF Leakage Current Control Inputs VCC = 0, VI or VO = VCC or GND. 1 µA VCC = Max., VI/O = VCC, 1 µA |IOZ| Switch I/O OFF State Leakage Current Switch I/O IODL Switch I/O Drive Current (Logic LOW) VCC = Min, VIN = 0, VOUT = 0.4V 50 mA IODH Switch I/O Drive Current (Logic HIGH) VCC = Min, VIN = VCC, VOUT = 2.4V -50 mA RON Switch ON (2) Resistance VCC = 3.0V, VIN = 0, IOUT = 15mA /xOE= VCC Notes: 1. 2. 5 (2) 7 Ω o Typical value is specified at VCC = 5V and TA = 25 C. RON is measured by forcing specified current into the ‘output’ node of the switch with the ‘input’ node of the switch at the specified voltage. Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range (1) Symbol Parameter Test Conditions Max Units ICCQ Quiescent Power Supply Current VCC = Max.,/xOE = VCC or GND, f = 0 1 µA ∆ICC Power Supply Current per Input (2) High VCC = Max, VIN = 3.4V, f = 0 1.5 mA QCCD Dynamic Power Supply Current VCC = Max, Switch pins open, Control Inputs toggling at 50% duty cycle 0.25 mA/MHz (3) Notes: 1. 2. 3. For conditions shown as Min or Max, use the appropriate values specified under Recommended Operating Conditions. Per 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-0011-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Figure 4. VOH CHARACTERISTICS Figure 3. VOLTAGE TRANSLATION Vout (V) 5 4.5 4 4.0 VCC = 4.3V 3 VOH TA = 85°C TA = 25°C TA = - 40°C 3.5 Output Voltage 2 3.0 (V) 2.5 1 2.0 0 1 0 2 3 4 4.5 5 Vin (V) 4.75 5.0 5.25 5.5 VCC – Supply Voltage (V) Figure 5. Voltage Translation. Application VCC = 5V 1N4148 or equivalent 10K VCC 5V DEVICE I/O I/O 3.3V DEVICE VS3125 /E 2001-04-12 Page 4 MDSS-0011-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Table 8. Switching Characteristics Over Operating Range o o TA = -40 C to +85 C, VCC = 5V + 10% CLOAD = 50pF, RLOAD = 500Ω unless otherwise stated. Symbol Description (1) Min (2,3) tPLH, tPHL Data Propagation Delay tPZH, tPZL Switch Turn-on Delay, /xOE to xA or xY tPLZ, tPHZ Switch Turn-off Delay through the switch (3) , /xOE to xA or xY (3) Max Units - 0.25 ns 1.5 6.5 ns 1.5 5.5 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 of the order of 0.25ns for VS3125. 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 AC Test Circuit Load Switch Position S1 7V VIN Pulse Generator VOUT 500Ω DUT RL 450Ω 50Ω 2001-04-12 CL TEST S1 tPLH, tPHL Open tPLZ, tPZL Closed tPHZ, tPZH Open Input Conditions 50Ω=Coax to Oscilloscope 1. Input voltage = 0 V to 3.0 V 2. tr = tf = 2.5ns (10% to 90%) Page 5 MDSS-0011-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3125 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 VS3125Q 2001-04-12 No. of Pins 16 Package QSOP Temperature -40°C to +85°C Page 6 MDSS-0011-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063