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| VS3125 Quad Bus Switch with Individual Active Low Enables Applications *= *= *= 5v to 3.3V translation in mixed supply environment Hot Swap interface Video, audio switching *= *= Clock gating Logic replacement 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. Low impedance bidirectional data flow Pin-compatible with QS3125 & PI5C3125 switches Zero added ground bounce or signal noise TTL-compatible control signals *= *= *= *= *= Near-zero propagation delay Undershoot clamp diodes on all switch and control pins ESD rating >2000V (Human Body Model) or >200V (Machine Model) Latch-up current >100mA Available in 150-mil wide QSOP package Figure 1. Functional Block Diagram Figure 2. Pin Configuration 1A /1OE /2OE /3OE /4OE 1Y 2A 3A 4A QSOP NC /1OE 1A 1Y /2OE 2A 2Y GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC /4OE 4A 4Y /3OE 3A 3Y NC 2Y 3Y 4Y All Pins, Top View NC= No Connect 2001-04-12 Vaishali Semiconductor Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0011-01 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Table 1. Pin Description Name 1A - 4A 1Y - 4Y /1OE - /4OE I/O I/O I/O I Description Data Input or Output Data Input or Output Bus Switch Enable Table 2. Function Table /xOE L H Path xA <-> xY High Impedance Function Enable switch 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 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. o o Table 4. Capacitance TA = 25 C, f = 1MHz, VIN = 0V, VOUT = 0V o QSOP Pins Control Inputs VSwitch Channels ( Switch OFF ) Typ 4 5 Max 5 7 Unit pF 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 VCC VIL Parameter Power supply voltage Low level input voltage (Control inputs) Min 4.5 -0.5 Typ Max 5.5 0.8 Units V V VIH High level input voltage (Control inputs) 2.0 5.5 V o TA 2001-04-12 Operating free-air temperature -40 85 C MDSS-0011-01 Ph. 408.377.6060 Fax 408.377.6063 Note: All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation Page 2 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 Vaishali Semiconductor VS3125 Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol VIK Parameter Clamp Voltage Test Conditions Control Inputs Switch I/O VCC = Min., IIK = -18mA Min Typ (1) Max -1.5 -1.5 Units V VOH Logic High Voltage VCC= 4.3V,VIN = 5V Switch I/O VIN = VCC = 5V, IOUT = -5A VCC= 4.3V,VIN = 5V, IOUT = -100A 3.7 3.0 3.9 3.3 4.1 3.6 V |II| |OFF| Input Leakage Current Power OFF Leakage Current OFF State Leakage Current Switch I/O Drive Current (Logic LOW) Switch I/O Drive Current (Logic HIGH) Switch ON (2) Resistance Control Inputs Control Inputs Switch I/O Switch I/O VCC = Max., VI = VCC or GND VCC = 0, VI or VO = VCC or GND. 1 1 A A A |IOZ| VCC = Max., VI/O = VCC, /xOE= VCC 1 IODL IODH VCC = Min, VIN = 0, VOUT = 0.4V VCC = Min, VIN = VCC, VOUT = 2.4V 50 -50 (2) mA mA RON VCC = 3.0V, VIN = 0, IOUT = 15mA 5 7 Notes: 1. 2. 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. o Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range Symbol ICCQ ICC Parameter Quiescent Power Supply Current Power Supply Current per Input (2) High Dynamic Power Supply Current (3) Test Conditions (1) Max 1 1.5 Units A mA VCC = Max.,/xOE = VCC or GND, f = 0 VCC = Max, VIN = 3.4V, f = 0 QCCD VCC = Max, Switch pins open, Control Inputs toggling at 50% duty cycle 0.25 mA/MHz 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 Vaishali Semiconductor Page 3 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0011-01 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Figure 3. VOLTAGE TRANSLATION Figure 4. VOH CHARACTERISTICS 5 4 3 2 1 0 0 VCC = 4.3V VOH 4.5 4.0 3.5 3.0 2.5 2.0 1 2 Vin (V) 3 4 5 4.5 4.75 5.0 5.25 5.5 TA = 85C TA = 25C TA = - 40C Vout (V) Output Voltage (V) VCC - Supply Voltage (V) Figure 5. Voltage Translation. Application VCC = 5V 1N4148 or equivalent 10K VCC 5V DEVICE I/O VS3125 I/O 3.3V DEVICE /E 2001-04-12 Vaishali Semiconductor Page 4 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0011-01 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Table 8. Switching Characteristics Over Operating Range TA = -40 C to +85 C, VCC = 5V + 10% CLOAD = 50pF, RLOAD = 500 unless otherwise stated. o o Symbol tPLH, tPHL tPZH, tPZL tPLZ, tPHZ Description (1) (2,3) Min through the switch 1.5 1.5 (3) Max 0.25 6.5 5.5 Units ns ns ns Data Propagation Delay Switch Turn-on Delay, /xOE to xA or xY Switch Turn-off Delay (3) , /xOE to xA or xY Notes: 1. 2. 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. 3. Figure 6. AC Test Circuit and Switching Waveforms AC Test Circuit S1 7V Load Switch Position TEST tPLH, tPHL tPLZ, tPZL S1 Open Closed Open Pulse Generator 50 VIN DUT VOUT 500 RL 450 tPHZ, tPZH Input Conditions 50=Coax to Oscilloscope CL 1. Input voltage = 0 V to 3.0 V 2. tr = tf = 2.5ns (10% to 90%) 2001-04-12 Vaishali Semiconductor Page 5 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0011-01 Ph. 408.377.6060 Fax 408.377.6063 VS3125 Switching Waveforms 3.0 V Input 1.5 V 0V tPLH Switch Output tPHL VOH 1.5 V VOL Propagation Delay Control Input 3.0 V 1.5 V 0V tPHZ tPZH VOH 1.5 V 0V tPLZ tPZL 0.3 V Switch ON Switch OFF 3.5 V 1.5 V VOL 0.3 V Switch Output (Switch Input = 3.0 V) Switch Output (Switch Input = 0 V) Switch ON Enable and Disable Times Ordering Information Part Number VS3125Q No. of Pins 16 Package QSOP Temperature -40C to +85C 2001-04-12 Vaishali Semiconductor Page 6 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0011-01 Ph. 408.377.6060 Fax 408.377.6063 |
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