VS3245

VS3245 / VS32245 High Speed CMOS VSwitch 8-Bit Bus Switches Applications •= •= 5V to 3.3V translation in mixed-supply environment Hot-swap interface •= •= Logic replacement Bus isolation General Description The VS3245 and VS32245 are high-speed TTL–compatible 8-bit bus switches. The VS3245 contains eight high-speed bus switches, with a common active low enable (/OE). The low ON resistance of the VS3245 allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal noise. The VS32245 has 25Ω resistors in series with the switches to reduce ground-bounce noise and signal reflection. The VS3245 and VS32245 bus switches are function and pinout compatible with QS3245 and CBT3245 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 VS3245 and VS32245 ideal interface elements for hot-swap applications. Features •= •= •= •= Enhanced N-FET with no DC path to VCC or GND in normal operating signal voltage range. Low impedance bidirectional data flow: 5Ω (VS3245) and 25Ω (VS32245) Pin-compatible with QS3245 and CBT3245 switches. Near-zero propagation delay •= •= •= •= •= •= Zero added ground bounce or signal noise TTL-compatible control signals 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 (All Pins Top View) A0 A1 A2 A3 A4 A5 A6 A7 NC A0 A1 A2 1 2 3 4 5 6 7 8 9 QSOP 20 19 18 17 16 15 14 13 12 11 VCC /OE B0 B1 B2 B3 B4 B5 B6 B7 /OE A3 A4 A5 A6 A7 GND 10 B0 B1 B2 B3 B4 B5 B6 B7 2001-04-12 Vaishali Semiconductor Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0007-02 Ph. 408.377.6060 Fax 408.377.6063 VS3245/VS32245 Table 1. Pin Description Name A0 - A7 /OE B0 – B7 I I/O I/O I/O Description Data Input or Output Enable Input Data Output or Input Table 2. Function Table Input /OE H L Hi Impedance An Bn Disable all switches An = Bn Path Function 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…………………………….…..0.5 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. Correct functional operation while operating in the absolute maximum rated conditions is not implied. o o Table 4. Capacitance TA = 25 C, f = 1 MHz, VIN = 0V, VOUT = 0V o QSOP Pins Control Inputs VSwitch Channels (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. Typ 4 5 Max 5 7 Unit pF pF 2001-04-12 Vaishali Semiconductor Page 2 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0007-02 Ph. 408.377.6060 Fax 408.377.6063 VS3245/VS32245 Table 5. Recommended Operating Conditions Symbol VCC VIL VIH TA Parameter Power supply voltage Low level input voltage High level input voltage Operating free-air temperature Conditions Min 4.5 -0.5 2.0 -40 Typ Max 5.5 0.8 5.5 85 V V V o Units C Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol VIK VOH Parameter Clamp Voltage Logic High Voltage Control Input Switch I/O Switch I/O Test Conditions VCC = Min, IIK = -18 mA VIN = VCC = 5V, IOUT = -5µA VCC = 4.3V, VN = 5V, IOUT = -5µA Min Typ (1) Max -1.5 -1.5 Units V V 3.7 3.0 3.9 3.3 4.1 3.6 1 1 1 II |OFF| |IOZ| IODL IODH RON 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 Input Control Input Switch I/O Switch I/O VCC = Max, VI = VCC or GND VCC = 0, VI or VO = VCC or GND VCC = Max, VI/O = VCC, /OE = VCC VS3245 VS32245 VS3245 VS32245 VS3245 VS32245 20 5 28 -50 50 µA µA µA mA mA mA mA VCC = Min, VIN = 0, VOUT = 0.4V VCC = Min, VIN = VCC, VOUT = 2.4V VCC = Min, VIN = 0, IOUT = 30mA 7 40 Ω 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 ICCQ ∆ICC QCCD Parameter Quiescent Power Supply Current Power Supply Current per Input High (2) (Control Input) Dynamic Power Supply Current (3) Test Conditions VCC = Max, VCC = Max, VIN = 3.4V, f = 0 VCC = Max, Switch pins open, (1) Max 1 1.5 0.25 Units µA mA mA/MHz /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 Vaishali Semiconductor Page 3 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0007-02 Ph. 408.377.6060 Fax 408.377.6063 VS3245/VS32245 Figure 3. VOLTAGE TRANSLATION 5 4 Vout (V) 3 2 VCC = 4.3V Figure 4. VOH CHARACTERISTICS 4.5 TA = 85°C TA = 25°C TA = - 40°C 4.0 3.5 VOH Output Voltage (V) 3.0 1 0 0 1 2 3 Vin (V) 4 5 2.5 2.0 4.5 5. 2 4.75 5.0 VCC – Supply Voltage (V) 5.5 Figure 5. Voltage Translation Application VCC = 5V 1N4148 or equivalent 10K VCC 5V DEVICE I/O VS3245 VS32245 /OE I/O 3.3V DEVICE 2001-04-12 Vaishali Semiconductor Page 4 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0007-02 Ph. 408.377.6060 Fax 408.377.6063 VS3245/VS32245 Table 8. Switching Characteristics Over Operating Range TA = -40 C to +85 C, VCC = 5.0V + 10% CLOAD = 50pF, RLOAD = 500Ω unless otherwise stated. o o Symbol tPLH, tPHL tPZH, tPZL tPLZ, tPHZ Description Data Propagation Delay (2,3) (1) Min 0.5 0.5 (3) VS3245 Max 0.25 5.6 4.5 VS32245 (3) Min Max 1.25 0.5 0.5 6.6 4.5 Units ns ns ns through the switch Switch Turn-on Delay, /OE to An, Bn Switch Turn-off Delay /OE to An, Bn 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 on the order of 0.25 ns for VS3245 and 1.25 ns for VS32245. 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 Load Switch Position TEST tPLH, tPHL S1 7V 500Ω RL 450Ω tPLZ, tPZL tPHZ, tPZH VIN DUT VOUT Open Closed Open S1 Pulse Generator 50Ω Input Conditions Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) CL 50Ω=Coax to Oscilloscope 2001-04-12 Vaishali Semiconductor Page 5 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0007-02 Ph. 408.377.6060 Fax 408.377.6063 VS3245/VS32245 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 VS3245Q VS3245QX VS32245Q VS32245QX Marking VS3245Q VS3245Q VS32245Q VS32245Q Shipping/Packaging Tubes Tape & Reel Tubes Tape & Reel No. of Pins 20 20 20 20 Package QSOP QSOP QSOP QSOP Temperature -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C 2001-04-12 Vaishali Semiconductor Page 6 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0007-02 Ph. 408.377.6060 Fax 408.377.6063