VS3345 VS32345 MDSS-0010-01 VS3345/VS32345 1N4148 VS3245 VS32245 VS3345Q

High Speed CMOS VSwitch 8-Bit Bus Switches with Active High & Low Enables Applications ·= 5V to 3.3V translation in

VS3345 VS3345 / VS32345 VS32345 High Speed CMOS VSwitch 8-Bit Bus Switches with Active High & Low Enables Applications ·= 5V to 3.3V translation in mixed-supply environment ·= Logic replacement ·= Hot-swap interface ·= Bus isolation General Description The VS3345 VS3345 and VS32345 VS32345 are high-speed TTLcompatible 8-bit bus switches. The VS3345 VS3345 contains eight high-speed bus switches, with common active low (/OE) and active high (OE) enables. The low ON resistance of the VS3345 VS3345 allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal noise. The VS32345 VS32345 has 25 resistors in series with the switches to reduce ground-bounce noise and signal reflection. The VS3345 VS3345 and VS32345 VS32345 bus switches switches 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 VS3345 VS3345 and VS32345 VS32345 ideal interface elements for hot-swap applications. Features ·= ·= TTL-compatible control signals ·= Enhanced N-FET with no DC path to VCC or GND in normal operating signal voltage range. Undershoot clamp diodes on all switch and control pins ·= Low impedance bidirectional data flow: 5 (VS3345 VS3345) and 25 (VS32345 VS32345) ·= ESD rating >2000V (Human Body Model) or >200V (Machine Model) ·= Near-zero propagation delay ·= Latch-up current >100mA ·= Zero added ground bounce or signal noise ·= Available in 150-mil wide QSOP package Figure 1. Functional Block Diagram Figure 2. Pin Configuration (All Pins Top View) QSOP A0 A1 A2 A3 A4 A5 A6 A7 VCC OE 1 20 A0 2 19 /OE A1 2001-04-12 Vaishali Semiconductor B4 B5 B6 Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 B7 16 B2 6 15 B3 7 14 B4 8 13 B5 A7 B3 5 A6 B2 B1 A5 B1 17 A4 B0 4 A3 /OE 18 A2 OE 3 B0 9 12 B6 10 11 B7 GND MDSS-0010-01 MDSS-0010-01 Ph. 408.377.6060 Fax 408.377.6063 VS3345/VS32345 VS3345/VS32345 Table 1. Pin Description Name I/O Description A0 - A7 I/O Data Input or Output /OE I Active Low Enable Input OE I Active High Enable Input B0 B7 I/O Data Output or Input Table 2. Function Table Input /OE Path Function OE H X Hi Impedance Disable all switches X L Hi Impedance Disable all switches L H An Bn An = Bn Note: X = Don't care 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 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 whiled 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 Vaishali Semiconductor Page 2 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0010-01 MDSS-0010-01 Ph. 408.377.6060 Fax 408.377.6063 VS3345/VS32345 VS3345/VS32345 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 Control Input (1) Min Typ VCC = Min, IIK = -18 mA Switch I/O VOH Logic High Voltage Max Units -1.5 Test Conditions 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 V 3.6 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, VS3345 VS3345 VOUT = 0.4V VS32345 VS32345 Switch I/O Drive Current (Logic HIGH) VCC = Min, VIN = VCC, VS3345 VS3345 VOUT = 2.4V VS32345 VS32345 VCC = Min, VIN = 0, VS3345 VS3345 IOUT = 30mA VS32345 VS32345 |IOZ| IODL IODH RON Switch ON (2) Resistance /OE = VCC or OE = GND 50 mA mA -50 mA mA 5 28 20 7 40 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 1 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, 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-0010-01 MDSS-0010-01 Ph. 408.377.6060 Fax 408.377.6063 VS3345/VS32345 VS3345/VS32345 Figure 3. VOLTAGE TRANSLATION Figure 4. VOH CHARACTERISTICS 5 4.5 4 4.0 Vout (V) VCC = 4.3V 3 2 3.5 VOH Output Voltage (V) 3.0 1 TA = 85°C TA = 25°C TA = - 40°C 2.5 2.0 0 1 0 2 3 Vin (V) 4 4.5 5 4.75 5.0 5.25 5.5 VCC Supply Voltage (V) Figure 5. Voltage Translation Application VCC = 5V 1N4148 1N4148 or equivalent 10k VCC I/O 5V DEVICE I/O 3.3V DEVICE VS3345 VS3345 VS32345 VS32345 10k OE /OE 2001-04-12 Vaishali Semiconductor Page 4 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0010-01 MDSS-0010-01 Ph. 408.377.6060 Fax 408.377.6063 VS3345/VS32345 VS3345/VS32345 Table 8. Switching Characteristics Over Operating Range o o TA = -40 C to +85 C, VCC = 5.0V + 10% CLOAD = 50pF, RLOAD = 500 unless otherwise stated. Symbol Description (2,3) (1) through the switch (3) VS3245 VS3245 Max VS32245 VS32245 (3) Min Max 0.25 Min 1.25 ns Units tPLH, tPHL Data Propagation Delay tPZH, tPZL Switch Turn-on Delay: /OE, OE to An, Bn 0.5 5.6 0.5 6.6 ns tPLZ, tPHZ Switch Turn-off Delay: /OE, OE 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 VS3345 VS3345 and 1.25 ns for VS32345 VS32345. 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 tPLH, tPHL 7V VIN Pulse Generator VOUT RL 450 2001-04-12 Vaishali Semiconductor CL tPLZ, tPZL Closed Open 500 DUT 50 Open tPHZ, tPZH S1 50=Coax to Oscilloscope Page 5 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 Input Conditions Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) MDSS-0010-01 MDSS-0010-01 Ph. 408.377.6060 Fax 408.377.6063 VS3345/VS32345 VS3345/VS32345 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 VS3345Q VS3345Q VS32345Q VS32345Q 2001-04-12 Vaishali Semiconductor No. of Pins 20 20 Package QSOP QSOP Page 6 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 Temperature -40°C to +85°C -40°C to +85°C MDSS-0010-01 MDSS-0010-01 Ph. 408.377.6060 Fax 408.377.6063