VS3257 / VS32257 Quad 2:1 Mux/Demux VSwitch Applications •= 5V to 3.3V translation in mixed-supply environment •= Memory bank, video, & audio swtiching •= Hot-swap interface •= Power conservation •= Logic replacement General Description The VS3257 is a high-speed TTL–compatible Quad 2:1 multiplexer/demultiplexer. The VS3257 contains four mux/demux channels, with a common path control (S) and active low enable (/E). The low ON resistance of the VS3257 allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal noise. The VS32257 has 25Ω resistors in series with the switches to reduce ground-bounce noise and signal reflection. The VS3257 and VS32257 mux/demux switches are function and pinout compatible with QS3257 and CBT3257 switches. They enable 5V to 3.3V translation when used with an external diode in the power supply line. In addition, the high off-isolation in the ‘disable’ mode makes VS3257 and VS32257 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 (VS3257) and 25Ω (VS32257) •= Pin-compatible with QS3257 and CBT3257 switches. •= Near zero propagation delay •= Zero added ground bounce or signal noise •= Break-before-make feature •= 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) S QSOP /E YA YB YC YD 2001-04-12 I0A I1A I0B I1B I0C I1C I0D I1D S 1 16 I0A 2 15 I1A 3 14 VCC /E I0D YA I0B 4 13 I1D 12 11 YD I1B 5 6 YB 7 10 I1C GND 8 9 YC I0C Page 1 MDSS-0009-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 Table 1. Pin Description Name I/O Description I0X, I1X I/O Data Input or Output S I Select Input /E I Enable Input YA - YD I/O Data Output or Input Table 2. Function Table Inputs Path Function /E S H X Hi Impedance Disable all switches L L IOX <-> YX Select 0 L H I1X <-> YX Select 1 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 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 Operation Control Inputs Typ Max Unit 4 5 pF VSwitch Channels Demux 5 7 pF (Switch OFF) Mux 7 8 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. 2001-04-12 Page 2 MDSS-0009-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 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 Note: 1. All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol VIK Parameter Clamp Voltage Test Conditions Control Inputs 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, VN = 5V, 3.0 3.3 3.6 V IOUT = -5µA II Input Leakage Current Control Inputs VCC = Max, VI = VCC or GND 1 µA |OFF| Power OFF Leakage Current Control Inputs VCC = 0, 1 µA Switch I/O VI or VO = VCC or GND |IOZ| OFF State Leakage Current Switch I/O VCC = Max, VI/O = VCC, /E = VCC 1 µA IODL Switch I/O Drive Current (Logic LOW) VCC = Min, VIN = 0, VS3257 VOUT = 0.4V VS32257 VCC = Min, VIN = VCC, VS3257 VOUT = 2.4V VS32257 VCC = Min, VIN = 0, VS3257 IOUT = 30mA VS32257 IODH RON Switch I/O Drive Current (Logic HIGH) Switch ON (2) Resistance 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 (1) Units 1 µA ICCQ Quiescent Power Supply Current VCC = Max, ∆ICC Power Supply Current per Input High (2) (Control Inputs) VCC = Max, VIN = 3.4V, f = 0 1.5 mA QCCD Dynamic Power Supply Current VCC = Max, Switch pins open, 0.25 mA/MHz (3) S, /E = VCC or GND, f = 0 Max 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-0009-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 Figure 4. VOH CHARACTERISTICS Figure 3. VOLTAGE TRANSLATION 4.5 5 TA = 85°C TA = 25°C TA = - 40°C 4.0 4 Vout (V) VCC = 4.3V 2 3.5 VOH Output Voltage (V) 3.0 1 2.5 3 2.0 0 1 0 2 3 4 4.5 5 4.75 5.0 5.25 5.5 VCC – Supply Voltage (V) Vin (V) Figure 5. Voltage Translation. Application VCC = 5V 1N4148 or equivalent 10K VCC 5V DEVICE I/O I/O 3.3V DEVICE VS3257 VS32257 /E 2001-04-12 Page 4 MDSS-0009-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 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 VS3257 Max VS32257 (3) Min Max 0.25 1.25 ns Units tPLH, tPHL Data Propagation Delay tPZH, tPZL Switch Turn-on Delay, S to YX, I0X, or I1X 0.5 5.2 0.5 6.2 ns tPZH, tPZL Switch Turn-on Delay, /E to YX, I0X, or I1X 0.5 4.8 0.5 5.8 ns 0.5 5.0 0.5 5.0 ns tPLZ, tPHZ Switch Turn-off Delay through the switch (3) (3) , S or /E to YX, I0X, or I1X 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 VS3257 and 1.25 ns for VS32257. 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 Open tPLZ, tPZL Closed tPHZ, tPZH Open 500Ω DUT 50Ω S1 tPLH, tPHL 50Ω=Coax to Oscilloscope Input Conditions Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) Page 5 MDSS-0009-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 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 VS3257Q VS32257Q 2001-04-12 No. of Pins 16 16 Package QSOP QSOP Temperature -40°C to +85°C -40°C to +85°C Page 6 MDSS-0009-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063