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| VS3257 / VS32257 Quad 2:1 Mux/Demux VSwitch Applications *= *= *= 5V to 3.3V translation in mixed-supply environment Hot-swap interface Logic replacement *= *= Memory bank, video, & audio swtiching Power conservation 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 25 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: 5 (VS3257) and 25 (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 /E YA YB YC YD I0A I1A I0B I1B I0C I1C I0D I1D S I0A I1A YA I0B I1B YB GND 1 2 3 4 5 6 7 8 QSOP 16 15 14 13 12 11 10 9 VCC /E I0D I1D YD I0C I1C YC 2001-04-12 Vaishali Semiconductor Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0009-01 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 Table 1. Pin Description Name I0X, I1X S /E YA - YD I I I/O I/O I/O Description Data Input or Output Select Input Enable Input Data Output or Input Table 2. Function Table Inputs /E H L L S X L H Hi Impedance IOX <-> YX I1X <-> YX Disable all switches Select 0 Select 1 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) Demux Mux Operation Typ 4 5 7 Max 5 7 8 Unit pF 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. 2001-04-12 Vaishali Semiconductor Page 2 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0009-01 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 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 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 Control Inputs Switch I/O VOH Logic High Voltage Switch I/O VIN = VCC = 5V, IOUT = -5A VCC = 4.3V, VN = 5V, IOUT = -5A 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 = Min, VIN = 0, VOUT = 0.4V VCC = Min, VIN = VCC, VOUT = 2.4V VCC = Min, VIN = 0, IOUT = 30mA VCC = Max, VI = VCC or GND VCC = 0, VI or VO = VCC or GND VCC = Max, VI/O = VCC, /E = VCC VS3257 VS32257 VS3257 VS32257 VS3257 VS32257 20 5 28 7 40 -50 50 1 A mA mA mA mA 1 1 A A 3.7 3.0 3.9 3.3 Test Conditions VCC = Min, IIK = -18 mA Min Typ (1) Max -1.5 -1.5 4.1 3.6 Units V V |IOZ| IODL IODH RON 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 Inputs) 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 A mA mA/MHz S, /E = 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. Page 3 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0009-01 Ph. 408.377.6060 Fax 408.377.6063 2001-04-12 Vaishali Semiconductor VS3257/VS32257 Figure 3. VOLTAGE TRANSLATION Figure 4. VOH CHARACTERISTICS 5 4 Vout (V) 3 2 1 0 0 VCC = 4.3V 4.5 4.0 3.5 VOH Output Voltage (V) 3.0 2.5 2.0 1 2 Vin (V) 3 4 5 4.5 4.75 5.0 5.25 5.5 VCC - Supply Voltage (V) TA = 85C TA = 25C TA = - 40C Figure 5. Voltage Translation. Application VCC = 5V 1N4148 or equivalent 10K VCC 5V DEVICE I/O VS3257 VS32257 /E I/O 3.3V DEVICE 2001-04-12 Vaishali Semiconductor Page 4 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0009-01 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 Table 8. Switching Characteristics Over Operating Range TA = -40 C to +85 C, VCC = 5.0V + 10% CLOAD = 50pF, RLOAD = 500 unless otherwise stated. o o Symbol tPLH, tPHL tPZH, tPZL tPZH, tPZL tPLZ, tPHZ Description Data Propagation Delay (2,3) (1) Min 0.5 0.5 0.5 (3) VS3257 Max 0.25 5.2 4.8 5.0 VS32257 (3) Min Max 1.25 0.5 0.5 0.5 6.2 5.8 5.0 Units ns ns ns ns through the switch Switch Turn-on Delay, S to YX, I0X, or I1X Switch Turn-on Delay, /E to YX, I0X, or I1X Switch Turn-off Delay (3) , S or /E to YX, I0X, or I1X 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 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. 3. Figure 6. AC Test Circuit and Switching Waveforms AC Test Circuit Load Switch Position TEST tPLH, tPHL S1 7V tPLZ, tPZL tPHZ, tPZH VIN DUT 450 VOUT 500 RL Open Closed Open S1 Pulse Generator 50 Input Conditions Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) CL 50=Coax to Oscilloscope 2001-04-12 Vaishali Semiconductor Page 5 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0009-01 Ph. 408.377.6060 Fax 408.377.6063 VS3257/VS32257 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 VS3257Q VS32257Q No. of Pins 16 16 Package QSOP QSOP Temperature -40C to +85C -40C to +85C 2001-04-12 Vaishali Semiconductor Page 6 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0009-01 Ph. 408.377.6060 Fax 408.377.6063 |
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