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| VS3V257 / VS3V2257 High-speed 3.3V CMOS VSwitch Quad 2:1 Mux/Demux Applications *= *= *= 3.3V to 2.5V translation 2.5V to 1.8V translation Hot-Swapping *= *= Logic replacement Memory bank, video, and audio switching General Description The VS3V257 is a high-speed LVTTL-compatible Quad 2:1 multiplexer/demultiplexer. The VS3V257 contains four mux/demux channels, with a common path control (S) and active low enable (/E). The low ON resistance of the VS3V257 allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal noise. The VS3V2257 has 25 resistors in series with the switches to reduce ground-bounce noise and signal reflection. The VS3V257 and VS3V2257 are designed for 3.3V to 2.5V or 2.5V to 1.8V level translation, without any external components. These switches also offer very high impedance between switch terminals in the power-off or "disabled" state. This feature, combined with near-zero propagation delay in the "on" state, makes VS3V257 and VS3V2257 ideal interface elements for hot-swapping applications. Features *= Enhanced N-FET with no DC path to VCC or GND in normal operating signal voltage range. Low impedance switches connect inputs to outputs with near-zero propagation delay: 5 (VS3V257) and 25 (VS3V2257) Pin-compatible with 74LVC257 or equivalent logic devices Zero added ground bounce or signal noise *= *= *= *= *= *= Break-before-make feature 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 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 (All Pins Top View) 2000-11-28 Vaishali Semiconductor Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0001-01 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 Table 1. Pin Description Name I/O Description I0X, I1X S /E YA - YD I/O I I I/O Data Input or Output Select Input Enable Input Data Output or Input Table 2. Function Table Inputs Path /E H L L S X L H Hi Impedance IOX <-> YX I1X <-> YX Function Disable all switches Select 0 Select 1 Table 3. Absolute Maximum Ratings Supply Voltage to Ground....................................-0.5V to +4.6V DC Switch Voltage VS.........................................-0.5V to +4.6V DC Input Voltage VIN..........................................-0.5V to +4.6V AC Input Voltage (Pulse Width < 20ns)...............................-3.0V DC Output Sink Current per Switch Pin.............................128 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 pF pF pF Unit 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) Conditions Min 2.3 Typ Max 3.6 0.7 0.8 V V Units Vcc = 2.3 to 2.7 Vcc =2.7 to 3.6 1.7 Vcc = 2.3 to 2.7 Vcc = 2.7 to 3.6 2.0 -40 VIH High level input voltage (Control inputs) V TA 2000-11-28 Operating free-air temperature 85 o C MDSS-0001-01 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 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 Table 6. Electrical Characteristics Over Recommended Operating Free-air Temperature Range Symbol VIK Parameter Clamp Voltage Control Inputs Switch I/O Test Conditions VCC = Min, IIK = -18 mA Min Typ Max -1.5 -1.5 Units V VOH Logic High Voltage Switch I/O VIN = VCC = 3.3V, IOUT = -5A VIN = VCC = 2.5V, IOUT = -5A 2.1 1.4 2.6 1.9 1 1 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 (1) 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 A A A |IOZ| VCC = Max, VI/O = VCC, /E = VCC 1 IODL VCC = 3.0V, VIN = 0, VOUT = 1.5V VCC = 3.0V, VIN = VCC, VOUT = 1.5V VCC = 3.0V, VIN = 0, IOUT = 15mA VCC = 2.3V, VIN = 0, IOUT = 8mA VS3V257 VS3V2257 VS3V257 VS3V2257 VS3V257 VS3V2257 VS3V257 VS3V2257 50 30 -20 -10 5 20 (2) (2) (3) (3) mA mA mA mA 7 40 14 48 IODH RON 28 10 23 35 Notes: 1. 2. 3. 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 Typical value is specified at VCC = 3.3V and TA = 25 C. o Typical value is specified at VCC = 2.5V and TA = 25 C. Table 7. Power Supply Characteristics Over Recommended Operating Free-air Temperature Range Symbol ICCQ ICC Parameter Quiescent Power Supply Current (2) Test Conditions VCC = Max, VCC = 3.6V, VIN = 3.0V, f = 0 VCC = 2.7V, VIN = 2.1V, f = 0 VCC = Max, Switch pins open, (1) Max 1 300 Units A A S, /E = VCC or GND, f = 0 Power Supply Current per Input High (Control Inputs) Dynamic Power Supply Current (3) QCCD 0.15 mA/MHz 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 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. 2000-11-28 Vaishali Semiconductor Page 3 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0001-01 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 VOLTAGE TRANSLATION 4 3 3 Vcc=3.5V Vcc=3.6V Vcc=3.3V Vcc=3.3V Vcc=3.0V Vcc=3.0V 2 2 VOUT (V) VOUT (V) Vcc=2.7V Vcc=2.5V Vcc=2.3V 1 1 0 0 1 2 3 VIN (V) 4 1 2 VIN (V) 3 Figure 3. 3.3V to 2.5V Translation (TA + 25 C) Figure 4. 2.5V to 1.8V Translation (TA + 25 C) VOH CHARACTERISTICS 3.0 3.0 2.0 2.0 VOH (V) VOH (V) 1.0 1.0 0 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 0 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Supply Voltage - VCC (V) (TA + 25 C) Supply Voltage - VCC (V) (TA + 25 C) Figure 5. VOH CHARACTERISTICS (Vcc = 3.3V nominal) Figure 6. VOH CHARACTERISTICS (Vcc = 2.5V nominal) 2000-11-28 Vaishali Semiconductor Page 4 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0001-01 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 Table 8. Switching Characteristics Over Operating Range - 3.3V Supply Voltage TA = -40 C to +85 C, VCC = 3.3V + 0.3V CLOAD = 30pF, RLOAD = 1k 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) VS3V257 Max 0.25 5.2 4.8 5.0 VS3V2257 (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 Table 9. Switching Characteristics Over Operating Range - 2.5V Supply Voltage TA = -40 C to +85 C, VCC = 2.5V + 0.2V CLOAD = 30pF, RLOAD = 1k unless otherwise stated. o o Symbol tPLH, tPHL tPZH, tPZL tPZH, tPZL tPLZ, tPHZ Description (1) Min (3) VS3V257 Max VS3V2257 (3) Min Max Units ns ns ns ns Data Propagation Delay (2,3) 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 VS3V257 and 1.25 ns for VS3V2257. 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 7. AC Test Circuit and Switching Waveforms AC Test Circuit 3.3V Supply Voltage S1 5V 1k RL 950 50 CL 50=Coax to Oscilloscope Load Switch Position TEST tPLH, tPHL tPLZ, tPZL tPHZ, tPZH Open 5V GND S1 R1 Pulse Generator VIN DUT VOUT Input Conditions Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) 2000-11-28 Vaishali Semiconductor Page 5 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0001-01 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 Switching Waveforms 3.0 V Input 1.5 V 0V tPLH Switch Output tPHL VOH 1.2 V VOL Propagation Delay Control Input 3.0 V 1.5 V 0V tPHZ tPZH VOH 1.2 V 0V tPLZ tPZL 0.15V Switch ON Switch OFF 2.5 V 1.2 V VOL 0.15V Switch Output (Switch Input = 3.0 V) Switch Output (Switch Input = 0 V) Switch ON Enable and Disable Times Ordering Information Part Number VS3V257Q VS3V257QX VS3V2257Q VS3V2257QX Marking VS3V257Q VS3V257Q VS3V2257Q VS3V2257Q Shipping/Packaging Tubes Tape & Reel Tubes Tape & Reel No. of Pins 16 16 16 16 Package QSOP QSOP QSOP QSOP Temperature -40C to +85C -40C to +85C -40C to +85C -40C to +85C 2000-11-28 Vaishali Semiconductor Page 6 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 MDSS-0001-01 Ph. 408.377.6060 Fax 408.377.6063 |
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