VS3V257 / VS3V2257 High-speed 3.3V CMOS VSwitch Quad 2:1 Mux/Demux Applications •= 3.3V to 2.5V translation •= Logic replacement •= 2.5V to 1.8V translation •= •= Hot-Swapping 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 25Ω 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. •= Break-before-make feature •= Undershoot clamp diodes on all switch and control pins Low impedance switches connect inputs to outputs with near-zero propagation delay: 5Ω (VS3V257) and 25Ω (VS3V2257) •= ESD rating >2000V (Human Body Model) •= or >200V (Machine Model) •= Latch-up current >100mA •= Available in 150-mil wide QSOP package •= Pin-compatible with 74LVC257 or equivalent logic devices •= Zero added ground bounce or signal noise Figure 1. Functional Block Diagram Figure 2. Pin Configuration S QSOP /E YA YB YC YD I0A I1A I0B I1B I0C I1C I0D I1D S 1 16 VCC I0A 2 15 I1A 3 14 /E I0D YA I0B 4 13 I1D I1B 5 6 12 11 YD I0C YB 7 10 I1C GND 8 9 YC (All Pins Top View) 2000-11-28 Page 1 MDSS-0001-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 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 +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 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. Table 5. Recommended Operating Conditions Symbol Parameter VCC Power supply voltage VIL Low level input voltage (Control inputs) VIH High level input voltage (Control inputs) Conditions Operating free-air temperature Typ Max 3.6 Units V V Vcc = 2.3 to 2.7 0.7 Vcc =2.7 to 3.6 0.8 1.7 V Vcc = 2.3 to 2.7 Vcc = 2.7 to 3.6 TA Min 2.3 2.0 -40 85 o C Note: All unused control inputs of the device must be held at Vcc or GND, to ensure proper device operation 2000-11-28 Page 2 MDSS-0001-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 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 Test Conditions Control Inputs Min Typ VCC = Min, IIK = -18 mA Switch I/O VOH Logic High Voltage Switch I/O Max Units -1.5 V -1.5 VIN = VCC = 3.3V, IOUT = -5µA 2.1 2.6 VIN = VCC = 2.5V, IOUT = -5µA 1.4 1.9 V II Input Leakage Current Control Inputs VCC = Max, VI = VCC or GND 1 µA |OFF| Power OFF Leakage Current Control Inputs VCC = 0, VI or VO = VCC or GND 1 µA VCC = Max, VI/O = VCC, 1 µA |IOZ| IODL IODH RON Switch I/O OFF State Leakage Current Switch I/O Switch I/O Drive Current (Logic LOW) VCC = 3.0V, VIN = 0, VS3V257 50 mA VOUT = 1.5V VS3V2257 30 mA Switch I/O Drive Current (Logic HIGH) VCC = 3.0V, VIN = VCC, VS3V257 -20 mA VOUT = 1.5V VS3V2257 -10 Switch ON (1) Resistance /E = VCC VCC = 3.0V, VIN = 0, IOUT = 15mA VS3V257 IOUT = 8mA 7 Ω 28 (2) 40 Ω 10 (3) 14 Ω 35 (3) 48 Ω 5 VS3V2257 VCC = 2.3V, VIN = 0, mA 20 VS3V257 VS3V2257 23 (2) 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 QCCD Parameter Test Conditions Quiescent Power Supply Current VCC = Max, Power Supply Current per Input High (Control Inputs) VCC = 3.6V, VIN = 3.0V, f = 0 (2) Dynamic Power Supply Current (3) (1) S, /E = VCC or GND, f = 0 Max Units 1 µA 300 µA 0.15 mA/MHz VCC = 2.7V, VIN = 2.1V, f = 0 VCC = Max, Switch pins open, 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 Page 3 MDSS-0001-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 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 Vcc=2.7V Vcc=2.5V Vcc=2.3V VOUT VOUT (V) (V) 1 1 0 0 1 2 Figure 3. 3.3V to 2.5V Translation 2 VIN (V) 1 4 3 VIN (V) 3 Figure 4. 2.5V to 1.8V Translation (TA + 25 °C) (TA + 25 °C) VOH CHARACTERISTICS 3.0 3.0 2.0 2.0 VOH VOH (V) (V) 1.0 1.0 0 0 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Supply Voltage – VCC (V) (TA + 25 °C) Figure 5. VOH CHARACTERISTICS (Vcc = 3.3V nominal) 2000-11-28 3.7 2.2 2.3 2.4 2.5 2.6 2.7 Supply Voltage – VCC (V) (TA + 25 °C) Figure 6. VOH CHARACTERISTICS (Vcc = 2.5V nominal) Page 4 MDSS-0001-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 2.8 VS3V257/VS3V2257 Table 8. Switching Characteristics Over Operating Range – 3.3V Supply Voltage o o TA = -40 C to +85 C, VCC = 3.3V + 0.3V CLOAD = 30pF, RLOAD = 1kΩ unless otherwise stated. Symbol Description (2,3) (1) Min VS3V257 Max (3) tPLH, tPHL Data Propagation Delay tPZH, tPZL Switch Turn-on Delay, S to YX, I0X, or I1X 0.5 5.2 tPZH, tPZL Switch Turn-on Delay, /E to YX, I0X, or I1X 0.5 0.5 tPLZ, tPHZ Switch Turn-off Delay through the switch (3) , S or /E to YX, I0X, or I1X VS3V2257 (3) Min Max 0.25 Units 1.25 ns 0.5 6.2 ns 4.8 0.5 5.8 ns 5.0 0.5 5.0 ns Table 9. Switching Characteristics Over Operating Range – 2.5V Supply Voltage o o TA = -40 C to +85 C, VCC = 2.5V + 0.2V CLOAD = 30pF, RLOAD = 1kΩ unless otherwise stated. Symbol Description (1) Min VS3V257 Max (3) VS3V2257 (3) Min Max Units tPLH, tPHL Data Propagation Delay (2,3) through the switch ns tPZH, tPZL Switch Turn-on Delay, S to YX, I0X, or I1X ns tPZH, tPZL Switch Turn-on Delay, /E to YX, I0X, or I1X ns tPLZ, tPHZ Switch Turn-off Delay (3), S or /E to YX, I0X, or I1X 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 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. Figure 7. AC Test Circuit and Switching Waveforms AC Test Circuit 3.3V Supply Voltage Load Switch Position S1 TEST 5V R1 VIN Pulse Generator VOUT 1k Ω DUT 2000-11-28 Open tPLZ, tPZL 5V tPHZ, tPZH GND RL 950Ω 50Ω S1 tPLH, tPHL CL Input Conditions 50Ω=Coax to Oscilloscope Input voltage = 0 V to 3.0 V tr = tf = 2.5ns (10% to 90%) Page 5 MDSS-0001-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VS3V257/VS3V2257 Switching Waveforms 3.0 V Input 1.5 V 0V tPLH tPHL VOH Switch Output 1.2 V VOL Propagation Delay 3.0 V 1.5 V Control Input 0V tPZH tPHZ VOH 0.15V Switch Output (Switch Input = 3.0 V) 1.2 V 0V tPLZ tPZL Switch Output (Switch Input = 0 V) 0.15V Switch ON Switch OFF 2.5 V 1.2 V VOL Switch ON Enable and Disable Times Ordering Information Part Number VS3V257Q VS3V257QX VS3V2257Q VS3V2257QX 2000-11-28 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 -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C Page 6 MDSS-0001-01 www.vaishali.com Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063