PS323/PS324/PS325 Precision, Single-Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Features Description • Low On-Resistance (33-Ohm typ.) Minimizes Distortion and Error Voltages • Low Glitching Reduces Step Errors in Sample-and-Holds. Charge Injection, 2pC typ. • Single-Supply Operation (+2.5V to +16V) •· Improved Second Sources for MAX323/MAX324/MAX325 • On-Resistance Matching Between Channels, <2-Ohm • On-Resistance Flatness, <6-Ohm max. • Low Off-Channel Leakage, <5nA @ +85oC • TTL/CMOS Logic Compatible • Fast Switching Speed, tON <150ns • Guaranteed Break-Before-Make action (PS325 only) eliminates momentary crosstalk v Rail-to-Rail Analog Signal Dynamic Range • Low Power Consumption, <5mW • MSOP Package Minimizes Board Area The PS323/PS324/PS325 are improved high-precision, mediumvoltage analog switches designed to operate with single power supplies. The PS323 is a dual, single-pole single-throw (SPST), normally open (NO) switch. The PS324 has the same pinout as the PS323 but it has two normally closed (NC) switches. The PS325 has one normally open (NO) and one normally closed (NC) switch per package. Each switch conducts current equally well in either direction when on. In the off state, each switch blocks voltages up to the power-supply rail. With a +5V power supply, PS323/PS324/PS325 guarantee <60-ohm ON-resistance. ON-resistance matching between channels is within 2W. ON-resistance flatness is less than 6W over the specified range. All three devices guarantee low leakage currents (<100 pA @ 25oC, <10nA @ +85oC) and fast switching speeds (tON <150ns). Break-before-make switching action protects against momentary crosstalk (PS325). Applications • • • • • • For single-supply operation below 5V, PI5A317/318/319 are also recommended. Audio Switching and Routing Portable Instruments Data Acquisition Systems Sample-and-Holds Telecommunication Systems Battery-Powered Systems Functional Diagrams, Pin Configurations, and Truth Tables PS323 PS325 PS324 NO1 1 8 V+ COM1 2 7 IN1 IN2 3 6 COM2 GND 4 5 NO2 NC1 1 8 V+ COM1 2 7 IN1 IN2 3 6 COM2 GND 4 5 NC2 Top View NC1 1 8 V+ COM1 2 7 IN1 IN2 3 6 COM2 GND 4 5 NC2 Top View Top View Switches shown for logic “0” input PS323 PS325 PS324 Logic Switch Logic Switch Logic Switch 1 Switch 2 0 1 O FF ON 0 1 ON O FF 0 1 O FF ON ON O FF 1 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Absolute Maximum Ratings Thermal Information Voltages Referenced to GND ....................................................... V+ ........................................................................... -0.3V to +17V VIN, VCOM, VNC, VNO (1) ................................................ –2V to (V+) +2V or 30mA, whichever occurs first Current (any terminal) ........................................................ 30mA Peak Current, COM, NO, NC (pulsed at 1ms, 10% duty cycle) ....................................... 100mA ESD per Method 3015.7 ................................................... >2000V Continuous Power Dissipation Plastic DIP (derate 6mW/ ºC above +70ºC) ...................... 500mW Narrow SO (derate 6mW/ ºC above +70ºC) ...................... 450mW MSOP (derate 4mW/ ºC above +70ºC) ............................ 330mW Storage Temperature ........................................ –65ºC to +150ºC Lead Temperature (soldering, 10s) .................................. +300ºC Note 1: Signals on NC, NO, COM, or IN exceeding V+ or GND are clamped by internal diodes. Limit forward diode current to 30mA maximum. Caution: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Electrical Specifications - Single +5V Supply (V+ = 5V +10%, GND = 0V, VINH = 2.4V, VINL = 0.8V) Parame te r Symbol Conditions Te mp (°C) M in(1 ) Typ(2 ) M ax(1 ) Units V+ V Analog Switch Analog Signal Range (3 ) On- Resistance On- Resistance Match Between Channels (4 ) On- Resisatance Flatness (5 ) VA N A LO G 0 RO N V+ = 4.5V, VN O or VN C = +3.5V IC O M = 1mA, ∆RO N VN O or VN C = +3V, IC O M = 1mA, V+ = 5V, RF LAT(O N ) VN O V+ = 5V, IC O M = 1mA, or VN C = 1V, 2V, 3V NO or NC Off Leakage Current(6) IN O (O F F ) or IN C (O F F ) V+ = 5.5V, VC O M = 1V, VN O or VN C = 4.5V COM Off Leakage Current (6 ) IC O M (O F F ) V+ = 5.5V VC O M = 4.5V VN O or VN C = 1V IC O M (O N ) V+ = 5.5V VC O M = 5V VN O or VN C = 5V COM On Leakage Current (6 ) 2 25 20 35 Full 30 60 25 0.8 2 Full ohm 4 25 2 Full 6 8 25 –0.1 Full –5 25 –0.1 Full –5 25 –0.2 Full –10 –0.01 0.1 5 –0.01 0.1 5 –0 . 0 4 nA 0.2 10 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Electrical Specifications - Single +5V Supply (continued) (V + = 5V ±10%, GND = 0V, VINH =2.4V, VINL = 0.8V) Parame te r Symbol Conditions Te mp (°C) M in(1 ) Typ(2 ) M ax(1 ) Input Current with Input Voltage High IIN H VIN = 2.4V, all others = 0.8V Full –0.5 0.005 0.5 Input Current with Input Voltage High IIN L VIN = 2.4V, all others = 2.4V –0.5 0.005 0.5 Logic High Input Voltage VIN H Logic Low Input Voltage VIN L Units Logic Input 2.4 0.8 µA V Dynamic Turn- On Time (3 ) tO N VNO or VNC = 3V, Figure 2 Turn- Off Time (3 ) tO F F Break- Before- Make Time Delay (3 ) tD P S 3 2 5 o nly, RL = 3 0 0 o hm, C L = 3 5 p F, F igure 3 Charge Injection (3 ) Q C L = 1nF, VG E N = 0 V, RG E N = 0 o hm, F igure 4 OIRR RL = 5 0 0 o hm, C L = 5 p F, f =1MHz, F igure 5 Off Isolation(7 ) Crosstalk XTA LK NC or NO Off Capacitance C (O F F ) COM Off Capacitance CC O M (O F F ) COM Off Capacitance C C O M (O N ) RL = 5 0 0 o hm, C L = 5 p F, f =1MHz, F igure 6 25 30 75 Full 60 150 25 25 50 Full 50 100 2 ns 5 1 5 pC –72 dB 25 25 –85 9 f =1MHz, Figure 7 9 f =1MHz, Figure 8 pF 22 Supply Power- Supply Range V+ Positive Supply Current I+ V+ = 5.5V, VIN = 0V or V+, all channels on or off Full 2.7 16 V –1 1 µA Notes: 1. The algebraic convention, where the most negative value is a minimum and the most positive is a maximum, is used in this data sheet. 2. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing. 3. Guaranteed by design 4. ∆RON = RON max - RON min 5. Flatness is defined as the difference between the maximum and minimum value of ON-resistance measured. 6. Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25ºC. 7. Off Isolation = 20log10 [ VCOM / (VNCor VNO) ]. See Figure 5. 3 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Electrical Specifications - Single +3.3V Supply (V+ = 3.3V ±10%, GND = 0V, VINH = 2.4V, VINL = 0.8V) Parame te r Symbol Conditions Te mp (°C) M in(1 ) Typ(2 ) M a x( 1 ) Units V+ V ohm Analog Switch Analog Signal Range(3 ) On- Resistance VA N A LO G 0 V+ = 3V, IC O M = 1mA, VN O or VN C = 1.5V RO N 25 40 70 Full 50 80 25 50 125 Full 10 0 250 25 30 75 Full 60 150 Dynamic Turn- On Time(3 ) tO N VNO or VNC = 1.5V, Figure 2 Turn- Off Time(3 ) tO F F Break- Before- Make Time Delay(3 ) tD PS325 only 25 Charge Injection(3 ) Q CL = 1nF, VG EN = 0V, RG EN = 0ohm, Figure 4 25 2 ns 5 1 5 pC Supply Positive Supply Current I+ V+ = 3.6V, VIN = 0V or V+, all channels on or off Full –1 0.01 1 Te mp (°C) M in(1 ) Typ(2 ) M a x( 1 ) Units V+ V ohm µA Electrical Specifications - Single +12V Supply (V+ = 12V ±10%, GND = 0V, VINH = 4V, VINL = 0.8V) Parame te r Symbol Conditions Analog Switch Analog Signal Range(3 ) O n- Resistance VA N A LO G RO N 0 V+ = 10.8V IC O M = 1mA, VN O or VN C = 10V 25 15 25 Full 20 40 25 25 50 Full 50 100 25 20 40 Full 40 75 D ynamic Turn- O n Time(3 ) tO N VNO or VNC = 1.5V, Figure 2 Turn- O ff Time(3 ) tO F F Break- Before- Make Time Delay(3 ) tD PS325 only 25 Charge Injection(3 ) Q CL = 1nF, VG EN = 0V, RG EN = 0ohm, Figure 4 25 2 ns 5 1 5 0.01 1 pC Supply Positive Supply Current I+ V+ = 13V, VIN = 0V or V+, all channels on or off 4 Full –1 PS8188C µA 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Application Information Power-Supply Considerations The PS323, PS324, & PS325 dual analog switches precisely switch inputs with a single 2.7V to 12V supply, low on-resistance (30Ohm) and high speed operation (tON = 85ns, tOFF = 25ns). The devices are suited to portable battery powered equipment due to a low supply voltage (2.7V), low power consumption (5mW), and low leakage currents (0.1nA). High frequency applications benefit from the high bandwidth, high off isolation, and low crosstalk. The PS32X construction is typical of most CMOS analog switches, except that they have voltage supply pins: V+ and GND. These pins power the internal CMOS switches and set the analog voltage limits. Unlike switches with a 12V maximum supply voltage, the PS32X series is made from a 17V-supply voltage technology that provides room for 10-20% tolerance on 12V supplies. This technology gives room for overshoot and noise spikes. While the minimum recommended supply voltage is 2.7V, it is important to note that the input signal-range, switching times, and on-resistance degrade at lower supply voltages. Refer to the electrical specifications for details. V+ and GND also power the internal logic drivers (turn the switch on & off). These switches can be operated with bipolar supplies if the voltage range from V- (at the GND pin) to V+ does not exceed a total of 12V. Proper Power Supply Sequencing & Over-voltage Protection With any CMOS device, proper power supply sequencing is needed to protect the device from excessive input currents, which may permanently damage the IC. All I/O pins contain ESD protection diodes from the pin to V+ and to GND (see Figure 9 below). To prevent forward biasing of these diodes, V+ must be applied before any input signals, and input signals must swing between V+ and GND. If these conditions cannot be guaranteed, then one of two suggested protection methods must be employed. Protect the logic inputs by adding a 1kOhm resistor in series with the input (see Figure 9). The resistor limits the currents below the threshold that can cause permanent damage to sub-micro Amp levels. This reduced input current produces an insignificant voltage drop during normal operation. A series resistor is not desirable, but small-signal diodes can be added in series with the supply pins to provide over-voltage protection for the IC. The diodes limit the analog signal from 1V below V+ to 1V above GND. The leakage current will remain low, but the switch resistance may increase at low supply voltages. Logic-Level Thresholds The switch logic is TTL compatible (0.8V & 2.4V) over a supply range of 3V to 11V. At 12V the VIH level is about 2.5V. This is below the TTL guaranteed high output minimum level of 2.8V, but noise margin is reduced. For best results with a 12V supply, use logic drive that provides a VOH greater than 3V. The digital input stages draw supply current whenever the digital input voltage is not at one of the supply rails. Driving the digital input signals from GND to V+ with a fast transition time minimizes power dissipation. High-Frequency Signal Passing/Isolation In 50Ohm systems, signal response is flat even past 300MHz. An OFF switch is like a capacitor and passes high frequencies with low attenuation, resulting in signal passing from the switch input to output. OFF Isolation is the resistance to passing signals while the switch is OFF, while Crosstalk indicates the amount of signal noise that crosses over from one switch to another. The OFF Isolation is about 50dB in 50Ohm systems. Larger load impedances reduce Off Isolation and Crosstalk due to the voltage divider action of the switch OFF impedance and the load. Positive Supply V+ Leakage Current NO Reverse ESD protection diodes are internally connected between each analog-signal pin and both V+ and GND. One of these diodes conducts if any analog signal exceeds V+ or GND. Most of the analog leakage current comes from the ESD diodes to V+ or GND. Although the ESD diodes on a given signal pin are identical and therefore fairly well balanced, they are reverse biased differently. Either V+ or GND and the analog signal bias each diode. Hence, leakage currents will vary as the signal varies. The difference in the diode leakage currents to the V+ and GND pins creates the analog signal-path leakage current. Also, analog leakage currents flow between each pin and one of the supply terminals, not to the other switch terminal. This is why both sides of a given switch can show leakage currents of the same or opposite polarity. There is no connection between the analog-signal paths and V+ or GND. COM Vg V- Figure 1. Overvoltage Protection 5 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Test Circuits/Timing Diagrams +5V V+ NO or NC COM VCOM = 3V VOUT RL 1kohm IN Logic Input Logic +3V Input 0V tr <20ns tf <20ns 50% tOFF CL 35pF Switch Output GND VOUT 90% 90% 0V tON LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE OPPOSITE LOGIC CL INCLUDES FIXTURE AND STRAY CAPACITANCE RL VOUT = VCOM RL + RON ( ) Figure 2. Switching Time V+ Logic Input V+ NC +3V VOUT NO RL 300Ω IN ohm Logic Input +3V 50% 0V CL 35 pF GND Switch Output (VOUT) CLINCLUDES FIXTURE AND STRAY CAPACITANCE. 90% 90% 0V tD Figure 3. Break-Before-Make Interval (PS325 only) +5V RGEN V+ VGEN VOUT IN CL OFF OFF ON 1nF IN Logic Input ∆VOUT VOUT NO or NC COM GND IN OFF ON OFF Q = (∆VOUT)(CL) IN POLARITY DEPENDS ON NO OR NC SWITCH FUNCTION Figure 4. Charge Injection 6 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Test Circuits/Timing Diagrams (continued) 10nF +5V 10nF Signal Generator 0dBm V+ +5V COM1 V+ IN COM Analyzer 0V or 2.4V NC or NO COM Analyzer GND RL Ω RL COM2 N02 +5V 10nF +5V V+ V+ IN NC or NO f = 1MHz NC GND Figure 6. Crosstalk COM Capacitance Meter 0V or 2.4V 50ohm Figure 5. Off Isolation 10nF IN2 IN1 0V or 3.5V 50ohm N01 COM Capacitance Meter 0V or 2.4V f = 1MHz COM IN 0V or 2.4V NC or NO GND GND Figure 7. Channel-Off Capacitance Figure 8. Channel-On Capacitance Ordering Information Part Te mp. Range PS323CPA P S 323C S A 0ºC to +70ºC Part Package 8 Plastic DIP PS324EPA 8 Narrow SO PS324ESA 8 MSOP PS323EPA 8 Plastic DIP PS325CPA 8 Narrow SO P S 325C S A –40ºC to +85ºC 8 MSOP PS324CPA 8 Plastic DIP PS325EPA 8 Narrow SO PS325ESA P S 324C S A PS324CUAX 0ºC to +70ºC –40ºC to +85ºC 8 MSOP PS325EUAX 7 8 Narrow SO 8 MSOP 8 Plastic DIP 0ºC to +70ºC PS325CUAX PS323EUAX Package 8 Plastic DIP PS324EUAX PS323CUAX PS323ESA Te mp. Range 8 Narrow SO 8 MSOP 8 Plastic DIP –40ºC to +85ºC 8 Narrow SO 8 MSOP PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Typical Performance Curves (TA = 25°C unless otherwise noted) Figure 9. On Resistance vs. Supply Voltage 70.0 RON (Ohm) 56.0 42.0 28.0 14.0 0 0 0.6V 1.2V 1.8V VIN (V) 2.4V 3.0V Figure 10. On Resistance vs. Switch Voltage, VCC = 3.3V 8 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 40.0 24.0 16.0 8.0 0 0 1.0V 2.0V 3.0V VIN (V) 4.0V 5.0V Figure 11. On Resistance vs. Switch Voltage, VCC = 5V 20.0 16.0 RON (Ohm) RON (Ohm) 32.0 12.0 8.0 4.0 0 0 2.4V 7.2V 4.8V VIN (V) 9.6V 12V Figure 12. On Resistance vs. Switch Voltage, VCC = 12V 9 PS8188C 10/24/02 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Figure 13. Charge Injection vs. Switch Voltage Figure 14. Digital Switching point vs. Supply Voltage Pericom Semiconductor Corporation 2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com 10 PS8188C 10/24/02