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| 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 1 2109876543212109876543210987654321098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single-Supply SPST Analog Switches Features * 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 Description 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). For single-supply operation below 5V, PI5A317/318/319 are also recommended. Applications * * * * * * 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 NO1 COM1 IN2 GND 1 2 3 4 8 7 6 5 V+ IN1 COM2 NO2 NC1 COM1 IN2 GND 1 2 3 4 PS324 8 7 6 5 V+ IN1 COM2 NC2 NC1 COM1 IN2 GND 1 2 3 4 PS325 8 7 6 5 V+ IN1 COM2 NC2 Top View Top View Switches shown for logic "0" input Top View PS323 Logic 0 1 Switch O FF ON PS324 Logic 0 1 Switch ON O FF Logic 0 1 PS325 Switch 1 O FF ON Switch 2 ON O FF 1 PS8188C 10/24/02 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Absolute Maximum Ratings 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 Thermal Information Continuous Power Dissipation Plastic DIP (derate 6mW/ C above +70C) ...................... 500mW Narrow SO (derate 6mW/ C above +70C) ...................... 450mW MSOP (derate 4mW/ C above +70C) ............................ 330mW Storage Temperature ........................................ -65C to +150C Lead Temperature (soldering, 10s) .................................. +300C 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 Analog Switch Analog Signal Range (3 ) On- Resistance VA N A LO G RO N V+ = 4.5V, VN O or VN C = +3.5V IC O M = 1mA, VN O or VN C = +3V, IC O M = 1mA, V+ = 5V, V+ = 5V, IC O M = 1mA, or VN C = 1V, 2V, 3V 25 Full 25 Full 25 Full 25 Full 25 Full 25 Full -0.1 -5 -0.1 -5 -0.2 -10 -0 . 0 4 -0.01 -0.01 2 0 20 30 0.8 V+ 35 60 2 4 6 8 0.1 5 0.1 5 0.2 10 nA ohm V Symbol Conditions Te mp (C) M in(1 ) Typ(2 ) M ax(1 ) Units On- Resistance Match Between Channels (4 ) RO N On- Resisatance Flatness (5 ) RF LAT(O N ) IN O (O F F ) or IN C (O F F ) VN O NO or NC Off Leakage Current(6) V+ = 5.5V, VC O M = 1V, VN O or VN C = 4.5V V+ = 5.5V VC O M = 4.5V VN O or VN C = 1V V+ = 5.5V VC O M = 5V VN O or VN C = 5V COM Off Leakage Current (6 ) IC O M (O F F ) COM On Leakage Current (6 ) IC O M (O N ) 2 PS8188C 10/24/02 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Electrical Specifications - Single +5V Supply (continued) (V + = 5V 10%, GND = 0V, VINH =2.4V, VINL = 0.8V) Parame te r Logic Input Input Current with Input Voltage High Input Current with Input Voltage High Logic High Input Voltage Logic Low Input Voltage Dynamic Turn- On Time (3 ) tO N VNO or VNC = 3V, Figure 2 Turn- Off Time (3 ) Break- Before- Make Time Delay (3 ) Charge Injection (3 ) Off Isolation(7 ) Crosstalk NC or NO Off Capacitance COM Off Capacitance COM Off Capacitance Supply Power- Supply Range Positive Supply Current V+ I+ V+ = 5.5V, VIN = 0V or V+, all channels on or off Full 2.7 -1 16 1 V A tO F F tD Q OIRR XTA LK C (O F F ) CC O M (O F F ) C C O M (O N ) f =1MHz, Figure 8 P S 3 2 5 o nly, RL = 3 0 0 o hm, C L = 3 5 p F, F igure 3 C L = 1nF, VG E N = 0 V, RG E N = 0 o hm, F igure 4 RL = 5 0 0 o hm, C L = 5 p F, f =1MHz, F igure 5 RL = 5 0 0 o hm, C L = 5 p F, f =1MHz, F igure 6 f =1MHz, Figure 7 9 22 pF 25 25 25 Full 25 Full 2 30 60 25 50 5 1 -72 dB -85 9 5 pC 75 150 50 100 ns IIN H IIN L VIN H VIN L VIN = 2.4V, all others = 0.8V VIN = 2.4V, all others = 2.4V Full -0.5 -0.5 2.4 0.8 0.005 0.005 0.5 0.5 A Symbol Conditions Te mp (C) M in(1 ) Typ(2 ) M ax(1 ) Units V 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 +25C. 7. Off Isolation = 20log10 [ VCOM / (VNCor VNO) ]. See Figure 5. 3 PS8188C 10/24/02 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Electrical Specifications - Single +3.3V Supply (V+ = 3.3V 10%, GND = 0V, VINH = 2.4V, VINL = 0.8V) Parame te r Analog Switch Analog Signal Range(3 ) On- Resistance Dynamic Turn- On Time(3 ) tO N VNO or VNC = 1.5V, Figure 2 Turn- Off Time(3 ) Break- Before- Make Time Delay(3 ) Charge Injection(3 ) Supply Positive Supply Current I+ V+ = 3.6V, VIN = 0V or V+, all channels on or off Full -1 0.01 1 A tO F F tD Q PS325 only CL = 1nF, VG EN = 0V, RG EN = 0ohm, Figure 4 25 Full 25 Full 25 25 2 50 10 0 30 60 5 1 5 pC 125 250 75 150 ns VA N A LO G RO N V+ = 3V, IC O M = 1mA, VN O or VN C = 1.5V 25 Full 0 40 50 V+ 70 80 V ohm Symbol Conditions Te mp (C) M in(1 ) Typ(2 ) M a x( 1 ) Units Electrical Specifications - Single +12V Supply (V+ = 12V 10%, GND = 0V, VINH = 4V, VINL = 0.8V) Parame te r Analog Switch Analog Signal Range(3 ) O n- Resistance D ynamic Turn- O n Time(3 ) tO N VNO or VNC = 1.5V, Figure 2 Turn- O ff Time(3 ) Break- Before- Make Time Delay(3 ) Charge Injection(3 ) Supply Positive Supply Current I+ V+ = 13V, VIN = 0V or V+, all channels on or off Full -1 0.01 1 A tO F F tD Q PS325 only CL = 1nF, VG EN = 0V, RG EN = 0ohm, Figure 4 25 Full 25 Full 25 25 2 25 50 20 40 5 1 5 pC 50 100 40 75 ns VA N A LO G RO N V+ = 10.8V IC O M = 1mA, VN O or VN C = 10V 25 Full 0 15 20 V+ 25 40 V ohm Symbol Conditions Te mp (C) M in(1 ) Typ(2 ) M a x( 1 ) Units 4 PS8188C 10/24/02 Application Information 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. 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. Positive Supply 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Power-Supply Considerations 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. 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. V+ Leakage Current NO COM Vg V- Figure 1. Overvoltage Protection 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. 5 PS8188C 10/24/02 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Test Circuits/Timing Diagrams +5V V+ VCOM = 3V COM NO or NC RL 1kohm VOUT CL 35pF Switch Output 0V tON Logic +3V Input 0V 50% tr <20ns tf <20ns tOFF VOUT 90% 90% IN Logic Input GND CL INCLUDES FIXTURE AND STRAY CAPACITANCE RL VOUT = VCOM RL + RON ( ) LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE OPPOSITE LOGIC Figure 2. Switching Time V+ V+ +3V NC NO IN Logic Input GND RL 300 ohm Logic Input VOUT CL 35 pF Switch Output (VOUT) +3V 50% 0V 90% 0V tD 90% CLINCLUDES FIXTURE AND STRAY CAPACITANCE. Figure 3. Break-Before-Make Interval (PS325 only) +5V V+ COM NO or NC CL IN Logic Input GND 1nF RGEN VGEN VOUT VOUT IN OFF ON ON VOUT OFF IN OFF OFF Q = (VOUT)(CL) IN POLARITY DEPENDS ON NO OR NC SWITCH FUNCTION Figure 4. Charge Injection 6 PS8188C 10/24/02 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Test Circuits/Timing Diagrams (continued) 10nF +5V 10nF Signal Generator 0dBm +5V V+ COM IN COM Analyzer RL NC or NO GND 0V or 2.4V COM1 V+ N01 50ohm 0V or 3.5V COM Analyzer RL IN1 IN2 0V or 2.4V N02 GND COM2 50ohm NC Figure 5. Off Isolation +5V Figure 6. Crosstalk +5V 10nF 10nF V+ COM Capacitance Meter f = 1MHz IN NC or NO GND 0V or 2.4V Capacitance Meter f = 1MHz COM V+ IN NC or NO GND 0V or 2.4V Figure 7. Channel-Off Capacitance Ordering Information Part PS323CPA P S 323C S A PS323CUAX PS323EPA PS323ESA PS323EUAX PS324CPA P S 324C S A PS324CUAX 0C to +70C -40C to +85C 0C to +70C Te mp. Range Package 8 Plastic DIP 8 Narrow SO 8 MSOP 8 Plastic DIP 8 Narrow SO 8 MSOP 8 Plastic DIP 8 Narrow SO 8 MSOP Figure 8. Channel-On Capacitance Part PS324EPA PS324ESA PS324EUAX PS325CPA P S 325C S A PS325CUAX PS325EPA PS325ESA PS325EUAX Te mp. Range Package 8 Plastic DIP -40C to +85C 8 Narrow SO 8 MSOP 8 Plastic DIP 0C to +70C 8 Narrow SO 8 MSOP 8 Plastic DIP -40C to +85C 8 Narrow SO 8 MSOP 7 PS8188C 10/24/02 RON (Ohm) 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches Typical Performance Curves (TA = 25C unless otherwise noted) Figure 9. On Resistance vs. Supply Voltage 70.0 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 RON (Ohm) RON (Ohm) 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 40.0 32.0 24.0 8.0 16.0 20.0 16.0 12.0 8.0 0 4.0 Figure 12. On Resistance vs. Switch Voltage, VCC = 12V 0 0 Figure 11. On Resistance vs. Switch Voltage, VCC = 5V 0 1.0V 2.4V 2.0V 3.0V VIN (V) 7.2V 4.8V VIN (V) 9 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 9.6V 4.0V 12V 5.0V PS8188C 10/24/02 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 PS323/PS324/PS325 Precision, Single Supply SPST Analog Switches 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 |
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