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Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 10

Technical content

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

Applications

  • Audio Switching and Routing
  • Portable Instruments
  • Data Acquisition Systems
  • Sample-and-Holds
  • Telecommunication Systems
  • Battery-Powered Systems

Description

The PS323/PS324/PS325 are improved high-precision, medium- voltage 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. 323SP cigoLh ctiwS FFO NO Switches shown for logic “0” input Top View 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1 2345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012 12345678901 2 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 PS323/PS324/PS325 Precision, Single-Supply SPST Analog Switches Functional Diagrams, Pin Configurations, and Truth Tables Top ViewTop View NC1 C OM1 IN2 GND COM 2 NC2 IN1 PS324 NC1 COM1 IN2 GND COM2 NC2 IN1 PS325 NO1 C OM1 IN2 GND COM 2 NO2 IN1 PS323 423SP cigoLh ctiwS NO FFO 523SP cigoLh ctiwS1 h ctiwS2 FFO NO NO FFO

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2 PS8188C 10/24/02

Precision, Single Supply SPST Analog Switches Absolute Maximum Ratings Caution: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress onl y 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) Thermal Information Continuous Power Dissipation 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. V or 30mA, whichever occurs first Peak Current, COM, NO, NC retemaraPl obmySs noitidnoC) C°(pmeTn iM )1( pyT )2( xaM )1( stinU hctiwSgolanA egnaRlangiSgolanA )3( V GOLANA 0+ VV ecnatsiseR-nOR NO ,V5.4=+V V ON Vro CN V5.3+= I MOC ,Am1= 520 25 3 mho lluF0 30 6 hctaMecnatsiseR-nO slennahCneewteB )4( R NO V ON Vro CN ,V3+= I MOC ,Am1= ,V5=+V 528 .02 lluF4 ssentalFecnatasiseR-nO )5( R )NO(TALF ,V5=+V I MOC ,Am1= V ON Vro CN V3,V2,V1= 522 6 lluF8 egakaeLffOCNroON )6(tnerruC I (ON) FFO ro I )FFO(CN ,V5.5=+V V MOC ,V1= V ON Vro CN V5.4= 521 .0–1 0.0–1 .0 An lluF5 –5 tnerruCegakaeLffOMOC )6( I )FFO(MOC V5.5=+V V MOC V5.4= V ON Vro CN V1= 521 .0–1 0.0–1 .0 lluF5 –5 tnerruCegakaeLnOMOC )6( I )NO(MOC V5.5=+V V MOC V5= V ON Vro CN V5= 522 .0–4 0.0–2 .0 lluF0 1–0 1

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3 PS8188C 10/24/02

Precision, Single Supply SPST Analog Switches Electrical Specifications - Single +5V Supply (continued) (V + = 5V ±10%, GND = 0V, VINH =2.4V, VINL = 0.8V) 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. ∆R ON = 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 = 20log 10 [ VCOM / (VNCor VNO) ]. See Figure 5. retemaraPl obmySs noitidnoC) C°(pmeTn iM )1( pyT )2( xaM )1( stinU tupnIcigoL Aµ egatloVtupnIhgiHcigoLV HNI 4.2 V egatloVtupnIwoLcigoLV LNI 8.0 cimanyD emiTnO-nruT )3( t NO VNO roV NC 2erugiF,V3= 520 35 7 sn lluF0 60 51 emiTffO-nruT )3( t FFO 525 20 5 lluF0 50 01 yaleDemiTekaM-erofeB-kaerB )3( tD ,Fp53=LC,mho003=LR,ylno523SP 3erugiF 5252 noitcejnIegrahC )3( Q CL V,Fn1= NEG ,V0= R NEG = 0mho4 erugiF, 15C p noitalosIffO )7( RRIOR L C,mho005= L 5erugiF,zHM1=f,Fp5=2 7– Bd klatssorCX KLAT RL C,mho005= L 6erugiF,zHM1=f,Fp5=5 8– ecnaticapaCffOONroCNC )FFO( 7erugiF,zHM1=f FpecnaticapaCffOMOCC )FFO(MOC 9 ecnaticapaCffOMOCC )NO(MOC 8erugiF,zHM1=f2 2 ylppuS egnaRylppuS-rewoP+ V7 .26 1V tnerruCylppuSevitisoP+ I V,V5.5=+V NI ,+VroV0= fforonoslennahclla lluF1 –1 µ A

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4 PS8188C 10/24/02

Precision, Single Supply SPST Analog Switches Electrical Specifications - Single +3.3V Supply (V+ = 3.3V ±10%, GND = 0V, VINH = 2.4V, VINL = 0.8V) retemaraPl obmySs noitidnoC) C°(pmeTn iM )1( pyT )2( xaM )1( stinU hctiwSgolanA SgolanAl angie gnaR )3( V GOLANA 0+ VV ecnatsiseR-nOR NO ,V3=+V I MOC ,Am1= V ON Vro CN V5.1= 520 40 7m ho lluF0 50 8 cimanyD emiTnO-nruT )3( t NO VNO roV NC 2erugiF,V5.1= 520 55 21 sn lluF0 010 52 emiTffO-nruT )3( t FFO 520 35 7 lluF0 60 51 yaleDemiTekaM-erofeB-kaerB )3( tD ylno523SP5 22 5 noitcejnIegrahC )3( Q CL V,Fn1= NEG ,V0= R NEG = 0mho4 erugiF, 521 5 C p ylppuS tnerruCylppuSevitisoP+ IV ,V6.3=+V NI ,+VroV0= fforonoslennahclla lluF1 –1 0.01 Aµ Electrical Specifications - Single +12V Supply (V+ = 12V ±10%, GND = 0V, VINH = 4V, VINL = 0.8V) retemaraPl obmySs noitidnoC) C°(pmeTn iM )1( pyT )2( xaM )1( stinU hctiwSgolanA SgolanAl angie gnaR )3( V GOLANA 0+ VV ecnatsiseR-nOR NO V8.01=+V I MOC ,Am1= V ON Vro CN V01= 525 15 2m ho lluF0 20 4 cimanyD emiTnO-nruT )3( t NO VNO roV NC 2erugiF,V5.1= 525 20 5 sn lluF0 50 01 emiTffO-nruT )3( t FFO 520 20 4 lluF0 45 7 yaleDemiTekaM-erofeB-kaerB )3( tD ylno523SP5 22 5 noitcejnIegrahC )3( Q CL V,Fn1= NEG ,V0= R NEG = 0mho4 erugiF, 521 5 C p ylppuS tnerruCylppuSevitisoP+ IV ,V31=+V NI ,+VroV0= fforonoslennahclla lluF1 –1 0.01 Aµ

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5 PS8188C 10/24/02

Precision, Single Supply SPST Analog Switches

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 COMNO Vg Figure 1. Overvoltage Protection GND pin) to V+ does not exceed a total of 12V . to V+ with a fast transition time minimizes power dissipation. In 50Ohm systems, signal response is flat even past 300MHz. divider action of the switch OFF impedance and the load. conducts if any analog signal exceeds V+ or GND. is no connection between the analog-signal paths and V+ or GND.

6 PS8188C 10/24/02

Figure 2. Switching Time Figure 3. Break-Before-Make Interval (PS325 only) Figure 4. Charge Injection

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7 PS8188C 10/24/02

Precision, Single Supply SPST Analog Switches Test Circuits/Timing Diagrams (continued) Figure 5. Off Isolation Figure 7. Channel-Off Capacitance Figure 6. Crosstalk Figure 8. Channel-On Capacitance

Ordering Information

traPe gnaR.pmeTe gakcaP APC323SP Cº07+otCº0 PIDcitsalP8 ASC323SPO SworraN8 XAUC323SP8 P OSM APE323SP Cº58+otCº04– PIDcitsalP8 ASE323SPO SworraN8 XAUE323SPP OSM8 APC423SP Cº07+otCº0 PIDcitsalP8 ASC423SPO SworraN8 XAUC423SP8 P OSM Ω traPe gnaR.pmeTe gakcaP APE423SP Cº58+otCº04– PIDcitsalP8 ASE423SPO SworraN8 XAUE423SPP OSM8 APC523SP Cº07+otCº0 PIDcitsalP8 ASC523SPO SworraN8 XAUC523SPP OSM8 APE523SP Cº58+otCº04– PIDcitsalP8 ASE523SPO SworraN8 XAUE523SPP OSM8

8 PS8188C 10/24/02

Figure 9. On Resistance vs. Supply Voltage Figure 10. On Resistance vs. Switch Voltage, VCC = 3.3V

9 PS8188C 10/24/02

Figure 11. On Resistance vs. Switch Voltage, VCC = 5V Figure 12. On Resistance vs. Switch Voltage, VCC = 12V

10 PS8188C 10/24/02

Figure 13. Charge Injection vs. Switch Voltage Figure 14. Digital Switching point vs. Supply Voltage