LTC221/LTC222 Micropower, Low Charge Injection, Quad CMOS Analog Switches with Data Latches DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LTC®221 and LTC222 are micropower, quad CMOS analog switches which typically dissipate only 250µW from ±15V supplies and 40µW from a single 5V supply. Onboard latches allow the LTC221 and LTC222 to interface directly to most microprocessor buses. The switches have 65Ω typical on resistance and a very high off resistance. A break before make characteristic is inherent in these switches to prevent the shorting of two channels. The signal range is ±15V with a supply voltage of ±15V and 0V to 5V with a single 5V supply. The switches have special charge compensation circuitry which greatly reduces charge injection to a maximum of ±25pC (±15V supplies). Micropower Operation Single 5V or ±15V Supply Operation Low Charge Injection Low RON Low Leakage Guaranteed Break Before Make Latch Resistant Design TLL/CMOS Compatible Improved Second Source for DG221/DG222 Microprocessor Bus Compatible U KEY SPECIFICATIO S ■ ■ ■ ■ Supply Current ..................... I+ = 40µA, I – = 5µA Max Charge Injection ±15V Supplies ................................. ±25pC Max Single 5V Supply .................................. 2pC Typ RON ............................................................... 65ΩTyp Signal Range ..................................................... ±15V The LTC221 and LTC222 are designed for applications such as microprocessor controlled programmable gain amplifiers, automatic test equipment, communication systems, and data acquisition systems. The LTC221 is normally closed and the LTC222 is normally open as shown in the Logic Table. , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO Two-Channel, 12-Bit, Self Calibrating Data Acquisition System LTC221/LTC222 WR WR 5V V+ IN4 GND IN3 V– IN2 LOGIC DECODER ADDRESS BUS DATA BUS B0 – B3 IN1 VFS S1 D1 S2 D2 TO MICROPROCESSOR e.g. TMS320C25 15V 5V + VIN OV TO 5V 10k IN LT1006 S3 D3 S4 D4 – LTC1292 CLK 12-BIT ADC DOUT SERIAL PORT CS 150k –IN R1 VREF 100k GND 120Ω 270Ω –15V LT1027 VFS 15V LTC221/222 • TA01 2212fa 1 LTC221/LTC222 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) Voltages Referenced to V – V+ ........................................................................................... 44V GND ..................................................................... 25V Digital Inputs, S, D (Note 2) .......... – 2V to (V + 2V) or Digital Inputs, S, D (N2020mA, Whichever Occurs First Current Any Input Except S or D ................................... 30mA Continuous S or D ............................................ 20mA Peak S or D (Pulsed at 1 ms, 10% Duty Cycle Max) ......... 70mA ESD Susceptibility (Note 3) ...................................... 4kV Power Dissipation (Plastic) ............................... 500mW Power Dissipation (Ceramic) ............................. 900mW Operating Temperature Range LTC221C/LTC222C .................................. 0°C to 70°C LTC221M/LTC222M (OBSOLETE).......–55°C to 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C TOP VIEW IN1 1 16 IN2 D1 2 15 D2 S1 3 14 S2 V– 4 13 V + ORDER PART NUMBER LTC221CN LTC221CS LTC222CN LTC222CS 12 WR GND 5 S4 6 11 S3 D4 7 10 D3 IN4 8 9 N PACKAGE 16-LEAD PDIP JMAX = 110°C, θJA = 120°C/W IN3 S PACKAGE 16-LEAD PLASTIC SO JMAX = 110°C, θJA = 130°C/W LTC221MJ LTC221CJ LTC222MJ LTC222CJ J PACKAGE 16-LEAD CERDIP OBSOLETE PACKAGE Consider the N or S Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. LOGIC TABLE INX WR LTC221 LTC222 0 0 On Off 1 0 Off On X 1 Maintain Previous State Maintain Previous State U DIGITAL A D DC ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply + – over full operating temperature range, otherwise specifications are at TA = 25°C. V = ±15V, V = –15V, GND = 0V, unless noted. PARAMETER Analog Signal Range RON Off Input Leakage IS (OFF) CONDITIONS LTC221M/LTC222M MIN TYP MAX LTC221C/LTC222C MIN TYP MAX ±15 90 90 135 ±1 ±100 ±1 ±100 ±1 ±200 ±15 90 90 135 ±5 ±100 ±5 ±100 ±5 ±200 ● VS = ±10V ID = 1mA TMIN 25°C TMAX VD = 14V, VS = ±14V 65 0.01 ● Off Output Leakage ID (0FF) On Channel Leakage lD (ON) Input High Voltage VINH, VWRH Input Low Voltage VINL, VWRL Input High or Low Current IINH, IINL, IWRH, IWRL CS (OFF) CD (OFF) CD, CS (ON) I+ VIN = 2.4V, LTC221 VIN = 0.8V, LTC222 VD = VS = ±14V, VIN = 2.4V, LTC222 VIN = 0.8V, LTC221 0.01 ● 0.02 ● ● 2.4 All Channels On or Off VIN = VWR = 0V or 4.0V 0.01 0.02 0.8 ±1 ● 5 12 30 16 ● 0.01 0.8 ±1 V Ω Ω Ω nA nA nA nA nA nA V V µA 40 60 pF pF pF µA µA 2.4 ● VIN = 15V, 0V VWR = 15V, 0V 65 40 60 5 12 30 16 UNITS 2212fa 2 LTC221/LTC222 U DIGITAL A D DC ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply + – over full operating temperature range, otherwise specifications are at TA = 25°C. V = ±15V, V = –15V, GND = 0V, unless noted. PARAMETER CONDITIONS LTC221M/LTC222M MIN TYP MAX LTC221C/LTC222C MIN TYP MAX 0.1 0.1 I– ● 5 10 5 10 UNITS µA AC ELECTRICAL CHARACTERISTICS V + = 15V, V – = –15V, GND = 0V, unless otherwise noted. PARAMETER CONDITIONS tON VS = 2V, RL = 1kΩ, CL = 35pF LTC221M/LTC222M MIN TYP MAX LTC221C/LTC222C MIN TYP MAX 290 400 290 400 210 300 210 300 tOFF tOPEN Off Isolation 20 85 20 ns 85 ns 75 dB VS = 2Vp-p, RL = 1kΩ 75 Crosstalk f = 100kHz 90 Charge Injection OINJ RGEN = 0Ω, CL = 1000pF, VGEN = 0 5 Total Harmonic Distortion THD VS = 2Vp-p, RL = 10kΩ 0.01 tON, WR VS = 2V, RL = 1kΩ, CL = 35pF 270 400 270 400 160 300 160 300 tOFF, WR UNITS 90 8 ±25 ±25 0.01 pC % ns U DIGITAL A D DC ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply + – over full operating temperature range, otherwise specifications are at TA = 25°C. V = 5V, V = GND = 0V, unless noted. PARAMETER LTC221M/LTC222M MIN TYP MAX CONDITIONS Analog Signal Range RON ● VS = 1.5V, 3V TMIN ID = 0.25mA 25°C 0 5 0.01 ● 0.01 ● 0.01 ±1 0.01 ±1 ±100 VD = VS = 1V, 4V (Note 4) 280 ±100 Off Output Leakage ID (0FF) On Channel Leakage lD (ON) 450 650 VD = 4V, 1V; VS = 1V, 4V (Note 4) 0 450 280 TMAX Off Input Leakage IS (OFF) LTC221C/LTC222C MIN TYP MAX 0.01 ● 0.01 ±1 ±200 5 V 520 Ω 520 Ω 650 Ω ±5 nA ±100 nA ±5 nA ±100 nA ±5 nA ±200 nA Input High Voltage VINH, VWRH ● Input Low Voltage VINL, VWRL ● 0.8 0.8 V ● ±1 ±1 µA Input High or Low Current IINH, IINL, IWRH, IWRL VIN = 5V, 0V VWR = 5V, 0V CS(OFF) 2.4 UNITS 2.4 5 V 5 pF CD (OFF) 12 12 pF CD, CS (ON) 30 30 pF I+ All Channels On or Off VIN = VWR = 0V or 4.0V 8 ● 20 30 8 20 µA 30 µA 2212fa 3 LTC221/LTC222 AC ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS tON VS = 2V, RL = 1kΩ, CL = 35pF V + = 5V, V – = GND = 0V, unless otherwise noted. LTC221M/LTC222M MIN TYP MAX LTC221C/LTC222C MIN TYP MAX 450 600 450 600 ns 190 300 190 300 ns tOFF tOPEN 100 250 250 ns Off Isolation VS = 2VP-P, RL = 1kΩ 75 75 dB Crosstalk f = 100kHz 90 90 dB Charge Injection OINJ RGEN = 0Ω, CL = 1000pF, VGEN = 2.5V 2 2 pC Total Harmonic Distortion THD VS = 2VP-P, RL = 10kΩ 0.01 0.01 % tON, WR VS = 2V, RL = 1kΩ, CL = 35pF 430 600 430 600 ns 160 300 160 300 ns tOFF, WR 100 UNITS Note 3: In-circuit ESD on the switch pins (S or D) exceeds 4kV (see test circuit). Note 4: Leakage current with a 5V supply is guaranteed by correlation with the ±15V leakage current. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Signals on S, D, or IN exceeding V + or V – will be clamped by internal diodes. Limit forward diode current to maximum current rating. U W TYPICAL PERFOR A CE CHARACTERISTICS RON vs VS Over Supply Voltage VSUPPLY = 5V, OV TA = 25°C ID = 1mA 100 V + = 5V 500 V – = 0V ID = 1mA 125°C RON (Ω) 150 ±5V 25°C 60 ±10V 50 –55°C –55°C ±15V 20 ±20V 0 –20 –16 –12 –8 –4 0 4 VS (V) 8 V + = 15V V – = –15V ID = 1mA 100 0 –15 –12 –9 –6 –3 12 16 20 0 0 3 6 9 12 15 0 2 1 3 Positive Supply Current vs Logic Input Voltage Positive Supply Current vs Logic Input Voltage ALL LOGIC INPUTS TIED TOGETHER 200 250 V + = 15V V – = –15V TA = 25°C V + = 5V V – = 0V TA = 25°C 200 150 ALL LOGIC INPUTS TIED TOGETHER I+(µA) I+(µA) 150 ALL INX TIED TOGETHER WR TIED TO GROUND ALL INX TIED TOGETHER WR TIED TO GROUND 100 100 50 50 0 3 6 9 12 15 VIN (V) LTC221/222 • TPC04 0 0 1 3 2 4 5 VIN (V) LTC221/222 • TPC05 4 5 LTC221/222 • TPC03 LTC221/222 • TPC02 250 4 VS (V) VS (V) LTC221/222 • TPC01 0 25°C 300 200 40 100 125°C 400 80 200 RON (Ω) RON vs VS Over Temperature RON (Ω) 250 RON vs VS Over Temperature 2212fa LTC221/LTC222 U W U U APPLICATIO S I FOR ATIO Switching Time Test Circuit Switch output waveform shown for VS = constant with logic input waveform as shown. Note that VS may be (+) or (–) as per switching time test circuit. VO is the steady state output switch on. Feedthrough via gate capacitance may result in spikes at leading and trailing edge of output waveform. Switching Time Test Circuit LOGIC "1" = SW ON LTC222 LOGIC INPUT 3V tr < 20ns tr < 20ns OV 50% LTC221 LOGIC INPUT 3V tr < 20ns tr < 20ns OV LOGIC "0" = SW ON 50% SWITCH INPUT SWITCH INPUT VO VS = 2V RL 1k IN1 SWITCH OV OUTPUT 0.9 VO tON CL 35pF VO = V S LOGIC INPUT VS VO SWITCH OUTPUT D1 S1 RL RL+ RDS(ON) (REPEAT TEST FOR IN2, IN3 AND IN4) 0.9 LTC221/222 • AI02 tOFF LTC221/222 • AI01 Charge Injection Test Circuit RGEN SX ∆VO DX VO CL = 1000pF VGEN VO INX 3V LTC221 INX OV OFF ON ON LTC221/222 • AI03 3V ON ON LTC222 INX OFF OV ∆VO IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION. THE ERROR VOLTAGE IN COULOMBS IS ∆Q = VL • ∆VO LTC221/222 • AI04 OIRR-Off Isolation Test Circuit C SIGNAL GENERATOR CCRR-Channel to Channel Crosstalk Test Circuit C 15V SIGNAL GENERATOR VS V+ VS = 2VP-P f = 100kHz INX CHAN A ANALYZER CHAN B RL 1k C = 0.001µF//0.1µF CHIP CAPACITORS OIRR = 20 LOG VS VD VL IN1 VIN CHAN A ANALYZER CHAN B V– VIN VD1 C = 0.001µF//0.1µF CHIP CAPACITORS LTC221/222 • AI05 OIRR = 20 LOG IN2 VS2 VD2 GND RL 1k C –15V VS1 V+ 50Ω VS = 2Vp-p f = 100kHz VD GND 15V VS1 VD2 V– VIN NC C –15V LTC221/222 • AI06 2212fa 5 LTC221/LTC222 U W U U APPLICATIO S I FOR ATIO In-Circuit ESD Test Circuit ANY SOURCE OR DRAIN PIN LTC221/ LTC222 ESD TESTER 1.5k V+ S OR D 15V ±4kV 100pF POWER APPLIED OR OPEN CIRCUT 0.1µF V– –15V 0.1µF GND PER MIL-STD-883C METHOD 3015.2 LTC221/222 • TA07 WR Switching Time Test Circuit WR 3V 50% LOGIC INPUT 50% 0V 3V LTC221 IN VS = 2V 0V 3V LOGIC INPUT LTC222 IN 0V VS VO VO 0.9 VO 15V V+ WR SWITCH INPUT RL 1k IN1 V– –15V GND OV 0.9 0V VO = V S tON WR LOGIC INPUT tr < 20ns tr < 20ns 1.5V 3V LTC221 IN OV 3V LTC222 IN RL RL+ rDS(ON) LTC221/222 • AI09 LTC221/222 • AI08 WR/Input Minimum Timing Requirements 3V OV CL 35pF (REPEAT TEST FOR IN2, IN3 AND IN4) tOFF WR WR Setup Conditions WR SWITCH OUTPUT VO D1 S1 PARAMETER 1.5V tWW tDW tWD 0.8V 0.8V 2.4V 2.4V MIN LIMIT UNITS tWW Write Pulse Width 230 ns tDW Data Valid to Write 180 ns tWD Data Valid After Write 30 ns OV LTC221/222 • AI10 2212fa 6 LTC221/LTC222 U W U U APPLICATIO S I FOR ATIO Auto Ranging an 8-Channel, 10-Bit A/D Converter VIN OV – 5V CH0 VCC CH1 ACLK CH2 SCLK DIN CH3 CH4 CH5 CH6 CH7 COM DGND SERIAL PORT 5V 15V 15V LTC221/ LTC222 DOUT LTC1090 CS REF+ REF – V– + S1 5V LT1027 15V D1 LT1006 20kΩ – S2 D2 S3 D3 AGND 10kΩ TO MICROCONTROLLER e.g. HD64180 4.99kΩ S4 D4 2.49kΩ IN1 IN2 IN3 DATA BUS B0 – B3 IN4 WR V– WR GND LOGIC DECODER ADDRESS BUS LTC221/222 • AI11 2212fa 7 LTC221/LTC222 U W U U APPLICATIO S I FOR ATIO 8-Channel, 14-Bit A/D Converter CH0 VIN 0V TO 5V CH1 ACLK CH2 SCLK DIN CH3 CH4 CH5 5V SERIAL PORT DOUT LTC1090 CS CH6 CH7 REF+ REF – COM V– DGND 1kΩ 1kΩ 1kΩ LT1027 15V 1kΩ AGND 15V S1 D1 S2 D2 S3 D3 S4 D4 LTC221/ LTC222 TO MICROCONTROLLER e.g. TMS370 IN1 IN2 DATA BUS B0 – B3 IN3 IN4 WR V– WR GND LOGIC DECODER ADDRESS BUS LTC221/222 • AI12 2212fa 8 LTC221/LTC222 U PACKAGE DESCRIPTIO J Package 16-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) .005 (0.127) MIN .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .840 (21.336) MAX 16 15 14 13 12 11 10 9 .220 – .310 (5.588 – 7.874) .025 (0.635) RAD TYP .045 – .065 (1.143 – 1.65) FULL LEAD OPTION 1 2 3 4 5 6 7 8 .200 (5.080) MAX .300 BSC (7.62 BSC) .015 – .060 (0.380 – 1.520) .008 – .018 (0.203 – 0.457) 0° – 15° NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .125 (3.175) MIN .045 – .065 (1.143 – 1.651) .014 – .026 (0.360 – 0.660) .100 (2.54) BSC J16 0801 OBSOLETE PACKAGE 2212fa 9 LTC221/LTC222 U PACKAGE DESCRIPTIO N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .770* (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .009 – .015 (0.229 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE ) .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .020 (0.508) MIN .065 (1.651) TYP .125 (3.175) MIN .100 (2.54) BSC INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) .018 ± .003 (0.457 ± 0.076) N16 0502 2212fa 10 LTC221/LTC222 U PACKAGE DESCRIPTIO S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 15 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 6 7 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 8 .050 (1.270) BSC S16 0502 INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 2212fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LTC221/LTC222 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC201/LTC202/LTC203 Micropower, Low Charge Injection, Quad CMOS Analog Switches DG201/DG202 Compatible LTC1380/LTC1393 8-Channel/4-Channel Analog Multiplexer with SMBus Interface 3V to ±15V, 8 Single Ended/4 Differential Inputs LTC1390/LTC1391 8-Channel, Analog Multiplexer with Serial Interface 3V to ±15V Operation 2212fa 12 Linear Technology Corporation LW/TP 1002 1K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1991