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LTC221/LTC222 Micropower, Low Charge Injection, Quad CMOS Analog Switches with Data Latches DESCRIPTIO
The LTC(R)221 and LTC222 are micropower, quad CMOS analog switches which typically dissipate only 250W from 15V supplies and 40W from a single 5V supply. Onboard latches allow the LTC221 and LTC222 to interface directly to most microprocessor buses. The switches have 65 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). 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.
FEATURES

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
KEY SPECIFICATIO S

Supply Current ..................... I+ = 40A, I - = 5A Max Charge Injection 15V Supplies ................................. 25pC Max Single 5V Supply .................................. 2pC Typ RON ............................................................... 65Typ Signal Range ..................................................... 15V
TYPICAL APPLICATIO
LTC221/LTC222 WR 5V V+ GND V- IN4 IN3 IN2 IN1 VFS VIN OV TO 5V S3 S4 D3 D4 S1 S2 D1 D2
Two-Channel, 12-Bit, Self Calibrating Data Acquisition System
WR LOGIC DECODER
ADDRESS BUS DATA BUS B0 - B3 TO MICROPROCESSOR e.g. TMS320C25
15V
5V 10k IN
+
LT1006
LTC1292 12-BIT ADC
CLK DOUT CS SERIAL PORT 100k
-
150k -IN GND 120 -15V
R1 VREF
270 LT1027 VFS 15V
LTC221/222 * TA01
U
U
U
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1
LTC221/LTC222
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
IN1 1 D1 2 S1 3 V- 4 GND 5 S4 6 D4 7 IN4 8 16 IN2 15 D2 14 S2 13 V + 12 WR 11 S3 10 D3 9 IN3
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 .................................. 0C to 70C LTC221M/LTC222M (OBSOLETE).......-55C to 125C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC221CN LTC221CS LTC222CN LTC222CS
N PACKAGE 16-LEAD PDIP JMAX = 110C, JA = 120C/W
S PACKAGE 16-LEAD PLASTIC SO JMAX = 110C, JA = 130C/W
J PACKAGE 16-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N or S Package for Alternate Source
LTC221MJ LTC221CJ LTC222MJ LTC222CJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LOGIC TABLE
INX 0 1 X WR 0 0 1 LTC221 On Off Maintain Previous State LTC222 Off On Maintain Previous State
DIGITAL A D DC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply + -
over full operating temperature range, otherwise specifications are at TA = 25C. V = 15V, V = -15V, GND = 0V, unless noted.
PARAMETER Analog Signal Range RON CONDITIONS
LTC221M/LTC222M MIN TYP MAX 15 90 90 135 1 100 1 100 1 200
LTC221C/LTC222C MIN TYP MAX 15 90 90 135 5 100 5 100 5 200 0.8 1 5 12 30 16
UNITS V nA nA nA nA nA nA V V A pF pF pF A A
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VS = 10V ID = 1mA
Off Input Leakage IS (OFF) 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+
TMIN 25C TMAX VD = 14V, VS = 14V
65 0.01 0.01
65 0.01 0.01 0.02 2.4
VIN = 2.4V, LTC221 VIN = 0.8V, LTC222 VD = VS = 14V, VIN = 2.4V, LTC222 VIN = 0.8V, LTC221
0.02

2.4 0.8 1 5 12 30 16
VIN = 15V, 0V VWR = 15V, 0V
All Channels On or Off VIN = VWR = 0V or 4.0V
40 60
40 60
2
U
W
U
U
WW
W
U
LTC221/LTC222
DIGITAL A D DC ELECTRICAL CHARACTERISTICS The- denotes the specifications which apply +
over full operating temperature range, otherwise specifications are at TA = 25C. V = 15V, V = -15V, GND = 0V, unless noted.
CONDITIONS
PARAMETER I-
AC ELECTRICAL CHARACTERISTICS
V + = 15V, V - = -15V, GND = 0V, unless otherwise noted.
PARAMETER tON tOFF tOPEN Off Isolation Crosstalk Charge Injection OINJ Total Harmonic Distortion THD tON, WR tOFF, WR VS = 2Vp-p, RL = 1k f = 100kHz RGEN = 0, CL = 1000pF, VGEN = 0 VS = 2Vp-p, RL = 10k VS = 2V, RL = 1k, CL = 35pF 20 CONDITIONS VS = 2V, RL = 1k, CL = 35pF LTC221M/LTC222M MIN TYP MAX 290 210 85 75 90 5 0.01 270 160 400 300 25 400 300 20 LTC221C/LTC222C MIN TYP MAX 290 210 85 75 90 8 0.01 270 160 400 300 25 pC % ns 400 300 ns dB UNITS ns
The denotes the specifications which apply over full operating temperature range, otherwise specifications are at TA = 25C. V + = 5V, V - = GND = 0V, unless noted.
PARAMETER Analog Signal Range RON VS = 1.5V, 3V ID = 0.25mA Off Input Leakage IS (OFF) Off Output Leakage ID (0FF)
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
CONDITIONS
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+
U
U
LTC221M/LTC222M MIN TYP MAX 0.1 5 10
LTC221C/LTC222C MIN TYP MAX 0.1 5 10
UNITS A
LTC221M/LTC222M MIN TYP MAX 0 280 0.01
LTC221C/LTC222C MIN TYP MAX 0 280 0.01 0.01 0.01 2.4 5 520 520 650 5 100 5 100 5 200 0.8 1 5 12 30
UNITS V nA nA nA nA nA nA V V A pF pF pF
5 450 450 650 1 100 0.01 1 100 0.01 1 200
TMIN 25C TMAX
VD = 4V, 1V; VS = 1V, 4V (Note 4)
VD = VS = 1V, 4V (Note 4)

2.4 0.8 1 5 12 30
VIN = 5V, 0V VWR = 5V, 0V
All Channels On or Off VIN = VWR = 0V or 4.0V
8
20 30
8
20 30
A A
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LTC221/LTC222
AC ELECTRICAL CHARACTERISTICS
PARAMETER tON tOFF tOPEN Off Isolation Crosstalk Charge Injection OINJ Total Harmonic Distortion THD tON, WR tOFF, WR 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. VS = 2VP-P, RL = 1k f = 100kHz RGEN = 0, CL = 1000pF, VGEN = 2.5V VS = 2VP-P, RL = 10k VS = 2V, RL = 1k, CL = 35pF 100 CONDITIONS VS = 2V, RL = 1k, CL = 35pF
V + = 5V, V - = GND = 0V, unless otherwise noted.
LTC221M/LTC222M MIN TYP MAX 450 190 250 75 90 2 0.01 430 160 600 300 600 300 100 LTC221C/LTC222C MIN TYP MAX 450 190 250 75 90 2 0.01 430 160 600 300 600 300
UNITS ns ns ns dB dB pC % ns ns
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.
TYPICAL PERFOR A CE CHARACTERISTICS
RON vs VS Over Supply Voltage
250 200 TA = 25C ID = 1mA VSUPPLY = 5V, OV
100 80
RON () RON ()
RON ()
150 5V 100 10V 50 15V 20V
0 -20 -16 -12 -8 -4
04 VS (V)
8
12 16 20
LTC221/222 * TPC01
Positive Supply Current vs Logic Input Voltage
250 ALL LOGIC INPUTS TIED TOGETHER 200 V + = 15V V - = -15V TA = 25C
150 I+(A) ALL INX TIED TOGETHER WR TIED TO GROUND 100
I+(A)
50
0
0
3
4
UW
6 VIN (V) 9
RON vs VS Over Temperature
125C
RON vs VS Over Temperature
V + = 5V 500 V - = 0V ID = 1mA 400 125C
60 40
25C
300 200
25C
-55C -55C 20 V + = 15V V - = -15V ID = 1mA 100
0 -15 -12 -9 -6 -3
0 0 3 6 9 12 15
0
1
2 VS (V)
3
4
5
VS (V)
LTC221/222 * TPC02
LTC221/222 * TPC03
Positive Supply Current vs Logic Input Voltage
250 V + = 5V V - = 0V TA = 25C ALL LOGIC INPUTS TIED TOGETHER
200
150 ALL INX TIED TOGETHER WR TIED TO GROUND 100
50
12
15
0
0
1
2 VIN (V)
3
4
5
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LTC221/222 * TPC04
LTC221/222 * TPC05
LTC221/LTC222
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
LTC222 LOGIC INPUT 3V tr < 20ns tr < 20ns OV LTC221 LOGIC INPUT 3V tr < 20ns tr < 20ns OV SWITCH INPUT VS
LOGIC "1" = SW ON 50%
LOGIC "0" = SW ON 50%
VO tON
0.9
VO tOFF
SWITCH OV OUTPUT
LTC221/222 * AI01
RGEN
SX
DX VO CL = 1000pF INX
VGEN
LTC221/222 * AI03
OIRR-Off Isolation Test Circuit
C 15V
SIGNAL GENERATOR VS = 2VP-P f = 100kHz CHAN A ANALYZER CHAN B RL 1k C = 0.001F//0.1F CHIP CAPACITORS VS VD
VS V+ INX
VD GND V-
OIRR = 20 LOG
C -15V
LTC221/222 * AI05
U
state output switch on. Feedthrough via gate capacitance may result in spikes at leading and trailing edge of output waveform.
Switching Time Test Circuit
SWITCH INPUT VS = 2V IN1 LOGIC INPUT RL 1k S1 D1 SWITCH OUTPUT VO CL 35pF VO = V S RL RL+ RDS(ON)
W
UU
0.9
(REPEAT TEST FOR IN2, IN3 AND IN4)
LTC221/222 * AI02
Charge Injection Test Circuit
VO
VO
3V LTC221 INX OV 3V LTC222 INX OV ON ON OFF OFF ON ON
VO IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION. THE ERROR VOLTAGE IN COULOMBS IS Q = VL * VO
LTC221/222 * AI04
CCRR-Channel to Channel Crosstalk Test Circuit
C 15V
SIGNAL GENERATOR VS = 2Vp-p f = 100kHz
VIN
VS1 V+
VL
VD1
50
IN1 CHAN A ANALYZER CHAN B VIN RL 1k C = 0.001F//0.1F CHIP CAPACITORS VS1 VD2
IN2
VIN
VD2 GND V-
VS2
NC
OIRR = 20 LOG
C -15V
LTC221/222 * AI06
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LTC221/LTC222
APPLICATIO S I FOR ATIO
ANY SOURCE OR DRAIN PIN ESD TESTER 1.5k S OR D LTC221/ LTC222 V+ 15V
4kV 100pF
PER MIL-STD-883C METHOD 3015.2
LTC221/222 * TA07
WR Switching Time Test Circuit
WR 3V 50% 0V 3V LTC221 IN 0V 3V LTC222 IN 0V VS VO 0V tON WR LOGIC INPUT tr < 20ns tr < 20ns tOFF WR
LTC221/222 * AI08
50%
VO
0.9
VO
0.9
WR Setup Conditions
3V WR OV 3V LTC221 IN OV 3V LTC222 IN OV
LTC221/222 * AI10
1.5V tWW tDW
1.5V
tWD 0.8V
0.8V
2.4V
2.4V
6
U
In-Circuit ESD Test Circuit
0.1F POWER APPLIED OR OPEN CIRCUT V- 0.1F GND -15V
LOGIC INPUT SWITCH INPUT VS = 2V LOGIC INPUT S1 WR 15V V+ D1 RL 1k SWITCH OUTPUT VO CL 35pF IN1 GND OV VO = V S V- -15V RL RL+ rDS(ON)
LTC221/222 * AI09
W
UU
(REPEAT TEST FOR IN2, IN3 AND IN4)
WR/Input Minimum Timing Requirements
PARAMETER tWW tDW tWD Write Pulse Width Data Valid to Write Data Valid After Write MIN LIMIT 230 180 30 UNITS ns ns ns
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LTC221/LTC222
APPLICATIO S I FOR ATIO U
SERIAL PORT 15V 15V LTC221/ LTC222 5V LT1027 D1 20k 15V S1 S2 D2 10k S3 D3 4.99k S4 D4 2.49k TO MICROCONTROLLER e.g. HD64180 IN1 IN2 IN3 IN4 WR V- WR GND LOGIC DECODER ADDRESS BUS
LTC221/222 * AI11
CH0 CH1 CH2 VIN OV - 5V CH3 CH4 CH5 CH6 CH7 COM DGND LTC1090
VCC ACLK SCLK DIN DOUT CS REF+ REF - V- AGND
5V
W
UU
Auto Ranging an 8-Channel, 10-Bit A/D Converter
+
LT1006
-
DATA BUS B0 - B3
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LTC221/LTC222
APPLICATIO S I FOR ATIO
8-Channel, 14-Bit A/D Converter
CH0 CH1 CH2 VIN 0V TO 5V CH3 CH4 CH5 CH6 CH7 COM DGND 15V S1 S2 S3 S4 LTC221/ LTC222 D1 D2 D3 D4 IN1 IN2 IN3 IN4 WR V- WR GND LOGIC DECODER ADDRESS BUS
LTC221/222 * AI12
ACLK SCLK DIN DOUT LTC1090 CS REF+ REF - V- AGND
5V SERIAL PORT
8
U
1k 1k 1k LT1027 15V 1k TO MICROCONTROLLER e.g. TMS370 DATA BUS B0 - B3
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W
UU
LTC221/LTC222
PACKAGE DESCRIPTIO U
J Package 16-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.840 (21.336) MAX 16 15 14 13 12 11 10 9 .005 (0.127) MIN .025 (0.635) RAD TYP 1 2 3 4 5 6 7 8 .200 (5.080) MAX .015 - .060 (0.380 - 1.520) .220 - .310 (5.588 - 7.874) .125 (3.175) MIN .045 - .065 (1.143 - 1.651) .014 - .026 (0.360 - 0.660) .100 (2.54) BSC
J16 0801
CORNER LEADS OPTION (4 PLCS)
.023 - .045 (0.584 - 1.143) HALF LEAD OPTION .045 - .065 (1.143 - 1.65) FULL LEAD OPTION .300 BSC (7.62 BSC)
.008 - .018 (0.203 - 0.457)
0 - 15
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
OBSOLETE PACKAGE
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LTC221/LTC222
PACKAGE DESCRIPTIO U
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 .255 .015* (6.477 0.381) 1 2 3 4 5 6 7 8 .130 .005 (3.302 0.127) .020 (0.508) MIN .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .125 (3.175) MIN .018 .003 (0.457 0.076) .100 (2.54) BSC
N16 0502
.300 - .325 (7.620 - 8.255)
.009 - .015 (0.229 - 0.381) +.035 .325 -.015 +0.889 8.255 -0.381
(
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
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LTC221/LTC222
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 16 15 14 13 12 11 10 9
.045 .005 .050 BSC N
.245 MIN
.160 .005 .228 - .244 (5.791 - 6.197) 1 2 3 N/2 N/2
.030 .005 TYP
RECOMMENDED SOLDER PAD LAYOUT 1
.010 - .020 x 45 (0.254 - 0.508)
.008 - .010 (0.203 - 0.254)
0 - 8 TYP
.016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
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)
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.
U
N .150 - .157 (3.810 - 3.988) NOTE 3 2 3 4 5 6 7 8 .053 - .069 (1.346 - 1.752) .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
S16 0502
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LTC221/LTC222
RELATED PARTS
PART NUMBER LTC1380/LTC1393 LTC1390/LTC1391 DESCRIPTION 8-Channel/4-Channel Analog Multiplexer with SMBus Interface 8-Channel, Analog Multiplexer with Serial Interface COMMENTS 3V to 15V, 8 Single Ended/4 Differential Inputs 3V to 15V Operation LTC201/LTC202/LTC203 Micropower, Low Charge Injection, Quad CMOS Analog Switches DG201/DG202 Compatible
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LW/TP 1002 1K REV A * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1991

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