LTC221/LTC222 Micropower, Low Charge Injection, Quad CMOS Analog Switches with Data Latches FEATURES DESCRIPTIO Micropower Operation The LTC 221 and LTC222 are micropower, quad CMOS Single 5V or 15V Supply Operation analog switches which typically dissipate only 250W Low Charge Injection from 15V supplies and 40W from a single 5V supply. Low R Onboard latches allow the LTC221 and LTC222 to inter- ON Low Leakage face directly to most microprocessor buses. The switches Guaranteed Break Before Make have 65 typical on resistance and a very high off resis- Latch Resistant Design tance. A break before make characteristic is inherent in TLL/CMOS Compatible these switches to prevent the shorting of two channels. Improved Second Source for DG221/DG222 The signal range is 15V with a supply voltage of 15V and Microprocessor Bus Compatible 0V to 5V with a single 5V supply. The switches have special charge compensation circuitry which greatly reduces U charge injection to a maximum of 25pC (15V supplies). KEY SPECIFICATIO S The LTC221 and LTC222 are designed for applications + Supply Current ..................... I = 40A, I = 5A Max such as microprocessor controlled programmable gain Charge Injection amplifiers, automatic test equipment, communication 15V Supplies .................................25pC Max systems, and data acquisition systems. The LTC221 is Single 5V Supply .................................. 2pC Typ normally closed and the LTC222 is normally open as R ............................................................... 65 Typ ON shown in the Logic Table. Signal Range ..................................................... 15V , 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 + V IN4 LOGIC 5V ADDRESS BUS DECODER GND IN3 DATA BUS B0 B3 V IN2 IN1 TO MICROPROCESSOR e.g. TMS320C25 15V S1 D1 5V V FS S2 D2 10k IN LTC1292 V CLK IN LT1006 OV TO 5V D 12-BIT S3 D3 OUT SERIAL PORT ADC CS S4 D4 V 150k R1 100k REF IN GND 270 120 15V LT1027 15V V FS LTC221/222 TA01 2212fa 1 + ULTC221/LTC222 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Voltages Referenced to V IN1 1 16 IN2 + NUMBER V ........................................................................................... 44V D1 2 15 D2 LTC221CN GND..................................................................... 25V S1 3 14 S2 + + LTC221CS V 4 13 V Digital Inputs, S, D (Note 2) .......... 2V to (V 2V) or GND 5 12 WR LTC222CN Digital Inputs, S, D (N2020mA, Whichever Occurs First S4 6 11 S3 LTC222CS Current D4 7 10 D3 Any Input Except S or D ................................... 30mA IN4 8 9 IN3 Continuous S or D ............................................ 20mA N PACKAGE S PACKAGE Peak S or D 16-LEAD PDIP 16-LEAD PLASTIC SO J = 110C, = 120C/W J = 110C, = 130C/W (Pulsed at 1 ms, 10% Duty Cycle Max) ......... 70mA MAX JA MAX JA ESD Susceptibility (Note 3) ......................................4kV J PACKAGE LTC221MJ 16-LEAD CERDIP Power Dissipation (Plastic) ............................... 500mW LTC221CJ Power Dissipation (Ceramic) ............................. 900mW LTC222MJ OBSOLETE PACKAGE Operating Temperature Range LTC222CJ Consider the N or S Package for Alternate Source LTC221C/LTC222C .................................. 0C to 70C Consult LTC Marketing for parts specified with wider operating temperature ranges. LTC221M/LTC222M (OBSOLETE).......55C to 125C Storage Temperature Range ................. 65C to 150C LOGIC TABLE Lead Temperature (Soldering, 10 sec).................. 300C INX WR LTC221 LTC222 00 On Off 10 Off On X1 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 T = 25C. V = 15V, V = 15V, GND = 0V, unless noted. A LTC221M/LTC222M LTC221C/LTC222C PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Analog Signal Range 15 15 V R V = 10V T 90 90 ON S MIN I = 1mA 25C65906590 D T 135 135 MAX Off Input Leakage I (OFF) V = 14V, V = 14V 0.01 1 0.01 5nA S D S 100 100 nA Off Output Leakage I (0FF) V = 2.4V, LTC221 0.01 1 0.01 5nA D IN V = 0.8V, LTC222 100 100 nA IN On Channel Leakage l (ON) V = V = 14V, V = 2.4V, LTC222 0.02 1 0.02 5nA D D S IN V = 0.8V, LTC221 200 200 nA IN Input High Voltage V , V 2.4 2.4 V INH WRH Input Low Voltage V , V 0.8 0.8 V INL WRL Input High or Low Current V = 15V, 0V 1 1 A IN I , I , I , I V = 15V, 0V INH INL WRH WRL WR C (OFF) 55 pF S C (OFF) 12 12 pF D C , C (ON) 30 30 pF D S + I All Channels On or Off 16 40 16 40 A V = V = 0V or 4.0V 60 60 A IN WR 2212fa 2 U WWW