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MAX4743 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX4743 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Detailed Description The MAX4741/MAX4742/MAX4743 are low 0.8 Ω max (at V+ = +3V) on-resistance, low-voltage, dual analog switches that operate from a +1.6V to +3.6V single sup- ply. CMOS switch construction allows switching analog signals that are within the supply voltage range (GND to V+). When powered from a +3V supply, the 0.8 Ω max RON allows high continuous currents to be switched in a variety of applications. Applications Information Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maxi- mum ratings, because stresses beyond the listed rat- ings can cause permanent damage to the devices. Always sequence V+ on first, followed by NO_, NC_, or COM_. Although it is not required, power-supply bypassing improves noise margin and prevents switching noise propagation from the V+ supply to other components. A 0.1µF capacitor, connected from V+ to GND, is ade- quate for most applications. Logic Inputs The MAX4741/MAX4742/MAX4743 logic inputs can be driven up to +3.6V regardless of the supply voltage. For example, with a +1.8V supply, IN_ may be driven low to GND and high to +3.6V. Driving IN_ rail-to-rail minimizes power consumption. Analog Signal Levels Analog signals that range over the entire supply voltage (V+ to GND) can be passed with very little change in on- resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ pins can be used as either inputs or outputs. Layout High-speed switches require proper layout and design procedures for optimum performance. Reduce stray inductance and capacitance by keeping traces short and wide. Ensure that bypass capacitors are as close to the device as possible. Use large ground planes where possible. 0.8 Ω, Low-Voltage, Single-Supply Dual SPST Analog Switches _______________________________________________________________________________________ 7 Pin Description PIN MAX4741 MAX4742 MAX4743 µMAX SOT23-8 µMAX SOT23-8 µMAX SOT23-8 NAME FUNCTION 18 —— 1 8 NO1 Analog Switch 1 Normally Open —— 18 —— NC1 Analog Switch 1 Normally Closed 2 7 2 7 2 7 COM1 Analog Switch 1 Common 3 6 3 6 3 6 IN2 Logic Control Input Switch 2 4 5 4 5 4 5 GND Ground 53 —— — — NO2 Analog Switch 2 Normally Open —— 5 3 5 3 NC2 Analog Switch 2 Normally Closed 6 4 6 4 6 4 COM2 Analog Switch 2 Common 7 1 7 1 7 1 IN1 Logic Control Input Switch 1 8 2 8 2 8 2 V+ Positive Supply Voltage |
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