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MAX4625EUT-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4625EUT-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page 1 Ω, Low-Voltage, Single-Supply SPDT Analog Switches 6 _______________________________________________________________________________________ Pin Description Detailed Description The MAX4624/MAX4625 are low-on-resistance (RON), low-voltage, single-pole/double-throw (SPDT) analog switches that operate from a +1.8V to +5.5V supply. The MAX4624 has break-before-make switching, and the MAX4625 has make-before-break switching. These devices also have fast switching speeds (tON = 50ns max, tOFF = 50ns max). When powered from a +5V supply, their 1 Ω max RON allows high continuous currents to be switched in a variety of applications. In an overcurrent condition, these switches provide both current-limit and thermal- shutdown protection. Current-Limit Protection The MAX4624/MAX4625 feature current-limit protection circuitry. When the voltage drop across the on switch reaches 0.6V typ, the internal circuitry activates. The current limit is not instantaneous, but rather integrates over time, so current limiting will not activate when the switch output charges a small 0.1µF capacitor. For sus- tained overload conditions, the switch turns off (opens). The switch turns on after 5ms. If the overload persists, the switch cycles off and on to produce a pulsed out- put. A direct short circuit will be detected immediately, and the switch will pulse on for 1µs, then remain off for 5ms. Applications Information Logic Inputs The MAX4624/MAX4625 logic inputs can be driven up to +5.5V regardless of the supply voltage. For example, with a +3.3V supply, IN may be driven low to 0V and high to 5.5V. 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. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum rat- ings because stresses beyond the listed ratings may cause permanent damage to the devices. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. If this sequencing is not possible, and if the analog inputs are not current limited to <20mA, add Analog Switch—Common COM 5 Analog Switch—Normally Open NO 6 Analog Switch—Normally Closed NC 4 Ground GND 3 PIN Positive Supply Voltage Input V+ 2 Digital Control Input IN 1 FUNCTION NAME POSITIVE SUPPLY COM NO D2 D1 GND Vg V+ MAX4624 MAX4625 Figure 1. Overvoltage Protection Using Two External Blocking Diodes Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. |
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