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MAX324CSA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX324CSA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Precision, Single-Supply, SPST Analog Switches 6 _______________________________________________________________________________________ __________Applications Information Logic Levels The MAX323/MAX324/MAX325 are TTL compatible when powered from a single +5V supply. When pow- ered from other supply voltages, TTL compatibility is not guaranteed, and the logic inputs should be driven from rail to rail. For example, with a 15V supply, IN1 and IN2 should be driven low to 0V and high to 15V. Similarly, with a 3.3V supply, IN1 and IN2 should be dri- ven low to 0V and high to 3.3V Driving IN1 and IN2 rail-to-rail minimizes power con- sumption. Analog Signal Levels Analog signals that range over the entire supply voltage (V+ to GND) can be switched with very little change in on-resistance over the entire voltage range (see Typical Operating Characteristics). All the switches are bidirec- tional, so NO_, NC_, and COM_ pins can be used as either inputs or outputs. Power-Supply Sequencing and Overvoltage Protection Do not exceed the absolute maximum ratings, 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 or logic inputs, especially if the analog or logic signals are not current-limited. If this sequenc- ing is not possible, and if the analog or logic inputs are not current-limited to <30mA, add a small-signal diode (D1) as shown in Figure 1. If the analog signal can dip below GND, add D2. Adding protection diodes reduces the analog signal range to a diode-drop (about 0.7V) below V+ (for D1), and to a diode-drop above ground (for D2). Leakage is unaffected by adding the diodes. On-resistance increases by a small amount at low sup- ply voltages. Maximum supply voltage (V+) must not exceed 17V. Adding protection diodes causes the logic thresholds to be shifted relative to the power-supply rails. This can be significant when low supply voltages (5V or less) are used. With a 5V supply, TTL compatibility is not guaran- teed when protection diodes are added. Driving IN1 and IN2 all the way to the supply rails (i.e. to a diode- drop higher than the V+ pin, or to a diode-drop lower than the GND pin) is always acceptable. Protection diodes D1 and D2 also protect against some overvoltage situations. With Figure 1’s circuit, if the supply voltage is below the absolute maximum rat- ing, and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result. For example, with a +5V supply, analog sig- nals up to ±8V will not damage the circuit of Figure 1. If only a single fault signal is present, the fault voltage can rise to +17V or to -12V without damage occurring. _____________________Pin Description POSITIVE SUPPLY COM NO D2 D1 GND Vg V+ Figure 1. Overvoltage Protection Using Two External Blocking Diodes Normally Closed Analog Switch Terminal (MAX324/MAX325) NC2 Normally Open Analog Switch Terminal (MAX323 only) NO2 5 Ground GND 4 Logic Inputs IN2, IN1 3, 7 PIN Analog Switch Common Terminal COM1, COM2 2, 6 Normally Closed Analog Switch Terminal (MAX324 only) NC1 Normally Open Analog Switch Terminal (MAX323/MAX325) NO1 1 FUNCTION NAME Positive Supply V+ 8 |
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