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MAX4580CPE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4580CPE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 1.25 Ω, Dual SPST, CMOS Analog Switches 8 _______________________________________________________________________________________ ___________Applications Information Overvoltage Protection 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, then V-, followed by the logic inputs, NO, or COM. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to one diode drop below V+ and one diode drop above V-, but does not affect the devices’ low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between V+ and V- should not exceed 44V. These protection diodes are not recommended when using a single supply. COM_ V- V+ NO_ * INTERNAL PROTECTION DIODES D2 D1 -15V +15V MAX4580 MAX4590 MAX4600 * * * * tr < 20ns tf < 20ns 50% 0 LOGIC INPUT V- -15V RL 100 Ω NO_ OR NC_ GND CL INCLUDES FIXTURE AND STRAY CAPACITANCE. SWITCH INPUT IN_ +3V tOFF 0 COM_ SWITCH OUTPUT 0.9V0 0.9V0 tON VO SWITCH OUTPUT LOGIC INPUT LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. VL V+ CL 35pF +5V +15V VO VCOM_ 0 REPEAT TEST FOR EACH SWITCH. FOR LOAD CONDITIONS, SEE Electrical Characteristics. MAX4580 MAX4590 MAX4600 VO = VCOM ( ) RL + RON RL Figure 1. Overvoltage Protection Using External Blocking Diodes Figure 2. Switching-Time Test Circuit |
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