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MAX308CUE Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX308CUE Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page __________Applications Information Operation with Supply Voltages Other than 15V Using supply voltages less than ±15V will reduce the analog signal range. The MAX308/MAX309 switches operate with ±5V to ±20V bipolar supplies or with a +5V to +30V single supply. Connect V- to GND when operating with a single supply. Both device types can also operate with unbalanced supplies, such as +24V and -5V. The Typical Operating Characteristics graphs show typical on-resistance with 20V, 15V, 10V, and 5V supplies. (Switching times increase by a factor of two or more for operation at 5V.) 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 may 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 in series with supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to 1V below V+ and 1V above V-, but does not affect the devices’ low switch resistance and low leakage charac- teristics. Device operation is unchanged, and the differ- ence between V+ and V- should not exceed +44V. Precision, 8-Channel/Dual 4-Channel, High-Performance, CMOS Analog Multiplexers 6 _______________________________________________________________________________________ ______________________________________________________________Pin Description Vg NO COM V- V+ Figure 1. Overvoltage Protection Using External Blocking Diodes PIN MAX308 MAX309 NAME FUNCTION 1, 15, 16 A0, A2, A1 Address Inputs — — A0, A1 Address Inputs 2 2 EN Enable Input 3 3 V- Negative Supply Voltage Input 4–7 — NO1–NO4 Analog Inputs—Bidirectional — 4–7 NO1A–NO4A Analog Inputs—Bidirectional 8 — COM Analog Output—Bidirectional — 8, 9 COMA, COMB Analog Outputs—Bidirectional 9–12 — NO8–NO5 Analog Inputs—Bidirectional — 10–13 NO4B–NO1B Analog Inputs—Bidirectional 13 14 V+ Positive Supply Voltage Input 14 15 GND Ground 1, 16 |
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