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MAX397EQI Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX397EQI Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Precision, 16-Channel/Dual 8-Channel, Low-Voltage, CMOS Analog Multiplexers _______________________________________________________________________________________ 7 ______________________________________________________________Pin Description — PIN MAX396 MAX397 NAME FUNCTION 1 V+ Positive Supply-Voltage Input 2, 3, 13 1 N.C. No Internal Connection — 2 COMB Analog Signal B Output* (bidirectional) — 3, 13, 14 N.C. No Internal Connection 4–11 — NO16–NO9 Analog Signal Inputs* (bidirectional) — 4–11 NO8B–NO1B Analog Signal B Inputs* (bidirectional) 12 12 GND Logic Ground 14–17 — A3–A0 Logic Address Inputs — 15, 16, 17 A2, A1, A0 Logic Address Inputs 18 18 EN Logic Enable Input 19–26 — NO1–NO8 Analog Signal Inputs* (bidirectional) — 19–26 NO1A–NO8A Analog Signal A Inputs* (bidirectional) 27 27 V- Negative Supply-Voltage Input 28 — COM Analog Signal Output* (bidirectional) — 28 COMA Analog Signal A Output* (bidirectional) __________Applications Information Operation with Supply Voltages Other than ±5V Using supply voltages less than ±5V reduces the analog signal range. The MAX396/MAX397 multiplexers (muxes) operate with ±3V to ±8V bipolar supplies or with a +3V to +15V single supply. Connect V- to GND when operating with a single supply. Both devices can also operate with unbalanced supplies, such as +10V and -5V. The Typical Operating Characteristics graphs show typical on- resistance with ±3V, ±5V, +3V, and +5V supplies. (Switching times increase by a factor of two or more for operation at 5V or below.) These muxes operate with a single supply as low as 1V, although on-resistance and switching times become extremely high. Performance is not guaranteed below 2.7V. This is useful information only because it assures proper switch state while power supplies ramp up or down slowly. 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 17V. These protection diodes are not recommended when using a single supply. *Analog signal inputs and outputs are names of convenience only; they are identical and interchangeable. COM V- V+ NO *INTERNAL PROTECTION DIODES D2 D1 -5V +5V MAX396 MAX397 * * * * Figure 1. Overvoltage Protection Using External Blocking Diodes |
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