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MAX318ESA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX318ESA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Precision, CMOS Analog Switches 6 _______________________________________________________________________________________ PIN NAME FUNCTION MAX317 MAX318 MAX319 1 1 1 COM Analog-switch common terminal 2 2 — N.C. No connect — not internally connected — — 8 NO Analog-switch normally open terminal 3 3 3 GND Logic ground 4 4 4 V+ Analog-signal positive supply input 5 5 5 VL Logic-level positive supply input 6 6 6 IN Logic-level input 7 7 7 V- Analog-signal negative supply input 8 — 2 NC Analog-switch normally closed terminal — 8 — NO Analog-switch normally open terminal _______________________________________________________________________Pin Description __________Applications Information Operation with Supply Voltages Other Than ±15V The main limitation of supply voltages other than ±15V is analog signal range reduction. The MAX317/ MAX318/MAX319 switches operate with bipolar sup- plies of ±5V to ±20V. Typical Operating Characteristics graphs show typical on resistance for ±15V, ±10V, and ±5V supplies. Switching times increase by a factor of two or more for operation at ±5V. The MAX317/MAX318/MAX319 can operate from unipolar supplies of +10V to +30V. Both parts can also operate from unbalanced supplies such as +24V and -5V. Connect V- to 0V when operating with a single supply. This means that VL must be connected to +5V to be TTL compatible, or to V+ for CMOS logic input levels. Overvoltage Protection Proper power-supply sequencing is recommended for all CMOS devices. It is important not to exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the devices. Always sequence V+ on first, followed by VL, V-, and logic inputs. If power-supply sequencing is not possible, protect the devices from overvoltage by adding two small signal diodes in series with the sup- ply pins (Figure 1). Adding the diodes reduces the analog signal range to 1V below V+ and 1V below V-, but low switch resistance and low leakage characteris- tics are unaffected. Device operation is unchanged, and the difference between V+ to V- should not exceed +44V. V+ COM_ V- NO_ Vg V+ V- Figure 1. Overvoltage Protection Using Blocking Diodes |
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