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MAX4583EPE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4583EPE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 18 page slightly, so when VCC reaches +12V the threshold is about 3.1V (above the TTL-guaranteed high-level mini- mum of 2.8V, but still compatible with CMOS outputs). Bipolar Supplies These devices operate with bipolar supplies between ±2V and ±5V. The VCC and VEE supplies need not be symmetrical, but their sum cannot exceed the +13V absolute maximum rating Single Supply These devices operate from a single supply between +2V and +12V when VEE is connected to GND. All of the bipolar precautions must be observed. At room temperature, they actually “work” with a single supply near or below +1.7V, although as supply voltage decreases, switch on-resistance and switching times become very high. 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 VCC on first, then VEE, followed by the logic inputs and analog signals. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with the supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog-signal range to one diode drop below VCC and one diode drop above VEE, but does not affect the devices’ low switch resistance and low leakage characteristics. Device operation is unchanged, and the difference between VCC and VEE should not exceed 13V. These protection diodes are not recommended when using a single supply if signal levels must extend to ground. High-Frequency Performance In 50 Ω systems, signal response is reasonably flat up to 50MHz (see Typical Operating Characteristics). Above 20MHz, the on response has several minor peaks which are highly layout dependent. The problem is not turning the switch on, but turning it off. The off- state switch acts like a capacitor and passes higher frequencies with less attenuation. At 10MHz, off isola- tion is about -50dB in 50 Ω systems, becoming worse (approximately 20dB per decade) as frequency in- creases. Higher circuit impedances also degrade off isolation. Adjacent channel attenuation is about 3dB above that of a bare IC socket and is entirely due to capacitive coupling. Pin Nomenclature The MAX4581/MAX4582/MAX4583 are pin-compatible with the industry-standard 74HC4051/74HC4052/ 74HC4053 and the MAX4051/MAX4052/MAX4053. They function identically and have identical logic dia- grams, although these parts differ electrically. The pin designations and logic diagrams in this data sheet conform to the original 1972 specifications pub- lished by RCA for the CD4051/CD4052/CD4053. These designations differ from the standard Maxim switch and mux designations as found all other Maxim data sheets (including the MAX4051/MAX4052/MAX4053) and may cause confusion. Designers who feel more comfortable with Maxim’s standard designations are advised that the pin designations and logic diagrams on the MAX4051/MAX4052/MAX4053 data sheet may be freely applied to the MAX4581/MAX4582/MAX4583. Low-Voltage, CMOS Analog Multiplexers/Switches 10 ______________________________________________________________________________________ X, Y, Z X_, Y_, Z_ VEE VCC *INTERNAL PROTECTION DIODES D2 EXTERNAL BLOCKING DIODE D1 EXTERNAL BLOCKING DIODE VEE VCC MAX4581 MAX4582 MAX4583 * * * * Figure 1. Overvoltage Protection Using External Blocking Diodes |
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