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MAX4560ESE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4560ESE Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page _______________Detailed Description The MAX4558/MAX4559/MAX4560 are ESD protected (per IEC 1000-4-2) at their X, Y, Z output pins and X_, Y_, Z_ input pins. These ICs feature on-chip bidirection- al silicon-controlled rectifiers (SCRs) between the pro- tected pins and GND. The SCRs are normally off and have a negligible effect on the switches’ performance. During an ESD strike, the voltages at the protected pins go Beyond-the-Rails™, causing the corresponding SCR(s) to turn on in a few nanoseconds. This bypasses the surge current safely to ground. This protection method is superior to using diode clamps to the sup- plies. Unless the supplies are very carefully decoupled through low-ESR capacitors, the ESD current through a diode clamp could cause a significant spike in the sup- plies, which might damage or compromise the reliabili- ty of any other chip powered by those same supplies. In addition to the SCRs at the ESD-protected pins, these devices provide internal diodes connected to the supplies. Resistors placed in series with these diodes limit the current flowing into the supplies during an ESD strike. The diodes protect the X, Y, Z and X_, Y_, Z_ pins from overvoltages due to improper power-supply sequencing. Once the SCR turns on because of an ESD strike, it remains on until the current through it falls below its “holding current.” The holding current is typically 110mA in the positive direction (current flowing into the pin) and 95mA in the negative direction at room tem- perature (see SCR Holding Current vs. Temperature in the Typical Operating Characteristics). The system should be designed so that any sources connected to the X, Y, Z or X_, Y_, Z_ pins are current limited to a value below the holding current. This ensures that the SCR turns off and normal operation resumes after an ESD event. Keep in mind that the holding currents vary significantly with temperature; they drop to 70mA (typ) in the posi- tive direction and 65mA (typ) in the negative direction, at +85°C worst case. To guarantee turn-off of the SCRs under all conditions, current limit the sources connect- ed to these pins to not more than half of these typical values. When the SCR is latched, the voltage across it is about ±3V, depending on the polarity of the pin cur- rent. The supply voltages do not affect the holding cur- rents appreciably. When one or more SCRs turn on because of an ESD event, all switches in the part turn off to prevent current through the switch(es) from sus- taining latchup. Even though most of the ESD current flows to GND through the SCRs, a small portion of it goes into the supplies. Therefore, it is a good idea to bypass the supply pins with 100nF capacitors to the ground plane. __________Applications Information ESD Protection The MAX4558/MAX4559/MAX4560 are characterized for protection to the following: • ±15kV using the Human Body Model • ±8kV using the Contact Discharge method specified in IEC 1000-4-2 (formerly IEC 801-2) • ±12kV using the Air-Gap Discharge method speci- fied in IEC 1000-4-2 (formerly IEC 801-2). ±15kV ESD-Protected, Low-Voltage, CMOS Analog Multiplexers/Switches _______________________________________________________________________________________ 9 Table 1. Truth Table/Switch Programming ENABLE INPUT C* B A SELECT INPUTS X X L L L L X H H L L H L L H H L L H L L L L L H L H L L H H L H H H L X-X0, Y-Y1, Z-Z1 MAX4558 MAX4559 MAX4560 X-X2, Y-Y2 X-X6 ON SWITCHES X-X1, Y-Y1, Z-Z1 X-X3, Y-Y3 X-X7 All switches open All switches open X-X0, Y-Y0, Z-Z0 X-X0, Y-Y0 X-X0 All switches open X-X1, Y-Y0, Z-Z0 X-X1, Y-Y1 X-X0, Y-Y1, Z-Z0 X-X2, Y-Y2 X-X2 X-X1, Y-Y1, Z-Z0 X-X3, Y-Y3 X-X0, Y-Y0, Z-Z1 X-X0, Y-Y0 X-X4 X-X3 X-X1 X-X1, Y-Y0, Z-Z1 X-X1, Y-Y1 X-X5 X = Don’t care * C not present on MAX4559. Note: Input and output pins are identical and interchangeable. Either may be considered an input or output; signals pass equally well in either direction. Beyond-the-Rails is a trademark of Maxim Integrated Products. |
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