PDF MAX14778 Data sheet ( Hoja de datos )

Número de pieza	MAX14778
Descripción	Dual +-25V Above- and Below-the-Rails 4:1 Analog Multiplexer
Fabricantes	Maxim Integrated
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No Preview Available ! 19-5929; Rev 1; 6/12 EVALUATION KIT AVAILABLE MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer General Description The MAX14778 dual 4:1 analog multiplexer supports analog signals up to Q25V with a single 3.0 to 5.5V supply. Each multiplexer has separate control inputs to allow independent switching, making the device ideal for multiplexing different communications signals with the same connector pins. Extended ESD protection of Q6kV (Human Body Model) enable direct interfacing to cables and connectors. The MAX14778 features a low 1.5I (max) on-resistance and 3mI (typ) flatness to maximize signal integrity over the entire common-mode voltage range. Each multiplex- er can carry up to 300mA of continuous current through the multiplexer in either direction. The MAX14778 supports switching of full-speed USB 1.1 signals (12Mbps) and RS-485 data rates of up to 20Mbps. The MAX14778 is available in a 20-pin (5mm x 5mm) TQFN package and is specified over the -40NC to +85NC extended temperature range. Applications RS-485/RS-232/USB 1.1 Multiplexing POS Peripherals Handheld Industrial Devices Communication Systems Audio/Data Multiplexing Connector Sharing Gaming Machines Features S ±25V Signal Range S Single 3.0V to 5.5V Supply S Two Independent Multiplexers S 1.5I RON (max) S 3mI RON Flatness (typ) S 300mA Maximum Current Through Multiplexer S 78pF Input Capacitance S 75MHz Large-Signal Bandwidth S Break-Before-Make Operation S Extended ESD Protection on A_ and B_ Pins  Q6kV Human Body Model (HBM) Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX14778.related. Functional Diagram ENA SA0 SA1 CONTROL A A0 A1 A2 A3 B0 B1 B2 B3 VDD BIAS GENERATION MAX14778 VP VN ACOM BCOM CONTROL B ENB SB0 SB1 GND �� Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Free Datasheet http://www.datasheet4u.com/ 1 page MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Test Circuits/Timing Diagrams (continued) LOGIC INPUT MAX14778 VIN A_ B_ ACOM BCOM ENA ENB RL VOUT CL CL INCLUDES FIXTURE AND STRAY CAPACITANCE. ( )VOUT = VIN RL RL + RON LOGIC INPUT VIH VIL SWITCH 0V OUTPUT tR < 20ns tF < 20ns 50% tOFF VOUT 0.9 x V0UT tON 0.1 x VOUT Figure 3. Turn-On/Turn-Off Timing LOGIC INPUT VIN +5V 1µF VDD SA0 ENA MAX14778 SA1 +5V LOGIC INPUT 0V VOUT A_ ACOM VOUT SWITCH OUTPUT GND RL CL 0V CL INCLUDES FIXTURE AND STRAY CAPACITANCE. ( )VOUT = VIN RL RL + RON Figure 4. Break-Before-Make Timing tR < 20ns 80% tBBM �� Maxim Integrated Products 5 Free Datasheet http://www.datasheet4u.com/ 5 Page MAX14778 Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer Non-Powered Condition The MAX14778 can tolerate input voltages on the A_, B_, ACOM, and BCOM pins in the ±25V range when it is not powered. When VDD = 0V, the DC input leakage current into the A_, B_, ACOM or BCOM pins will typically be below 1µA. Some devices can have a larger leakage current up to mA range due to technology spread. With VDD not powered, internal diodes between the ana- log pins and the VP and VN will charge up the external capacitors on VP and VN when positive and/or negative voltages are applied to these pins. This causes transient input current flow. Large dv/dt on the inputs causes large capacitive charg- ing currents, which have to be limited to the 300mA Absolute Maximum Ratings in order to not destroy the internal diodes. With 100nF capacitors on VP and VN, the dv/dt must be limited to 3V/µs once the capacitors reach their final voltage; the input current decays to the leakage current levels mentioned above. High-ESD Protection Electrostatic discharge (ESD)-protection structures are incorporated on all pins to protect against electrostatic discharges up to Q2kV Human Body Model (HBM) encountered during handling and assembly. A_ and B_ are further protected against ESD up to Q6kV (HBM) without damage. The ESD structures withstand high ESD both in normal operation and when the device is powered down. After an ESD event, the MAX14778 continues to function without latchup. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. The MAX14778 requires a 100nF capacitor on both VP and VN to GND to guarantee full ESD protection. Human Body Model Figure 7 shows the Human Body Model. Figure 8 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5kI resistor. RC 1MI CHARGE CURRENT- LIMIT RESISTOR HIGH- VOLTAGE DC SOURCE CS 100pF RD 1.5kI DISCHARGE RESISTANCE STORAGE CAPACITOR Figure 7. Human Body ESD Test Model DEVICE UNDER TEST IP 100% 90% AMPERES 36.8% 10% 0 0 tRL Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) TIME tDL CURRENT WAVEFORM Figure 8. Human Body Current Waveform �� Maxim Integrated Products 11 Free Datasheet http://www.datasheet4u.com/ 11 Page

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