PDF MAX14780E Data sheet ( Hoja de datos )

Número de pieza	MAX14780E
Descripción	RS-485/RS-422 Transceiver
Fabricantes	Maxim Integrated Products
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No Preview Available ! MAX14780E +5.0V, ±30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver General Description The MAX14780E is a +5V, ±30kV HBM ESD half duplex RS-485/422 transceiver. The MAX14780E features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improp- erly terminated cables, allowing error-free data transmis- sion up to 500kbps. The MAX14780E is available in an 8-pin SO and PDIP packages operating over a temperature range from -40°C to +85°C. Utility Meters Lighting Systems Industrial Control Telecom Security Systems Instrumentation Applications Benefits and Features Integrated Protection Increases Robustness S ±30kV HBM ESD per JEDEC JS-001-2012 S ±12kV Contact ESD per IEC 61000-4-2 S ±15kV Air Gap ESD per IEC 61000-4-2 S True Fail-Safe Receiver Prevents False Transitions on Receiver Input Short or Open S Hot Swap Eliminates False Transitions During Power-Up or Hot Insertion S Short-Circuit Protected Outputs Low Current Reduces Power Consumption Low Current Reduces Power Consumption S 10µA Shutdown Current S 1.2mA of Supply Current When Unloaded Ordering Information PART TEMP RANGE PIN-PACKAGE MAX14780EESA+ -40NC to +85NC 8 SO MAX14780EEPA+ -40NC to +85NC 8 PDIP +Denotes a lead(Pb)-free/RoHS-compliant package. RO 1 + R RE 2 DE 3 DI 4 D Typical Operating Circuit 0.1µF 8 VCC 7B Rt 6 5A GND MAX14780E B Rt A TYPICAL HALF-DUPLEX OPERATING CIRCUIT DE D DI R RE RO For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-5652; Rev 3; 1/15 1 page MAX14780E +5.0V, ±30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver Test Circuits and Waveforms (continued) 0 OR VCC D GENERATOR 50Ω S1 OUT CL RL = 500Ω 50pF DE tDZH, tDZH(SHDN) OUT VOM = (0 + VOH)/2 Figure 4. Driver Enable and Disable Times (tDHZ, tDZH, tDZH(SHDN)) 0 OR VCC D GENERATOR 50Ω S1 VCC/2 0.25V tDHZ VCC 0 VOH 0 VCC RL = 500Ω OUT CL 50pF DE tDZL, tDZL(SHDN) VCC OUT VOM = (VOL + VCC)/2 VOL Figure 5. Driver Enable and Disable Times (tDZL, tDLZ, tDLZ(SHDN)) Maxim Integrated VCC/2 tDLZ VCC 0 0.25V 5 5 Page MAX14780E +5.0V, ±30kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceiver CMOS input. Whenever VCC drops below 1V, the hot- swap input is reset. For RE there is a complementary circuit employing two pMOS devices pulling RE to VCC. ±30kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver input of the MAX14780E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±30kV without dam- age. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, the MAX14780E keeps working without latchup or damage. ESD protection can be tested in various ways. The trans- mitter output and receiver input of the MAX14780E are characterized for protection to the following limits: • ±30kV using the Human Body Model • ±12kV using the Contact Discharge method specified in IEC 61000-4-2 • ±15kV using the Air-Gap Discharge method specified in IEC 61000-4-2 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. Human Body Model Figure 10a shows the Human Body Model, and Figure 10b shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. IEC 61000-4-2 The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The MAX14780E helps you design equipment to meet IEC 61000-4-2, with- out the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 61000-4-2 is higher peak current in IEC 61000-4-2 because series resistance is lower in the IEC 61000-4-2 model. Hence, the ESD withstand voltage measured to IEC 61000-4-2 is gen- erally lower than that measured using the Human Body Model. Figure 10c shows the IEC 61000-4-2 model, and Figure 10d shows the current waveform for IEC 61000‑4‑2 ESD Contact Discharge test. Machine Model The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. Of course, all pins require this protection, not just RS-485 inputs and outputs. RC 1MΩ CHARGE-CURRENT- LIMIT RESISTOR RD 1500Ω DISCHARGE RESISTANCE HIGH- VOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR Figure 10a. Human Body ESD Test Model DEVICE UNDER TEST IP 100% 90% AMPS 36.8% 10% 0 0 tRL Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) TIME tDL CURRENT WAVEFORM Figure 10b. Human Body Current Waveform Maxim Integrated 11 11 Page

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