PDF MAX14782E Data sheet ( Hoja de datos )

Número de pieza	MAX14782E
Descripción	500Kbps 3.3V to 5V RS-485/RS-422 Transceiver
Fabricantes	Maxim Integrated
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No Preview Available ! MAX14782E EVALUATION KIT AVAILABLE 500Kbps 3.3V to 5V RS-485/RS-422 Transceiver with ±35kV HBM ESD Protection General Description The MAX14782E is a 3.3V to 5V ESD-protected trans- ceiver intended for half-duplex RS-485/RS-422 com- munication up to 500kbps. The device is optimized for extended cable runs while maximizing tolerance to noise. The MAX14782E integrated protection features include short-circuit-protected outputs, hot-swap functionality, and a true fail-safe receiver, guaranteeing a logic-high receiver output when inputs are shorted or open. Hot- swap capability eliminates undesired transitions on the bus during power-up or hot insertion. The transceiver draws 1.9mA (typ) supply current when unloaded or when fully loaded with the drivers disabled and draws less than 10µA (max) of supply current in low- power shutdown mode. The MAX14782E is available in 8-pin µMAX®, 8-pin SO, and small, 8-pin (3mm x 3mm) TDFN-EP packages. All packages operate over the -40°C to +125°C temperature range. Applications ● Motion Controllers ● Field Bus Networks ● Encoder Interfaces ● Backplane Buses Benefits and Features ● Integrated Protection Increases Robustness • High ESD Protection ±35kV HBM ESD ±20kV Air Gap IEC 61000-4-2 ESD ±12kV Contact IEC 61000-4-2 ESD • Short-Circuit-Protected Outputs • True Fail-Safe Receiver • Hot-Swap Capability ● 3V to 5.5V Supply Voltage Range ● Data Rates up to 500kbps ● -40°C to +125°C Operating Temperature ● Allows Up to 32 Transceivers On the Bus ● Low 10µA (max) Shutdown Current ● Saves Board Space • Available in 8-pin µMAX, SO, and TDFN-EP Packages Ordering Information/Selector Guide PART SUPPLY RANGE DATA RATE (MAX) MAX14782EASA+ MAX14782EATA+ 3.0V to 5.5V 3.0V to 5.5V 500kbps 500kbps MAX14782EAUA+ 3.0V to 5.5V 500kbps µMax is a registered trademark of Maxim Integrated Products, Inc. +Denotes lead(Pb)-free/RoHS-compliant package. EP = Exposed paddle. TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 8 SO 8 TDFN-EP 8 µMAX 19-6776; Rev 0; 8/13 1 page MAX14782E 500Kbps 3.3V to 5V RS-485/RS-422 Transceiver with ±35kV HBM ESD Protection Switching Characteristics MAX14782E (continued) (VCC = +3V to +5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = +5V and TA = +25°C.) (Notes 2, 3, 5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Driver Enable from Shutdown to Output Low tDHZ(SHDN) RL = 110Ω, CL = 15pF, Figures 4 and 5 (Note 6) 5.5 µs Time to Shutdown RECEIVER Receiver Propagation Delay Receiver Output Skew Maximum Data Rate Receiver Enable to Output High tSHDN (Note 7) tRPLH tRPHL tRSKEW DRMAX tRZH CL = 15pF, Figures 6 and 7 CL = 15pF, Figures 6 and 7 (Note 6) RL = 1kΩ, CL = 15pF, Figure 8 (Note 6) 50 340 500 700 200 200 30 50 ns ns ns kbps ns Receiver Enable to Output Low Receiver Disable Time from Low Receiver Disable Time from High Receiver Enable from Shutdown to Output High tRZL tRLZ tRHZ tRLZ(SHDN) RL = 1kΩ, CL = 15pF, Figure 8 (Note 6) RL = 1kΩ, CL = 15pF, Figure 8 RL = 1kΩ, CL = 15pF, Figure 8 RL = 1kΩ, CL = 15pF, Figure 8 (Note 6) 50 ns 50 ns 50 ns 5.5 µs Receiver Enable from Shutdown to Output Low tRHZ(SHDN) RL = 1kΩ, CL = 15pF, Figure 8 (Note 6) 5.5 µs Time to Shutdown tSHDN (Note 7) 50 340 700 ns Note 2: All devices 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 3: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to ground, unless otherwise noted. Note 4: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 5: Capacitive load includes test probe and fixture capacitance. Note 6: Guaranteed by design; not production tested. Note 7: The timing parameter refers to the driver or receiver enable delay, when the device has exited the initial hot-swap protect state and is in normal operating mode. www.maximintegrated.com Maxim Integrated │ 5 5 Page MAX14782E 500Kbps 3.3V to 5V RS-485/RS-422 Transceiver with ±35kV HBM ESD Protection Pin Configuration VCC B 87 A GND 65 MAX14782E + EP 1 234 RO RE DE DI TDFN-EP CONNECT EXPOSED PAD (EP) TO GND TOP VIEW RO 1 + RE 2 DE 3 MAX14782E DI 4 µMAX/SO 8 VCC 7B 6A 5 GND Pin Description PIN NAME 1 RO 2 RE 3 DE 4 DI 5 GND 6A 7B 8 VCC — EP Receiver Output. See Function Tables. FUNCTION Receiver Output Enable. Drive RE low to enable RO. Drive RE high to disable the receiver. RO is high impedance when RE is high. Drive RE high and pull DE low to enter low-power shutdown mode. Driver Output Enable. Drive DE high to enable the driver. Drive DE low to disable the driver. Driver outputs are high-impedance when the driver is disabled. Drive RE high and pull DE low to enter low- power shutdown mode. Driver Input. With DE high, a low on DI forces the A output low and the B output high. Similarly, a high on DI forces the A output high and B output low. Ground Noninverting RS-485/RS-422 Receiver Input and Driver Output Inverting RS-485/RS-422 Receiver Input and Driver Output Positive Supply Voltage Input. Bypass VCC with a 0.1µF ceramic capacitor to ground. Exposed Pad (TDFN only). Connect EP to GND. www.maximintegrated.com Maxim Integrated │ 11 11 Page

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