MaxLinear SP3485EN L TR RS 485 3.3V 10Mbps RS 422 Interface IC

Product Specification

BMA253 Accelerometer Digital Triaxial Acceleration Sensor   

                                                                     Description

The SP3485 is a member in the family of 3.3V low power halfduplex transceivers that meet the electrical specifications of the RS-485 and RS-422 serial protocols. This device is pinto-pin compatible with the MaxLinear SP481, SP483 and SP485 devices as well as popular industry standards. The SP3485 feature MaxLinear’s BiCMOS process allowing low power operationwithout sacrificing performance. Driver The driver outputs of the SP3485 are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 volts to 3.3 Volts. With a load of 54Ω across the differential outputs, the drivers can maintain greater than 1.5V voltage levels. The driver of the SP3485 has a driver enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on the DE (pin 3) will tri-state the driver outputs. The driver of the SP3485 operates up to 10Mbps. The 250mA ISC maximum limit on the driver output allows the SP3485 to withstand an infinite short circuit over the -7.0V to 12V common mode range without catastrophic damage to the IC. Receiver The SP3485 receiver has differential inputs with an input sensitivity of ±200mV. Input impedance of the receiver is 12kΩ minimum. A wide common mode range of -7V to 12V allows for large ground potential differences between systems. The receiver is equipped with a fail-safe feature that guarantees the receiver output will be in a HIGH state when the input is left unconnected. The receiver of the SP3485 operates up to 10Mbps. The receiver of the SP3485 has an enable control line which is active LOW. A logic LOW on RE (pin 2) will enable the differential receiver. A logic HIGH on RE (pin 2) of the SP3485 will disable the receiver

                                                     Low Power Shutdown Mode

Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the devices typically draw only 50nA of supply current. RE and DE can be driven simultaneously; the part is guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown. Enable times tPRZH, tPZH, tPRZL and tPZL assume the part was not in a low-power shutdown state. Enable times tPRSH, tPSH, tPRSL and tPSL assume the parts were shut down. It takes drivers and receivers longer to become enabled from low-power shutdown mode (tPRSH, tPSH, tPRSL, tPSL) than from driver/receiver-disable mode (tPRZH, tPZH, tPRZL, tPZL

                                                       1. Description
The SP3485 device is a 3.3V low power half-duplex transceiver that
meets the specifications of the RS-485 and RS-422 serial protocols.
This device is pin-to-pin compatible with the MaxLinear SP481,
SP483 and SP485 devices as well as popular industry standards. The
SP3485 can meet the electrical specifications of the RS-485 and RS422
serial protocols up to 10Mbps under load

                                                           2.   FEATURES

■ RS-485 and RS-422 transceiver ■ Operates from a single 3.3V supply ■ Interoperable with 5.0V logic ■ Driver/receiver enable ■ -7V to +12V common-mode input voltage range ■ Allows up to 32 transceivers on the serial bus ■ Compatibility with industry standard 75176 pinout ■ Driver output short-circuit protection

                                                           3.   Pin Functions

                                                                         4.    Test Circuits

                                                       5. Switching Waveforms

                                                           6.Mechanical Dimensions

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