SLLS256A - DECEMBER 1996 - REVISED FEBRUARY 1998
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The SN75LPE185 is a low-power bipolar device containing three drivers and five receivers with 15kV ESD protection on the bus pins. The pinout matches the flow-through design of the industry-standard SN75185, SN75C185, and SN75LP185 with the addition of four pins for control signals. The flow-through pinout of the device allows easy interconnection of the UART and serial-port connector of the IBM PC compatibles. The SN75LPE185 provides a rugged, low-cost solution for this function with the combination of bipolar processing and 15-kV ESD protection.
The SN75LPE185 has an internal slew-rate control to provide a maximum rate of change in the output signal of 30 V/us. The driver output swing is clamped at ±6 V to enable the higher data rates associated with this device and reduce EMI emissions. Although the driver outputs are clamped, the outputs can handle voltages up to ±15 V without damage.
The device has flexible control options for power management when the serial port is inactive. A common disable for all of the drivers and receivers is provided with the active-low enable (EN\) input. The mode control (MODE) input selects between the STANDBY and WAKE-UP modes. With a low-level input on the MODE pin and a high-level input on the EN\ pin, one receiver remains active while the remaining drivers and receivers are disabled to implement the WAKE-UP mode. With a high-level input on both the MODE and EN\ pins, all drivers and receivers are disabled to implement the STANDBY mode. The outputs of the drivers are in a high-impedance state when the device is powered off. To ensure the outputs of the receivers are in a known
output level (as listed in the Application Information section of this data sheet) when the device is powered off, in STANDBY, or WAKE-UP mode, external pullup/pulldown circuitry must be provided. All the logic inputs accept 3.3-V or 5-V input signals.
The SN75LPE185 complies with the requirements of ANSI EIA/TIA-232-F and ITU v.28 standards. These standards are for data interchange between a host computer and peripheral at signaling rates up to 20kbps. The switching speeds of the SN75LPE185 are fast enough to support rates up to 256 kbps.
The SN75LPE185 is characterized for operation from 0°C to 70°C.
View more information about generic part numbers:SN75LPE185
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