Texas Instruments SN75LP1185

LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS

The SN75LP1185 is a low-power bipolar device containing three drivers and five receivers, with 15 kV of ESD protection on the bus pins with respect to each other. Bus pins are defined as those pins that tie directly to the serial-port connector, including GND. The pinout matches the flow-through design of the industry-standard SN75185 and SN75C185. The flow-through pinout of the SN75LP1185 allows easy interconnection of the UART and serial-port connector of the IBM PC/AT and compatibles. The SN75LP1185 provides a rugged, low-cost solution for this function with the combination of the bipolar processing and 15 kV of ESD protection. The SN75LP1185 has internal slew-rate control to provide a maximum rate of change in the output signal of 30 V/us. The driver output swing is nominally clamped at 6 V to enable the higher data rates associated with this device and to reduce EMI emissions. Even though the driver outputs are clamped, they can handle voltages up to 15 V without damage. All the logic inputs can accept 3.3-V or 5-V input signals. The SN75LP1185 complies with the requirements of TIA/EIA-232-F and ITU V.28. These standards are for data interchange between a host computer and peripheral at signaling rates up to 20 kbit/s. The switching speeds of the SN75LP1185 support rates up to 256 kbit/s. The SN75LP1185 is characterized for operation from 0C to 70C.