SN75LP1185 Low-Power Multiple RS-232 Drivers and Receivers |


Low-Power Multiple RS-232 Drivers and Receivers

Low-Power Multiple RS-232 Drivers and Receivers - SN75LP1185


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 0°C to 70°C.


  • Single-Chip TIA/EIA-232-F Interface for IBMTM PC/ATTM Serial Port
  • Designed to Transmit and Receive 4-us Pulses (Equivalent to 256 kbit/s)
  • Less Than 21-mW Power Consumption
  • Wide Supply-Voltage Range...4.75 V to 15V
  • Driver Output Slew Rates Are Internally Controlled to 30 V/us Max
  • Receiver Input Hysteresis...1000 mV Typical
  • TIA/EIA-232-F Bus-Pin ESD Protection Exceeds:
    • 15-kV, Human-Body Model
  • Three Drivers and Five Receivers Meet or Exceed the Requirements of TIA/EIA-232-F and ITU V.28
  • Complements the SN75LP196
  • Designed to Replace the Industry-Standard SN75185 and SN75C185 With the Same Flow-Through Pinout
  • Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Dual-In-Line (N) Packages

IBM and PC/AT are trademarks of International Business Machines Corporation.


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Part number Order Drivers per package Receivers per package Logic voltage (Min) (V) Data rate (Max) (kbps) Main supply voltage (Nom) (V) ESD HBM (kV) Rating Operating temperature range (C) Package Group
SN75LP1185 Order now 3     5     5     256     5     15     Catalog     0 to 70     SOIC | 20
SSOP | 20    
SN75LBC241 Order now 4     5     5     100     5     0     Catalog     0 to 70     SOIC | 28