LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS
D Single-Chip TIA/EIA-232-F Interface for
IBM™ PC/AT™ Serial Port
D Designed to Transmit and Receive 4-µs
Pulses (Equivalent to 256 kbit/s)
D Less Than 21-mW Power Consumption
D Wide Supply-Voltage Range, 4.75 V to 15 V
D Driver Output Slew Rates Are Internally
Controlled to 30 V/µs Max
D Receiver Input Hysteresis, 1000 mV Typ
D TIA/EIA-232-F Bus-Pin ESD Protection
– 15-kV, Human-Body Model
– 15-kV IEC1000-4-2, Air Gap
– 8-kV IEC1000-4-2, Contact
D Three Drivers and Five Receivers Meet or
Exceed the Requirements of TIA/EIA-232-F
and ITU V.28
D Complements the SN75LP196
D Designed to Replace the Industry-Standard
SN75185 and SN75C185 With the Same
D Packaged in Plastic Small-Outline Package
SLLS257G – AUGUST 1996 – REVISED SEPTEMBER 1998
The SN75LP185A 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 SN75LP185A allows easy interconnection of the
UART and serial-port connector of the IBM PC/AT and compatibles. The SN75LP185A provides a rugged,
low-cost solution for this function with the combination of the bipolar processing and 15 kV of ESD protection.
The SN75LP185A has internal slew-rate control to provide a maximum rate of change in the output signal of
30 V/µs. 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 SN75LP185A 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 SN75LP185A support rates up to 256 kbit/s.
The SN75LP185A is characterized for operation from 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
IBM and PC/AT are trademarks of International Business Machines Corporation.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1998, Texas Instruments Incorporated
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