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SN75LBC187
Multichannel EIA-232 Driver/Receiver With Charge Pump
Switched-Capacitor Voltage ConverterEliminates Need for ±12-V Supplies Voltage Converter Operates With Low
Capacitance... 0.1 μF Min Designed for Data Rates up to 120 kb/s
Over 3-m Cable Available in Shrink Small-Outline 25-mil-
Pitch Package Shutdown Mode to Save Power When Not
in Use ±
30-V Receiver Input Voltage Range LinBiCMOS Process Technology Applications
– Laptop or Notebook Computers
– Portable Terminals
– Single-Board Computers
– Portable Test Equipment
descriptionThe SN75LBC187 is a low-power LinBiCMOS device containing three drivers, five receivers, and a
switched-capacitor voltage converter. The SN75LBC187 provides a single chip and single 5-V supply interface
between the asynchronous communications element and the serial port connector of the data terminal
equipment (DTE). This device has been designed to conform to ANSI Standards EIA/TIA-232-E, EIA/TIA-562,
and ITU recommendation V.28.
The switched-capacitor voltage converter of the SN75LBC187 uses four small external capacitors to generate
the positive and negative voltages required by EIA/TIA-232-E (and V.28) line drivers from a single 5-V input.
The drivers feature output slew-rate limiting to eliminate the need for external filter capacitors. The receivers
can accept ±30 V without damage. The device also features a reduced power or shutdown mode that cuts the
quiescent power to the IC when not transmitting data between the CPU and peripheral.
The SN75LBC187 has been designed using LinBiCMOS technology and cells contained in the Texas
Instruments LinASIC library. The SN75LBC187 is characterized for operation from 0°C to 70°C.
NOTE:This device includes circuit designs and process technologies that have patents pending.
DY2
RA2
RY2
DA2
DA1
RY1
RA1
GND
VCC
C1+
VDD
C1–
RY3
SHUTDOWN
RA4
RY4
DA3
RY5
RA5
VSS
C2–
C2+
NC–No internal connection
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.
