SN75LBC187 Datasheet, PDF (1/8 Pages) Texas Instruments – MULTICHANNEL EIA-232 DRIVER/RECEIVER WITH CHARGE PUMP

D Single IC and Single 5-V Supply Interface
for Serial Communication Ports
D Meets or Exceeds the Requirements of
ANSI Standards EIA/TIA-232-E-1991,
EIA/TIA-562, and ITU Recommendation V.28
D Switched-Capacitor Voltage Converter
Eliminates Need for ± 12-V Supplies
D Voltage Converter Operates With Low
Capacitance . . . 0.1 µF Min
D Designed for Data Rates up to 120 kb/s
Over 3-m Cable
D Available in Shrink Small-Outline 25-mil-
Pitch Package
D Shutdown Mode to Save Power When Not
in Use
D ± 30-V Receiver Input Voltage Range
D LinBiCMOS™ Process Technology
D Applications
– Laptop or Notebook Computers
– Portable Terminals
– Single-Board Computers
– Portable Test Equipment
SN75LBC187
MULTICHANNEL EIA-232 DRIVER/RECEIVER
WITH CHARGE PUMP
SLLS130C – SEPTEMBER 1991 – REVISED MAY 1995
DB PACKAGE
(TOP VIEW)
DY3 ₁
DY1 ₂
DY2 ₃
RA2 ₄
RY2 5
DA2 6
DA1 7
RY1 8
RA1 9
GND 10
V_CC 11
C1+ 12
V_DD 13
C1– ¹⁴
28 ^NC
27 ^RA3
26 ^RY3
25 ^SHUTDOWN
24 NC
23 RA4
22 RY4
21 NC
20 DA3
19 RY5
18 RA5
17 V_SS
16 C2–
15 _C2+
NC – No internal connection
description
The 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.
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.
LinBiCMOS and LinASIC are a trademarks of Texas Instruments Incorporated.
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.
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Copyright © 1995, Texas Instruments Incorporated
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