Texas Instruments SN75LBC187DBLE, SN75LBC187DBR Datasheet

SN75LBC187

MULTICHANNEL EIA-232 DRIVER/RECEIVER

WITH CHARGE PUMP

SLLS130C – SEPTEMBER 1991 – REVISED MA Y 1995

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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-mil­Pitch 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

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.

Copyright  1995, 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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28
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18
17
16
15

DY3
DY1
DY2
RA2
RY2
DA2
DA1
RY1
RA1

GND

V

CC

C1+

V

DD

C1–

NC
RA3
RY3
SHUTDOWN
NC
RA4
RY4
NC
DA3
RY5
RA5
V

SS

C2–
C2+

DB PACKAGE

(TOP VIEW)

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.

LinBiCMOS and LinASIC are a trademarks of Texas Instruments Incorporated.

SN75LBC187
MULTICHANNEL EIA-232 DRIVER/RECEIVER
WITH CHARGE PUMP

SLLS130C – SEPTEMBER 1991 – REVISED MA Y 1995

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

20

6

7

19

22

26

5

8

17

13

1

3

2

18

23

27

4

9

16

15

14

12

GND

DA3

DA2

DA1

RY5

RY4

RY3

RY2

RY1

V

SS

V

DD

DY3

DY2

DY1

RA5

RA4

RA3

RA2

RA1

C2–

C2+

C1–

C1+

SHUTDOWN

–2 VCC +1.5 V

2 VCC –1.5 V

C2–

C2+

C1–

C1+

[PWR DOWN]

V

CC

11

10

25

†

This symbol is in accordance with ANSI/IEEE Std. 91-1984 and
IEC Publication 617-12.

logic diagram (positive logic)

SHUTDOWN

V

CC

V

SS

V

DD

Circuit

Capacitor

Switched-

RA5

RA4

DY3

RA3

DY2

RA2

DY1

RA1

RY5

RY4

DA3

RY3

DA2

RY2

DA1

RY1

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

‡

Supply voltage range, V

CC

(see Note 1) 0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Positive output supply voltage range, V

DD

V

CC

–0.3 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Negative output supply voltage range, V

SS

0.3 V to –15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, V

I

: RA ±30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

All other inputs –0.3 V to V

CC

+ 3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, V

O

:DY –2 VCC + 1.2 V to 2 VCC – 1.2 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

All other outputs –0.3 V to V

CC

+ 3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

A

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltages are with respect to the network ground terminal.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

DB 1025 mW 8.2 mW/°C 656 mW

SN75LBC187

MULTICHANNEL EIA-232 DRIVER/RECEIVER

WITH CHARGE PUMP

SLLS130C – SEPTEMBER 1991 – REVISED MA Y 1995

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V

CC

4.5 5 5.5 V

p

DA 2

High-level input voltage, V

IH

RA, SHUTDOWN 2.4

V

Low-level input voltage, V

IL

RA, DA, SHUTDOWN 0.8 V

Receiver input voltage, V

I

–25 25 V

High-level output current, I

OH

RY –1 mA

Low-level output current, I

OL

RY 3.2 mA

p

V

DD

±10 µA

Output current, I

O

V

SS

±10 µA
C1, C2, C3, C4 charge pump capacitors 0.1 0.47 µF
Operating free-air temperature, T

A

0 70 °C

electrical characteristics over recommended operating conditions (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

p

Receiver IO = –1 mA 3.5

VOHHigh-level output voltage

Driver RL = 3 kΩ to GND 5 7

V

p

Receiver IO = 3.2 mA 0.4

VOLLow-level output voltage

Driver RL = 3 kΩ to GND –7 –5

V

V

IT+

Receiver positive-going input voltage threshold 1.7 2.4 V

V

IT–

Receiver negative-going input voltage threshold 0.8 1.2 V

V

hys

Receiver input hysteresis voltage (V

IT+

– V

IT–

) 0.5 1 V

r

i

Receiver input resistance VCC = 5 V, TA = 25°C 3 5 7 kΩ

r

o

Driver output resistance VCC = 0, VO = ±2 V 300 Ω

I

I

Input current (DA, SHUTDOWN) VI = 0 to V

CC

±50 µA

I

OS

Driver output short-circuit current VO = 0 ±10 mA

pp

Normal operation All outputs open, SHUTDOWN at 2.4 V 15 30 mA

ICCSupply current

Shutdown mode All outputs open, SHUTDOWN at 0.1 V 10 µA

†

All typical values are at VCC = 5 V and TA = 25°C.