Datasheet

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R1OUT

T1IN

V+

V-

C1+

C1-

C2+

C2-

0.1µF

+10V

0.1µF

6.3V

+5V INPUT

C1 =

C2 =

C3 =

C4 =

Cbp =

0.1µF

6.3V

0.1µF

16V

0.1µF

16V

-10V

T2IN

R2OUT

R2IN

R1IN

T1OUT

T2OUT

GND

OBSOLETE

LMS202

www.ti.com

SNLS166E –DECEMBER 2002–REVISED APRIL 2013

LMS202 5V Single Supply TIA/EIA-232 Dual Transceivers

Check for Samples: LMS202

FEATURES

DESCRIPTION

The LMS202 features two transmitters and two

• Single +5V Power Supply

receivers for RS-232 communication. It has a DC-to-

• 230 kbps Data Rate

DC converter that permits the device to operate with

• On-Board DC-to-DC Converter

only a single +5V power supply. The on-chip DC-to-

DC converter which utilizes four external 0.1μF

• 0.1μF Charge Pump Capacitors

capacitors to generate dual internal power supplies

• Drop-In Replacement to Maxim’s MAX202

for RS-232 compatible output levels.

The device meet EIA/TIA-232E and CCITT V.28

APPLICATIONS

specifications up to 230kbits/sec. The LMS202 is

• POS Equipment (Bar Code Reader)

available in 16-pin narrow and wide SOIC packages.

• Hand-Held Equipment

• General Purpose RS-232 Communication

Connection Diagram and Typical Circuit

Figure 1. 16-Pin SOIC

See D or DW Package

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (7 pages)

PAGE 1
OBSOLETE LMS202 www.ti.com SNLS166E – DECEMBER 2002 – REVISED APRIL 2013 LMS202 5V Single Supply TIA/EIA-232 Dual Transceivers Check for Samples: LMS202 FEATURES DESCRIPTION • • • • • The LMS202 features two transmitters and two receivers for RS-232 communication. It has a DC-toDC converter that permits the device to operate with only a single +5V power supply. The on-chip DC-toDC converter which utilizes four external 0.
PAGE 2
OBSOLETE LMS202 SNLS166E – DECEMBER 2002 – REVISED APRIL 2013 www.ti.com PIN DESCRIPTIONS Pin Number Pin Name Pin Function 1, 3 C1+, C1− External capacitor connection pins. Recommended external capacitor C1 = 0.1μF (6.3V) 2 V+ Positive supply for TIA/EIA-232E drivers. Recommended external capacitor C4 = 0.1μF (6.3V) 4, 5 C2+, C2− External capacitor connection pins. Recommended external capacitor C2 = 0.1μF (16V) 6 V− Negative supply for TIA/EIA-232E drivers.
PAGE 3
OBSOLETE LMS202 www.ti.com SNLS166E – DECEMBER 2002 – REVISED APRIL 2013 Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1μF Symbol Parameter Conditions Min (1) Typ (2) Max (1) Units 1 7 mA DC Characteristics IS Supply Current No Load, TA = 25°C IINPUT Input Leakage Current TIN = 0V to VS ±10 μA VTHL Input Logic Theshold Low TIN 0.
PAGE 4
OBSOLETE LMS202 SNLS166E – DECEMBER 2002 – REVISED APRIL 2013 www.ti.com Typical Characteristics 9 Transmitter Slew Rate vs. Load Capacitance 14 All Transmitters Loaded Data Rate = 120kbps VS = 5.5V All Transmitters Loaded Data Rate = 120kbps 12 RL = 3k: 8 SLEW RATE (V/µs) TRANSMITTER OUTPUT HIGH VOLTAGE VOH (V) Transmitter Output High Voltage vs. Load Capacitance 7 VS = 5V VS = 4.
PAGE 5
OBSOLETE LMS202 www.ti.com SNLS166E – DECEMBER 2002 – REVISED APRIL 2013 APPLICATION INFORMATION CAPACITOR SELECTION The recommended capacitors are 0.1μF. However, larger capacitors for the charge pump may be used to minimized ripples on V+ and V− pins. POWER SUPPLY DECOUPLING In some applications that are sensitive to power supply noise from the charge pump, place a decoupling capacitor, Cbp, from VS to GND. Use at least a 0.1µF capacitor or the same size as the charge pump capacitors (C1 − C4).
PAGE 6
OBSOLETE LMS202 SNLS166E – DECEMBER 2002 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision D (April 2013) to Revision E • 6 Page Changed layout of National Data Sheet to TI format ............................................................................................................
PAGE 7
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.