Datasheet

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LTC1383

1383fa

5V Low Power

RS232 Transceiver

■

Operates from a Single 5V Supply

■

Low Supply Current: I

= 220µA

■

ESD Protection Over ±10kV

■

Available in 16-Pin SOIC Narrow Package

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Uses Small Capacitors: 0.1µF

■

Operates to 120kBaud

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Output Overvoltage Does Not Force Current

Back into Supplies

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RS232 I/O Lines Can Be Forced to ±25V

Without Damage

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Pin Compatible with LT1181A and MAX232A

The LTC

1383 is an ultra-low power 2-driver/2-receiver

RS232 transceiver that operates from a single 5V

supply. The charge pump requires only four space-

saving 0.1µF capacitors. The supply current (I

) of the

transceiver is only 220µA with driver outputs unloaded.

The LTC1383 is fully compliant with all data rate and

overvoltage RS232 specifications. The transceiver can

operate up to 120kbaud with a 2500pF, 3kΩ load. Both

driver outputs and receiver inputs can be forced to

±25V without damage and can survive multiple ±10kV

ESD strikes.

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Notebook Computers

■

Palmtop Computers

Quiescent Supply Current vs Temperature

TEMPERATURE (°C)

–20

QUIESCENT CURRENT (µA)

100

200

300

400

600

20 40 60

LTC1383 • TA02

500

TEST CONDITION: V

= 5V

QUIESCENT

CURRENT

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

LTC1383 • TA01

LTC1383

0.1µF

= 5V

0.1µF

232 OUTPUT

232 INPUT

LOGIC INPUT

LOGIC OUTPUT

300k

Summary of content (8 pages)

PAGE 1
LTC1383 5V Low Power RS232 Transceiver U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LTC®1383 is an ultra-low power 2-driver/2-receiver RS232 transceiver that operates from a single 5V supply. The charge pump requires only four spacesaving 0.1µF capacitors. The supply current (ICC) of the transceiver is only 220µA with driver outputs unloaded. Operates from a Single 5V Supply Low Supply Current: ICC = 220µA ESD Protection Over ±10kV Available in 16-Pin SOIC Narrow Package Uses Small Capacitors: 0.
PAGE 2
LTC1383 W W W AXI U U ABSOLUTE RATI GS Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... – 0.3V to V CC + 0.3V Receiver ............................................... – 25V to 25V Digital Input ............................... – 0.3V to VCC + 0.3V Output Voltage Driver .................................................... – 25V to 25V Receiver .................................... – 0.3V to VCC + 0.
PAGE 3
LTC1383 DC ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted. PARAMETER Power Supply VCC Supply Current CONDITIONS No Load (Note 2), 0°C to 70°C No Load (Note 2), – 40°C to 85°C MIN TYP MAX UNITS 0.5 1.0 0.8 2.0 0.22 0.35 1.4 1.
PAGE 4
LTC1383 U W TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current vs Temperature Driver Output Waveforms Receiver Output Waveforms 18 DRIVER OUTPUT RL = 3k CL = 2500pF SUPPLY CURRENT (mA) 16 14 12 DRIVER OUTPUT RL = 3k 2 DRIVERS LOADED RL = 3k 10 RECEIVER OUTPUT CL = 51pF INPUT 8 1 DRIVER LOADED RL = 3k 6 INPUT 4 LTC1383 • TPC05 2 5µs/DIV LTC1383 • TPC06 5µs/DIV 0 0 10 20 30 40 50 TEMPERATURE (°C) 60 70 LTC1383 • TPC04 U U U PI FU CTIO S VCC: 5V Input Supply Pin.
PAGE 5
LTC1383 U W W SWITCHI G TI E WAVEFOR S DRIVER INPUT VCC 1.4V 1.4V 0V V+ DRIVER OUTPUT 0V 0V t LHD RX OUTPUT V– VCC 1.7V RX INPUT 1.3V 2.4V 0.8V t LHR t HLD 0V t HLR VCC 0V LTC1383 • F02 LTC1383 • F01 Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing TEST CIRCUITS Receiver Timing Test Load Driver Timing Test Load DRIVER INPUT DRIVER OUTPUT RX OUTPUT RX INPUT DRIVER 51pF RX 51pF 3k LTC1383 • TA04 LTC1383 • TA03 ESD Test Circuit 0.
PAGE 6
LTC1383 U TYPICAL APPLICATIO S Paralleling Power Supply Generator with Common Storage Capacitors 0.1µF 1 16 3 2 4 0.1µF LOGIC INPUT 5 LTC1383 VCC = 5V 0.1µF 6 0.1µF VCC 300k 14 11 0.1µF 232 OUTPUT 1 16 3 2 4 0.
PAGE 7
LTC1383 U PACKAGE DESCRIPTIO N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .770* (19.558) MAX 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 ) .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .020 (0.508) MIN .065 (1.651) TYP .120 (3.048) MIN .100 (2.54) BSC NOTE: 1.
PAGE 8
LTC1383 U PACKAGE DESCRIPTIO S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 15 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 6 7 8 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.