DESCRIPTIO Supply Current: 300µA Receivers Kept Alive SHUTDOWN Pr

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DESCRIPTIO Supply Current: 300µA Receivers Kept Alive SHUTDOWN Pr

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LTC1349 Power RS232 3-Driver/5-Receiver Transceiver with Receivers Active SHUTDOWN FEATURES
DESCRIPTIO
Supply Current: 300µA Receivers Kept Alive SHUTDOWN Protection Over ±10kV Operates from Single Supply Uses Small Capacitors: 0.1µF Operates 120k Baud Three-State Outputs High Impedance When Output Overvoltage Does Force Current Back into Supplies RS232 Lines Forced ±25V Without Damage Compatible with LT1137A LT1237 Flowthrough Architecture
LTC1349 3-driver/5-receiver RS232 transceiver with very supply current. load condition, supply current only 300µA. charge pump only requires four 0.1µF capacitors. SHUTDOWN mode, receivers kept alive supply current 35µA. RS232 outputs assume high impedance state SHUTDOWN with power off. LTC1349 fully compliant with data rate overvoltage RS232 specifications. transceiver operate 120k baud with 2500pF, load. Both driver outputs receiver inputs forced ±25V without damage, survive multiple ±10kV strikes.
APPLICATI
Notebook Computers Palmtop Computer
TYPICAL APPLICATI
0.1µF 0.1µF DRIVER DRIVER DRIVER ON/OFF
3-Drivers/5-Receivers with SHUTDOWN
LTC1349 0.1µF DRIVER DRIVER DRIVER
LTC1349 TA01
Quiescent SHUTDOWN Supply Current Temperature
0.1µF
1200 1000
QUIESCENT CURRENT (µA)
TEMPERATURE (°C) TEST CONDITION: DRIVER INPUTS TIED VCC.
LTC1349 TA02
SHUTDOWN CURRENT (µA)
SHUTDOWN CURRENT
QUIESCENT CURRENT
LTC1349 ABSOLUTE RATI
PACKAGE/ORDER ATIO
VIEW
Supply Voltage (VCC) Input Voltage Driver 0.3V 0.3V Receiver On/Off 0.3V 0.3V Output Voltage Driver Receiver 0.3V 0.3V Short Circuit Duration Driver Output Indefinite Receiver Output Indefinite Operating Temperature Range Commercial (LTC1349C) 70°C Industrial (LTC1349I) 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1349CG LTC1349CN LTC1349CS LTC1349IG LTC1349IN LTC1349IS
ON/OFF
PACKAGE PACKAGE 28-LEAD PLASTIC 28-LEAD SSOP PACKAGE 28-LEAD PLASTIC
TJMAX 125°C, 96°C/W TJMAX 125°C, 56°C/W TJMAX 125°C, 85°C/W
Consult factory Military Grade parts.
ELECTRICAL CHARACTERISTICS 0.1µF, unless otherwise noted.
PARAMETER Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current Power Supply Generator Output Voltage Output Voltage Supply Rise Time CONDITIONS Input Level (VOUT High) Input High Level (VOUT Low) VOUT SHUTDOWN, VOUT ±20V (Note Input Threshold Input High Threshold Output Low, IOUT 1.6mA (VCC Output High, IOUT 160µA (VCC Sinking Current, VOUT SHUTDOWN, VOUT (Note IOUT IOUT 12mA IOUT IOUT 12mA SHUTDOWN Turn-On Positive Negative
UNITS
±500
LTC1349
ELECTRICAL CHARACTERISTICS 0.1µF, unless otherwise noted.
PARAMETER Power Supply Supply Current CONDITIONS Load (All Drivers VCC)(Note 70°C Load (All Drivers 0V)(Note 70°C Load (All Drivers VCC)(Note 85°C Load (All Drivers VCC)(Note 40°C Load (All Drivers 0V)(Note 40°C 85°C SHUTDOWN (Note
UNITS
Supply Leakage Current (VCC) On/Off Threshold On/Off Threshold High
CHARACTERISTICS 0.1µF, unless otherwise noted.
PARAMETER Slew Rate Driver Propagation Delay (TTL RS232) Receiver Propagation Delay (RS232 TTL) CONDITIONS 51pF 2500pF (Figure (Figure (Figure (Figure
UNITS V/µs V/µs
denotes specifications which apply over operating temperature range (0°C 70°Cfor commercial grade, 40°C 85°C industrial grade). Note Absolute Maximum Ratings those values beyond which life device impaired.
Note Supply current measured with driver receiver outputs unloaded. Note Supply current leakage current measurements SHUTDOWN performed with VON/OFF
TYPICAL PERFOR CHARACTERISTICS
Driver Output Voltage
DRIVER OUTPUT VOLTAGE
OUTPUT HIGH
THRESHOLD VOLTAGE
TEMPERATURE (°C) OUTPUT 4.5V
SUPPLY CURRENT (mA)
4.5V
LTC1349 TPC01
Receiver Input Threshold2.2 TEMPERATURE (°C)
Supply Current Data Rate
2500pF DRIVERS ACTIVE
DATA RATE BAUD)
LTC1349 TPC02
LTC1349 TPC03
LTC1349
TYPICAL PERFOR CHARACTERISTICS
Supply Current
DRIVERS LOADED
LEAKAGE CURRENT (µA)
SUPPLY CURRENT (mA)
VOUT VOUT -20V
SHORT-CIRCUIT CURRENT (mA)
DRIVER LOADED
TEMPERATURE (°C)
LTC1349 TPC04
Receiver Short-Circuit Current
SHORT-CIRCUIT CURRENT (mA)
ISC-
ISC+
LTC1349 TPC08 LTC1349 TPC09
TEMPERATURE (°C)
CTIO
VCC: Input Supply Pin. Supply current typically 35µA SHUTDOWN mode. This should decoupled with 0.1µF ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible SHUTDOWN Pin. logic puts device SHUTDOWN mode, with receivers kept alive supply current equal 35µA. driver outputs other receiver outputs high impedance state. This float. Positive Supply Output (RS232 Drivers). 2VCC This requires external capacitor 0.1µF charge storage. capacitor tied ground With multiple devices, pins paralleled into common capacitors. large numbers devices, increasing size shared common storage capacitors recommended reduce ripple. Negative Supply Output (RS232 Drivers). 2VCC 1.5V. This requires external capacitor 0.1µF charge storage. C1+, C1-, C2+, C2-: Commutating Capacitor Inputs. These pins require external capacitors 0.1µF: from C1-, another from C2-. maintain charge pump efficiency, capacitor's effective series resistance should less than
LTC1349 TPC07
Driver Leakage SHUTDOWN
Driver Short-Circuit Current
ISC- ISC+
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1349 TPC05
LTC1349 TPC06
Driver Output WaveformDRIVER OUTPUT 2500pF DRIVER OUTPUT INPUT
Receiver Output Waveform
RECEIVER OUTPUT 2500pF
INPUT
LTC1349 CTIO
DRIVER RS232 Driver Input Pins. Inputs TTL/ CMOS compatible. Inputs should allowed float. unused inputs VCC. DRIVER OUT: Driver Outputs RS232 Voltage Levels. Outputs high impedance state when SHUTDOWN mode driver outputs protected against ±10kV human body model discharges. Receiver Inputs. These pins forced ±25V without damage. receiver inputs protected against ±10kV human body model discharges. Each receiver provides 0.4V hysteresis noise immunity. OUT: Receiver Outputs with TTL/CMOS Voltage Levels. Receiver outputs high impedance state when SHUTDOWN mode allow data line sharing. Receivers kept alive SHUTDOWN.
SWITCHI WAVEFOR
DRIVER INPUT DRIVER OUTPUT 1.4V 1.4V
LTC1349
Figure Driver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF
DRIVER INPUT
LTC1349 TA03
INPUT OUTPUT
1.7V
1.3V 2.4V 0.8V
LTC1349
Figure Receiver Propagation Delay Timing
Receiver Timing Test Load
OUTPUT INPUT 51pF
LTC1349 TA04
LTC1349 TEST CIRCUITS
Test Circuit
0.1µF 0.1µF DRIVER RS232 LINE PINS PROTECTED ±10kV DRIVER DRIVER ON/OFF LTC1349 0.1µF DRIVER DRIVER DRIVER
LTC1349
0.1µF
LTC1349 PACKAGE DESCRIPTIO
0.0256 (0.65) 0.010 0.015 (0.25 0.38) *THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
Dimensions inches (millimeters) unless otherwise noted.
Package 28-Lead SSOP
0.397 0.407* (10.07 10.33) 0.205 0.212* (5.20 5.38) 0.068 0.078 (1.73 1.99) 0.005 0.009 (0.13 0.22) 0.022 0.037 (0.55 0.95) 0.045 (1.14) 0.002 0.008 (0.05 0.21)
0.301 0.311 (7.65 7.90)
0.045 (1.14)
Package 28-Lead Plastic
1.455 (36.957)
0.600 0.625 (15.240 15.875)
0.130 0.005 (3.302 0.127) 0.015 (0.381)
0.045 0.065 (1.143 1.651)
0.070 (1.778)
0.009 0.015 (0.229 0.381)
0.505 0.560 (12.827 14.224) 0.125 (3.175) 0.035 0.080 (0.889 2.032) 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076)
+0.025 0.625 -0.015 +0.635 -0.381
15.87
Package 28-Lead
0.291 0.299 (7.391 7.595) (NOTE 0.697 0.712 (17.70 18.08) (NOTE
0.005 (0.127)
0.093 0.104 0.010 0.029 (2.362 2.642) (0.254 0.737) 0.050 (1.270)
0.037 0.045 (0.940 1.143)
0.009 0.013 (0.229 0.330) NOTE 0.016 0.050 (0.406 1.270)
0.014 0.019 (0.356 0.482)
0.004 0.012 (0.102 0.305)
NOTE
0.394 0.419 (10.007 10.643)
NOTE: IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS. THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LTC1349
World HeadquarterLinear Technology Corporation 1630 McCarthy Blvd. Milpitas, 95035-7417 Phone: (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com CENTRAL REGION Linear Technology Corporation 2010 Algonquin Road Suite Schaumburg, 60173 Phone: (847) 925-0860 FAX: (847) 925-0878 Linear Technology Corporation Kenosha, 53144 Phone: (262) 859-1900 FAX: (262) 859-1974 SOUTHWEST REGION Linear Technology Corporation 21243 Ventura Blvd. Suite Woodland Hills, 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 Linear Technology Corporation 15375 Barranca Parkway Suite A-213 Irvine, 92618 Phone: (949) 453-4650 FAX: (949) 453-4765 Linear Technology GmbH Zettachring D-70567 Stuttgart Germany Phone: (711) 1329890 FAX: (711) 7285055 JAPAN Linear Technology Bldg. 1-14 Shin-Ogawa-cho Shinjuku-ku Tokyo, Japan Phone: 3267-7891 FAX: 3267-8510 Linear Technology Tokyo Seimei Honmachi Bldg. 1-6-13 Awaza, Nishi-ku Osaka-shi, 550-0011, Japan Phone: 6533-5880 FAX: 6533-5885 KOREA Linear Technology Korea Co., Ltd. Yundang Building, #1002 Samsung-Dong 144-23 Kangnam-Ku, Seoul 135-090 Korea Phone: 792-1617 FAX: 792-1619 SINGAPORE Linear Technology Pte. Ltd. Yishun Industrial Park Singapore 768734 Phone: 753-2692 FAX: 752-0108 SWEDEN Linear Technology S-191 Sollentuna Sweden Phone: 623-1600 FAX: 623-1650 TAIWAN Linear Technology Corporation 602, Sec. Chung Shan Taipei, Taiwan, R.O.C. Phone: +886 2521-7575 FAX: +886 2562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. Coliseum, Riverside Camberley, Surrey GU15 United Kingdom Phone: (1276) 677676 FAX: (1276) 64851
U.S. Area Sales OfficeNORTHEAST REGION Linear Technology Corporation 3220 Tillman Drive Suite Bensalem, 19020 Phone: (215) 638-9667 FAX: (215) 638-9764 Linear Technology Corporation Research Place North Chelmsford, 01863 Phone: (978) 656-4750 FAX: (978) 656-4760 NORTHWEST REGION Linear Technology Corporation Sycamore Drive Milpitas, 95035 Phone: (408) 428-2050 FAX: (408) 432-6331 SOUTHEAST REGION Linear Technology Corporation 17000 Dallas Parkway Suite Dallas, 75248 Phone: (972) 733-3071 FAX: (972) 380-5138 Linear Technology Corporation 9430 Research Blvd. Echelon Suite Austin, 78759 Phone: (512) 343-3679 FAX: (512) 343-3680 Linear Technology Corporation 1080 West Houston Parkway Suite Houston, 77043 Phone: (713) 463-5001 FAX: (713) 463-5009 Linear Technology Corporation 15100 Weston Parkway Suite Carey, 27513 Phone: (919) 677-0066 FAX: (919) 678-0041
International Sales OfficeCHINA (HONG KONG) Linear Technology Corp. Ltd. Unit 2109, Metroplaza Tower Hing Fong Road Kwai Fong, N.T., Hong Kong Phone: +852 2428-0303 FAX: +852 2348-0885 FRANCE Linear Technology S.A.R.L. Immeuble Quartz" Chemin Justice 92290 Chatenay Malabry France Phone: 41079555 FAX: 46314613 GERMANY Linear Technology GmbH Oskar-Messter-Str. D-85737 Ismaning Germany Phone: (89) 962455-0 FAX: (89) 963147 Linear Technology GmbH Haselburger Damm D-59387 Ascheberg Germany Phone: (2593) 9516-0 FAX: (2593) 951679
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408)432-1900 FAX: (408) 434-0507 www.linear-tech.com
sn1349 1349fs LT/GP 1093 PRINTED
LINEAR TECHNOLOGY CORPORATION 1993

DESCRIPTIO Supply Current: 300µA Receivers Kept Alive SHUTDOWN Pr

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