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
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 Computers
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) QUIESCENT CURRENT SHUTDOWN CURRENT SHUTDOWN CURRENT (µA)
TEMPERATURE (°C) TEST CONDITION: DRIVER INPUTS TIED VCC.
LTC1349 TA02
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
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
0.1µF, unless otherwise noted.
Positive Negative
UNITS
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
±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 40°C 85°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
OUTPUT HIGH
DRIVER OUTPUT VOLTAGE
THRESHOLD VOLTAGE
TEMPERATURE (°C) OUTPUT 4.5V
SUPPLY CURRENT (mA)
4.5V
LTC1349 TPC01
Receiver Input Thresholds
Supply Current Data Rate
2500pF DRIVERS ACTIVE
TEMPERATURE (°C)
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 Waveforms
DRIVER OUTPUT 2500pF DRIVER OUTPUT INPUT
Receiver Output Waveforms
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
INPUT 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
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
0.205 0.212* (5.20 5.38)
0.005 0.009 (0.13 0.22) 0.022 0.037 (0.55 0.95) 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). 0.045 (1.14) 0.002 0.008 (0.05 0.21)
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)
0.009 0.015 (0.229 0.381)
+0.025 0.625 -0.015 +0.635 -0.381
15.87
0.125 (3.175)
0.035 0.080 (0.889 2.032) 0.100 0.010 (2.540 0.254)
0.005 (0.127)
0.291 0.299 (7.391 7.595) (NOTE
0.093 0.104 0.010 0.029 (2.362 2.642) (0.254 0.737) 0.050 (1.270)
0.009 0.013 (0.229 0.330) NOTE 0.016 0.050 (0.406 1.270)
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.
Dimensions inches (millimeters) unless otherwise noted.
Package 28-Lead SSOP
0.397 0.407* (10.07 10.33) 0.068 0.078 (1.73 1.99)
0.301 0.311 (7.65 7.90)
0.045 (1.14)
Package 28-Lead Plastic
0.070 (1.778) 1.455 (36.957)
0.505 0.560 (12.827 14.224) 0.018 0.003 (0.457 0.076)
Package 28-Lead
0.697 0.712 (17.70 18.08) (NOTE
0.037 0.045 (0.940 1.143)
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)
LTC1349
U.S. Area Sales Offices
NORTHEAST REGION Linear Technology Corporation Oxford Valley 2300 Lincoln Hwy.,Suite Langhorne, 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation Lowell St., Suite Wilmington, 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite Dallas, 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square Mitchell Court, Suite A-25 Addison, 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite Woodland Hills, 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 NORTHWEST REGION Linear Technology Corporation Sycamore Milpitas, 95035 Phone: (408) 428-2050 FAX: (408) 432-6331
International Sales Offices
FRANCE Linear Technology S.A.R.L. Immeuble Quartz" Chemin Justice 92290 Chatenay Malabry France Phone: 33-1-41079555 FAX: 33-1-46314613 GERMANY Linear Techonolgy GMBH Untere Hauptstr. D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 JAPAN Linear Technology Bldg. 4-4-12 Iidabashi, Chiyoda-Ku Tokyo, Japan Phone: 81-3-3237-7891 FAX: 81-3-3237-8010 KOREA Linear Technology Korea Branch Namsong Building, #505 Itaewon-Dong 260-199 Yongsan-Ku, Seoul Korea Phone: 82-2-792-1617 FAX: 82-2-792-1619 SINGAPORE Linear Technology Pte. Ltd. Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 TAIWAN Linear Technology Corporation 801, Sec. Chung Shan Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. Coliseum, Riverside Camberley, Surrey GU15 United Kingdom Phone: 44-276-677676 FAX: 44-276-64851
World Headquarters
Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507
08/16/93
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LT/GP 1093 PRINTED
LINEAR TECHNOLOGY CORPORATION 1993

DESCRIPTIO Supply Current: 300µA Receivers Kept Alive SHUTDOWN Pr

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