DESCRIPTIO Supply Current: 300µA Five Receivers Kept Alive Shutdo
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LTC1347 Power RS232 3-Driver/5-Receiver Transceiver with Receivers Active Shutdown
DESCRIPTIO
Supply Current: 300µA Five Receivers Kept Alive Shutdown Protection Over ±10kV Operates from Single Supply Uses Small Capacitors: 0.1µF Operates 120kBaud Three-State Outputs High Impedance When Output Overvoltage Does Force Current Back into Supplies RS232 Lines Forced ±25V Without Damage Compatible with LT1137 LT1237 Flowthrough Architecture
LTC1347 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, five receivers kept alive supply current 80µA. RS232 outputs assume high impedance state Shutdown with power off. LTC1347 fully compliant with data rate overvoltage RS232 specifications. transceiver operate 120kbaud with 2500pF, load. Both driver outputs receiver inputs forced ±25V without damage, survive multiple ±10kV strikes.
APPLICATI
Notebook Computers Palmtop Computers
TYPICAL APPLICATI
3-Drivers/5-Receivers with SHUTDOWN
0.1µF 0.1µF DRIVER DRIVER DRIVER ON/OFF LTC1347 0.1µF DRIVER DRIVER DRIVER
1347 TA01
Quiescent Shutdown Supply Current Temperature
1200
SHUTDOWN CURRENT (µA)
0.1µF
1000
QUIESCENT CURRENT (µA)
TEMPERATURE (°C) TEST CONDITION: DRIVER INPUTS TIED VCC.
1347 TA02
SHUTDOWN CURRENT QUIESCENT CURRENT
LTC1347 ABSOLUTE RATI
PACKAGE/ORDER ATIO
VIEW DRIVER DRIVER DRIVER
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 70°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1347CG LTC1347CN LTC1347CS
DRIVER DRIVER DRIVER 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 Industrial 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 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 ±10V Output Low, IOUT 1.6mA (VCC Output High, IOUT 160µA (VCC Sinking Current, VOUT Sourcing Current, VOUT
±500
LTC1347
ELECTRICAL CHARACTERISTICS 0.1µF, unless otherwise noted.
PARAMETER Power Supply Generator Output Voltage Output Voltage Supply Rise Time Power Supply Supply Current CONDITIONS IOUT IOUT 12mA IOUT IOUT 12mA Shutdown Turn-On UNITS
Load (All Drivers 5V)(Note Load (All Drivers (Note Shutdown (Note
On/Off Threshold On/Off Threshold High
80.0
120.0
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°C commercial 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 PERFORMANCE CHARACTERISTICS
Driver Output Voltage
DRIVER OUTPUT VOLTAGE
OUTPUT HIGH THRESHOLD VOLTAGE 4.5V
SUPPLY CURRENT (mA)
OUTPUT 4.5V
TEMPERATURE (°C)
1347
Receiver Input Thresholds
Supply Current Data Rate
2500pF DRIVERS ACTIVE
TEMPERATURE (°C)
DATA RATE (kBAUD)
1347
1347
LTC1347 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current
DRIVERS LOADED
LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA)
VOUT VOUT -20V SHORT-CIRCUIT CURRENT (mA)
DRIVER LOADED
TEMPERATURE (°C)
Receiver Short-Circuit Current
SHORT-CIRCUIT CURRENT (mA)
ISC-
ISC+
TEMPERATURE (°C)
CTIO
VCC: Input Supply Pin. Supply current typically 80µA 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 80µA. driver outputs high impedance state. This cannot float. Positive Supply Output (RS232 Drivers). 2VCC This requires external capacitor 0.1µF charge storage. capacitor tied ground VCC. 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.
1347
Driver Leakage Shutdown
Driver Short-Circuit Current
ISC- ISC+
TEMPERATURE (°C)
TEMPERATURE (°C)
1347
1347
Driver Output Waveforms
DRIVER OUTPUT 2500pF DRIVER OUTPUT INPUT
Receiver Output Waveforms
RECEIVER OUTPUT 51pF
INPUT
1347
1347
1347
LTC1347
CTIO
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 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. receivers kept alive shutdown.
SWITCHI WAVEFOR
DRIVER INPUT DRIVER OUTPUT 1.4V 1.4V
1347
Figure Driver Propagation Delay Timing
INPUT OUTPUT
1.7V
Figure Receiver Propagation Delay Timing
1.3V 2.4V 0.8V
1347
LTC1347 TEST CIRCUITS
DRIVER INPUT
DRIVER OUTPUT DRIVER 51pF
INPUT
OUTPUT 51pF
1347
1347
Figure Driver Timing Test Load
Figure Receiver Timing Test Load
0.1µF 0.1µF DRIVER RS232 LINE PINS PROTECTED ±10kV DRIVER DRIVER ON/OFF
LTC1347
0.1µF DRIVER DRIVER DRIVER
1347 TC01
0.1µF
Figure Test Circuit
LTC1347
PACKAGE DESCRIPTION
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)
0.009 0.015 (0.229 0.381)
+0.025 0.625 -0.015
+0.635 15.87 -0.381
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) unltess 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)
0.045 0.065 (1.143 1.651)
0.505 0.560 (12.827 14.224) 0.018 0.003 (0.457 0.076)
Package 28-Lead Plastic
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)
LTC1347
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
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LT/GP 0594 PRINTED
LINEAR TECHNOLOGY CORPORATION 1994
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