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LTC1383 5V Low Power RS232 Transceiver
FEATURES
s s s s s s s
DESCRIPTIO
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Operates from a Single 5V Supply Low Supply Current: ICC = 220A ESD Protection Over 10kV Available in 16-Pin SOIC Narrow Package Uses Small Capacitors: 0.1F Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to 25V Without Damage Pin Compatible with LT1181A and MAX232A
The LTC1383 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 0.1F capacitors. The supply current (ICC) of the transceiver is only 220A 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, 3k load. Both driver outputs and receiver inputs can be forced to 25V without damage and can survive multiple 10kV ESD strikes.
APPLICATI
s s
S
Notebook Computers Palmtop Computers
TYPICAL APPLICATI
1 0.1F 3 4 0.1F 5 11 VCC 300k LOGIC INPUT LOGIC OUTPUT 10 12 5k 9 5k LTC1383 VCC 300k
16 2 6
VCC = 5V 0.1F
Quiescent Supply Current vs Temperature
600 TEST CONDITION: VCC = 5V 500
QUIESCENT CURRENT (A)
0.1F
400 300 200 100 0 -20 QUIESCENT CURRENT
LOGIC INPUT
14
232 OUTPUT
7 13
232 OUTPUT 232 INPUT
LOGIC OUTPUT
8 15
232 INPUT
0
LTC1383 * TA01
U
20 40 TEMPERATURE (C) 60 80
LTC1383 * TA02
UO
UO
1
LTC1383 ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW C1+ V+ C1- C2+ C2 - V- TR2 OUT RX2 IN 1 2 3 4 5 6 7 8 16 VCC 15 GND 14 TR1 OUT 13 RX1 IN 12 RX1 OUT 11 TR1 IN 10 TR2 IN 9 RX2 OUT
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 + 0.3V Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range .................... 0C to 70C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER LTC1383CN LTC1383CS
N PACKAGE 16-LEAD PLASTIC DIP
S PACKAGE 16-LEAD NARROW PLASTIC SOIC
TJMAX = 125C, JA = 65C/W (N) TJMAX = 125C, JA = 95C/W (S)
Consult factory for Industrial and Military grade products.
DC ELECTRICAL CHARACTERISTICS
PARAMETER Any Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Power Supply Generator V + Output Voltage V - Output Voltage CONDITIONS 3k to GND Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Input Low Threshold Input High Threshold
VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
MIN Positive Negative
q q q q q q
TYP 7.0 - 6.5 1.4 1.4 - 20 12
MAX
UNITS V V V V A A mA V V V k V V mA mA V V V V
5.0 - 5.0 2.0
0.8 5 - 40
q q q
0.8 0.1 3 3.0 - 15 10
- 10V VIN 10V Output Low, IOUT = - 1.6mA (VCC = 5V) Output High, IOUT = 160A (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current VOUT = 0V IOUT = 0mA IOUT = 8mA IOUT = 0mA IOUT = - 8mA
q q
1.3 1.7 0.4 5 0.2 3.2 - 40 20 8.0 7.5 - 8.0 - 7.0
2.4 1 7 0.4
2
U
W
U
U
WW
W
LTC1383
DC ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply VCC Supply Current Digital Input Threshold Low Digital Input Threshold High CONDITIONS No Load (Note 2)
VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
MIN
q q q
TYP 0.22 1.4 1.4
MAX 0.5 0.8
UNITS mA V V
2.0
AC CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL)
VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
CONDITIONS RL = 3k, CL = 51pF RL = 3k, CL = 2500pF t HLD (Figure 1) t LHD (Figure 1) t HLR (Figure 2) t LHR (Figure 2) MIN 3
q q q q
TYP 8 5 2 2 0.3 0.3
MAX 30 3.5 3.5 0.8 0.8
UNITS V/s V/s s s s s
The q denotes specifications which apply over the operating temperature range of 0C TA 70C. Note 1: Absolute maximum ratings are those values beyond which the life of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs unloaded.
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage vs Temperature
10 8
DRIVER OUTPUT VOLTAGE (V)
RL = 3k
OUTPUT HIGH VCC = 5V
THRESHOLD VOLTAGE (V)
4 2 0 -2 -4 -6 -8 0 10 20 30 50 40 TEMPERATURE (C) 60 70 OUTPUT LOW VCC = 4.5V VCC = 5V
1.8 1.6 1.4 1.2 VTL
SUPPLY CURRENT (mA)
6
VCC = 4.5V
LTC1383 * TPC01
UW
Receiver Input Thresholds vs Temperature
2.2 2.0 VTH
35 30 25 20 15 10 5 45 40
Supply Current vs Data Rate
VCC = 5V RL = 3k CL = 2500pF 2 DRIVERS ACTIVE
1.0 0 10 40 30 50 20 TEMPERATURE (C) 60 70
0 0 25 50 75 100 125 DATA RATE (kBAUD) 150 175
LTC1383 * TPC02
LTC1383 * TPC03
3
LTC1383 TYPICAL PERFORMANCE CHARACTERISTICS
VCC Supply Current vs Temperature
18 16
SUPPLY CURRENT (mA) DRIVER OUTPUT RL = 3k CL = 2500pF
14 12 10 8 6 4 1 DRIVER LOADED RL = 3k 2 DRIVERS LOADED RL = 3k
2 0 0 10 20 30 50 40 TEMPERATURE (C) 60 70
LTC1383 * TPC04
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor. GND: Ground Pin. V +: Positive Supply Output (RS232 Drivers). V + 2V
CC -
2V. This pin requires an external capacitor C = 0.1F for charge storage. The capacitor may be tied to ground or VCC. With multiple devices, the V + and V - pins may share a common capacitor. For large numbers of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V -: Negative Supply Output (RS232 Drivers). V - - (2VCC - 2V). This pin requires an external capacitor C = 0.1F for charge storage. C1+, C1-, C2+, C2-: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1F: one from C1+ to C1- and another from C2+ to C2 -. To maintain
4
UW
Driver Output Waveforms
Receiver Output Waveforms
DRIVER OUTPUT RL = 3k INPUT
RECEIVER OUTPUT CL = 51pF
INPUT
LTC1383 * TPC05
LTC1383 * TPC06
U
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charge pump efficiency, the capacitor's effective series resistance should be less than 2. TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left unconnected since 300k input pull-up resistors to VCC are included on chip. TR OUT: Driver Outputs at RS232 Voltage Levels. The driver outputs are protected against ESD to 10kV for human body model discharges. RX IN: Receiver Inputs. These pins can be forced to 25V without damage. The receiver inputs are protected against ESD to 10kV for human body model discharges. Each receiver provides 0.4V of hysteresis for noise immunity. RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels.
LTC1383
SWITCHI G TI E WAVEFOR S
DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
LTC1383 * F01
Figure 1. Driver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF 3k
RX INPUT RX 51pF
DRIVER INPUT
LTC1383 * TA03
0.1F
0.1F
LOGIC INPUT
LOGIC INPUT LOGIC OUTPUT
LOGIC OUTPUT
W
1 3 4 5 11 10 12 9
W
U
RX INPUT RX OUTPUT t LHR
1.7V
VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V
LTC1383 * F02
0V V
-
Figure 2. Receiver Propagation Delay Timing
Receiver Timing Test Load
RX OUTPUT
LTC1383 * TA04
ESD Test Circuit
16 2 LTC1383 VCC 300k 14 VCC 300k 7 13 5k 8 5k 15 232 OUTPUT 232 INPUT RS232 LINE PINS PROTECTED TO 10kV 6 0.1F 0.1F VCC
232 OUTPUT
232 INPUT
LTC1383 * TA05
5
LTC1383
TYPICAL APPLICATIONS N
Paralleling Power Supply Generator with Common Storage Capacitors
1 0.1F 3 4 0.1F 5 11 VCC 300k LOGIC INPUT LOGIC OUTPUT 10 12 5k 9 5k LTC1383 VCC 300k
LOGIC INPUT
LOGIC OUTPUT
PACKAGE DESCRIPTION
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.025 0.325 -0.015 8.255 +0.635 -0.381
)
6
U
U
16 2 6
VCC = 5V 0.1F 0.1F
1 0.1F 3 4 0.1F 5 11 VCC 300k LTC1383 VCC 300k
16 2 6
VCC = 5V
14
232 OUTPUT
LOGIC INPUT
14
232 OUTPUT
7 13
232 OUTPUT 232 INPUT
LOGIC INPUT LOGIC OUTPUT
10 12 5k 9 5k
7 13
232 OUTPUT 232 INPUT
8 15
232 INPUT
LOGIC OUTPUT
8 15
232 INPUT
LTC1383 * TA06
Dimensions in inches (millimeters) unless otherwise noted. N Package 16-Lead Plastic DIP
0.770 (19.558) MAX 16 15 14 13 12 11 10 9
0.260 0.010 (6.604 0.254)
1 0.130 0.005 (3.302 0.127)
2
3
4
5
6
7
8
0.045 - 0.065 (1.143 - 1.651)
0.015 (0.381) MIN
0.065 (1.651) TYP
0.125 (3.175) MIN
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.018 0.003 (0.457 0.076)
N16 0492
LTC1383
PACKAGE DESCRIPTION
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP
0.016 - 0.050 0.406 - 1.270
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
Dimensions in inches (millimeters) unless otherwise noted. S Package 16-Lead Plastic SOIC
0.386 - 0.394* (9.804 - 10.008) 16 15 14 13 12 11 10 9
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157* (3.810 - 3.988)
1 0.053 - 0.069 (1.346 - 1.752)
2
3
4
5
6
7
8
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
SO16 0893
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
7
LTC1383
U.S. Area Sales Offices
NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 NORTHWEST REGION Linear Technology Corporation 782 Sycamore Dr. Milpitas, CA 95035 Phone: (408) 428-2050 FAX: (408) 432-6331
International Sales Offices
FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" 58 Chemin de la Justice 92290 Chatenay Malabry France Phone: 33-1-41079555 FAX: 33-1-46314613 GERMANY Linear Techonolgy GmbH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 JAPAN Linear Technology KK 5F YZ Bldg. 4-4-12 Iidabashi, Chiyoda-Ku Tokyo, 102 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. 101 Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 TAIWAN Linear Technology Corporation Rm. 801, No. 46, Sec. 2 Chung Shan N. Rd. Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851
World Headquarters
Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507
0294
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
LT/GP 0594 10K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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