DESCRIPTIO Operates from Single Supply Supply Current: 220µA Prot
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LTC1383 Power RS232 Transceiver
DESCRIPTIO
Operates from Single Supply Supply Current: 220µA Protection Over ±10kV Available 16-Pin SOIC Narrow Package Uses Small Capacitors: 0.1µF Operates 120kBaud Output Overvoltage Does Force Current Back into Supplies RS232 Lines Forced ±25V Without Damage Compatible with LT1181A MAX232A
LTC1383 ultra-low power 2-driver/2-receiver RS232 transceiver that operates from single supply. charge pump requires only four spacesaving 0.1µF capacitors. supply current (ICC) transceiver only 220µA with driver outputs unloaded. LTC1383 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.
APPLICATIO
Notebook Computers Palmtop Computers
registered trademarks Linear Technology Corporation.
TYPICAL APPLICATIO
Quiescent Supply Current Temperature
0.1µF 0.1µF 300k LOGIC INPUT LOGIC OUTPUT OUTPUT INPUT LTC1383 300k 0.1µF 0.1µF
TEST CONDITION: QUIESCENT CURRENT (µA) QUIESCENT CURRENT
LOGIC INPUT
OUTPUT
LOGIC OUTPUT
INPUT
LTC1383 TA01
TEMPERATURE (°C)
LTC1383 TA02
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LTC1383
ABSOLUTE
RATI
PACKAGE/ORDER ATIO
VIEW
Supply Voltage (VCC) Input Voltage Driver 0.3V 0.3V Receiver Digital Input 0.3V 0.3V Output Voltage Driver Receiver 0.3V 0.3V Short-Circuit Duration Driver Output Indefinite Receiver Output Indefinite Operating Temperature Range LTC1383C 70°C LTC1383I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1383CN LTC1383CS LTC1383IN LTC1383IS
PACKAGE 16-LEAD PDIP
PACKAGE 16-LEAD PLASTIC
TJMAX 125°C, 70°C/W TJMAX 125°C, 90°C/W
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Power Supply Generator Output Voltage Output Voltage CONDITIONS
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 0.1µF, unless noted.
Positive Negative
UNITS
Input Level (VOUT High) Input High Level (VOUT Low) VOUT Input Threshold Input High Threshold Output Low, IOUT 1.6mA (VCC Output High, IOUT 160µA (VCC Sinking Current, VOUT Sourcing Current VOUT IOUT IOUT IOUT IOUT
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LTC1383
ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Supply Current Digital Input Threshold Digital Input Threshold High CONDITIONS
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 0.1µF, unless noted.
0.22 0.35
UNITS
Load (Note 70°C Load (Note 40°C 85°C
CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL RS232) Receiver Propagation Delay (RS232 TTL)
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 0.1µF, unless noted.
CONDITIONS 51pF 2500pF (Figure (Figure (Figure (Figure
UNITS V/µs V/µs
Note Absolute Maximum Ratings those values beyond which life device impaired.
Note Supply current measured with driver receiver outputs unloaded.
TYPICAL PERFOR CHARACTERISTICS
Driver Output Voltage Temperature
OUTPUT HIGH
DRIVER OUTPUT VOLTAGE
THRESHOLD VOLTAGE
TEMPERATURE (°C) OUTPUT 4.5V
SUPPLY CURRENT (mA)
4.5V
LTC1383 TPC01
Receiver Input Thresholds Temperature
Supply Current Data Rate
2500pF DRIVERS ACTIVE
TEMPERATURE (°C)
DATA RATE (kBAUD)
LTC1383 TPC02
LTC1383 TPC03
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LTC1383 TYPICAL PERFOR CHARACTERISTICS
Supply Current Temperature
SUPPLY CURRENT (mA)
DRIVER LOADED DRIVERS LOADED
TEMPERATURE (°C)
LTC1383 TPC04
CTIO
VCC: Input Supply Pin. This should decoupled with 0.1µF ceramic capacitor. GND: Ground Pin. Positive Supply Output (RS232 Drivers).
This requires external capacitor 0.1µF charge storage. capacitor tied ground VCC. With multiple devices, pins share common capacitor. large numbers devices, increasing size shared common storage capacitors recommended reduce ripple. Negative Supply Output (RS232 Drivers). (2VCC 2V). This requires external capacitor 0.1µF charge storage. C1+, C1-, C2+, C2-: Commutating Capacitor Inputs. These pins require external capacitors 0.1µF: from another from maintain
Driver Output Waveforms
DRIVER OUTPUT 2500pF DRIVER OUTPUT INPUT
Receiver Output Waveforms
RECEIVER OUTPUT 51pF
INPUT
LTC1383 TPC05
LTC1383 TPC06
5µs/DIV
5µs/DIV
charge pump efficiency, capacitor's effective series resistance should less than RS232 Driver Input Pins. Inputs TTL/CMOS compatible. inputs unused drivers left unconnected since 300k input pull-up resistors included chip. OUT: Driver Outputs RS232 Voltage Levels. 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.
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LTC1383
SWITCHI WAVEFOR
DRIVER INPUT DRIVER OUTPUT 1.4V 1.4V
LTC1383
Figure Driver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF
DRIVER INPUT
LTC1383 TA03
0.1µF
0.1µF
LOGIC INPUT
LOGIC INPUT LOGIC OUTPUT
LOGIC OUTPUT
INPUT OUTPUT
1.7V
1.3V 2.4V 0.8V
LTC1383
Figure Receiver Propagation Delay Timing
Receiver Timing Test Load
OUTPUT INPUT 51pF
LTC1383 TA04
Test Circuit
300k OUTPUT INPUT RS232 LINE PINS PROTECTED ±10kV LTC1383 300k 0.1µF 0.1µF
OUTPUT
INPUT
LTC1383 TA05
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LTC1383
TYPICAL APPLICATIO
Paralleling Power Supply Generator with Common Storage Capacitors
0.1µF 0.1µF 300k LOGIC INPUT LOGIC OUTPUT LTC1383 300k
LOGIC INPUT
LOGIC OUTPUT
0.1µF 0.1µF
0.1µF 0.1µF 300k LTC1383 300k
OUTPUT
LOGIC INPUT
OUTPUT
OUTPUT INPUT
LOGIC INPUT LOGIC OUTPUT
OUTPUT INPUT
INPUT
LOGIC OUTPUT
INPUT
LTC1383 TA06
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LTC1383
PACKAGE DESCRIPTIO
.300 .325 (7.620 8.255)
.008 .015 (0.203 0.381) +.035 .325 -.015 +0.889 8.255 -0.381
INCHES MILLIMETERS *THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .010 INCH (0.254mm)
NOTE: DIMENSIONS
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.
Package 16-Lead PDIP (Narrow .300 Inch)
(Reference 05-08-1510)
.770* (19.558) .255 .015* (6.477 0.381) .130 .005 (3.302 0.127) .020 (0.508) .045 .065 (1.143 1.651) .065 (1.651) .120 (3.048) .100 (2.54) .018 .003 (0.457 0.076)
1002
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LTC1383
PACKAGE DESCRIPTIO
.045 ±.005 .050
.245
.030 ±.005
RECOMMENDED SOLDER LAYOUT
.010 .020 (0.254 0.508)
.008 .010 (0.203 0.254)
.016 .050 (0.406 1.270)
NOTE: DIMENSIONS
INCHES (MILLIMETERS) DRAWING SCALE THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .006" (0.15mm)
RELATED PARTS
PART NUMBER LT1780/LT1781 LTC1382 LTC1384 LTC1385 LTC1386 DESCRIPTION Driver, Receiver RS232 Transeivers Driver, Receiver RS232 Transceiver Driver, Receiver RS232 Transceiver 3.3V, Driver, Receiver RS562 Transceiver 3.3V, Driver, Receiver RS562 Transceiver COMMENTS ±15kV 1000-4 220µA Supply Current, 0.2µA Shutdown 220µA Supply Current, Receivers Active Shutdown 220µA Supply Current, Receivers Active Shutdown 220µA Supply Current, Narrow 16-pin
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 linear.com
Package 16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
.386 .394 (9.804 10.008) NOTE .160 ±.005 .228 .244 (5.791 6.197) .150 .157 (3.810 3.988) NOTE .053 .069 (1.346 1.752) .004 .010 (0.101 0.254) .014 .019 (0.355 0.483) .050 (1.270)
0502
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LINEAR TECHNOLOGY CORPORATION 1994
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