DESCRIPTIO Operates from Single Supply Supply Current: 220µA 0.2µ
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LTC1382 Power RS232 Transceiver with Shutdown
DESCRIPTIO
Operates from Single Supply Supply Current: 220µA 0.2µA Shutdown Mode Protection Over ±10kV Uses Small Capacitors: 0.1µF Operates 120kBaud Output Overvoltage Does Force Current Back into Supplies RS232 Lines Forced ±25V Without Damage Compatible with LT1180A
LTC1382 ultra-low power 2-driver/2-receiver RS232 transceiver that operates from single supply. charge pump requires only four spacesaving 0.1µF capacitors. transceiver operates modes, Normal Shutdown. Normal mode, only 220µA with driver outputs unloaded. Shutdown mode, charge pump turned off, driver outputs forced into three-state, both receivers drops 0.2µA. LTC1382 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.
registered trademarks Linear Technology Corporation.
APPLICATIO
Notebook Computers Palmtop Computers
TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown
0.1µF 0.1µF 300k LOGIC INPUT LOGIC OUTPUT OUTPUT INPUT LTC1382 300k 0.1µF 0.1µF
Quiescent Shutdown Supply Current Temperature
TEST CONDITION:
QUIESCENT CURRENT (µA)
SHUTDOWN CURRENT QUIESCENT CURRENT
LOGIC INPUT
OUTPUT
LOGIC OUTPUT ON/OFF
INPUT
LTC1382 TA01
SHUTDOWN CURRENT (µA)
TEMPERATURE (°C)
LTC1382 TA02
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LTC1382
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 LTC1382C 70°C LTC1382I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ON/OFF PACKAGE 18-LEAD PLASTIC
ORDER PART NUMBER LTC1382CN LTC1382CSW LTC1382IN LTC1382ISW
PACKAGE 18-LEAD PDIP
TJMAX 125°C, 65°C/W TJMAX 125°C, 85°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 Output Leakage Current Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current CONDITIONS
denotes specifications which apply over full operating temperature range. 0.1µF, VON/OFF VCC, unless otherwise noted.
Positive Negative
UNITS
Input Level (VOUT High) Input High Level (VOUT Low) VOUT Shutdown (Note VOUT ±10V Input Threshold Input High Threshold Output Low, IOUT 1.6mA (VCC Output High, IOUT 160µA (VCC Sinking Current, VOUT Sourcing Current VOUT Shutdown (Note VOUT
±500
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LTC1382
ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Generator Output Voltage Output Voltage Supply Rise Time Power Supply Supply Current Supply Leakage Current (VCC) Digital Input Threshold Digital Input Threshold High CONDITIONS IOUT IOUT IOUT IOUT Shutdown Turn-On
denotes specifications which apply over full operating temperature range. 0.1µF, VON/OFF VCC, unless otherwise noted.
UNITS
Load (Note 70°C Load (Note 40°C 85°C Shutdown (Note
0.22 0.35
CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL RS232) Receiver Propagation Delay (RS232 TTL)
denotes specifications which apply over full operating temperature range. 0.1µF, unless otherwise 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.
Note Measurements made Shutdown mode performed with VON/OFF
TYPICAL PERFOR CHARACTERISTICS
Driver Output Voltage Temperature
OUTPUT HIGH
THRESHOLD VOLTAGE
DRIVER OUTPUT VOLTAGE
TEMPERATURE (°C) OUTPUT 4.5V
SUPPLY CURRENT (mA)
4.5V
LTC1382 TPC01
Receiver Input Thresholds Temperature
Supply Current Data Rate
2500pF DRIVERS ACTIVE
TEMPERATURE (°C)
DATA RATE (kBAUD)
LTC1382 TPC02
LTC1382 TPC03
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LTC1382 TYPICAL PERFOR CHARACTERISTICS
Supply Current Temperature
SHORT-CIRCUIT CURRENT (mA)
SUPPLY CURRENT (mA)
TEMPERATURE (°C) DRIVER LOADED DRIVERS LOADED
SHORT-CIRCUIT CURRENT (mA)
LTC1382 TPC04
Driver Leakage Shutdown Temperature
LEAKAGE CURRENT (µA)
TEMPERATURE (°C) VOUT VOUT -20V
LTC1349 TPC05
Driver Short-Circuit Current Temperature
Receiver Short-Circuit Current Temperature
ISC+
ISC-
ISC+
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1382 TPC05
LTC1382 TPC06
Driver Output Waveforms
DRIVER OUTPUT 2500pF DRIVER OUTPUT INPUT
Receiver Output Waveforms
RECEIVER OUTPUT 51pF
INPUT
LTC1382 TPC08
LTC1382 TPC09
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LTC1382
CTIO
VCC: Input Supply Pin. This should decoupled with 0.1µF ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible Shutdown Pin. logic puts device Shutdown mode. Both driver outputs forced into three-state supply current 0.2µA. Positive Supply Output (RS232 Drivers). 2VCC 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 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. minimize power consumption, internal driver pull-up resistors disconnected from Shutdown mode. OUT: Driver Outputs RS232 Voltage Levels. Outputs high impedance state when Shutdown 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. Outputs high impedance state when Shutdown mode.
SWITCHI WAVEFOR
DRIVER INPUT DRIVER OUTPUT 1.4V 1.4V
LTC1382
Figure Driver Propagation Delay Timing
INPUT OUTPUT
1.7V
1.3V 2.4V
LTC1382
0.8V
Figure Receiver Propagation Delay Timing
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LTC1382
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF
Receiver Timing Test Load
OUTPUT INPUT 51pF
DRIVER INPUT
LTC1382 TA03
LTC1382 TA04
Test Circuit
0.1µF 0.1µF 300k LOGIC INPUT LOGIC OUTPUT OUTPUT INPUT RS232 LINE PINS PROTECTED ±10kV LTC1382 300k 0.1µF 0.1µF
LOGIC INPUT
OUTPUT
LOGIC OUTPUT ON/OFF
INPUT
LTC1382 TA05
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LTC1382
PACKAGE DESCRIPTIO
.300 .325 (7.620 8.255)
.009 .015 (0.229 0.381) +.035 .325 -.015
8.255
+0.889 -0.381
INCHES MILLIMETERS *THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .010 INCH (0.254mm)
NOTE: DIMENSIONS
.030 ±.005
.420
RECOMMENDED SOLDER LAYOUT .291 .299 (7.391 7.595) NOTE .010 .029 (0.254 0.737)
.005 (0.127)
.009 .013 (0.229 0.330) NOTE: DIMENSIONS
NOTE .016 .050 (0.406 1.270)
INCHES (MILLIMETERS) DRAWING SCALE IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .006" (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.
Package 18-Lead PDIP (Narrow .300 Inch)
(Reference 05-08-1510)
.900* (22.860) .255 .015* (6.477 0.381) .130 .005 (3.302 0.127) .020 (0.508) .045 .065 (1.143 1.651) .065 (1.651) .125 (3.175) .005 (0.127) .018 .003 (0.457 0.076) .100 (2.54)
0502
Package 18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference 05-08-1620)
.050 .045 ±.005 .447 .463 (11.354 11.760) NOTE
.325 ±.005
NOTE
.394 .419 (10.007 10.643)
.093 .104 (2.362 2.642)
.037 .045 (0.940 1.143)
.050 (1.270)
.004 .012 (0.102 0.305)
.014 .019 (0.356 0.482)
(WIDE) 0502
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LTC1382
RELATED PARTS
PART NUMBER LT1780/LT1781 LTC1383 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, Narrow 16-pin 220µA Supply Current, Receivers Active Shutdown 220µA Supply Current, Receivers Active Shutdown 220µA Supply Current, Narrow 16-pin
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 linear.com
LW/TP 1002 PRINTED
LINEAR TECHNOLOGY CORPORATION 1994
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