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.
APPLICATIO
Notebook Computers Palmtop Computers
registered trademarks Linear Technology Corporation.
TYPICAL APPLICATIO
3-Drivers/5-Receivers with Shutdown
0.1µF 0.1µF DRIVER DRIVER DRIVER ON/OFF LTC1349 0.1µF DRIVER DRIVER DRIVER
LTC1349 TA01
Quiescent Shutdown Supply Current Temperature
1200
0.1µF
1000
QUIESCENT CURRENT (µA)
TEMPERATURE (°C) TEST CONDITION: DRIVER INPUTS TIED VCC.
LTC1349 TA02
SHUTDOWN CURRENT (µA)
SHUTDOWN CURRENT
QUIESCENT CURRENT
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LTC1349
ABSOLUTE RATI PACKAGE/ORDER ATIO
VIEW ON/OFF PACKAGE 28-LEAD SSOP PACKAGE 28-LEAD PDIP
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 LTC1349CNW LTC1349CSW LTC1349IG LTC1349INW LTC1349ISW
PACKAGE 28-LEAD PLASTIC
TJMAX 125°C, 96°C/W TJMAX 125°C, 56°C/W (NW) TJMAX 125°C, 85°C/W (SW)
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 Power Supply Generator Output Voltage Output Voltage Supply Rise Time CONDITIONS
denotes specifications which apply over full operating temperature range. 0.1µF, unless noted.
Positive Negative
UNITS
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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
PARAMETER Power Supply Supply Current CONDITIONS
denotes specifications which apply over full operating temperature range. 0.1µF, unless noted.
UNITS
Supply Leakage Current (VCC) On/Off Threshold On/Off Threshold High
Load (All Drivers VCC)(Note 70°C Load (All Drivers 0V)(Note 70°C Load (All Drivers VCC)(Note 85°C Load (All Drivers VCC)(Note 40°C Load (All Drivers 0V)(Note 40°C 85°C Shutdown (Note
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 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 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
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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)
DRIVER OUTPUT 2500pF
ISC-
INPUT
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
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LTC1349 TPC07
Driver Leakage Shutdown
Driver Short-Circuit Current
ISC- ISC+
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1349 TPC05
LTC1349 TPC06
Driver Output Waveforms
Receiver Output Waveforms
DRIVER OUTPUT
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
INPUT OUTPUT
1.7V
Figure Receiver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF
DRIVER INPUT
LTC1349 TA03
1.3V 2.4V 0.8V
LTC1349
Receiver Timing Test Load
OUTPUT INPUT 51pF
LTC1349 TA04
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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
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LTC1349
PACKAGE DESCRIPTIO
Package 28-Lead Plastic SSOP (5.3mm)
(Reference 05-08-1640)
9.90 10.50* (.390 .413) 1.25 ±0.12 7.40 8.20 (.291 .323) 0.65 (.079)
0.42 ±0.03 RECOMMENDED SOLDER LAYOUT 5.00 5.60** (.197 .221)
0.09 0.25 (.0035 .010)
0.55 0.95 (.022 .037)
0.65 (.0256)
NOTE: CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS DIMENSIONS (INCHES) DRAWING SCALE *DIMENSIONS INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED .152mm (.006") SIDE **DIMENSIONS INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED .254mm (.010") SIDE
0.22 0.38 (.009 .015)
0.05 (.002)
SSOP 0802
Package 28-Lead PDIP (Wide .600 Inch)
(Reference 05-08-1520)
1.467* (36.957)
.505 .560* (12.827 14.224)
.600 .625 (15.240 15.875) .150 .005 (3.810 0.127) .015 (0.381)
.045 .065 (1.143 1.651)
.008 .015 (0.203 0.381) +.035 .625 -.015
.070 (1.778) .120 (3.175) .035 .080 (0.889 2.032) .100 (2.54) .018 .003 (0.457 0.076)
INCHES MILLIMETERS *THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .010 INCH (0.254mm)
NOTE: DIMENSIONS
15.87
+0.889 -0.381
NW28 1002
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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.
LTC1349
PACKAGE DESCRIPTIO
.030 ±.005
.050 .045 ±.005 .697 .712 (17.70 18.08) NOTE
.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 .016 .050 (0.406 1.270)
NOTE: DIMENSIONS
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)
RELATED PARTS
PART NUMBER ®1137A LTC1327 LTC1337 LTC1348 DESCRIPTION Driver, Receiver RS232 Transceiver 3.3V, Driver, Receiver RS562 Transceiver Driver, Receiver RS232 Transceiver 3.3V Driver, Receiver RS232 Transceiver COMMENTS ±15kV 1000-4 300µA Supply Current, 0.2µA Shutdown 300µA Supply Current, Shutdown True RS232 3.3V, Receivers Active Shutdown
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507
WWW.linear.com
Package 28-Lead Plastic Small Outline (Wide .300 Inch)
(Reference 05-08-1620)
.325 ±.005 NOTE .394 .419 (10.007 10.643) .093 .104 (2.362 2.642) .037 .045 (0.940 1.143) .050 (1.270) .014 .019 (0.356 0.482) .004 .012 (0.102 0.305)
(WIDE) 0502
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LINEAR TECHNOLOGY CORPORATION 1993

DESCRIPTIO Supply Current: 300µA Receivers Kept Alive Shutdown Pr

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