DESCRIPTIO Operates from Single 3.3V Supply Supply Current: 200µA

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DESCRIPTIO Operates from Single 3.3V Supply Supply Current: 200µA

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LTC1385 3.3V Power EIA/TIA-562 Transceiver
DESCRIPTIO
Operates from Single 3.3V Supply Supply Current: 200µA 35µA Driver Disable Mode 0.2µA Shutdown Mode Protection Over ±10kV Uses Small Capacitors: 0.1µF Operates 120kBaud Output Overvoltage Does Force Current Back into Supplies EIA/TIA-562 Lines Forced ±25V Without Damage Compatible with LT1180A
LTC1385 ultra-low power, 2-driver/2-receiver TIA-562 transceiver which operates from single 3.3V supply. charge pump requires only four spacesaving 0.1µF capacitors. transceiver operates three modes: Normal, Driver Disable Shutdown. Normal mode, only 200µA unloaded condition. Driver Disable mode, charge pump turned off, driver outputs forced into three-state, both receivers kept active, drops 35µA. Shutdown mode, everything turned drops 0.2µA. LTC1385 fully compliant with data rate overvoltage TIA-562 specifications. transceiver operate 120kbaud with 1000pF, 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 Driver Disable
0.1µF 0.1µF LOGIC INPUT LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT ON/OFF DRIVER DISABLE
LTC1385 TA01
Quiescent Shutdown Supply Current Temperature
SHUTDOWN CURRENT (µA) QUIESCENT CURRENT SHUTDOWN CURRENT TEMPERATURE (°C)
LTC1385 300k 300k
3.3V
QUIESCENT CURRENT (µA)
0.1µF OUTPUT
0.1µF
OUTPUT INPUT INPUT
TEST CONDITION: 3.3V
LTC1385 TA02
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LTC1385
ABSOLUTE
RATI
Short-Circuit Duration Driver Output Indefinite Receiver Output Indefinite Operating Temperature Range LTC1385C 70°C LTC1385I 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
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
PACKAGE/ORDER ATIO
VIEW DRIVER DISABLE
ON/OFF PACKAGE 20-LEAD SSOP
ORDER PART NUMBER LTC1385CG LTC1385IG
TJMAX 125°C, 135°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 CONDITIONS
denotes specifications which apply over full operating temperature range. 3.3V, 0.1µF, VON/OFF VCC, Driver Disable VCC, unless noted.
Positive Negative
Input Level (VOUT High) Input High Level (VOUT Low) VOUT Shutdown Driver Disable (Note 3,4), VOUT ±20V
VIEW DRIVER DISABLE PACKAGE 18-LEAD PDIP ON/OFF PACKAGE 18-LEAD PLASTIC
ORDER PART NUMBER LTC1385CN LTC1385CSW LTC1385IN LTC1385ISW
TJMAX 125°C, 85°C/W
UNITS
±500
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LTC1385
ELECTRICAL CHARACTERISTICS
PARAMETER 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 Power Supply Supply Current Supply Leakage Current (VCC) Digital Input Threshold Digital Input Threshold High CONDITIONS Input Threshold Input High Threshold
denotes specifications which apply over full operating temperature range. 3.3V, 0.1µF, VON/OFF VCC, Driver Disable VCC, unless noted.
UNITS
Output Low, IOUT 1.6mA (VCC 3.3V) Output High, IOUT 160µA (VCC 3.3V) Sinking Current, VOUT Sourcing Current, VOUT Shutdown (Note VOUT IOUT IOUT IOUT IOUT Shutdown Driver Disable Turn-On Load (Note 70°C Load (Note 40°C 85°C Shutdown (Note Driver Disable (Note
CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL TIA-562) Receiver Propagation Delay (EIA TIA-562 TTL)
denotes specifications which apply over full operating temperature range. 3.3V, 0.1µF, unless noted.
CONDITIONS 51pF 1000pF (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 Driver Disable mode performed with VDRIVER DISABLE VON/OFF VCC. Note Measurements made Shutdown mode performed with VON/OFF
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LTC1385 TYPICAL PERFOR CHARACTERISTICS
Driver Output Voltage Temperature
DRIVER OUTPUT VOLTAGE
THRESHOLD VOLTAGE
OUTPUT HIGH 3.3V
VTH+
DRIVERS WITH LOAD
SUPPLY CURRENT (mA)
OUTPUT 3.3V
TEMPERATURE (°C)
Supply Current Temperature
LEAKAGE CURRENT (µA)
SUPPLY CURRENT (mA)
DRIVERS LOADED
SHORT-CIRCUIT CURRENT (mA)
DRIVER LOADED
TEMPERATURE (°C)
LTC1385 TPC04
Receiver Short-Circuit Current Temperature
SHORT-CIRCUIT CURRENT (mA)
DRIVER OUTPUT 1000pF DRIVER OUTPUT
TEMPERATURE (°C) ISC+ ISC-
LTC1385 TPC06
LTC1385 TPC01
Receiver Input Thresholds Temperature
Supply Current Data Rate
3.3V 2500pF DRIVERS ACTIVE
VTH- TEMPERATURE (°C)
DATA RATE (kBAUD)
LTC1385 TPC02
LTC1385 TPC03
Driver Leakage Shutdown Temperature
Driver Short-Circuit Current Temperature
ISC-
VOUT -20V
ISC+
VOUT
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1385 TPC05
LTC1385 TPC06
Driver Output Waveforms
Receiver Output Waveform
RECEIVER OUTPUT 51pF
INPUT INPUT
LTC1385 TPC08 LTC1385 TPC09
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LTC1385
CTIO
VCC: 3.3V 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 independent Driver Disable pin. supply current drops 0.2µA driver receiver outputs forced into three-state. DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With ON/OFF held high, logic forces part into Driver Disable mode with charge pump turned driver outputs forced into three-state. Both receivers remain active supply current drops 35µA. logic high forces part into Normal mode. Positive Supply Output (EIA/TIA-562 Drivers). 2VCC This requires external capacitor 0.1µF charge storage. capacitor tied ground VCC. With multiple devices, pins share common capacitor. large number devices, increasing size shared common storage capacitors recommended reduce ripple. Negative Supply Output (EIA/TIA-562 Drivers). (2VCC 1.3V). This requires external capacitor 0.1µF charge storage. C1+, C1-, C2+, Commutating Capacitor Inputs. These pins require external capacitors 0.1µF: from C1-, another from maintain charge pump efficiency, capacitor's effective series resistance should less than EIA/TIA-562 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 EIA/TIA-562 Voltage Levels. Outputs high impedance state when Shutdown Driver Disable 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. Outputs high impedance state when Shutdown mode.
SWITCHI WAVEFOR
DRIVER INPUT DRIVER OUTPUT 1.4V 1.4V
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Figure Driver Propagation Delay Timing
INPUT OUTPUT
1.7V
1.3V 2.4V 0.8V
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Figure Receiver Propagation Delay Timing
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LTC1385
TEST CIRCUITS
Driver Timing Test Load Receiver Timing Test Load
DRIVER INPUT
DRIVER OUTPUT DRIVER 51pF
OUTPUT INPUT 51pF
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Test Circuit
0.1µF 0.1µF LOGIC INPUT
LTC1385 300k 300k
0.1µF OUTPUT
0.1µF
LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT
OUTPUT INPUT INPUT
RS562 LINE PINS PROTECTED ±10kV
ON/OFF DRIVER DISABLE
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LTC1385
PACKAGE DESCRIPTIO
.254
.0165 .0015 RECOMMENDED SOLDER LAYOUT
.007 .0098 (0.178 0.249) .016 .050 (0.406 1.270)
NOTE: CONTROLLING DIMENSION: INCHES INCHES DIMENSIONS (MILLIMETERS) DRAWING SCALE *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
.300 .325 (7.620 8.255)
.008 .015 (0.203 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
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 20-Lead Plastic SSOP (5.3mm)
(Reference 05-08-1640)
.337 .344* (8.560 8.737)
.045 ±.005 .058 (1.473) .150 .165
.229 .244 (5.817 6.198)
.150 .157** (3.810 3.988)
.0250
.053 .068 (1.351 1.727)
.004 .0098 (0.102 0.249)
.015 .004 (0.38 0.10)
.008 .012 (0.203 0.305)
.0250 (0.635)
GN20 (SSOP) 0502
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) .120 (3.048) .005 (0.127) .018 .003 (0.457 0.076)
.100 (2.54)
1002
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LTC1385
PACKAGE DESCRIPTIO
.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)
RELATED PARTS
PART NUMBER LT1780/LT1781 LTC1327 LTC1348 LTC1382 LTC1383 LTC1384 LTC1386 DESCRIPTION Driver, Receiver RS232 Transceivers 3.3V, Driver, Receiver RS562 Transceiver 3.3V Driver, Receiver RS232 Transceiver Driver, Receiver RS232 Transceiver Driver, Receiver RS232 Transceiver Driver, Receiver RS232 Transceiver 3.3V, Driver, Receiver RS562 Transceiver COMMENTS ±15kV 1000-4 300µA Supply Current, 0.2µA Shutdown True RS232 3.3V, Receivers Active Shutdown 200µA Supply Current, 0.2µA Shutdown 200µA Supply Current, Narrow 16-Pin 200µA Supply Current, Receivers Active Shutdown 200µA Supply Current, Narrow 16-Pin
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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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LINEAR TECHNOLOGY CORPORATION 1994

DESCRIPTIO Operates from Single 3.3V Supply Supply Current: 200µA

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