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.
APPLICATI
Notebook Computers Palmtop Computers
TYPICAL APPLICATI
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)
LTC1385 300k 300k
3.3V
0.1µF OUTPUT 0.1µF
QUIESCENT CURRENT (µA)
SHUTDOWN CURRENT TEMPERATURE (°C) QUIESCENT CURRENT
OUTPUT INPUT INPUT
TEST CONDITION: 3.3V
LTC1385 TA02
LTC1385 ABSOLUTE RATI
Short-Circuit Duration Driver Output Indefinite Receiver Output Indefinite Operating Temperature Range 70°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
TJMAX 125°C, 135°C/W
Consult factory Industrial Military grade parts.
ELECTRICAL CHARACTERISTICS
3.3V, 0.1µF, VON/OFF VCC, Driver Disable VCC, unless otherwise noted.
PARAMETER Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current CONDITIONS Positive Negative
Input Level (VOUT High) Input High Level (VOUT Low) VOUT Shutdown Driver Disable (Note 3,4), VOUT ±20V
VIEW DRIVER DISABLE ON/OFF
ORDER PART NUMBER LTC1385CN LTC1385CS
PACKAGE PACKAGE 18-LEAD PLASTIC 18-LEAD PLASTIC
TJMAX 125°C, 85°C/W
UNITS
±500
LTC1385
ELECTRICAL CHARACTERISTICS
3.3V, 0.1µF, VON/OFF VCC, Driver Disable VCC, unless otherwise noted.
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 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 Shutdown (Note Driver Disable (Note
UNITS
CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL TIA-562) Receiver Propagation Delay (EIA TIA-562 TTL)
3.3V, 0.1µF, unless otherwise noted.
CONDITIONS 51pF 1000pF (Figure (Figure (Figure (Figure
UNITS V/µs V/µs
denotes specifications which apply over operating temperature range 70°C. 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
LTC1385 TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage Temperature
OUTPUT HIGH 3.3V THRESHOLD VOLTAGE
VTH- TEMPERATURE (°C) DATA RATE (kBAUD)
DRIVER OUTPUT VOLTAGE
VTH+
DRIVERS WITH LOAD
SUPPLY CURRENT (mA)
OUTPUT 3.3V
TEMPERATURE (°C)
Supply Current Temperature
LEAKAGE CURRENT (µA) SUPPLY CURRENT (mA)
DRIVERS LOADED
VOUT VOUT -20V
SHORT-CIRCUIT CURRENT (mA)
DRIVER LOADED
TEMPERATURE (°C)
LTC1385 TPC04
Receiver Short-Circuit Current Temperature
SHORT-CIRCUIT CURRENT (mA)
TEMPERATURE (°C) ISC+ ISC-
LTC1385 TPC06
LTC1385 TPC01
Receiver Input Thresholds Temperature
Supply Current Data Rate
3.3V 2500pF DRIVERS ACTIVE
LTC1385 TPC02
LTC1385 TPC03
Driver Leakage Shutdown Temperature
Driver Short-Circuit Current Temperature
ISC-
ISC+
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1385 TPC05
LTC1385 TPC06
Driver Output Waveforms
DRIVER OUTPUT 1000pF DRIVER OUTPUT
Receiver Output Waveform
RECEIVER OUTPUT 51pF
INPUT INPUT
LTC1385 TPC08 LTC1385 TPC09
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 C2-. 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
1385
Figure Driver Propagation Delay Timing
INPUT OUTPUT
1.7V
1.3V 2.4V 0.8V
1385
Figure Receiver Propagation Delay Timing
LTC1385 TEST CIRCUITS
Driver Timing Test Load Receiver Timing Test Load
DRIVER INPUT
DRIVER OUTPUT DRIVER 51pF
OUTPUT INPUT 51pF
1385
1385
Test Circuit
0.1µF 0.1µF LOGIC INPUT LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT ON/OFF DRIVER DISABLE
1385
LTC1385 300k 300k
0.1µF OUTPUT
0.1µF
OUTPUT INPUT INPUT
RS562 LINE PINS PROTECTED ±10kV
LTC1385
PACKAGE DESCRIPTION
Dimensions inches (millimeters) unless otherwise noted. Package 20-Lead SSOP
0.278 0.289* (7.07 7.33)
0.045 (1.14)
0.301 0.311 (7.65 7.90)
0.205 0.212* (5.20 5.38) 0.045 (1.14) 0.068 0.078 (1.73 1.99)
0.005 0.009 (0.13 0.22)
0.022 0.037 (0.55 0.95)
0.0256 (0.65)
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
0.010 0.015 (0.25 0.38)
0.002 0.008 (0.05 0.21)
20SSOP 0294
Package 18-Lead Plastic
0.905 (22.860)
0.260 0.010 (6.604 0.254)
0.300 0.325 (7.620 8.255) 0.130 0.005 (3.302 0.127)
0.045 0.065 (1.143 1.651)
0.009 0.015 (0.229 0.381)
0.015 (0.381)
0.065 (1.651)
+0.025 0.325 -0.015 8.255 +0.635 -0.381
0.125 (3.175)
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.018 0.003 (0.457 0.076)
0392
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.
LTC1385
PACKAGE DESCRIPTION
0.005 (0.127)
0.291 0.299 (7.391 7.595) (NOTE 0.010 0.029 (0.254 0.737)
0.009 0.013 (0.229 0.330)
NOTE 0.016 0.050 (0.406 1.270)
NOTE: IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS. THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
Dimensions inches (millimeters) unless otherwise noted. Package 18-Lead Plastic
0.447 0.463 (11.354 11.760) (NOTE
NOTE
0.394 0.419 (10.007 10.643)
0.093 0.104 (2.362 2.642)
0.037 0.045 (0.940 1.143)
0.050 (1.270)
0.004 0.012 (0.102 0.305)
0.014 0.019 (0.356 0.482)
SOL18 0392
LT/GP 0594 PRINTED
LINEAR TECHNOLOGY CORPORATION 1994
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