DESCRIPTIO Operates from Single Supply Supply Current: 220µA 35µA
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LTC1384 Power RS232 Transceiver with Receivers Active Shutdown
DESCRIPTIO
Operates from Single Supply Supply Current: 220µA 35µA Shutdown Mode with Both Receivers Kept Alive 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
LTC1384 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 kept active drops 35µA. receiver outputs forced into three-state time using receiver enable (EN) pin. LTC1384 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.
APPLICATI
Notebook Computers Palmtop Computers
TYPICAL APPLICATI
0.1µF 0.1µF 300k LOGIC INPUT LOGIC OUTPUT LTC1384 300k
2-Drivers/2-Receivers with Shutdown Receiver Enable
0.1µF
QUIESCENT CURRENT (µA)
Quiescent Shutdown Supply Current Temperature
1200 TEST CONDITION: 1000
0.1µF
LOGIC INPUT
OUTPUT
OUTPUT INPUT
LOGIC OUTPUT ON/OFF
INPUT
LTC1384 TA01
SHUTDOWN CURRENT (µA)
SHUTDOWN CURRENT
QUIESCENT CURRENT
TEMPERATURE (°C)
LTC1384 TA02
LTC1384 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 ON/OFF PACKAGE 20-LEAD SSOP
TJMAX 125°C, 135°C/W
ORDER PART NUMBER LTC1384CG
Consult factory Industrial Military grade parts.
ELECTRICAL CHARACTERISTICS
0.1µF, VON/OFF VCC, unless otherwise noted.
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 CONDITIONS Positive Negative
Input Level (VOUT High) Input High Level (VOUT Low) VOUT Shutdown (Note VOUT ±20V Input Threshold Input High Threshold Output Low, IOUT 1.6mA (VCC Output High, IOUT 160µA (VCC
VIEW ON/OFF
ORDER PART NUMBER LTC1384CN LTC1384CS
PACKAGE PACKAGE 18-LEAD PLASTIC 18-LEAD PLASTIC
TJMAX 125°C, 56°C/W
UNITS
±500
LTC1384
ELECTRICAL CHARACTERISTICS
0.1µF, VON/OFF VCC, unless otherwise noted.
PARAMETER 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 Sinking Current, VOUT Sourcing Current, VOUT VCC, VOUT IOUT IOUT IOUT IOUT Shutdown Turn-On Load (Note Shutdown (Note
0.22
UNITS
CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL RS232) Receiver Propagation Delay (RS232 TTL)
0.1µF, unless otherwise noted.
CONDITIONS 51pF 2500pF (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 Shutdown mode performed with VON/OFF
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage Temperature
OUTPUT HIGH
DRIVER OUTPUT VOLTAGE
THRESHOLD VOLTAGE
TEMPERATURE (°C) OUTPUT 4.5V
SUPPLY CURRENT (mA)
4.5V
LTC1384 TPC01
Receiver Input Thresholds Temperature
Supply Current Data Rate
2500pF DRIVERS ACTIVE
TEMPERATURE (°C)
DATA RATE (kBAUD)
LTC1384 TPC02
LTC1384 TPC03
LTC1384 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current Temperature
SHORT-CIRCUIT CURRENT (mA)
SUPPLY CURRENT (mA)
TEMPERATURE (°C) DRIVER LOADED DRIVERS LOADED
SHORT-CIRCUIT CURRENT (mA)
LTC1384 TPC04
Driver Leakage Shutdown Temperature
LEAKAGE CURRENT (µA)
TEMPERATURE (°C) VOUT VOUT -20V
LTC1384 TPC07
Driver Short-Circuit Current Temperature
Receiver Short-Circuit Current Temperature
ISC+
ISC-
ISC+
TEMPERATURE (°C) TEMPERATURE (°C)
LTC1384 TPC05
LTC1384 TPC06
Driver Output Waveforms
DRIVER OUTPUT 2500pF DRIVER OUTPUT INPUT
Receiver Output Waveforms
RECEIVER OUTPUT 51pF
INPUT
LTC1384 TPC08
LTC1384 TPC09
LTC1384
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 independent pin. supply current device drops 35µA (two receivers alive) both driver outputs forced into three-state. TTL/CMOS Compatible Receiver Enable Pin. logic high forces receiver outputs into three-state. logic enables receiver outputs. 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+, 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. logic high puts outputs into three-state.
SWITCHI WAVEFOR
DRIVER INPUT DRIVER OUTPUT 1.4V 1.4V
LTC1384
Figure Driver Propagation Delay Timing
INPUT OUTPUT
1.7V
1.3V 2.4V 0.8V
LTC1384
Figure Receiver Propagation Delay Timing
LTC1384 TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF
Receiver Timing Test Load
OUTPUT INPUT 51pF
DRIVER INPUT
LTC1384 TA04
LTC1384 TA03
Test Circuit
0.1µF 0.1µF 300k LOGIC INPUT LOGIC OUTPUT OUTPUT INPUT RS232 LINE PINS PROTECTED ±10kV LTC1384 300k 0.1µF 0.1µF
LOGIC INPUT
OUTPUT
LOGIC OUTPUT ON/OFF
INPUT
LTC1384 TA04
LTC1384
PACKAGE DESCRIPTION
0.205 0.212* (5.20 5.38)
0.005 0.009 (0.13 0.22)
0.022 0.037 (0.55 0.95)
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
0.300 0.325 (7.620 8.255)
0.009 0.015 (0.229 0.381)
+0.025 0.325 -0.015 8.255 +0.635 -0.381
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.
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)
0.045 (1.14) 0.068 0.078 (1.73 1.99)
0.0256 (0.65)
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)
0.130 0.005 (3.302 0.127)
0.045 0.065 (1.143 1.651)
0.015 (0.381)
0.065 (1.651)
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
LTC1384
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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