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LTC1382 5V Low Power RS232 Transceiver with Shutdown
FEATURES

DESCRIPTIO
Operates from a Single 5V Supply Low Supply Current: ICC = 220A ICC = 0.2A in Shutdown Mode ESD Protection Over 10kV Uses Small Capacitors: 0.1F Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to 25V Without Damage Pin Compatible with LT1180A
The LTC(R)1382 is an ultra-low power 2-driver/2-receiver RS232 transceiver that operates from a single 5V supply. The charge pump requires only four spacesaving 0.1F capacitors. The transceiver operates in one of two modes, Normal and Shutdown. In the Normal mode, ICC is only 220A with the driver outputs unloaded. In the Shutdown mode, the charge pump is turned off, the driver outputs are forced into three-state, both receivers are off and ICC drops to 0.2A. The LTC1382 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120kbaud with a 2500pF, 3k load. Both driver outputs and receiver inputs can be forced to 25V without damage and can survive multiple 10kV ESD strikes.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S

Notebook Computers Palmtop Computers
TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown
2 0.1F 4 5 0.1F 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 5k 8 14 232 OUTPUT 232 INPUT LTC1382 VCC 300k 15 17 3 7 0.1F 0.1F VCC = 5V
Quiescent and Shutdown Supply Current vs Temperature
600 TEST CONDITION: VCC = 5V 500 1.0 1.2
QUIESCENT CURRENT (A)
400 300 200 100 0 -20 SHUTDOWN CURRENT QUIESCENT CURRENT
LOGIC INPUT
232 OUTPUT
LOGIC OUTPUT ON/OFF
10 18 5k
9 16
232 INPUT
0
LTC1382 * TA01
U
SHUTDOWN CURRENT (A)
0.8 0.6 0.4 0.2 0 20 40 TEMPERATURE (C) 60 80
LTC1382 * TA02
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LTC1382
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC 1 C1+ 2 V
+
Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... - 0.3V to V CC + 0.3V Receiver ............................................... - 25V to 25V Digital Input ............................... - 0.3V to VCC + 0.3V Output Voltage Driver .................................................... - 25V to 25V Receiver .................................... - 0.3V to VCC + 0.3V Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1382C ............................................... 0C to 70C LTC1382I ............................................ - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
18 ON/OFF 17 VCC 16 GND 15 TR1 OUT 14 RX1 IN 13 RX1 OUT 12 TR1 IN 11 TR2 IN 10 RX2 OUT SW PACKAGE 18-LEAD PLASTIC SO
ORDER PART NUMBER LTC1382CN LTC1382CSW LTC1382IN LTC1382ISW
3
C1- 4 C2+ 5 C2- 6 V- 7 TR2 OUT 8 RX2 IN 9 N PACKAGE 18-LEAD PDIP
TJMAX = 125C, JA = 65C/W (N) TJMAX = 125C, JA = 85C/W (S)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS
PARAMETER Any Driver Output Voltage Swing Logic Input Voltage Level Logic Input Current Output Short-Circuit Current Output Leakage Current Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Output Leakage Current CONDITIONS 3k to GND
The denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, unless otherwise noted.
MIN Positive Negative

TYP 7.0 - 6.5 1.4 1.4 - 20 12 10 1.3 1.7 0.4 5 0.2 3.2 - 40 20 1
MAX
UNITS V V V V A A mA A V V V k V V mA mA A
5.0 - 5.0 2.0
Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown or VCC = 0V (Note 3), VOUT = 10V Input Low Threshold Input High Threshold - 10V VIN 10V Output Low, IOUT = - 1.6mA (VCC = 5V) Output High, IOUT = 160A (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current VOUT = 0V Shutdown (Note 3), 0V VOUT VCC
0.8 5 - 40 500
9

0.8 0.1 3 3.0 - 15 10
2.4 1 7 0.4
10
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LTC1382
DC ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Generator V + Output Voltage V - Output Voltage Supply Rise Time Power Supply VCC Supply Current Supply Leakage Current (VCC) Digital Input Threshold Low Digital Input Threshold High CONDITIONS IOUT = 0mA IOUT = 8mA IOUT = 0mA IOUT = - 8mA Shutdown to Turn-On
The denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, unless otherwise noted.
MIN TYP 8.0 7.5 - 8.0 - 7.0 0.2

MAX
UNITS V V V V ms
No Load (Note 2), 0C to 70C No Load (Note 2), - 40C to 85C Shutdown (Note 3)
2.0
0.22 0.35 0.2 1.4 1.4
0.5 1.0 10 0.8
mA mA A V V
AC CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL)
The denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
CONDITIONS RL = 3k, CL = 51pF RL = 3k, CL = 2500pF t HLD (Figure 1) t LHD (Figure 1) t HLR (Figure 2) t LHR (Figure 2) MIN 3

TYP 8 5 2 2 0.3 0.3
MAX 30 3.5 3.5 0.8 0.8
UNITS V/s V/s s s s s
Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: Supply current is measured with driver and receiver outputs unloaded.
Note 3: Measurements made in the Shutdown mode are performed with VON/OFF = 0V.
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage vs Temperature
10 8 RL = 3k OUTPUT HIGH VCC = 5V
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
4 2 0 -2 -4 -6 -8 0 10 20 30 40 50 TEMPERATURE (C) 60 70 OUTPUT LOW VCC = 4.5V VCC = 5V
SUPPLY CURRENT (mA)
6
VCC = 4.5V
LTC1382 * TPC01
UW
Receiver Input Thresholds vs Temperature
2.2 2.0 VTH 1.8 1.6 1.4 1.2
5 35 30 25 20 15 10 45 40
Supply Current vs Data Rate
VCC = 5V RL = 3k CL = 2500pF 2 DRIVERS ACTIVE
VTL
1.0 0 10 40 30 50 20 TEMPERATURE (C) 60 70
0 0 25 50 75 100 125 DATA RATE (kBAUD) 150 175
LTC1382 * TPC02
LTC1382 * TPC03
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LTC1382 TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current vs Temperature
18 16
SHORT-CIRCUIT CURRENT (mA)
SUPPLY CURRENT (mA)
14 12 10 8 6 4 2 0 0 10 20 30 40 50 TEMPERATURE (C) 60 70 1 DRIVER LOADED RL = 3k 2 DRIVERS LOADED RL = 3k
14 12 10 8 6 4 2 0 0
ISC
-
SHORT-CIRCUIT CURRENT (mA)
LTC1382 * TPC04
Driver Leakage in Shutdown vs Temperature
45 40
LEAKAGE CURRENT (A)
35 30 25 20 15 10 5 0 0 10 30 20 40 50 TEMPERATURE (C) 60 70 VOUT = 20V VOUT = -20V
LTC1349 * TPC05
4
UW
Driver Short-Circuit Current vs Temperature
18 16
50
Receiver Short-Circuit Current vs Temperature
ISC+
40
ISC-
30
20
ISC+
10
10
20 30 40 50 TEMPERATURE (C)
60
70
0
10
30 20 50 40 TEMPERATURE (C)
60
70
LTC1382 * TPC05
LTC1382 * TPC06
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k INPUT
Receiver Output Waveforms
RECEIVER OUTPUT CL = 51pF
INPUT
LTC1382 * TPC08
LTC1382 * TPC09
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PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic low puts the device in the Shutdown mode. Both driver outputs are forced into three-state and the supply current is 0.2A. V +: Positive Supply Output (RS232 Drivers). V + 2VCC - 2V. This pin requires an external capacitor C = 0.1F for charge storage. The capacitor may be tied to ground or VCC. With multiple devices, the V + and V - pins may share a common capacitor. For large numbers of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V -: Negative Supply Output (RS232 Drivers). V - - (2VCC - 2V). This pin requires an external capacitor C = 0.1F for charge storage. C1+, C1-, C2+, C2-: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1F: one from C1+ to C1- and another from C2+ to C2 -. To maintain charge pump efficiency, the capacitor's effective series resistance should be less than 2. TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left unconnected since 300k input pull-up resistors to VCC are included on chip. To minimize power consumption, the internal driver pull-up resistors are disconnected from VCC in the Shutdown mode. TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in the Shutdown or VCC = 0V. The driver outputs are protected against ESD to 10kV for human body model discharges. RX IN: Receiver Inputs. These pins can be forced to 25V without damage. The receiver inputs are protected against ESD to 10kV for human body model discharges. Each receiver provides 0.4V of hysteresis for noise immunity. RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels. Outputs are in a high impedance state when in the Shutdown mode.
SWITCHI G TI E WAVEFOR S
DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
LTC1382 * F01
Figure 1. Driver Propagation Delay Timing
W
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RX INPUT RX OUTPUT t LHR
1.7V
VCC 1.3V 0V 2.4V VCC 0V
LTC1382 * F02
0V
V-
0.8V t HLR
Figure 2. Receiver Propagation Delay Timing
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LTC1382
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF 3k
Receiver Timing Test Load
RX OUTPUT RX INPUT RX 51pF
DRIVER INPUT
LTC1382 * TA03
LTC1382 * TA04
ESD Test Circuit
2 0.1F 4 5 0.1F 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 5k 8 14 232 OUTPUT 232 INPUT RS232 LINE PINS PROTECTED TO 10kV LTC1382 VCC 300k 15 17 3 7 0.1F 0.1F VCC = 5V
LOGIC INPUT
232 OUTPUT
LOGIC OUTPUT ON/OFF
10 18 5k
9 16
232 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 DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
.030 .005 TYP N
.420 MIN
1
2
3
RECOMMENDED SOLDER PAD LAYOUT .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737)
0 - 8 TYP
.005 (0.127) RAD MIN
.009 - .013 (0.229 - 0.330) NOTE: 1. DIMENSIONS IN
NOTE 3 .016 - .050 (0.406 - 1.270)
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
N Package 18-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.900* (22.860) MAX 18 17 16 15 14 13 12 11 10 .255 .015* (6.477 0.381) 1 .130 .005 (3.302 0.127) .020 (0.508) MIN 2 3 4 5 6 7 8 9 .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .125 (3.175) MIN .005 (0.127) MIN .018 .003 (0.457 0.076) .100 (2.54) BSC
N18 0502
SW Package 18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 .005 .447 - .463 (11.354 - 11.760) NOTE 4 18 17 16 15 14 13 12 11 10
N .325 .005
NOTE 3
.394 - .419 (10.007 - 10.643)
N/2 N/2
1 .093 - .104 (2.362 - 2.642)
2
3
4
5
6
7
8
9 .037 - .045 (0.940 - 1.143)
.050 (1.270) BSC
.004 - .012 (0.102 - 0.305)
.014 - .019 (0.356 - 0.482) TYP
S18 (WIDE) 0502
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LTC1382
RELATED PARTS
PART NUMBER LT1780/LT1781 LTC1383 LTC1384 LTC1385 LTC1386 DESCRIPTION 5V, 2 Driver, 2 Receiver RS232 Transeivers 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver COMMENTS 15kV ESD per IEC 1000-4 220A Supply Current, Narrow 16-pin SO 220A Supply Current, 2 Receivers Active in Shutdown 220A Supply Current, 2 Receivers Active in Shutdown 220A Supply Current, Narrow 16-pin SO
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 FAX: (408) 434-0507 linear.com
LW/TP 1002 1K REV A * PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1994

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