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LTC1384 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown
FEATURES

DESCRIPTIO

Operates from a Single 5V Supply Low Supply Current: ICC = 220A ICC = 35A in Shutdown Mode with Both Receivers Kept Alive 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)1384 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 kept active and ICC drops to 35A. The receiver outputs may be forced into three-state at any time using the receiver enable (RX EN) pin. The LTC1384 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 0.1F 4 5 0.1F 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 5k 10 18 5k LTC1384 VCC 300k
2-Drivers/2-Receivers with Shutdown and Receiver Enable
17 3 7 0.1F
QUIESCENT CURRENT (A)
Quiescent and Shutdown Supply Current vs Temperature
1200 60 TEST CONDITION: VCC = 5V 1000
0.1F
VCC = 5V
800 600 400 200 0 -20
LOGIC INPUT
15
232 OUTPUT
8 14
232 OUTPUT 232 INPUT
0
LOGIC OUTPUT ON/OFF
9 16
232 INPUT
1 RX EN
LTC1384 * TA01
U
50
SHUTDOWN CURRENT (A)
U
U
SHUTDOWN CURRENT
40 30
QUIESCENT CURRENT
20 10 0
20 40 TEMPERATURE (C)
60
80
LTC1384 * TA02
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LTC1384
ABSOLUTE
AXI U
RATI GS
Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1384C ............................................... 0C to 70C LTC1384I ............................................ - 40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW RX EN C1 + V+ C1 - C2 + C2 - V
-
1 2 3 4 5 6 7 8 9
20 ON/OFF 19 VCC 18 GND 17 TR1 OUT 16 RX1 IN 15 RX1 OUT 14 TR1 IN 13 TR2 IN 12 RX2 OUT 11 NC G PACKAGE 20-LEAD SSOP
ORDER PART NUMBER LTC1384CG LTC1384IG
TR2 OUT RX2 IN
NC 10
TJMAX = 125C, JA = 135C/W
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 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, RX EN = 0V, unless otherwise noted.
MIN Positive Negative

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)
2
U
U
W
WW U
W
TOP VIEW RX EN 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2- 6 V- 7 TR2 OUT 8 RX2 IN 9 N PACKAGE 18-LEAD PDIP 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 LTC1384CN LTC1384CSW LTC1384IN LTC1384ISW
TJMAX = 125C, JA = 65C/W
TJMAX = 125C, JA = 85C/W
TYP 7.0 - 6.5 1.4 1.4 - 20 12 10 1.3 1.7 0.4 5 0.2 3.2
MAX
UNITS V V V V A A mA A V V V k V V
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5.0 - 5.0 2.0
0.8 5 - 40 500
9

0.8 0.1 3 3.0
2.4 1 7 0.4
LTC1384
DC ELECTRICAL CHARACTERISTICS
PARAMETER Output Short-Circuit Current Output Leakage Current 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
The denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, RX EN = 0V, unless otherwise noted.
CONDITIONS Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V EN = VCC, 0V VOUT VCC IOUT = 0mA IOUT = 8mA IOUT = 0mA IOUT = - 8mA Shutdown to Turn-On No Load (Note 2), 0C to 70C No Load (Note 2), -40C to 85C Shutdown (Note 3)

MIN - 15 10
TYP - 40 20 1 8.0 7.5 - 8.0 - 7.0 0.2 0.22 0.35 35 1.4 1.4
MAX
10
UNITS mA mA A V V V V ms
0.5 1.0 50 0.8
2.0
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
DRIVER OUTPUT VOLTAGE (V)
RL = 3k
OUTPUT HIGH VCC = 5V
VCC = 4.5V
SUPPLY CURRENT (mA)
6 4 2 0 -2 -4 -6 -8 0 10
THRESHOLD VOLTAGE (V)
OUTPUT LOW VCC = 4.5V VCC = 5V 20 30 40 50 TEMPERATURE (C) 60 70
UW
Receiver Input Thresholds vs Temperature
2.2 2.0 VTH 1.8 1.6 1.4 1.2 5 1.0 0 10 40 30 50 20 TEMPERATURE (C) 60 70 0 VTL 35 30 25 20 15 10 45 40
Supply Current vs Data Rate
VCC = 5V RL = 3k CL = 2500pF 2 DRIVERS ACTIVE
0
25
50 75 100 125 DATA RATE (kBAUD)
150
175
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LTC1384 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- ISC+
SHORT-CIRCUIT CURRENT (mA)
LTC1384 * 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
LTC1384 * TPC07
4
UW
Driver Short-Circuit Current vs Temperature
18 16
Receiver Short-Circuit Current vs Temperature
50
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
LTC1384 * TPC05
LTC1384 * TPC06
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k INPUT
Receiver Output Waveforms
RECEIVER OUTPUT CL = 51pF
INPUT
LTC1384 * TPC08
LTC1384 * TPC09
5s/DIV
5s/DIV
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LTC1384
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 independent of the RX EN pin. The supply current of the device drops to 35A (two receivers alive) and both driver outputs are forced into three-state. RX EN: TTL/CMOS Compatible Receiver Enable Pin. A logic high forces the receiver outputs into three-state. A logic low enables the receiver outputs. 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. A logic high at RX EN puts the outputs into three-state.
SWITCHI G TI E WAVEFOR S
DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
LTC1384 * F01
Figure 1. Driver Propagation Delay Timing
W
W
U
U
U
U
RX INPUT RX OUTPUT t LHR
1.7V
VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V
LTC1384 * F02
0V V
-
Figure 2. Receiver Propagation Delay Timing
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LTC1384
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF 3k
Receiver Timing Test Load
RX OUTPUT RX INPUT RX 51pF
DRIVER INPUT
LTC1384 * TA04
LTC1384 * TA03
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 LTC1384 VCC 300k 15 17 3 7 0.1F 0.1F VCC
LOGIC INPUT
232 OUTPUT
LOGIC OUTPUT ON/OFF
10 18 5k
9 16
232 INPUT
LTC1384 * TA04
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LTC1384
PACKAGE DESCRIPTIO
7.8 - 8.2
0.42 0.03 RECOMMENDED SOLDER PAD LAYOUT 5.00 - 5.60** (.197 - .221)
0.09 - 0.25 (.0035 - .010)
0.55 - 0.95 (.022 - .037)
NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED .152mm (.006") PER SIDE **DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED .254mm (.010") PER 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 DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
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
G Package 20-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
6.90 - 7.50* (.272 - .295 ) 1.25 0.12 20 19 18 17 16 15 14 13 12 11 5.3 - 5.7 7.40 - 8.20 (.291 - .323) 0.65 BSC 1 2 3 4 5 6 7 8 9 10 2.0 (.079)
0 - 8
0.65 (.0256) BSC
0.22 - 0.38 (.009 - .015)
0.05 (.002)
G20 SSOP 0802
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 .120 (3.048) MIN .005 (0.127) MIN .018 .003 (0.457 0.076)
.100 (2.54) BSC
N18 1002
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LTC1384
PACKAGE DESCRIPTIO
.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)
RELATED PARTS
PART NUMBER LT1780/LT1781 LTC1382 LTC1383 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, 0.2A in Shutdown 220A Supply Current, Narrow 16-pin SO 220A Supply Current, 2 Receivers Active in Shutdown 220A Supply Current, Narrow 16-pin SO
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 FAX: (408) 434-0507
WWW.linear.com
U
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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LINEAR TECHNOLOGY CORPORATION 1994

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