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LTC1384 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown
FEATURES
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DESCRIPTIO
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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 LTC1384 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 (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.
APPLICATI
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Notebook Computers Palmtop Computers
TYPICAL APPLICATI
2 0.1F 4 5 0.1F 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 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 5k
232 OUTPUT 232 INPUT
0
LOGIC OUTPUT ON/OFF
10 18 5k
9 16
232 INPUT
1 RX EN
LTC1384 * TA01
U
50
SHUTDOWN CURRENT (A)
UO
UO
SHUTDOWN CURRENT
40 30
QUIESCENT CURRENT
20 10 0
20 40 TEMPERATURE (C)
60
80
LTC1384 * TA02
1
LTC1384 ABSOLUTE AXI U RATI GS
Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range .................... 0C to 70C 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- TR2 OUT RX2 IN 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
TJMAX = 125C, JA = 135C/W
ORDER PART NUMBER LTC1384CG
NC 10
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, EN = 0V, unless otherwise noted.
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 Positive Negative
q q q q q q q q q q
Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown or VCC = 0V (Note 3), VOUT = 20V 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
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TOP VIEW RX EN C1+ V+ C1- C2+ C2 - V- TR2 OUT RX2 IN 1 2 3 4 5 6 7 8 9 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
ORDER PART NUMBER LTC1384CN LTC1384CS
N PACKAGE S PACKAGE 18-LEAD PLASTIC DIP 18-LEAD PLASTIC SOL
TJMAX = 125C, JA = 56C/W
MIN 5.0 - 5.0 2.0
TYP 7.0 - 6.5 1.4 1.4 - 20 12 10
MAX
UNITS V V V V A A mA A V V V k V V
0.8 5 - 40 500
0.8 0.1 3 3.0
q q
1.3 1.7 0.4 5 0.2 3.2
2.4 1 7 0.4
LTC1384
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, EN = 0V, unless otherwise noted.
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 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) Shutdown (Note 3)
q q q q
MIN - 15 10
q
TYP - 40 20 1 8.0 7.5 - 8.0 - 7.0 0.2 0.22 35 1.4 1.4
MAX
10
UNITS mA mA A V V V V ms
0.5 50 0.8
2.0
mA A V V
AC CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL to RS232) Receiver Propagation Delay (RS232 to TTL)
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
q q q q
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
The q denotes specifications which apply over the operating temperature range of 0C TA 70C. 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 PERFORMANCE CHARACTERISTICS
Driver Output Voltage vs Temperature
10 8 RL = 3k
OUTPUT HIGH VCC = 5V
DRIVER OUTPUT VOLTAGE (V)
THRESHOLD 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
LTC1384 * 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
LTC1384 * TPC02
LTC1384 * TPC03
3
LTC1384 TYPICAL PERFORMANCE CHARACTERISTICS
VCC Supply Current vs Temperature
18 16 18 16 50 ISC
-
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
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
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
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
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 EN pin. The supply current of the device drops to 35A (two receivers alive) and both driver outputs are forced into three-state. 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 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
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U
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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
5
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
6
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 DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT 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 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.
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Dimensions in inches (millimeters) unless otherwise noted. G Package 20-Lead SSOP
0.278 - 0.289* (7.07 - 7.33) 20 19 18 17 16 15 14 13 12 11
0.045 (1.14)
0.301 - 0.311 (7.65 - 7.90)
1 2 3 4 5 6 7 8 9 10 0.045 (1.14) 0.068 - 0.078 (1.73 - 1.99)
0 - 8
0.0256 (0.65) BSC
0.010 - 0.015 (0.25 - 0.38)
0.002 - 0.008 (0.05 - 0.21)
20SSOP 0294
N Package 18-Lead Plastic DIP
0.905 (22.860) MAX 18 17 16 15 14 13 12 11 10
0.260 0.010 (6.604 0.254)
1 0.130 0.005 (3.302 0.127)
2
3
4
5
6
7
8
9
0.045 - 0.065 (1.143 - 1.651)
0.015 (0.381) MIN
0.065 (1.651) TYP
0.125 (3.175) MIN
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.018 0.003 (0.457 0.076)
N18 0392
7
LTC1384
PACKAGE DESCRIPTION
0.005 (0.127) RAD MIN
0.291 - 0.299 (7.391 - 7.595) (NOTE 2) 0.010 - 0.029 x 45 (0.254 - 0.737)
0.009 - 0.013 (0.229 - 0.330)
NOTE 1 0.016 - 0.050 (0.406 - 1.270)
NOTE: 1. 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. 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
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Dimensions in inches (millimeters) unless otherwise noted.
S Package 18-Lead Plastic SOL
0.447 - 0.463 (11.354 - 11.760) (NOTE 2) 18 17 16 15 14 13 12 11 10
SEE NOTE
0.394 - 0.419 (10.007 - 10.643)
1
2
3
4
5
6
7
8
9
0.093 - 0.104 (2.362 - 2.642)
0.037 - 0.045 (0.940 - 1.143)
0 - 8 TYP 0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
0.014 - 0.019 (0.356 - 0.482) TYP
SOL18 0392
LT/GP 0594 10K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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