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LTC1386 3.3V Low Power EIA/TIA562 Transceiver
FEATURES

DESCRIPTIO
Operates from a Single 3.3V Supply Low Supply Current: ICC = 200A ESD Protection Over 10kV Available in 16-Pin SOIC Narrow Package Uses Small Capacitors: 0.1F Operates to 120kBaud Output Overvoltage Does Not Force Current Back into Supplies EIA/TIA562 I/O Lines Can Be Forced to 25V Without Damage Pin Compatible with LT1181A
The LTC(R)1386 is an ultra-low power 2-driver/2-receiver EIA/TIA562 transceiver that operates from a single 3.3V supply. The charge pump requires only four space-saving 0.1F capacitors. The supply current (ICC) of the transceiver is only 200A with driver outputs unloaded. The LTC1386 is fully compliant with all data rate and overvoltage EIA/TIA562 specifications. The transceiver can operate up to 120kbaud with a 1000pF, 3k load. Both driver outputs and receiver inputs can be forced to 25V without damage and can survive multiple 10kV ESD strikes.
APPLICATIO S

Notebook Computers Palmtop Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
1 0.1F 3 4 0.1F 5 11 VCC 300k LOGIC INPUT LOGIC OUTPUT 10 12 5k LTC1386 VCC 300k
Quiescent Supply Current vs Temperature
16 2 6 0.1F 0.1F
QUIESCENT CURRENT (A) 600
VCC = 3.3V
500 400
TEST CONDITION: VCC = 3.3V
LOGIC INPUT
14
300 200 100 0 -20
562 OUTPUT
7 13
562 OUTPUT 562 INPUT
0
LOGIC OUTPUT
9 5k
8 15
562 INPUT
LTC1386 * TA01
U
QUIESCENT CURRENT 20 40 TEMPERATURE (C) 60 80
LTC1386 * TA02
U
U
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LTC1386
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW C1+ V
+
Supply Voltage (VCC) ................................................ 5V 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 LTC1386C ............................................... 0C to 70C LTC1386I ............................................ - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER
16 VCC 15 GND 14 TR1 OUT 13 RX1 IN 12 RX1 OUT 11 TR1 IN 10 TR2 IN 9 RX2 OUT
1 2 3 4 5 6 7 8
C1- C2+ C2 - V
-
LTC1386CS LTC1386IS
TR2 OUT RX2 IN
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 125C, JA = 95C/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 Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Power Supply Generator V + Output Voltage V - Output Voltage Power Supply VCC Supply Current CONDITIONS 3k to GND
The denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
MIN Positive Negative

TYP 4.5 - 4.5 1.4 1.4 - 20 10 1.3 1.7 0.4 5 0.2 3.2 - 20 7 5.7 5.5 - 5.3 - 5.0
MAX
UNITS V V V V A A mA V V V k V V mA mA V V V V
3.7 - 3.7 2.0
Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Input Low Threshold Input High Threshold - 10V VIN 10V Output Low, IOUT = - 1.6mA (VCC = 3.3V) Output High, IOUT = 160A (VCC = 3.3V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = GND IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = - 5mA No Load (Note 2), 0C to 70C No Load (Note 2), - 40C to 85C
0.8 5 - 40
9

0.8 0.1 3 3.0 -5 2
2.4 1 7 0.4

0.2 0.35
0.5 1.0
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mA mA
W
U
U
WW
W
LTC1386
AC CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL to EIA/TIA562) Receiver Propagation Delay (EIA/TIA562 to TTL )
The denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
CONDITIONS RL = 3k, CL = 51pF RL = 3k, CL = 1000pF 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=OV.
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage vs Temperature
5 4 OUTPUT HIGH VCC = 3.3V
DRIVER OUTPUT VOLTAGE (V)
THRESHOLD VOLTAGE (V)
3 2 1 0 -1 -2 -3 -4 -5 0 10
1.8 1.6 1.4
VTH+
ALL DRIVERS WITH LOAD RL = 3k
SUPPLY CURRENT (mA)
OUTPUT LOW VCC = 3.3V
40 30 20 50 TEMPERATURE (C)
VCC Supply Current vs Temperature
4.5 4.0
SUPPLY CURRENT (mA)
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10
2 DRIVERS LOADED RL = 3k
1 DRIVER LOADED RL = 3k
20 30 40 50 TEMPERATURE (C)
LTC1386 * TPC04
UW
60 70
LTC1386 * TPC01
Receiver Input Thresholds vs Temperature
2.2 2.0 15 20
Supply Current vs Data Rate
VCC = 3.3V RL = 3k CL = 2500pF ALL DRIVERS ACTIVE
10
VTH- 1.2 1.0 0 10 40 50 30 20 TEMPERATURE (C) 60 70
5
0 0 20 40 80 100 60 DATA RATE (kBAUD) 120 140
LTC1386 * TPC02
LTC1386 * TPC03
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k
Receiver Output Waveforms
RECEIVER OUTPUT CL = 51pF
INPUT INPUT
LTC1386 * TPC05 LTC1386 * TPC06
5s/DIV
60 70
5s/DIV
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LTC1386
PI FU CTIO S
VCC: 3.3V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor. GND: Ground Pin. Positive Supply Output (EIA/TIA562 Drivers). 2VCC - 1V. 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 - 1.3V). 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 V +: V+ charge pump efficiency, the capacitor's effective series resistance should be less than 2. TR IN: EIA/TIA562 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. TR OUT: Driver Outputs at EIA/TIA562 Voltage Levels. 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.
SWITCHI G TI E WAVEFOR S
DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
LTC1386 * F01
Figure 1. Driver Propagation Delay Timing
RX INPUT RX OUTPUT t LHR
1.7V
Figure 2. Receiver Propagation Delay Timing
4
W
W
U
U
U
U
0V
V-
VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V
LTC1386 * F02
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LTC1386
TEST CIRCUITS
Driver Timing Test Load Receiver Timing Test Load
DRIVER INPUT
DRIVER OUTPUT DRIVER 51pF 3k
RX OUTPUT RX INPUT RX 51pF
LTC1386 * TA04
LTC1386 * TA03
ESD Test Circuit
1 0.1F 0.1F LOGIC INPUT 3 4 5 VCC 11 VCC LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 10 12 9 5k 5k 300k 7 13 8 562 OUTPUT 562 INPUT 562 INPUT RS562 LINE PINS PROTECTED TO 10kV 300k 14 LTC1386 16 2 6 0.1F 562 OUTPUT 0.1F VCC
15
1386 TA05
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LTC1386
TYPICAL APPLICATIO S
Paralleling Power Supply Generator with Common Storage Capacitors
1 0.1F 3 4 0.1F 5 11 VCC 300k LOGIC INPUT LOGIC OUTPUT 10 12 5k 9 5k LTC1386 VCC 300k
LOGIC INPUT
LOGIC OUTPUT
6
U
16 2 6
VCC = 3.3V 0.1F 0.1F
1 0.1F 3 4 0.1F 5 11 VCC 300k LTC1386 VCC 300k
16 2 6
VCC = 3.3V
14
562 OUTPUT
LOGIC INPUT
562 OUTPUT
7 13
562 OUTPUT 562 INPUT
LOGIC INPUT LOGIC OUTPUT
10 12 5k 9 5k
7 13
562 OUTPUT 562 INPUT
8 15
562 INPUT
LOGIC OUTPUT
562 INPUT 15
LTC1386 * TA06
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LTC1386
PACKAGE DESCRIPTIO
S Package 16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.386 - .394 (9.804 - 10.008) NOTE 3 16 15 14 13 12 11 10 9
.050 BSC N
.245 MIN
1 .030 .005 TYP
2
3
N/2
RECOMMENDED SOLDER PAD LAYOUT 1
.010 - .020 x 45 (0.254 - 0.508)
.008 - .010 (0.203 - 0.254)
0 - 8 TYP
.016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. 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
.045 .005 N .160 .005 .228 - .244 (5.791 - 6.197) N/2 .150 - .157 (3.810 - 3.988) NOTE 3 2 3 4 5 6 7 8 .053 - .069 (1.346 - 1.752) .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
S16 0502
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LTC1386
RELATED PARTS
PART NUMBER LT1780/LT1781 LTC1327 LTC1348 LTC1382 LTC1383 LTC1384 LTC1385 DESCRIPTION 5V, 2 Driver, 2 Receiver RS232 Transeivers 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 5V, 2 Driver, 2 Receiver RS232 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver COMMENTS 15kV ESD per IEC 1000-4 300A Supply Current, 0.2A in Shutdown True RS232 on 3.3V, 5 Receivers Active in Shutdown 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, 2 Receivers Active in Shutdown
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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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