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LTC1385 3.3V Low Power EIA/TIA-562 Transceiver
FEATURES
s s s s s s s s
DESCRIPTIO
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Operates from a Single 3.3V Supply Low Supply Current: ICC = 200A ICC = 35A in Driver Disable Mode 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 EIA/TIA-562 I/O Lines Can Be Forced to 25V Without Damage Pin Compatible with LT1180A
The LTC(R)1385 is an ultra-low power, 2-driver/2-receiver EIA / TIA-562 transceiver which operates from a single 3.3V supply. The charge pump requires only four spacesaving 0.1F capacitors. The transceiver operates in one of three modes: Normal, Driver Disable or Shutdown. In the Normal mode, ICC is only 200A in the unloaded condition. In the Driver Disable 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. In the Shutdown mode, everything is turned off and ICC drops to 0.2A. The LTC1385 is fully compliant with all data rate and overvoltage EIA / TIA-562 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s
Notebook Computers Palmtop Computers
TYPICAL APPLICATIO
2-Drivers/2-Receivers with Shutdown and Driver Disable
2 0.1F 0.1F LOGIC INPUT 4 5 6 VCC 12 VCC LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT 11 13 10 5k 5k ON/OFF 18 1 DRIVER DISABLE
LTC1385 * TA01
Quiescent and Shutdown Supply Current vs Temperature
600 1.2 1.0
SHUTDOWN CURRENT (A)
17 LTC1385 3 7 300k 15 300k 8 14 9
VCC = 3.3V
500
QUIESCENT CURRENT (A)
0.1F 562 OUTPUT
0.1F
400 300 200 100 0 -20 SHUTDOWN CURRENT 0 20 40 TEMPERATURE (C) 60 QUIESCENT CURRENT
562 OUTPUT 562 INPUT 562 INPUT
16
TEST CONDITION: VCC = 3.3V
LTC1385 * TA02
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0.8 0.6 0.4 0.2 0 80
sn1385 1385fas
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1
LTC1385
ABSOLUTE
AXI U
RATI GS
Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range LTC1385C ............................................. 0C to 70C LTC1385I ........................................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW DRIVER DISABLE C1 + V+ C1
-
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 LTC1385CG LTC1385IG
C2 + C2 - V- 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 CONDITIONS 3k to GND
The q denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, Driver Disable = VCC, unless noted.
MIN Positive Negative
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 Driver Disable or VCC = 0V (Note 3,4), VOUT = 20V
2
U
U
W
WW U
W
TOP VIEW DRIVER DISABLE 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 LTC1385CN LTC1385CSW LTC1385IN LTC1385ISW
TJMAX = 125C, JA = 85C/W
TYP 4.5 - 4.5 1.4 1.4 - 20 10 10
MAX
UNITS V V V V A A mA A
3.7 - 3.7 2.0
0.8 5 - 40 500
sn1385 1385fas
LTC1385
DC ELECTRICAL CHARACTERISTICS
PARAMETER Any Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Voltage 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 Input Low Threshold Input High Threshold
The q denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, VON/OFF = VCC, Driver Disable = VCC, unless noted.
MIN
q q q
TYP 1.3 1.7 0.4 5 0.2 3.2 - 20 7 1 5.7 5.5 - 5.3 - 5.0 0.2
MAX
UNITS V V V k V V mA mA A V V V V ms
0.8 0.1 3 3.0 -5 2
- 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 = 0V Shutdown (Note 4), 0V VOUT VCC IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = - 5mA Shutdown or Driver Disable to Turn-On No Load (Note 2), 0C to 70C No Load (Note 2), - 40C to 85C Shutdown (Note 4) Driver Disable (Note 3)
q q
2.4 1.0 7 0.4
q
10
q q q q q q
2.0
0.2 3.5 0.2 35 1.4 1.4
0.5 1.0 10 50 0.8
mA mA A A V V
AC CHARACTERISTICS
PARAMETER Slew Rate Driver Propagation Delay (TTL to EIA / TIA-562) Receiver Propagation Delay (EIA / TIA-562 to TTL)
The q denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, unless 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
q q q q
TYP 8 5 2 2 0.3 0.2
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 Driver Disable mode are performed with VDRIVER DISABLE = GND and VON/OFF = VCC. Note 4: Measurements made in the Shutdown mode are performed with VON/OFF = 0V.
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LTC1385 TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage vs Temperature
5 4
DRIVER OUTPUT VOLTAGE (V)
THRESHOLD VOLTAGE (V)
3 2 1 0 -1 -2 -3 -4 -5 0 10
OUTPUT HIGH VCC = 3.3V
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 LEAKAGE CURRENT (A)
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
SHORT-CIRCUIT CURRENT (mA)
1 DRIVER LOADED RL = 3k
20 30 50 40 TEMPERATURE (C)
LTC1385 * TPC04
Receiver Short-Circuit Current vs Temperature
45 40
SHORT-CIRCUIT CURRENT (mA)
DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k
35 30 25 20 15 10 5 0 0 10 30 50 40 20 TEMPERATURE (C) 60 70 ISC+ ISC-
LTC1385 * TPC06
4
UW
60 70
LTC1385 * 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 30 50 20 TEMPERATURE (C) 60 70
5
0 0 20 40 80 100 60 DATA RATE (kBAUD) 120 140
LTC1385 * TPC02
LTC1385 * TPC03
Driver Leakage in Shutdown vs Temperature
45 40 35 30 25 20 15 10 5 0
60 70 18 16 14 12 10 8 6 4 2 0
Driver Short-Circuit Current vs Temperature
ISC-
VOUT = -20V
ISC+
VOUT = 20V
0
10
30 20 40 50 TEMPERATURE (C)
60
70
0
10
30 50 40 20 TEMPERATURE (C)
60
70
LTC1385 * TPC05
LTC1385 * TPC06
Driver Output Waveforms
Receiver Output Waveform
RECEIVER OUTPUT CL = 51pF
INPUT INPUT
LTC1385 * TPC08 LTC1385 * TPC09
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LTC1385
PI FU CTIO S
VCC: 3.3V 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 Driver Disable pin. The supply current drops to 0.2A and all driver and receiver outputs are forced into three-state. DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With the ON/OFF pin held high, a logic low forces the part into the Driver Disable mode with the charge pump turned off and the driver outputs forced into three-state. Both receivers remain active and the supply current drops to 35A. A logic high forces the part into the Normal mode. V +: Positive Supply Output (EIA/TIA-562 Drivers). V + 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 a large number of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V -: Negative Supply Output (EIA/TIA-562 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 charge pump efficiency, the capacitor's effective series resistance should be less than 2. TR IN: EIA/TIA-562 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 EIA/TIA-562 Voltage Levels. Outputs are in a high impedance state when in the Shutdown or Driver Disable mode 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
1385 F01
Figure 1. Driver Propagation Delay Timing
W
W
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RX INPUT RX OUTPUT t LHR
1.7V
VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V
1385 F02
0V V
-
Figure 2. Receiver Propagation Delay Timing
sn1385 1385fas
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LTC1385
TEST CIRCUITS
Driver Timing Test Load Receiver Timing Test Load
DRIVER INPUT
DRIVER OUTPUT DRIVER 51pF 3k
RX OUTPUT RX INPUT RX 51pF
1385 F04
1385 F03
ESD Test Circuit
2 0.1F 0.1F LOGIC INPUT 4 5 6 VCC 12
S
17 LTC1385 3 7 300k 15 VCC 300k
S
VCC
0.1F 562 OUTPUT
0.1F
LOGIC INPUT LOGIC OUTPUT LOGIC OUTPUT
11 13 10
8 14 5k 9
562 OUTPUT 562 INPUT 562 INPUT
S
RS562 LINE PINS PROTECTED TO 10kV
S
5k ON/OFF 18 1 DRIVER DISABLE
16
1385 F05
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LTC1385
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.
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G Package 20-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
1.25 0.12 6.90 - 7.50* (.272 - .295 ) 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 .100 (2.54) BSC .018 .003 (0.457 0.076)
N18 1002
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LTC1385
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 1 .093 - .104 (2.362 - 2.642) 2 3 4 5 6 7 8 9 .037 - .045 (0.940 - 1.143)
.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 LTC1327 LTC1348 LTC1382 LTC1383 LTC1384 LTC1386 DESCRIPTION 5V, 2 Driver, 2 Receiver RS232 Transceivers 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 200A Supply Current, 0.2A in Shutdown 200A Supply Current, Narrow 16-Pin SO 200A Supply Current, 2 Receivers Active in Shutdown 200A Supply Current, Narrow 16-Pin SO
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
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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 .050 (1.270) BSC .004 - .012 (0.102 - 0.305) .014 - .019 (0.356 - 0.482) TYP
S18 (WIDE) 0502
sn1385 1385fas LW/TP 1002 1K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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