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LTC1337 5V Low Power RS232 3-Driver/5-Receiver Transceiver
FEATURES

DESCRIPTIO

Low Supply Current: 300A ESD Protection: Over 10kV 1A Supply Current in Shutdown Operates from a Single 5V Supply Uses Small Capacitors: 0.1F Operates to 120k Baud Three-State Outputs Are High Impedance When Off Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to 25V without Damage Pin Compatible with LT (R)1137A and LT1237 Flowthrough Architecture
The LTC(R)1337 is a 3-driver/5-receiver RS232 transceiver with very low supply current. In the no load condition, the supply current is only 300A. The charge pump only requires four 0.1F capacitors and can supply up to 12mA of extra current to power external circuitry. In Shutdown mode, the supply current is further reduced to 1A. All RS232 outputs assume a high impedance state in Shutdown and with the power off. The LTC1337 is fully compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud 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

Notebook Computers Palmtop Computers
TYPICAL APPLICATIO
V+ C1 0.1F C2 0.1F DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1337
3-Drivers/5-Receivers with Shutdown
27 26 25 24 23 22 21 20 19 18 17 16 15
1337 TA01
C3 0.1F DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND
C4 0.1F
QUIESCENT CURRENT OPERATING (A)
28
V-
600 500 400 300 200 100 0 SHUTDOWN CURRENT
-20
TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC
1337 TA02
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Supply Current
1.2 1.0 SHUTDOWN CURRENT (A) 0.8 0.6 0.4 0.2 0 QUIESCENT CURRENT 0 20 40 60 TEMPERATURE (C) 80
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LTC1337
ABSOLUTE
(Note 1)
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RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW V+ 1 28 V- 27 C2+ 26 C2- 25 DR1 IN 24 RX1 OUT 23 DR2 IN 22 RX2 OUT 21 RX3 OUT 20 RX4 OUT 19 DR3 IN 18 RX5 OUT 17 GND 16 NC 15 NC VCC 2 C1+ 3 C1- 4 DR1 OUT 5 RX1 IN 6 DR2 OUT 7 RX2 IN 8 RX3 IN 9 RX4 IN 10 DR3 OUT 11 RX5 IN 12 ON/OFF 13 NC 14
Supply Voltage (VCC) ................................................ 6V Input Voltage Driver ....................................... - 0.3V to V CC + 0.3V Receiver ............................................... - 25V to 25V On/Off Pin .................................. - 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 Commercial (LTC1337C) ........................ 0C to 70C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER LTC1337CG LTC1337CNW LTC1337CSW
G PACKAGE NW PACKAGE 28-LEAD PLASTIC SSOP 28-LEAD PDIP SW PACKAGE 28-LEAD PLASTIC SO TJMAX = 125C, JA = 96C/W (G) TJMAX = 125C, JA = 56C/W (NW) TJMAX = 125C, JA = 85C/W (SW)
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
The denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
MIN Positive Negative

TYP 7.0 - 6.5 1.4 1.4
MAX
UNITS V V V V A A mA A V V V k V V mA mA A
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RL = 3k to GND RL = 3k to GND Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = 5V VIN = 0 VOUT = 0V Shutdown, VOUT = 20V (Note 3) Input Low Threshold Input High Threshold - 10V VIN 10V Output Low, IOUT = - 1.6mA (VCC = 5V) Output High, IOUT = 160A (VCC = 5V) Sourcing Current, VOUT = 0 Sinking Current, VOUT = VCC Shutdown, 0 VOUT VCC (Note 3)
5.0 - 5.0 2.0
0.8 5 -5
10 10 0.8 0.1 3 3.5 15 - 15 1.3 1.7 0.4 5 0.2 4.8 20 - 40 1
500

2.4 1 7 0.4
10
2
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LTC1337
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) On/Off Threshold Low On/Off Threshold High CONDITIONS IOUT = 0mA IOUT = 12mA IOUT = 0mA IOUT = 12mA Shutdown to Turn-On No Load (Note 2) Shutdown (Note 3)
The denotes specifications which apply over the full operating temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1F, unless otherwise noted.
MIN TYP 8.0 7.5 - 8.0 - 6.5 0.2

MAX
UNITS V V V V ms
2.0
0.3 1 1.4 1.4
0.5 10 0.8
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 2

TYP 8 4 2 2 0.3 0.2
MAX 30 3 3 0.6 0.6
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 and driver inputs tied high.
Note 3: Supply current and leakage measurements in Shutdown are performed with VON = 0V.
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
10 8 DRIVER OUTPUT VOLTAGE (V) 6 4 2 0 -2 -4 -6 -8 0 10 VCC = 5V 30 20 40 50 TEMPERATURE (C) 60 70 OUTPUT LOW VCC = 4.5V RL = 3k OUTPUT HIGH VCC = 5V THRESHOLD VOLTAGE (V) VCC = 4.5V 2.0 1.9
1.7 1.6 1.5 1.4 1.3 1.2 1.1 0 10 30 20 40 50 TEMPERATURE (C) 60 70 INPUT LOW
SUPPLY CURRENT (mA)
UW
1337 G01
Receiver Input Thresholds
45 40 INPUT HIGH 35 30 25 20 15 10 5 0 0
Supply Current vs Data Rate
VCC = 5V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE
1.8
25
75 100 125 50 DATA RATE (k BAUD)
150
175
1337 G02
1337 G03
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LTC1337 TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current
20 16 3 DRIVERS LOADED RL = 3k LEAKAGE CURRENT (A) SUPPLY CURRENT (mA) 14 12 10 8 6 4 2 0 0 10 30 20 40 50 TEMPERATURE (C) 60 70 1 DRIVER LOADED RL = 3k 45 40 35 30 25 20 15 10 5 0 0 10 30 20 40 50 TEMPERATURE (C) 60 70 VOUT = 20V VOUT = -20V SHORT-CIRCUIT CURRENT (mA)
Receiver Short-Circuit Current
55 50 SHORT-CIRCUIT CURRENT (mA) 45 40 35 30 25 20 15 10 0 10 30 20 40 50 TEMPERATURE (C) 60 70 ISC+ ISC-
PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current less than 1A in the Shutdown mode. 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 which reduces input supply current to less than 1A and places all drivers and receivers in high impedance state. This pin cannot float. V +: Positive Supply Output (RS232 Drivers). V + 2VCC - 1V. This pin requires an external capacitor C = 0.1F for charge storage. The capacitor may be tied to ground or 5V. With multiple devices, the V + and V - pins may be paralleled into common capacitors. 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 -1.5V). 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 50.
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UW
1337 G04 1337 G07
Driver Leakage in Shutdown
20 18 16 14 12 10 8 6 4 2
Driver Short-Circuit Current
ISC- ISC+
0
10
30 20 40 50 TEMPERATURE (C)
60
70
1337 G05
1337 G06
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 2500pF DRIVER OUTPUT RL = 3k INPUT
Receiver Output Waveforms
RX OUTPUT CL = 50pF
INPUT
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LTC1337
PI FU CTIO S
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DRIVER OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in Shutdown 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 Shutdown mode to allow data line sharing.
SWITCHI G TI E WAVEFOR S
DRIVER INPUT DRIVER OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
1337 F01
Figure 1. Driver Propagation Delay Timing
TEST CIRCUITS
DRIVER OUTPUT DRIVER 51pF 3k
C1 0.1F
1337 F03
DRIVER INPUT
Figure 3. Driver Timing Test Load
RS232 LINE PINS PROTECTED TO 10kV
RX OUTPUT RX IN RX 51pF
1337 F04
Figure 4. Receiver Timing Test Load
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RX IN
1.7V
VCC 1.3V 0V VCC 0.8V 0V t HLR 0V
1337 F02
0V
V-
RX OUTPUT t LHR
Figure 2. Receiver Propagation Delay Timing
ESD Test Circuit
V+ VCC C2 0.1F DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1337 28 27 26 25 24 23 22 21 20 19 18 17 16 15
1337 TC01
V- C3 0.1F DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND C4 0.1F
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LTC1337
TYPICAL APPLICATIO S
Operation Using 5V and 12V Power Supplies
V+ VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1337 28 27 26 25 24 23 22 21 20 19 18 17 16 15
1337 TA03
5V VCC
+
12V V + 0.01F 0.01F
DRIVER OUT RX IN DRIVER OUT RX IN TO LINE RX IN RX IN DRIVER OUT RX IN ON/0FF = 5V
RX OUT DRIVER IN RX OUT RX OUT RX OUT DRIVER IN RX OUT GND TO LOGIC
Typical Mouse Driving Application
V+ MOUSE V+ LOGIC (1) DCD DSR RX RTS OPTICS V- TX CTS DTR (5) (9) RI 0.1F 1 2 C1+ C1- 0.1F DRIVER OUT RX IN DRIVER OUT RX IN RX IN 3 4 5 6 7 8 9 LTC1337 28 27 26 0.1F C2
-
+
25 DRIVER IN 24 RX OUT 23 DRIVER IN 22 RX OUT 21 RX OUT 20 RX OUT 19 DRIVER IN 18 RX OUT 17 GND 16 15
LOGIC "0" LOGIC "0"
MOUSE DATA
RX IN 10 DRIVER OUT 11 RX IN 12 ON/OFF 13 14
LOGIC "1"
DB9
1337 TA04
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+
5V VCC
+
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V- C2 + 0.1F C2 - DRIVER IN
C1+ C1-
0.1F
V- C2 + 0.1F
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LTC1337
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
.600 - .625 (15.240 - 15.875)
.008 - .015 (0.203 - 0.381) +.035 .625 -.015
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
(
15.87
+0.889 -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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G Package 28-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
9.90 - 10.50* (.390 - .413) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1.25 0.12 5.3 - 5.7 7.40 - 8.20 (.291 - .323) 0.65 BSC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 2.0 (.079)
0 - 8
0.65 (.0256) BSC
0.22 - 0.38 (.009 - .015)
0.05 (.002)
G28 SSOP 0802
NW Package 28-Lead PDIP (Wide .600 Inch)
(Reference LTC DWG # 05-08-1520)
1.467* (36.957) MAX 28 27 26 25 24 23 22 21 20 19 18 17 16 15
.505 - .560* (12.827 - 14.224)
1 .150 .005 (3.810 0.127) .015 (0.381) MIN
2
3
4
5
6
7
8
9
10
11
12
13
14
.045 - .065 (1.143 - 1.651)
.070 (1.778) TYP .120 (3.175) MIN .035 - .080 (0.889 - 2.032) .100 (2.54) BSC .018 .003 (0.457 0.076)
NW28 1002
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LTC1337
PACKAGE DESCRIPTIO
.030 .005 TYP N
.050 BSC .045 .005 .697 - .712 (17.70 - 18.08) NOTE 4 28 27 26 25 24 23 22 21 20 19 18 17 16 15
.420 MIN
1
2
3
N/2 N/2
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 3 .016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
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 LT1137A LTC1327 LTC1348 DESCRIPTION 5V, 3 Driver, 5 Receiver RS232 Transceiver 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 3.3V to 5V, 3 Driver, 5 Receiver RS232 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
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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SW Package 28-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
N .325 .005 NOTE 3 .394 - .419 (10.007 - 10.643) 1 .093 - .104 (2.362 - 2.642) 2 3 4 5 6 7 8 9 10 11 12 13 14 .037 - .045 (0.940 - 1.143) .050 (1.270) BSC .014 - .019 (0.356 - 0.482) TYP .004 - .012 (0.102 - 0.305)
S28 (WIDE) 0502
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LINEAR TECHNOLOGY CORPORATION 1993

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