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LTC1350 3.3V Low Power EIA/TIA-562 3-Driver/ 5-Receiver Transceiver
FEATURES

DESCRIPTIO

Low Supply Current: 300A Receivers 4 and 5 Kept Alive in Shutdown: 35A ESD Protection: 10kV Operates from a Single 3.3V Supply Uses Small Capacitors: 0.1F Operates to 120kBaud Three-State Outputs are High Impedance When Off Output Overvoltage Does Not Force Current Back into Supplies EIA/TIA-562 I/O Lines Can Be Forced to 25V Without Damage Flowthrough Architecture
The LTC(R)1350 is a 3-driver/5-receiver EIA/TIA-562 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. In Shutdown mode, two receivers are kept alive and the supply current is only 35A. All RS232 outputs assume a high impedance state in Shutdown or with the power off. The LTC1350 is fully compliant with all data rate and overvoltage EIA/TIA-562 specifications. The transceiver can operate up to 120kbaud with a 1000pF and 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+ VCC C1
+
3-Drivers/5-Receivers with Shutdown
1 2 3 LTC1350 28 27 26 25 24 23 22 21 20 19 18 17 16 15
LTC1350 * TA01
Quiescent and Shutdown Supply Current vs Temperature
600 500
QUIESCENT CURRENT (A)
V- C2 + C2 - DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND NC NC
TEST CONDITION: VCC = 3.3V ALL DRIVER INPUTS TIED TO VCC
4 C1- 5 DR1 OUT 6 RX1 IN 7 DR2 OUT 8 RX2 IN 9 RX3 IN 10 RX4 IN 11 DR3 OUT 12 RX5 IN 13 ON/OFF 14 NC
400 300 200 100 0 -40 -20
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85 75 65 55 45 SHUTDOWN CURRENT 35 0 100
SHUTDOWN CURRENT (A)
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QUIESCENT CURRENT
40 20 60 0 TEMPERATURE (C)
80
LTC1350 * TA02
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LTC1350
ABSOLUTE
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RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW V+ C1+ 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 NW PACKAGE 28-LEAD PDIP VCC 2 3
Supply Voltage (VCC) ................................................ 5V 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 (LTC1350C) ........................ 0C to 70C Industrial (LTC1350I) ........................ - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ORDER PART NUMBER LTC1350CG LTC1350CNW LTC1350CSW LTC1350IG LTC1350INW LTC1350ISW
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 G PACKAGE 28-LEAD SSOP
SW PACKAGE 28-LEAD PLASTIC SO WIDE 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 3k to GND
The denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, unless noted.
MIN Positive Negative

TYP 4.5 - 4.5 1.4 1.4
MAX
UNITS V V V V A A mA A V V V k V V mA A
3.7 - 3.7 2.0
Input Low Level (VOUT = High) Input High Level (VOUT = Low) VIN = VCC VIN = 0V VOUT = 0V Shutdown (Note 3), VOUT = 20V Input Low Threshold Input High Threshold VIN = 10V Output Low, IOUT = - 1.6mA (VCC = 3.3V) Output High, IOUT = 160A (VCC = 3.3V) Sinking Current, VOUT = VCC Shutdown (Note 3), 0V VOUT VCC
0.8 5 -5
9
10 10 1.3 1.7 0.4 5 0.2 3.2 - 20 1
500

0.8 0.1 3 3.0 -3
2.4 1 7 0.4
10
2
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LTC1350
DC ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Generator V + Output Voltage V - Output Voltage Supply Rise Time Power Supply VCC Supply Current CONDITIONS IOUT = 0mA IOUT = 5mA IOUT = 0mA IOUT = - 5mA Shutdown to Turn-On
The denotes specifications which apply over the full operating temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1F, unless noted.
MIN TYP 5.7 5.5 - 5.3 - 5.0 0.2

MAX
UNITS V V V V ms
No Load (All Drivers VIN = VCC)(Note 2) 0C TA 70C No Load (All Drivers VIN = 0)(Note 2) 0C TA 70C No Load (All Drivers VIN = VCC)(Note 2) 0C TA 85C No Load (All Drivers VIN = VCC)(Note 2) - 40C TA 0C No Load (All Drivers VIN = 0)(Note 2) - 40C TA 85C Shutdown (Note 3)
ON/OFF Threshold Low ON/OFF Threshold High
2.0
0.3 0.5 0.3 0.3 0.5 35 1.4 1.4
0.6 1.0 1.0 1.5 1.5 50 0.8
mA mA mA mA mA 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 denotes specifications which apply over the full operating temperature range. VCC = 5V, 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

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: Supply current measurement in Shutdown mode is performed with VON/OFF = 0V.
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LTC1350 TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage vs Temperature
5 4
DRIVER OUTPUT VOLTAGE (V)
3 2 1 0 -1 -2 -3 -4 -5 -40 -20
VCC = 3.3V OUTPUT HIGH
THRESHOLD VOLTAGE (V)
1.8 1.6 1.4 1.2 1.0 -40 -20
SUPPLY CURRENT (mA)
ALL DRIVERS WITH LOAD, RL = 3k
VCC = 3.3V OUTPUT LOW
40 20 0 60 TEMPERATURE (C)
VCC Supply Current vs Temperature
5.0 4.5 4.0 RL = 3k 3 DRIVERS LOADED LEAKAGE CURRENT (A) 45 40 35 30 25 20 15 10 5 40 20 0 60 TEMPERATURE (C) 80 100 0
SHORT-CIRCUIT CURRENT (mA)
SUPPLY CURRENT (mA)
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -20 RL = 3k 1 DRIVER LOADED
Receiver Short-Circuit Current vs Temperature
40 35 30 25 20 15 10 5 0 -40 -20 0 ISC+ ISC-
SHORT-CIRCUIT CURRENT (mA)
40 60 20 TEMPERATURE (C)
4
UW
80
LTC1350 * TPC01
LTC1350 * TPC04
Receiver Input Thresholds vs Temperature
2.2 2.0 30 25 20 15 10 5 0 40 20 60 0 TEMPERATURE (C) 80 100
Supply Current vs Data Rate
VCC = 3.3V RL = 3k CL = 2500pF 3 DRIVERS ACTIVE
VTH+ VTH-
100
0
20
80 100 60 40 DATA RATE (k Baud)
120
140
LT1350 * TPC02
LTC1350 * TPC03
Driver Leakage in Shutdown vs Temperature
16 14 12 10 8 6 4 2
60 70
Driver Short-Circuit Current vs Temperature
ISC-
VOUT = -20V
ISC+
VOUT = 20V
0
10
30 20 40 50 TEMPERATURE (C)
0 -40 -20
0
40 60 20 TEMPERATURE (C)
80
100
LTC1350 * TPC05
LTC1350 * TPC06
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 1000pF DRIVER OUTPUT RL = 3k
Receiver Output Waveform
RECEIVER OUTPUT CL = 50pF
INPUT INPUT
LTC1350 * TPC08 LTC1350 * TPC09
80
100
LTC1350 * TPC07
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LTC1350
PI FU CTIO S
VCC: 3.3V Input Supply Pin. Supply current is typically 35A 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 with receivers 4 and 5 kept alive and the supply current equal to 35A. All driver and other receiver outputs are in high impedance state. This pin cannot float. Positive Supply Output. 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 be paralleled into common capacitors. For a large number of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V -: Negative Supply Output. V - - (2VCC - 1.3V). This pin requires an external capacitor (C = 0.1F) for charge storage. V +: V+ 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 20. DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels. Outputs are in a high impedance state when in the 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. Receiver 1, 2 and 3 outputs are in a high impedance state when in Shutdown mode to allow data line sharing. Receivers 4 and 5 are kept alive in Shutdown.
SWITCHI G TI E WAVEFOR S
DR INPUT DR OUTPUT t LHD VCC 1.4V 1.4V 0V V+ 0V t HLD
LTC1350 * F01
Figure 1. Driver Propagation Delay Timing
RX INPUT RX OUTPUT t LHR
1.7V
Figure 2. Receiver Propagation Delay Timing
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0V
V-
VCC 1.3V 0V 2.4V 0.8V t HLR VCC 0V
LTC1350 * F02
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LTC1350
TEST CIRCUITS
Driver Timing Test Load
DRIVER OUTPUT DRIVER 51pF 3k
Receiver Timing Test Load
RX OUTPUT RX INPUT RX 51pF
DRIVER INPUT
LTC1350 * TA04
LTC1350 * TA03
ESD Test Circuit
V+ C1 0.1F C2 0.1F DR1 OUT RX1 IN RS232 LINE PINS PROTECTED TO 10kV DR2 OUT RX2 IN RX3 IN RX4 IN DR3 OUT RX5 IN ON/OFF NC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1350 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT GND NC NC
LTC1350 * TC01
V- C3 0.1F C4 0.1F
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LTC1350
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
(
+0.889 15.87 -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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LTC1350
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 LT 1137A LTC1327 LTC1337 LTC1348 LTC1385 LTC1386 LTC2844 LTC2845 LTC2846
(R)
DESCRIPTION 5V, 3 Driver, 5 Receiver RS232 Transceiver 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 5V, 3 Driver, 5 Receiver RS232 Transceiver 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 3.3V, Software-Selectable Multiprotocol Transceiver 3.3V, Software-Selectable Multiprotocol Transceiver 3.3V, Software-Selectable Multiprotocol Transceiver
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
COMMENTS 15kV ESD per IEC 1000-4 300A Supply Current, 0.2A in Shutdown 300A Supply Current, 1A in Shutdown True RS232 on 3.3V, 5 Receivers Active in Shutdown 200A Supply Current, 2 Receivers Active in Shutdown 200A Supply Current, Narrow 16-Pin SO 4 Drivers, 4 Receivers for Control Signals Including LL 5 Drivers, 5 Receivers for Control Signals Including LL, RL and TM 4 Drivers, 4 Receivers with Termination for Data/Clock
1350fa LW/TP 0103 1K REV A * PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993

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