DESCRIPTIO Single Chip Provides Complete Differential Signal Inte
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LTC1346A 10Mbps DCE/DTE V.35 Transceiver
DESCRIPTIO
Single Chip Provides Complete Differential Signal Interface V.35 Port Drivers Receivers Will Withstand Repeated ±10kV Pulses Operates from Supplies 10Mbaud Transmission Rate Meets CCITT V.35 Specification Shutdown Mode Reduces Below Selectable Transmitter Receiver Configurations Independent Driver/Receiver Enables Transmitter Maintains High Impedance When Disabled, Shut Down with Power Transmitters Short-Circuit Protected
LTC1346A single chip transceiver that provides differential clock data signals V.35 interface from supplies. Combined with external resistor termination network ®1134A RS232 transceiver control signals, LTC1346A forms complete power V.35 interface port. LTC1346A features three current output differential transmitters three differential receivers. transceiver configured operation shutdown using three Select pins. Shutdown mode, supply current reduced below 1µA. LTC1346A transceiver operates 10Mbaud. transmitters feature short-circuit protection. Both transmitter outputs receiver outputs forced into high impedance state. transmitter outputs receiver inputs feature ±10kV protection.
registered trademarks Linear Technology Corporation.
APPLICATIO
Modems Telecommunications Data Routers
TYPICAL APPLICATIO
VEE1 0.1mF VCC1 0.1mF LTC1346A
Clock Data Signals V.35 Interface
627T500/1250 (114) (115) (104) (102) SCTE (113) (103) 627T500/1250 VCC2 TECHNOLOGIES 627T500/1250 (SOIC)
LTC1346 TA01
LTC1346A
0.1mF
VCC1
VCC2 VEE2 0.1mF 125W
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LTC1346A ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW
Supply Voltage 6.5V 6.5V Input Voltage Transmitters 0.3V (VCC 0.3V) Receivers 0.3V (VCC 0.3V) Output Voltage Transmitters Receivers 0.3V (VCC 0.3V) Short-Circuit Duration Transmitter Output Indefinite Receiver Output Indefinite Operating Temperature Range LTC1346AC 70°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1346ACSW
PACKAGE 24-LEAD PLASTIC WIDE
TJMAX 150°C, 85°C/W
Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
temperature range. ±5%, (Note
SYMBOL IOSR IOZR PARAMETER Transmitter Differential Output Voltage Transmitter Common Mode Output Voltage Transmitter Output High Current Transmitter Output Current Transmitter Output Leakage Current Transmitter Output Impedance Differential Receiver Input Threshold Voltage Receiver Input Hysterisis Receiver Input Current Receiver Input Impedance Receiver Output High Voltage Receiver Output Voltage Receiver Output Short-Circuit Current Receiver Three-State Output Current Logic Input High Voltage Logic Input Voltage Logic Input Current
denotes specifications which apply over full operating
0.44 12.6 0.55 17.5 0.66 12.6 ±100 UNITS
CONDITIONS (Figure (Figure VB)/2 VB)/2 4mA, 0.2V 4mA, 0.2V VCC,
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LTC1346A
ELECTRICAL CHARACTERISTICS
temperature range. ±5%, (Note
SYMBOL PARAMETER Supply Current
denotes specifications which apply over full operating
Supply Current
tPLH tPHL tSKEW tPLH tPHL tSKEW
Transmitter Rise Fall Time Transmitter Input Output Transmitter Input Output Transmitter Output Output Receiver Input Output Receiver Input Output Differential Receiver Skew, tPLH tPHL Receiver Enable Output (Active Mode) Receiver Enable Output (from Shutdown, Note Receiver Enable Output High (Active Mode) Receiver Enable Output High (from Shutdown, Note Receiver Disable from Receiver Disable from High
CONDITIONS Low, High (Figure Load, Low, High Shutdown, VCC, Low, High (Figure Load, Low, High Shutdown, VCC, (Figures (Figures (Figures (Figures (Figures (Figures (Figures 15pF, Closed (Figures 15pF, Closed (Figures 15pF, Closed (Figures 15pF, Closed (Figures 15pF, Closed (Figures 15pF, Closed (Figures
UNITS
Note Absolute Maximum Ratings those values beyond which life device impaired. Note currents into device pins positive; currents device pins termed negative. voltages referenced device ground unless otherwise specified.
Note Receiver enable output valid high from Shutdown typically 2µs.
TYPICAL PERFOR CHARACTERISTICS
Transmitter Output Current Temperature
25°C
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TIME (ns)
TEMPERATURE (°C)
1346A
Transmitter Output Current Output Voltage
Transmitter Output Skew Temperature
-2.0 -1.5 -1.0 -0.5 OUTPUT VOLTAGE
TEMPERATURE (°C)
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1346A
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LTC1346A TYPICAL PERFOR CHARACTERISTICS
Receiver tPLH tPHL Temperature
LOADED
CURRENT (mA)
CURRENT (mA)
TIME (ns)
TEMPERATURE (°C)
Transmitter Output Waveforms
INPUT 5V/DIV
OUTPUT 0.2V/DIV
FUNCTIONS
(Pin Negative Supply, 4.75V 5.25V (Pin Positive Supply, 4.75V 5.25V (Pin Ground (Pin Transmitter Input, Compatible (Pin Transmitter Input, Compatible (Pin Transmitter Input, Compatible (Pin Select Input Compatible (Pin Select Input Compatible (Pin Receiver Output, Compatible (Pin 10): Receiver Output, Compatible (Pin 11): Receiver Output, Compatible (Pin 12): Select Input Compatible (Pin 13): Receiver Inverting Input (Pin 14): Receiver Noninverting Input (Pin 15): Receiver Inverting Input (Pin 16): Receiver Noninverting Input (Pin 17): Receiver Inverting Input (Pin 18): Receiver Noninverting Input (Pin 19): Transmitter Inverting Output (Pin 20): Transmitter Noninverting Output (Pin 21): Transmitter Inverting Output (Pin 22): Transmitter Noninverting Output (Pin 23): Transmitter Inverting Output (Pin 24): Transmitter Noninverting Output
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Supply Current Temperature
Supply Current Temperature
LOAD -6.0
CURRENT (mA)
-5.0
-5.5
CURRENT (mA)
LOAD
LOADED -6.5
TEMPERATURE (°C)
TEMPERATURE (°C)
-7.0
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Receiver Output Waveforms
INPUT 1V/DIV INPUT 5V/DIV OUTPUT 5V/DIV OUTPUT 5V/DIV
Receiver Enable from Shutdown
INPUT 0.2V/DIV
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LTC1346A
CTIO TABLES
Transmitter Receiver Configuration
Description OFF, Shutdown Mode Mode, Mode Mode,
TEST CIRCUITS
VZ)/2 15pF
Transmitter
INPUTS CONFIGURATION Shutdown OUTPUTS
Receiver
INPUTS CONFIGURATION Shutdown Disabled Disabled -0.2V 0.2V -0.2V 0.2V -0.2V 0.2V OUTPUTS
LTC1346A
Figure V.35 Transmitter/Receiver Test Circuit
RECEIVER OUTPUT
LTC1346A
Figure Receiver Output Enable Disable Timing Test Load
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LTC1346A
SWITCHI WAVEFOR
tSKEW tSKEW
LTC1346A
1.5V
Figure V.35 Transmitter Propagation Delays
-VOD
1MHz: 10ns: 10ns
1.5V OUTPUT
Figure V.35 Receiver Propagation Delays
LTC1346A
1.5V
Figure Receiver Enable Disable Times
1MHz: 10ns: 10ns
1.5V
VDIFF V(Y) V(Z)
INPUT
1.5V
LTC1346A
1MHz: 10ns: 10ns
1.5V
1.5V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 1.5V 0.5V 0.5V
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LTC1346A
APPLICATIONS INFORMATION
Review CCITT Recommendation V.35 Electrical Specifications V.35 CCITT recommendation synchronous data transmission modems. Appendix recommendation describes electrical specifications which summarized below: interface cable balanced twisted pair with impedance. transmitter's source impedance between 150. transmitter's resistance between shorted terminals ground ±15. When terminated resistive load, terminal-to-terminal voltage should 0.55V ±20%. transmitter's rise time should less than signal pulse 40ns, whichever greater. common mode voltage transmitter output should exceed 0.6V. receiver impedance ±10. receiver impedance ground ±15. transmitter receiver should damaged connection earth ground, short-circuiting cross connection other lines. data errors should occur with common mode change either transmitter/receiver ground potential difference between transmitter receiver. Cable Termination Each cable connected LTC1346A must terminated external -resistor network proper operation. Y-termination series connected resistors resistor connected between ground center resistors shown Figure alternative -termination resistor across twisted wires resistors between each wire ground. Standard 1/8W, surface mount resistors used termination network. maintain proper differential output swing, resistor tolerance must better. termination network that combines resistors into SO-14 package available from: Technologies (Formerly Beckman Industrial) Resistor Networks 4200 Bonita Place Fullerton, 92635 http://www.bitechnologies.com Phone: (714) 447-2357 FAX: (714) 447-2500 Part Technologies 627T500/1250 (SOIC) 899-5-500/1250 (DIP)
Figure -Termination Networks
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LTC1346A
LTC1346A
APPLICATIONS INFORMATION
CHIP BOUNDARY 11mA
Figure Simplified Transmitter Schematic
Theory Operation transmitter outputs consist complementary switched-current sources shown Figure With logic zero transmitter input, inverting output sources 11mA noninverting output sinks 11mA. differential transmitter output voltage then termination resistors. With differential resistors each cable, voltage (50)(11mA) 0.55V. With logic transmitter input, output sinks 11mA sources 11mA. common mode voltage when both current sources matched there ground potential difference between cable terminations. transmitter current sources have common mode range ±2V, which allows ground difference between cable terminations ±4V. Each receiver input resistance ground requires external termination meet V.35 input impedance specification. receivers have input hysteresis 50mV improve noise immunity. Three Select pins, configure chip described Function Tables. When transmitters
11mA
LTC1346A
receivers OFF, outputs forced into high impedance. used receiver output enable. Shutdown mode, drops with transmitters receivers OFF. When LTC1346A enabled from Shutdown transmitters receivers require stabilize. Complete V.35 Port Figure shows schematic complete surface mounted, V.35 port using only three capacitors port. LTC1346A used transmit clock data signals LT1134A transmit control signals. test signals 140, used, transmitter inputs should tied VCC. RS422/RS485 Applications receivers LTC1346A used RS422 RS485 applications. Using test circuit Figure LTC1346A receivers able successfully extract data stream from common mode voltage, meeting RS422 RS485 requirements shown Figures
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LTC1346A
APPLICATIONS INFORMATION
VCC1 0.1µF LTC1346A 0.1µF (102) CABLE SHIELD VEE1 627T500/ 1250 (SOIC) 627T500/ 1250 (SOIC)
VCC1 0.2µF 0.2µF
0.1µF
0.1µF 0.1µF
LT1134A
OPTIONAL SIGNALS
2593 2593 34-PIN DTE/DCE 34-PIN DTE/DCE INTERFACE CONNECTOR INTERFACE CONNECTOR
Figure Complete Single V.35 Interface
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VEE2 0.1µF VCC2 0.2µF 0.2µF LTC1346A 0.1µF VCC2
(103)
SCTE (113)
(114)
(115)
(104)
LT1134A
0.1µF
(108)
(105)
(107)
(106)
(109)
(142)
(140)
(141)
LTC1346A TA08
LTC1346A
APPLICATIONS INFORMATION
VCC1 LTC485 1009 1009 LTC1346A
LTC1346A
Figure RS422/RS485 Receiver Interface
RECEIVER OUTPUT 5V/DIV
RECEIVER INPUT 5V/DIV
LTC1346
Figure Common Mode
Multiprotocol Application LTC1346A used multiprotocol applications where V.35, RS232 RS422 (used RS530, RS449 among others) signals appear same port. LTC1346A switched current source driver compatible with RS232 RS422. However, outputs when disabled share lines with RS232 drivers with Shutdown feature such LT1030 RS422 drivers with disable feature such LTC486/LTC487 (Figure 12a).
VCC2
POTENTIAL DIFFERENCE
RECEIVER INPUT 5V/DIV
-10V RECEIVER OUTPUT 5V/DIV
LTC1346
Figure Common Mode
LTC1346A driver will damaged load shared lines when disabled. LTC1346A receiver receive V.35, RS232 RS422 signals shown Figure 12b. LTC1346A receiver directly compatible with V.35 RS422. RS232 signal, noninverting input receiver should grounded. Because line termination each protocols different, some form termination switching should included, either connector shown Figures 12b) PCB.
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LTC1346A
APPLICATIONS INFORMATION
LT1030
LTC487
CONNECTOR
LTC1346A LOGIC INPUT
Figure 12a. Multiprotocol Transmitter
LTC1346A
CONNECTOR
LOGIC OUTPUT
Figure 12b. Multiprotocol Receiver
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
V.35 DIFFERENTIAL CONNECTION WITH TERMINATION
RS422 DIFFERENTIAL CONNECTION
RS232 CONNECTION CONNECTION
1346A F12a
V.35 DIFFERENTIAL CONNECTION WITH TERMINATION
RS422 DIFFERENTIAL CONNECTION WITH TERMINATION
RS232 CONNECTION WITH TERMINATION
1346A F12b
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LTC1346A
PACKAGE DESCRIPTIO
Dimensions inches (millimeters) unless otherwise noted. Package 24-Lead Plastic Small Outline (Wide 0.300)
(LTC 05-08-1620)
.030 ±.005
.050 .045 ±.005 .598 .614 (15.190 15.600) NOTE
.420 .325 ±.005 NOTE .394 .419 (10.007 10.643)
RECOMMENDED SOLDER LAYOUT .291 .299 (7.391 7.595) NOTE .010 .029 (0.254 0.737)
.093 .104 (2.362 2.642)
.037 .045 (0.940 1.143)
.005 (0.127)
.009 .013 (0.229 0.330) NOTE: DIMENSIONS
NOTE .016 .050 (0.406 1.270)
.050 (1.270)
.004 .012 (0.102 0.305)
.014 .019 (0.356 0.482)
(WIDE) 0502
INCHES (MILLIMETERS) DRAWING SCALE IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED .006" (0.15mm)
RELATED PARTS
PART NUMBER LT1134A LTC1334 LTC1344/LTC1344A LTC1544 LTC1545 LTC1546 LTC2844 LTC2845 LTC2846 DESCRIPTION Only, 4-Driver/4-Receiver RS232 Transceiver Only, Configurable RS232/RS485 Transceiver Multiprotocol Cable Terminator 4-Driver, 4-Receiver Multiprotocol Transceiver 5-Driver, 5-Receiver Multiprotocol Transceiver 3-Driver, 3-Receiver Multiprotocol Transceiver with Termination 3.3V, 4-Driver, 4-Receiver Multiprotocol Transceiver 3.3V, 5-Driver, 5-Receiver Multiprotocol Transceiver 3.3V, 3-Driver, 3-Receiver Multiprotocol Transceiver with Termination COMMENTS Forms Complete V.35 Interface with LTC1346A Includes On-Chip Charge Pump Software Selectable, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21 Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21 Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21 Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21 3.3V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21 3.3V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21 3.3V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A, RS449, X.21
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LW/TP 1002 PRINTED
LINEAR TECHNOLOGY CORPORATION 1995
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