DESCRIPTIO Single Chip Provides V.35 Differential Clock Data Sign

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DESCRIPTIO Single Chip Provides V.35 Differential Clock Data Sign

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LTC1345 Single Supply V.35 Transceiver
DESCRIPTIO
Single Chip Provides V.35 Differential Clock Data Signals Operates From Single Supply Shutdown Mode Reduces Software Selectable Configuration Transmitters Receivers Will Withstand Repeated ±10kV Pulses 10MBaud Transmission Rate Transmitter Maintains High Impedance When Disabled, Shut Down, with Power Meets CCITT V.35 Specification Transmitters Short-Circuit Protected
LTC1345 single chip transceiver that provides differential clock data signals V.35 interface from single supply. Combined with external resistor termination network ®1134A RS232 transceiver control signals, LTC1345 forms complete power V.35 interface port operating from single supply. LTC1345 features three current output differential transmitters, three differential receivers, charge pump. transceiver configured operation shut down using Select pins. Shutdown mode, supply current reduced 1µA. transceiver operates 10Mbaud. transmitters feature short-circuit protection Receiver Output Enable allows receiver outputs forced into high impedance state. Both transmitter outputs receiver inputs feature ±10kV protection. charge pump features regulated output using three external capacitors.
registered trademarks Linear Technology Corporation.
APPLICATI
Modems Telecommunications Data Routers
TYPICAL APPLICATION
Clock Data Signals V.35 Interface
VCC1
(103) SCTE (113) (114) (115) (104) (102) 627T500/1250 627T500/1250
VCC2
VCC1
LTC1345
VCC2
LTC1345
TECHNOLOGIES 627T500/1250 (SOIC) 899TR50/125 (DIP)
LTC1345 TA01
LTC1345 ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW PACKAGE 28-LEAD PDIP WIDE PACKAGE 28-LEAD PLASTIC WIDE
Supply Voltage, Input Voltage Transmitters 0.3V (VCC 0.3V) Receivers 0.3V (VCC 0.3V) Output Voltage Transmitters Receivers 0.3V (VCC 0.3V) 0.3V Short-Circuit Duration Transmitter Output Indefinite Receiver Output Indefinite Operating Temperature Range Commercial 70°C Industrial 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1345CNW LTC1345CSW LTC1345INW LTC1345ISW
THREE V.35 TRANSMITTERS THREE RECEIVERS TJMAX 125°C, 56°C/W (NW) TJMAX 125°C, 85°C/W (SW)
Consult factory Military grade parts.
ELECTRICAL CHARACTERISTICS
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 Supply Current
(Notes unless otherwise specified.
Voltage
CONDITIONS Figure Figure VB)/2 VB)/2 4mA, 0.2V 4mA, 0.2V Figure HIGH Load, HIGH Shutdown, Load, HIGH
0.44 12.6
0.55
0.66 12.6 ±100
17.5
UNITS
LTC1345
ELECTRICAL CHARACTERISTICS
SYMBOL tPLH tPHL tSKEW tPLH tPHL tSKEW fOSC BRMAX PARAMETER 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 Receiver Enable Output HIGH Receiver Disable From Receiver Disable From HIGH Charge Pump Oscillator Frequency Maximum Data Rate (Note
(Notes unless otherwise specified.
CONDITIONS Figures Figures Figures Figures Figures Figures Figures Figures 15pF, Closed Figures 15pF, Closed Figures 15pF, Closed Figures 15pF, Closed
UNITS Mbaud
denotes specifications which apply over full operating temperature range. Note absolute maximum ratings those values beyond which safety device cannot guaranteed. Note currents into device pins termed positive; currents device pins termed negative. voltages referenced device ground unless otherwise specified.
Note typicals given ceramic capacitors 25°C. Note Maximum data rate specified data encoding scheme. maximum data rate different other data encoding schemes. Data rate guaranteed correlation tested.
TYPICAL PERFORMANCE CHARACTERISTICS
Transmitter Output Current Temperature
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TIME (ns)
TEMPERATURE (°C)
LTC1345 TPC01
Transmitter Output Current Output Voltage
25°C
Transmitter Output Skew Temperature
-2.0 -1.5 -1.0 -0.5 OUTPUT VOLTAGE
TEMPERATURE (°C)
LTC1345 TPC02
LTC1345 TPC03
LTC1345
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver tPLH tPHL Temperature
CURRENT (mA) LOADED CURRENT (mA) -5.0
LOAD
VOLTAGE
TIME (ns)
TEMPERATURE (°C)
Transmitter Output Waveforms
INPUT 5V/DIV
OUTPUT 0.2V/DIV
FUNCTIONS
(Pin Capacitor Positive Terminal. (Pin Capacitor Positive Terminal. (Pin Positive Supply, 4.75 5.25V. (Pin Capacitor Negative Terminal. (Pin Ground. positive terminal connected ground. (Pin Transmitter Input. (Pin Transmitter Input. (Pin Transmitter Input. (Pin Select Input (Pin 10): Select Input (Pin 11): Receiver Output. (Pin 12): Receiver Output. (Pin 13): Receiver Output. (Pin 14): Receiver Output Enable. (Pin 15): Receiver Inverting Input. (Pin 16): Receiver Noninverting Input. (Pin 17): Receiver Inverting Input. (Pin 18): Receiver Noninverting Input. (Pin 19): Receiver Inverting Input. (Pin 20): Receiver Noninverting Input. (Pin 21): Transmitter Inverting Output.
LTC1345 TPC04
Supply Current Temperature
-4.5
Voltage Temperature
-5.5
-6.0
TEMPERATURE (°C)
-6.5
TEMPERATURE (°C)
LTC1345 TPC05
LTC1345 TPC06
Receiver Output Waveforms
INPUT 0.2/DIV
OUTPUT 5V/DIV
LTC1345 TPC07
LTC1345 TPC08
LTC1345
FUNCTIONS
(Pin 22): Transmitter Noninverting Output. (Pin 23): Transmitter Inverting Output. (Pin 24): Transmitter Noninverting Output (Pin 25): Transmitter Inverting Output. (Pin 26): Transmitter Noninverting Output. (Pin 27): Charge Pump Output. Connected negative terminal capacitor (Pin 28): Capacitor Negative Terminal.
CTIO TABLES
Transmitter Receiver Configuration
REMARKS Shutdown Mode, Shut Down Mode, Shut Down Active Disabled INPUTS CONFIGURATION Shutdown OUTPUTS Shutdown
Transmitter
TEST CIRCUITS
VZ)/2 15pF RECEIVER OUTPUT
Figure V.35 Transmitter/Receiver Test Circuit
Receiver
INPUTS CONFIGURATION 0.2V 0.2V 0.2V 0.2V OUTPUTS
LTC1345
LTC1345
Figure Receiver Output Enable/Disable Timing Test Load
LTC1345
SWITCHI WAVEFOR
tSKEW tSKEW
LTC1345
1.5V
1MHz: 10ns: 10ns
Figure V.35 Transmitter Propagation Delays
-VID
1MHz: 10ns: 10ns
1.5V OUTPUT
Figure V.35 Receiver Propagation Delays
LTC1345
1.5V
Figure Receiver Enable Disable Times
1.5V 1.5V
1.5V
VDIFF V(Y) V(Z)
INPUT
1.5V
LTC1345
1MHz: 10ns: 10ns
1.5V
OUTPUT NORMALLY OUTPUT NORMALLY HIGH
0.5V
0.5V
LTC1345
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, terminalto-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 LTC1345 must terminated either electrically equivalent external resistor networks proper operation. Y-termination series connected resistors resistor connected between ground center resistors shown Figure
LTC1345
Figure Termination Networks
alternative -termination resistor across twisted wires resistors between each wire ground shown Figure Standard 1/8W, surface mount resistors used termination network. maintain proper differential output swing, resistor tolerance must less. termination network that combines resistors into SO-14 package available from: Technologies (Formerly Beckman Industrial) Resistor Networks 4200 Bonita Place Fullerton, 92635 Phone: (714) 447-2357 FAX: (714) 447-2500 Part Technologies 627T500/1250 (SOIC) 899TR50/125 (DIP)
LTC1345
APPLICATIONS INFORMATION
Theory Operation transmitter output consists complementary switched-current sources shown Figure
CHIP BOUNDARY 11mA
11mA
LTC1345
Figure Simplified Transmitter Schematic
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 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. receiver output
forced into high impedance state pulling output enable (OE) high. normal operation should pulled low. charge pump generates regulated negative supply voltage (VEE) with three capacitors. Commutating capacitors form voltage doubler inverter while acts reservoir capacitor. insure proper operation, capacitors must have less than Monolithic ceramic solid tantalum capacitors good choices. Under light loads, regulation about 5.2V provided pulse-skipping scheme. Under heavy loads charge pump continuously. small ripple about 500mV will present VEE. Select pins, configure chip DTE, DCE, transmitters receivers Shutdown. Shutdown mode, drops 1µA. outputs transmitters receivers high impedance states, charge pump stops clamped ground. Protection LTC1345 transmitter outputs receiver inputs have onchip protection from multiple ±10kV transients. testing done using Human Body Model. testing must done with ground supply pins. supply decoupling reservoir capacitors provide this ground during normal operation. Complete V.35 Port Figure shows schematic complete surface mounted, single V.35 port using only three eight capacitors port. LTC1345 used transmit clock data signals, LT1134A transmit control signals. test signals 140, 141, used, transmitter inputs should tied VCC.
LTC1345
APPLICATIONS INFORMATION
VCC1
627T500/ 1250 (SOIC)
VCC1 0.2µF 0.2µF
(103)
SCTE (113)
(114)
(115)
(104)
(102) CABLE SHIELD
0.1µF
0.1µF 0.1µF
LT1134A
(108)
(105)
(107)
(106)
(109)
OPTIONAL SIGNALS
(142)
(140)
(141)
2593 2593 34-PIN DTE/DCE 34-PIN DTE/DCE INTERFACE CONNECTOR INTERFACE CONNECTOR
Figure Complete Single V.35 Interface
LTC1345
VCC2
627T500/ 1250 (SOIC)
LTC1345
VCC2 0.2µF
0.2µF
LT1134A
0.1µF
LTC1345 TA08
LTC1345
APPLICATIONS INFORMATION
RS422/RS485 Applications receivers LTC1345 ideal RS422 RS485 applications. Using test circuit Figure LTC1345 receivers able successfully reconstruct data stream with common-mode voltage meeting RS422 RS485 requirements (12V -7V). Figures show that LTC1345 receivers very capable reconstructing data rates 10Mbaud.
VCC1 LTC485 LTC1345 VCC2 RECEIVER OUTPUT 5V/DIV
COMMON-MODE VOLTAGE
LTC1345
Figure RS422/RS485 Receiver Interface
RECEIVER INPUT 5V/DIV -10V
LTC1345
Figure Common Mode
RECEIVER INPUT 5V/DIV
RECEIVER OUTPUT 5V/DIV
LTC1345
Figure Common Mode
LTC1345
PACKAGE DESCRIPTION
Dimensions inches (millimeters) unless otherwise noted. Package 28-Lead Plastic
1.455* (36.957)
0.505 0.560* (12.827 14.224)
0.600 0.625 (15.240 15.875)
0.150 0.005 (3.810 0.127) 0.015 (0.381)
0.045 0.065 (1.143 1.651)
0.009 0.015 (0.229 0.381) +0.025 0.625 -0.015 +0.635 -0.381
0.070 (1.778) 0.125 (3.175) 0.035 0.080 (0.889 2.032) 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076)
0594
15.87
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTURSIONS SHALL EXCEED 0.010 INCH (0.254mm).
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.
LTC1345
PACKAGE DESCRIPTION
Dimensions inches (millimeters) unless otherwise noted. Package 28-Lead Plastic
0.697 0.712 (17.70 18.08) (NOTE
NOTE
0.394 0.419 (10.007 10.643)
0.291 0.299 (7.391 7.595) (NOTE 0.010 0.029 (0.254 0.737)
0.005 (0.127)
0.093 0.104 (2.362 2.642)
0.037 0.045 (0.940 1.143)
0.009 0.013 (0.229 0.330)
NOTE 0.016 0.050 (0.406 1.270)
0.050 (1.270)
0.014 0.019 (0.356 0.482)
0.004 0.012 (0.102 0.305)
NOTE: IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS. PART SUPPLIED WITH WITHOUT OPTIONS. THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.006 INCH (0.15mm).
SOL28 0392
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LT/GP 0395 PRINTED
LINEAR TECHNOLOGY CORPORATION 1995

DESCRIPTIO Single Chip Provides V.35 Differential Clock Data Sign

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