DESCRIPTIO June 1995 Single Chip Provides Complete Different

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

DESCRIPTIO June 1995 Single Chip Provides Complete Different

Datasheet Thumbnail

Top Searches for this datasheet

LTC1346 10Mbps DCE/DTE V.35 Transceiver
DESCRIPTIO
June 1995
Single Chip Provides Complete Differential Signal Interface V.35 Port Drivers Receivers Will Withstand Repeated ±10kV Pulses 10MBaud Transmission Rate Meets CCITT V.35 Specification Operates from Supplies Shutdown Mode Reduces Below Selectable Transmitter Receiver Configurations Transmitter Maintains High Impedance When Disabled, Shutdown with Power Transmitters Short-Circuit Protected
LTC1346 single chip transceiver that provides differential clock data signals V.35 interface from supplies. Combined with external resistor termination network LT®1134A RS232 transceiver control signals, LTC1346 forms complete power V.35 interface port. LTC1346 features three current output differential transmitters three differential receivers. transceiver configured operation Shutdown using Select pins. Shutdown mode, supply current reduced below 1µA. LTC1346 transceiver operates 10MBaud. transmitters feature short-circuit protection Receiver Output Enable that allows receiver outputs forced into high impedance state. Both transmitter outputs receiver inputs feature ±10kV protection. single applications that have available, LTC1345 provides same functionality LTC1346 includes on-board generator.
registered trademarks Linear Technology Corporation.
APPLICATI
Modems Telecommunications Data Routers
TYPICAL APPLICATION
Clock Data Signals V.35 Interface
VEE1 0.1µF VCC1 0.1µF LTC1346 (114) (115) (104) (102) SCTE (113) 627T500/1250 (103) 627T500/1250
LTC1346 TA01
LTC1346
0.1µF
VCC1
VCC2
TECHNOLOGIES 627T500/1250 (SOIC)
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.
VCC2
VEE2 0.1µF
LTC1346 ABSOLUTE RATI
PACKAGE/ORDER ATIO
VIEW
(Note 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 Commercial 70°C Industrial 40°C 85°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1346CSW LTC1346ISW
PACKAGE 24-LEAD PLASTIC WIDE
THREE V.35 TRANSMITTERS THREE RECEIVERS TJMAX 150°C, 85°C/W
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
±5%, (Note
CONDITIONS (Figure (Figure VB)/2 VB)/2 4mA, 0.2V 4mA, 0.2V VCC, HIGH (Figure Load, HIGH Shutdown, HIGH (Figure Load, HIGH Shutdown,
0.44 12.6
0.55
0.66 12.6 ±100
17.5
Supply Current
UNITS
LTC1346
ELECTRICAL CHARACTERISTICS
SYMBOL tPLH tPHL tSKEW tPLH tPHL tSKEW 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 Maximum Data Rate (Note
±5%, (Note
CONDITIONS (Figures (Figures (Figures (Figures (Figures (Figures (Figures 15pF, Closed (Figures 15pF, Closed (Figures 15pF, Closed (Figures 15pF, Closed (Figures
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 Maximum data rate specified data encoding scheme. maximum data rate different other data encoding schemes. Data rate guaranteed propagation delay test.
FUNCTIONS
(Pin Negative Supply, -4.75V -5.25V. (Pin Positive Supply, 4.75V 5.25V. (Pin Ground. (Pin Transmitter Input. (Pin Transmitter Input. (Pin Transmitter Input. (Pin Select Input (Pin Select Input (Pin Receiver Output. (Pin 10): Receiver Output. (Pin 11): Receiver Output. (Pin 12): Receiver Output Enable. ensure shutdown mode, both should should HIGH. (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.
LTC1346
CTIO TABLES
Transmitter Receiver Configuration
REMARKS Shut Down* Mode, Shut Down Mode, Shut Down Active Disabled INPUTS CONFIGURATION Shutdown* OUTPUTS Shutdown*
Transmitter
TEST CIRCUITS
VZ)/2 15pF
Figure V.35 Transmitter/Receiver Test Circuit
SWITCHI WAVEFOR
tSKEW tSKEW
LTC1346
1.5V
1MHz: 10ns: 10ns
Figure V.35 Transmitter Propagation Delays
Receiver
INPUTS CONFIGURATION 0.2V 0.2V 0.2V 0.2V OUTPUTS
ensure shutdown mode, both should should HIGH
RECEIVER OUTPUT
LTC1346
LTC1346
Figure Receiver Output Enable Disable Timing Test Load
1.5V
VDIFF V(Y) V(Z)
LTC1346
SWITCHI WAVEFOR
-VOD2
LTC1346
1MHz: 10ns: 10ns
Figure V.35 Receiver Propagation Delays
LTC1346
1.5V
Figure Receiver Enable Disable Times
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 commonmode change either transmitter receiver, ground potential difference between transmitter receiver. Cable Termination Each cable connected LTC1346 must terminated external resistor network proper operation. Y-termination series connected resistors resistor connected between ground center resistors shown Figure
INPUT
1.5V
OUTPUT
1.5V
1MHz: 10ns: 10ns
1.5V
1.5V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 1.5V 0.5V 0.5V
LTC1346
APPLICATIONS INFORMATION
CHIP BOUNDARY 11mA
LTC1346
Figure Termination Networks
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 less. termination network that combines resistors into 14-pin 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 (SO) 899TR50/125 (DIP) Theory Operation transmitter output consists 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 11mA) 0.55V. With logic transmitter input, output sinks 11mA sources 11mA. common-mode voltage when both current sources matched there ground potential
11mA
LTC1346
Figure Simplified Transmitter Schematic
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. Select pins, configure chip DTE, DCE, transmitter receivers Shutdown. ensure shutdown mode, both should should HIGH. Shutdown mode, drops 1µA. outputs transmitters receivers high impedance states. Complete V.35 Port Figure shows schematic complete surface mounted, single V.35 port using only three capacitors port. LTC1346 used transmit clock data signals, LT1134A transmit control signals. test signals 140, 141, used, transmitter inputs should tied VCC.
LTC1346
APPLICATIONS INFORMATION
VCC1 VEE1 627T500/ 1250 (SOIC) 627T500/ 1250 (SOIC)
0.1µF
(103)
SCTE (113)
(114)
(115)
(104)
(102) CABLE SHIELD
VCC1
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 V.35 Interface
LTC1346
0.1µF
VEE2 0.1µF VCC2 LTC1346 VCC2
0.1µF
LT1134A
LTC1346 TA08
LTC1346
APPLICATIONS INFORMATION
RS422/RS485 Applications receivers LTC1346 ideal RS422 RS485 applications. Using test circuit Figure LTC1346 receivers able successfully reconstruct data stream with common-mode voltage meeting RS422 RS485 requirements (12V -7V). Figures show that LTC1346 receivers very capable reconstructing data frequencies 10MHz.
VCC1 LTC485 LTC1346
LTC1346
VCC2 RECEIVER INPUT 5V/DIV
COMMON-MODE VOLTAGE
Figure RS422/RS485 Receiver Interface
RECEIVER OUTPUT 5V/DIV
RELATED PARTS
PART NUMBER LTC1345 DESCRIPTION Single Supply V.35 Transceiver COMMENTS Requires Only Single Power
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
RECEIVER OUTPUT 5V/DIV
RECEIVER INPUT 5V/DIV -10V
LTC1346
Figure Common Mode
LTC1346
Figure Common Mode
LT/GP 0695 PRINTED
LINEAR TECHNOLOGY CORPORATION 1995

DESCRIPTIO June 1995 Single Chip Provides Complete Different

Top Searches for this datasheet

Other recent searches