LTC1344IG Linear Technology, LTC1344IG Datasheet
LTC1344IG
Specifications of LTC1344IG
Available stocks
Related parts for LTC1344IG
LTC1344IG Summary of contents
Page 1
... LTC1343, the LTC1344 forms a complete software-select- able multiprotocol serial port. A data bus latch feature allows sharing of the select lines between multiple inter- face ports. The LTC1344 is available in a 24-lead SSOP. , LTC and LT are registered trademarks of Linear Technology Corporation. RTS RL TM RXD ...
Page 2
... CM All Logic Input Pins All Logic Input Pins All Logic Input Pins Note 3: All typicals are given TOP VIEW ORDER PART NUMBER LTC1344CG 3 22 DCE/DTE LTC1344IG 4 21 LATCH 5 20 R6B 6 19 R6A 7 18 R5A 8 17 R5B 9 16 R4A 10 15 R4B ...
Page 3
W U TYPICAL PERFORMANCE CHARACTERISTICS V.11 or V.35 Differential Mode Impedance vs Temperature 120 V = –7V CM 115 V = –2V 110 105 100 –40 – ...
Page 4
LTC1344 PIN FUNCTIONS M0 (Pin 1): TTL Level Mode Select Input. The data latched when LATCH is high. V (Pin 2): Negative Supply Voltage Input. Can connect EE directly to the LTC1343 V pin. ...
Page 5
W U ODE SELECTIO LTC1344 MODE NAME DCE/DTE V.10/RS423 X RS530A 0 1 Reserved RS530/RS449/V. V.28/RS232 X No Cable don’t care logic low ...
Page 6
LTC1344 U U APPLICATIONS INFORMATION Multiprotocol Cable Termination One of the most difficult problems facing the designer of a multiprotocol serial interface is how to allow the trans- mitters and receivers for different electrical standards to share connector pins. In ...
Page 7
U U APPLICATIONS INFORMATION BALANCED INTERCONNECTING GENERATOR CABLE TERMINATION ' Figure 6. Typical V.11 Interface A LTC1344 51 OFF 124 51 –10V –3V Z – ...
Page 8
... Z –0.8mA Figure 11. V.35 Receiver Using the LTC1344 low side. However, all of Linear Technology’s V.35 receiv- ers meet the RS485 input impedance specification as shown in Figure 11, which insures compliance with the V.35 specification when used with the LTC1344. The generator differential impedance must be 50 ...
Page 9
U TYPICAL APPLICATIONS Figure 13 shows a typical application for the LTC1344 using the LTC1343 mixed mode transceiver chip to gener- ate the clock and data signals for a serial interface. The LTC1344 V supply is generated from the LTC1343 ...
Page 10
LTC1344 U TYPICAL APPLICATIONS Controller Selectable Multiprotocol DTE Port with DB-25 Connector DTE_LL/DCE_TM 6 DTE_TXD/DCE_RXD 7 DTE_SCT/DEC_RXC DTE_TXC/DCE_TXC ...
Page 11
... SET R2 100k 40 GND 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights 100pF 100pF 100pF ...
Page 12
... Dr/3 Rx for Data and CLK Signals 3 Dr/3 Rx for Data and CLK Signals Allows Separate RS449 Mode 3 Dr/3 Rx for Data and CLK Signals 4 Dr/4 Rx for Control Signals and LL 5 Dr/5 Rx for Control Signals, LL, RL amd TM 1344fa LT/TP 0300 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996 ...