LTC1344CG#TRPBF Linear Technology, LTC1344CG#TRPBF Datasheet

IC CABLE TERM MULTIPROTCL 24SSOP

LTC1344CG#TRPBF

Manufacturer Part Number
LTC1344CG#TRPBF
Description
IC CABLE TERM MULTIPROTCL 24SSOP
Manufacturer
Linear Technology
Type
Cabler
Datasheet

Specifications of LTC1344CG#TRPBF

Number Of Terminations
6
Voltage - Supply
4.75 V ~ 5.25 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
24-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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FEATURES
APPLICATIO S
TYPICAL
Software-Selectable Cable Termination for:
RS232 (V.28)
RS423 (V.10)
RS422 (V.11)
RS485
RS449
EIA530
EIA530-A
V.35
V.36
X.21
Outputs Won’t Load the Line with Power Off
Data Networking
CSU and DSU
Data Routers
R4
CTS
13
R3
5
APPLICATION
DSR
R2
22
U
6
Daisy-Chained Control Outputs
DCD
10
R1
LTC1343
8
D4
DTR
D3
23
U
20
RTS
19
D2
4
RL
D1
21
DB-25 CONNECTOR
1
7
TM
R4
25
RXD
R3
16
3
DESCRIPTIO
The LTC
multiprotocol cable terminators. Each terminator can be
configured as an RS422 (V.11) 100 minimum differen-
tial load, V.35 T-network load or an open circuit for use
with RS232 (V.28) or RS423 (V.10) transceivers that
provide their own termination. When combined with the
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.
RXC
R2
9
, LTC and LT are registered trademarks of Linear Technology Corporation.
17
TXC
12
R1
LTC1343
15
®
1344 features six software-selectable
D4
Software-Selectable
SCTE
D3
11
Cable Terminator
U
24
TXD
D2
14
2
LL
D1
18
1344 TA01
LTC1344
LTC1344
1

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LTC1344CG#TRPBF 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

LTC1344 ABSOLUTE MAXIMUM (Note 1) Positive Supply Voltage (V ) ................................... 7V CC Negative Supply Voltage (V ) ........................... – 13.2V EE Input Voltage (Logic Inputs) .... V EE Input Voltage (Load Inputs) .................................. 18V Operating Temperature ...

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 ...

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