LTC1344ACG Linear Technology, LTC1344ACG Datasheet

IC CABLE TERM MULTIPROTCL 24SSOP

LTC1344ACG

Manufacturer Part Number
LTC1344ACG
Description
IC CABLE TERM MULTIPROTCL 24SSOP
Manufacturer
Linear Technology
Type
Cabler
Datasheet

Specifications of LTC1344ACG

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
Contains lead / RoHS non-compliant

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APPLICATIONS
FEATURES
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
D4
R4
LL
18
APPLICATION
CTS
R3
13
U
5
Daisy-Chained Control Outputs
DSR
10
R2
8
R1
LTC1544
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DCD
U
D3
22
6
DTR
D2
23
20
RTS
19
D1
DB-25 CONNECTOR
4
1
7
RXD
16
R3
3
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
LTC1543 and LTC1544, the LTC1344A forms a complete
software-selectable multiprotocol serial port. A data bus
latch feature allows sharing of the select lines between
multiple interface ports.
The LTC1344A is similar to the LTC1344 except for a
difference in the Mode Selection table.
The LTC1344A is available in a 24-lead SSOP.
DESCRIPTION
RXC
R2
9
, LTC and LT are registered trademarks of Linear Technology Corporation.
17
R1
LTC1543
®
1344A features six software-selectable
Software-Selectable
TXC
12
D3
15
SCTE
D2
11
Cable Terminator
U
24
TXD
D1
14
2
1344A TA01
LTC1344A
LTC1344A
1

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LTC1344ACG Summary of contents

Page 1

... The LTC1344A is similar to the LTC1344 except for a difference in the Mode Selection table. The LTC1344A is available in a 24-lead SSOP. , LTC and LT are registered trademarks of Linear Technology Corporation. DTR RTS RXD RXC ...

Page 2

... Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are reference to ground unless otherwise specified. Note 3: All typicals are given TOP VIEW ORDER PART NUMBER LTC1344ACG 3 22 DCE/DTE LTC1344AIG 4 21 LATCH 5 20 R6B 6 19 R6A 7 ...

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

LTC1344A 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 LTC1543 V pin. ...

Page 5

W U ODE SELECTIO LTC1344A MODE NAME DCE/DTE V.10/RS423 X RS530A 0 1 RS530 RS449/V. V.28/RS232 X No Cable don’t care logic low ...

Page 6

LTC1344A 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 LTC1344A 51 OFF 124 51 –10V –3V Z – ...

Page 8

... Figure 11. V.35 Receiver Using the LTC1344A if the receiver input impedance is on the low side. All of Linear Technology’s V.35 receivers meet the RS485 input impedance specification as shown in Figure 11, which insures compliance with the V.35 specification when used with the LTC1344A. ...

Page 9

U TYPICAL APPLICATIONS Controller Selectable Multiprotocol DTE/DCE Port with DB-25 Connector DTE_LL/DCE_TM DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC DTE_TXC/DCE_TXC 14 DTE_RXC/DCE_SCTE 15 DTE_RXD/DCE_TXD 16 DTE_TM/DCE_LL ...

Page 10

LTC1344A U TYPICAL APPLICATIONS Cable Selectable Multiprotocol DTE/DCE Port with DB-25 Connector DTE_TXD/DCE_RXD 6 DTE_SCTE/DCE_RXC 7 8 DTE_TXC/DCE_TXC 9 DTE_RXC/DCE_SCTE 10 DTE_RXD/DCE_TXD 11 ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

Page 12

... TXD RXD + + SCTE RXC – – SCTE RXC + + TXC TXC – – TXC TXC + + RXC SCTE – – RXC SCTE + + RXD TXD – – RXD TXD 1344 F13 1344af, sn1344a LT/TP 0898 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 ...

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