LTC1344A Linear Technology, LTC1344A Datasheet - Page 12

• Manufacturer Part Number: LTC1344A
• Description: Software-Selectable Cable Terminator
• Manufacturer: Linear Technology

LTC1344A
TYPICAL APPLICATIO
Figure 13 shows a typical application for the LTC1344A
using the LTC1543 mixed mode transceiver chip to gener-
ate the clock and data signals for a serial interface. The
LTC1344A V
charge pump and the select lines M0, M1, M2 and
RELATED PARTS
PART NUMBER
LTC1334
LTC1343
LTC1345
LTC1346A
LTC1543
LTC1544
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
EE
supply is generated from the LTC1543
DESCRIPTION
Single Supply RS232/RS485 Transceiver
Multiprotocol Serial Transceiver
Single Supply V.35 Transceiver
Dual Supply V.35 Transceiver
Multiprotocol Serial Transceiver
Multiprotocol Serial Transceiver
DCE/DTE
M0
M1
M2
24
23
22
21
C1
1 F
1
11
12
13
14
10
5
6
7
8
9
M0
M1
M2
DCE/DTE
LATCH
U
M0
M1
M2
DCE/DTE
V
CC
LTC1543
4
14
Figure 13. Typical Application Using the LTC1344A
V
EE
26
2
LTC1344A
24
23
22
21
20
19
18
17
16
15
C2
3.3 F
5
3
100pF
4
COMMENTS
2 RS485 Dr/Rx or 4 RS232 Dr/Rx Pairs
Software Selectable Mulitprotocol Interface
3 Dr/3 Rx for Data and CLK Signals
3 Dr/3 Rx for Data and CLK Signals
Software-Selectable Transceiver for Data and CLK Signals
Software-Selectable Transceiver for Control Signals
6
8
100pF
DCE/DTE are shared by both chips. Each driver output and
receiver input is connected to one of the LTC1344A
termination ports. Each electrical protocol can then be
chosen using the digital select lines.
7
9
11
100pF
10
12
16
15
13
18
17
19
1344af, sn1344a LT/TP 0898 4K • PRINTED IN USA
20
LINEAR TECHNOLOGY CORPORATION 1998
DTE
TXD
TXD
SCTE
SCTE
TXC
TXC
RXC
RXC
RXD
RXD
+
–
+
–
+
–
+
–
+
–
DCE
RXD
RXD
RXC
RXC
TXC
TXC
SCTE
SCTE
TXD
TXD
+
+
–
+
–
+
–
1344 F13
–
+
–