LTC1345
Single Supply
V.35 Transceiver
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FEATURES
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DESCRIPTIO
Single Chip Provides All V.35 Differential Clock
and Data Signals
Operates From Single 5V Supply
Software Selectable DTE or DCE Configuration
Transmitters and Receivers Will Withstand
Repeated ±10kV ESD Pulses
Shutdown Mode Reduces ICC to 1µA Typ
10MBaud Transmission Rate
Transmitter Maintains High Impedance When
Disabled, Shut Down, or with Power Off
Meets CCITT V.35 Specification
Transmitters are Short-Circuit Protected
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The LTC1345 features three current output differential
transmitters, three differential receivers, and a charge
pump. The transceiver can be configured for DTE or DCE
operation or shut down using two Select pins. In the
Shutdown mode, the supply current is reduced to 1µA.
The transceiver operates up to 10Mbaud. All transmitters
feature short-circuit protection and a Receiver Output
Enable pin allows the receiver outputs to be forced into a
high impedance state. Both transmitter outputs and receiver inputs feature ±10kV ESD protection. The charge
pump features a regulated VEE output using three external
1µF capacitors.
APPLICATIO S
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The LTC®1345 is a single chip transceiver that provides the
differential clock and data signals for a V.35 interface from
a single 5V supply. Combined with an external resistor
termination network and an LT ®1134A RS232 transceiver
for the control signals, the LTC1345 forms a complete low
power DTE or DCE V.35 interface port operating from a
single 5V supply.
Modems
Telecommunications
Data Routers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Clock and Data Signals for V.35 Interface
1µF
1µF
1µF
DTE
VCC1
5V
2
4
1
28
3
1µF
27
24
23
RX
13
RX
12
11
16
12
13
17
RX
14
18
11
4
19
DX
10
10
VCC1
15
14
9
5
9
TXD (103)
3
20
7
2
BI
627T500/1250
BI
627T500/1250
1
25
DX
2
T
12
1
T
T
RXD (104)
T
T
23
5
T
24
4
RXC (115)
25
3
T
26
2
TXC (114)
15
22
6
8
GND (102)
8
12
RX
13
RX
6
DX
7
DX
50Ω
8
DX
21
7
7
1µF
16
9
T
17
10
SCTE (113)
3
LTC1345
18
11
T
T
1µF
VCC2
5V
4
27
1µF
26
6
1
28
LTC1345
1µF
DCE
T
5
125Ω
=
50Ω
9
VCC2
10
14
BI TECHNOLOGIES
627T500/1250 (SOIC) OR
899TR50/125 (DIP)
LTC1345 • TA01
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