LTC1345
Single Supply
V.35 Transceiver
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
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 I
CC
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
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.
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 re-
ceiver inputs feature
±10kV
ESD protection. The charge
pump features a regulated V
EE
output using three external
1µF capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Modems
Telecommunications
Data Routers
TYPICAL APPLICATIO
1µF
V
CC1
5V
3
1µF
6
LTC1345
1µF
4
2
1
28
Clock and Data Signals for V.35 Interface
1µF
1µF
V
CC2
5V
3
LTC1345
1µF
12
DTE
27
BI
1µF
627T500/1250
1
2
3
4
14
13
12
11
10
9
7
8
GND (102)
8
T
T
RXD (104)
T
T
RXC (115)
T
T
TXC (114)
T
T
SCTE (113)
T
BI
627T500/1250
TXD (103)
T
DCE
28
27
1µF
12
11
10
9
1
2
3
4
5
6
7
18
17
16
15
26
25
24
23
22
21
5
9
V
CC2
10
14
DX
8
DX
7
DX
6
RX
13
RX
1
2
4
26
DX
25
24
7
DX
23
20
11
RX
19
18
12
RX
17
16
13
RX
15
5
9
10
V
CC1
14
U
50Ω
T
=
50Ω
BI TECHNOLOGIES
627T500/1250 (SOIC) OR
899TR50/125 (DIP)
LTC1345 • TA01
U
U
125Ω
1
LINER [ LINEAR TECHNOLOGY ]
