LTC1345 Datasheet, PDF (1/12 Pages) Linear Technology – Single Supply V.35 Transceiver

FEATURES
s _{Single Chip Provides All V.35 Differential Clock}
and Data Signals
s _{Operates From Single 5V Supply}
s _{Software Selectable DTE or DCE Configuration}
s _{Transmitters and Receivers Will Withstand}
Repeated ±10kV ESD Pulses
s _{Shutdown Mode Reduces ICC to 1µA Typ}
s _{10MBaud Transmission Rate}
s _{Transmitter Maintains High Impedance When}
Disabled, Shut Down, or with Power Off
s _{Meets CCITT V.35 Specification}
s _{Transmitters are Short-Circuit Protected}
U
APPLICATIO S
s _Modems
s _{Telecommunications}
s _{Data Routers}
LTC1345
Single Supply
V.35 Transceiver
DESCRIPTIO
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.
TYPICAL APPLICATIO
1µF
1µF
Clock and Data Signals for V.35 Interface
1µF
1µF
V_CC1
5V
3
1µF
6
4 21
LTC1345
DX
DTE
28
27
1µF
BI
627T500/1250
26
1
25
2
T
TXD (103)
DCE
27
BI
627T500/1250
1µF
12
18
T
11
17
28 1 2
LTC1345
RX
4
3
12
V_CC2
5V
1µF
7
DX
24
3
23
4
T
SCTE (113)
10
16
13
T
9
15
RX
20
14
11
RX
19
13
T
TXC (114)
1
26
T
2
25
6
DX
18
12
12
RX
17
11
T
RXC (115)
3
24
T
4
23
7
DX
16
10
13
RX
15
9
T
5
7
RXD (104)
5
22
T
6
21
7
5
8
DX
50Ω _125Ω
T=
50Ω
9 10 14
V_CC1
8
GND (102)
8
9
V_CC2
10 14
BI TECHNOLOGIES
627T500/1250 (SOIC) OR
899TR50/125 (DIP)
LTC1345 • TA01
1