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PDF LTC1348IG Data sheet ( Hoja de datos )
| Número de pieza | LTC1348IG | |
| Descripción | 3.3V/5V Low Power RS232 3-Driver/5-Receiver Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1348
3.3V/5V Low Power RS232
3-Driver/5-Receiver Transceiver
FEATURES
s Low Supply Current: 600µA at 3.3V
s Supply Current in Shutdown: 0.2µA
s Supply Current in Receiver Alive Mode: 15µA
s ESD Protection over ±10kV
s Operates from a Single 3V to 5.5V Supply
s Operates to 120kBaud with 0.1µF Flying Capacitors
s Three-State Outputs Are High Impedance When Off
s Output Overvoltage Does Not Force Current
Back into Supplies
s RS232 I/O Lines Can Be Forced to ±25V
Without Damage
s Flowthrough Architecture
APPLICATI S
s Notebook Computers
s Palmtop Computers
s Printers
s Portable Instruments
DESCRIPTIO
The LTC®1348 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. The charge pump only
requires five 0.1µF capacitors. The LTC1348 provides full
RS232 output levels when operated over a wide supply
range of 3V to 5.5V
The transceiver operates in one of four modes: Normal,
Receiver Disable, Receiver Alive and Shutdown. In Normal
or Receiver Disable mode, ICC is only 600µA at 3.3V and
800µA at 5V in the no load condition. In Shutdown mode,
the supply current is further reduced to 0.2µA. In Receiver
Alive mode, all five receivers are kept alive and the supply
current is 15µA. All RS232 outputs assume a high imped-
ance state in Shutdown or Receiver Alive mode or with the
power off. The receiver outputs assume a high impedance
state in Receiver Disable or with the power off.
The LTC1348 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver oper-
ates up to 120kbaud with all drivers loaded with 1000pF,
3kΩ. Both driver outputs and receiver inputs can be forced
to ±25V without damage and can survive multiple ±10kV
ESD strikes.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
3-Drivers/5-Receivers with Shutdown
C5
0.1µF
V+ 1
C2
0.1µF
C1
0.1µF
VCC
DR 1 OUT
RX1 IN
DR 2 OUT
RX2 IN
RX3 IN
RX4 IN
DR 3 OUT
RX5 IN
2
3
4
5
6
7
8
9
10
11
12
13
14
LTC1348
28 V–
27
26
C3
0.1µF
25 DR 1 IN
24
RX1 OUT
23
DR 2 IN
22
RX2 OUT
21 RX3 OUT
20
RX4 OUT
19
DR 3 IN
18 RX5 OUT
17 DREN
16
RXEN
15
GND
LT1348 • TA01
C4
0.1µF
Supply Current
1.6 1.6
1.4
1.2 QUIESCENT
1.0 CURRENT
VCC = 5V
0.8
VCC = 3.3V
0.6
SHUTDOWN
0.4 VCC = 3.3V CURRENT
OR 5V
0.2
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–40 –20
0 20 40 60
TEMPERATURE (˚C)
0
80
LT1348 •TA02
1
1 page  
LTC1348
PI FU CTIO S
VCC: 3V to 5.5V Input Supply Pin. This pin should be
decoupled with a 0.1µF ceramic capacitor.
GND: Ground Pin.
RXEN: TTL/CMOS Compatible Enable Pin. Refer to Table
1 for its functional description.
DREN: TTL/CMOS Compatible Enable Pin. Refer to Table
1 for its functional description.
V+: Positive Supply Output (RS232 Drivers). This pin
requires an external capacitor C = 0.1µF for charge stor-
age. The capacitor may be tied to ground or VCC. With
multiple devices, the V+ and V – pins may be paralleled into
common capacitors. For large numbers of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
V–: Negative Supply Output (RS232 Drivers). This pin
requires an external capacitor C = 0.1µF for charge
storage.
C1+, C1–, C2+, C2–, C3+, C3–: Commutating Capacitor
Inputs. These pins require three external capacitors C =
0.1µF: one from C1+ to C1–, another from C2+ to C2– and
another from C3+ to C3–. To maintain charge pump
efficiency, the capacitor’s effective series resistance should
be less than 1Ω. Ceramic capacitors are recommended.
DR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS
compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip. To minimize power consumption, the
internal driver pull-up resistors are disconnected from VCC
in the Shutdown or Receiver Alive mode.
DR OUT: Driver Outputs at RS232 Voltage Levels. Outputs
are in a high impedance state when in the Shutdown,
Receiver Alive mode or VCC = 0V. The driver outputs are
protected against ESD to ±10kV for human body model
discharges.
RX IN: Receiver Inputs. These pins can be forced to ±25V
without damage. The receiver inputs are protected against
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity. In
Receiver Alive mode all receivers have no hysteresis.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in the
Shutdown or Receiver Disable mode to allow data line
sharing.
Table 1. Functional Description
MODE
RX ENABLE DR ENABLE
Shutdown
0
0
Receiver
Disable
Receiver
Alive
Normal
0
1
1
1
0
1
DRIVERS
All Drivers Shutdown.
All Driver Outputs Assume High Impedance.
All Driver Pull-Up Resistors Disconnect
From VCC.
All Drivers Alive.
All Drivers Shutdown.
All Driver Outputs in Three-State.
All Driver Pull-Up Resistors Disconnect
From VCC.
All Drivers Alive.
RECEIVERS
All Receivers Shutdown.
All Receiver Outputs Assume High Impedance.
ICC TYP
0.2µA
All Receiver Outputs in Three-State.
All Receivers Alive.
600µA at
3.3V,
800µA at
5V
15µA
All Receivers Alive.
600µA at
3.3V,
800µA at
5V
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1348IG.PDF ] | |
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