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PDF LTC1384CG Data sheet ( Hoja de datos )
| Número de pieza | LTC1384CG | |
| Descripción | 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Operates from a Single 5V Supply
s Low Supply Current: ICC = 220µA
s ICC = 35µA in Shutdown Mode with Both
Receivers Kept Alive
s ESD Protection Over ±10kV
s Uses Small Capacitors: 0.1µF
s Operates to 120kBaud
s Output Overvoltage Does Not Force Current
Back into Supplies
s RS232 I/O Lines Can Be Forced to ±25V
Without Damage
s Pin Compatible with LT1180A
APPLICATI S
s Notebook Computers
s Palmtop Computers
LTC1384
5V Low Power RS232
Transceiver with 2 Receivers
Active in Shutdown
DESCRIPTIO
The LTC1384 is an ultra-low power 2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1µF capacitors.
The transceiver operates in one of two modes, Normal and
Shutdown. In the Normal mode, ICC is only 220µA with the
driver outputs unloaded. In the Shutdown mode, the
charge pump is turned off, the driver outputs are forced
into three-state, both receivers are kept active and ICC
drops to 35µA. The receiver outputs may be forced into
three-state at any time using the receiver enable (EN) pin.
The LTC1384 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage and can survive multiple ±10kV
ESD strikes.
TYPICAL APPLICATI
2-Drivers/2-Receivers with Shutdown
and Receiver Enable
0.1µF
0.1µF
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
2
4
5 LTC1384
6 VCC
300k
12
VCC
300k
11
13
5k
17 VCC = 5V
3
7
0.1µF
0.1µF
15 232 OUTPUT
8
232 OUTPUT
14
232 INPUT
LOGIC OUTPUT
ON/OFF
10
18
9
232 INPUT
5k
16
1
RX EN
LTC1384 • TA01
Quiescent and Shutdown Supply Current
vs Temperature
1200
TEST CONDITION: VCC = 5V
60
1000
50
800
SHUTDOWN
CURRENT
40
600 30
400
QUIESCENT
20
CURRENT
200 10
0
–20
0 20 40 60
TEMPERATURE (°C)
0
80
LTC1384 • TA02
1
1 page  
LTC1384
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode independent of
the EN pin. The supply current of the device drops to 35µA
(two receivers alive) and both driver outputs are forced
into three-state.
EN: TTL/CMOS Compatible Receiver Enable Pin. A logic
high forces the receiver outputs into three-state. A logic
low enables the receiver outputs.
V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2VCC –
2V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or
VCC. With multiple devices, the V + and V – pins may share
a common capacitor. 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). V – ≅ – (2VCC
– 2V). This pin requires an external capacitor C = 0.1µF for
charge storage.
C1+, C1–, C2+, C2 –: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1– and another from C2+ to C2 –. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2Ω.
TR 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 mode.
TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs
are in a high impedance state when in the Shutdown 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.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. A logic high at EN puts the outputs into three-state.
UW
W
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
1.4V
DRIVER
OUTPUT
t LHD
0V
1.4V
t HLD
VCC
0V
V+
0V
V–
LTC1384 • F01
RX
INPUT
1.7V
RX
OUTPUT
t LHR
0.8V
VCC
1.3V
0V
t HLR
2.4V VCC
0V
LTC1384 • F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1384CG.PDF ] | |
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