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PDF LTC1349I Data sheet ( Hoja de datos )
| Número de pieza | LTC1349I | |
| Descripción | 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in SHUTDOWN | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1349
5V Low Power RS232
3-Driver/5-Receiver Transceiver
with 2 Receivers Active
in SHUTDOWN
FEATURES
s Low Supply Current: 300µA
s Two Receivers Kept Alive in SHUTDOWN
s ESD Protection Over ±10kV
s Operates from a Single 5V Supply
s Uses Small Capacitors: 0.1µF
s Operates to 120k Baud
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 Pin Compatible with LT1137A and LT1237
s Flowthrough Architecture
APPLICATI S
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LTC1349 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. In the no load condition, the
supply current is only 300µA. The charge pump only
requires four 0.1µF capacitors.
In SHUTDOWN mode, two receivers are kept alive and the
supply current is 35µA. All RS232 outputs assume a high
impedance state in SHUTDOWN and with the power off.
The LTC1349 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud 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
C1
0.1µF
3-Drivers/5-Receivers with SHUTDOWN
V+ 1
VCC
C2
0.1µF
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
NC
2
3
4
5
6
7
8
9
10
11
12
13
14
LTC1349
28 V–
27
26
C3
0.1µF
25
DRIVER 1 IN
24
RX1 OUT
23
DRIVER 2 IN
22
RX2 OUT
21
RX3 OUT
20
RX4 OUT
19
DRIVER 3 IN
18
RX5 OUT
17
GND
16
NC
15
NC
C4
0.1µF
LTC1349 • TA01
Quiescent and SHUTDOWN Supply Current
vs Temperature
1200
60
1000
800
SHUTDOWN
CURRENT
50
40
600
400
QUIESCENT
CURRENT
200
30
20
10
00
–40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
TEST CONDITION:
VCC = 5V, ALL DRIVER INPUTS TIED TO VCC.
LTC1349 • TA02
1
1 page  
LTC1349
PI FU CTIO S
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in SHUT-
DOWN 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.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Receiver 1, 2 and 3 outputs are in a high impedance
state when in SHUTDOWN mode to allow data line sharing.
Receivers 4 and 5 are kept alive in SHUTDOWN.
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
1.4V
DRIVER
OUTPUT
t LHD
0V
1.4V
t HLD
VCC
0V
V+
0V
V–
LTC1349 • F01
Figure 1. Driver Propagation Delay Timing
RX
INPUT
1.7V
RX
OUTPUT
t LHR
0.8V
VCC
1.3V
0V
t HLR
2.4V VCC
0V
LTC1349 • F02
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
DRIVER
INPUT
DRIVER
DRIVER
OUTPUT
51pF 3k
LTC1349 • TA03
Receiver Timing Test Load
RX INPUT
RX
RX
OUTPUT
51pF
LTC1349 • TA04
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1349I.PDF ] | |
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