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PDF LTC1338 Data sheet ( Hoja de datos )
| Número de pieza | LTC1338 | |
| Descripción | 5V Low Power RS232 5-Driver/3-Receiver Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1338
5V Low Power RS232
5-Driver/3-Receiver Transceiver
FEATURES
s Low Supply Current: 500µA
s 0.2µA Supply Current in SHUTDOWN
s 50µA Supply Current in RECEIVER ALIVE Mode
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 Flowthrough Architecture
APPLICATI S
s Battery-Powered Modems
s Battery-Powered DCE
s Notebook Computers
s Palmtop Computers
DESCRIPTIO
The LTC1338 is a 5-driver/ 3-receiver RS232 trans-
ceiver with very low supply current. In the no load
condition, the supply current is only 500µA. The charge
pump only requires four 0.1µF capacitors.
In SHUTDOWN mode, the supply current is further
reduced to 0.2µA. In RECEIVER ALIVE mode, all three
receivers are kept alive and the supply current is 50µA.
All RS232 outputs assume a high impedance state in
SHUTDOWN and with the power off.
The LTC1338 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
5-Drivers/3-Receivers with SHUTDOWN
V+ 1
VCC
C2
0.1µF
DRIVER 1 OUT
DRIVER 2 OUT
RX1 IN
DRIVER 3 OUT
RX2 IN
DRIVER 4 OUT
RX3 IN
DRIVER 5 OUT
RX ENABLE
NC
2
3
4
5
6
7
8
9
10
11
12
13
14
LTC1338
28 V–
27
26
C3
0.1µF
25
DRIVER 1 IN
24
DRIVER 2 IN
23
RX1 OUT
22
DRIVER 3 IN
21
RX2 OUT
20
DRIVER 4 IN
19
RX3 OUT
18
DRIVER 5 IN
17
GND
16
DRIVER ENABLE
15
NC
C4
0.1µF
LTC1338 • TA01
Supply Current
1200
1.2
1000
1.0
800
600 QUIESCENT
CURRENT
400
SHUTDOWN
CURRENT
200
0.8
0.6
0.4
0.2
0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80
TEST CONDITION:
VCC = 5V, ALL DRIVER INPUTS TIED TO VCC.
0
100
LTC1338 • TA02
1
1 page  
LTC1338
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, 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.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in SHUT-
DOWN or RECEIVER DISABLE mode to allow data line
sharing.
Table 1. Functional Description
MODE
SHUTDOWN
RX ENABLE
0
DR ENABLE
0
Receiver Disable
0
1
RECEIVER ALIVE
Normal
1
1
0
1
DRIVERS
All driver outputs are
high impedance.
All drivers alive.
All driver outputs are
high impedance.
All drivers alive.
RECEIVERS
All receiver outputs are
high impedance.
All receiver outputs are
high impedance.
All receivers alive.
All receivers alive.
ICC (µA)(TYP)
0.2
500
50
500
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
1.4V
DRIVER
OUTPUT
t LHD
0V
1.4V
t HLD
VCC RX
0V INPUT
V+
0V
V–
LTC1338 • F01
RX
OUTPUT
t LHR
1.7V
0.8V
VCC
1.3V
0V
t HLR
2.4V VCC
0V
LTC1338 • F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1338.PDF ] | |
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