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参数资料
型号： LTC1348ISW#TR
厂商： Linear Technology
文件页数： 1/8页
文件大小： 0K
描述： IC TXRX RS232 3.3-5V LPWR 28SOIC
标准包装： 1,000
类型： 收发器
驱动器/接收器数： 3/5
规程： RS232
电源电压： 3 V ~ 5.5 V
安装类型： 表面贴装
封装/外壳： 28-SOIC（0.295"，7.50mm 宽）
供应商设备封装： 28-SOIC
包装： 带卷 (TR)
1
LTC1348
3.3V/5V Low Power RS232
3-Driver/5-Receiver Transceiver
S
FEATURE
D
U
ESCRIPTIO
s
Low Supply Current: 600
A at 3.3V
s
Supply Current in Shutdown: 0.2
A
s
Supply Current in Receiver Alive Mode: 15
A
s
ESD Protection over
±10kV
s
Operates from a Single 3V to 5.5V Supply
s
Operates to 120kBaud with 0.1
F 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
The LTC
1348 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. The charge pump only
requires five 0.1
F 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 600A at 3.3V and
800
A at 5V in the no load condition. In Shutdown mode,
the supply current is further reduced to 0.2
A. In Receiver
Alive mode, all five receivers are kept alive and the supply
current is 15
A. 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,
3k
.Bothdriveroutputsandreceiverinputscanbeforced
to
±25V without damage and can survive multiple ±10kV
ESD strikes.
U
S
A
O
PPLICATI
s
Notebook Computers
s
Palmtop Computers
s
Printers
s
Portable Instruments
LT1348 TA01
C5
0.1
F
C2
0.1
F
C3
0.1
F
C4
0.1
F
LTC1348
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DR 1 OUT
RX1 IN
DR 2 OUT
RX2 IN
RX3 IN
RX4 IN
DR 3 OUT
RX5 IN
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DR 1 IN
RX1 OUT
DR 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR 3 IN
RX5 OUT
DREN
RXEN
V–
V+
VCC
GND
C1
0.1
F
3-Drivers/5-Receivers with Shutdown
U
A
O
PPLICATI
TYPICAL
Supply Current
, LTC and LT are registered trademarks of Linear Technology Corporation.
TEMPERATURE (C)
–40
SUPPLY
CURRENT
(mA)
1.4
20
LT1348 TA02
0.8
0.4
–20
0
40
0.2
0
1.6
1.2
1.0
0.6
SHUTDOWN
CURRENT
(
A)
1.4
0.8
0.4
0.2
0
1.6
1.2
1.0
0.6
60
80
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
VCC = 5V
VCC = 3.3V
OR 5V
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