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| 型号： | LTC1348CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 3.3V/5V RS232 28-SOIC |
| 标准包装： | 27 |
| 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： | 管件 |
| 产品目录页面： | 1354 (CN2011-ZH PDF) |
5
LTC1348
PI FU CTIO S
U
UU
VCC: 3V to 5.5V Input Supply Pin. This pin should be
decoupled with a 0.1
F 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 = 0.1
F 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 = 0.1
F for charge
storage.
C1+, C1–, C2+, C2–, C3+, C3–: Commutating Capacitor
Inputs. These pins require three external capacitors C =
0.1
F: 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 1
. 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
DRIVERS
RECEIVERS
ICC TYP
Shutdown
0
All Drivers Shutdown.
All Receivers Shutdown.
0.2
A
All Driver Outputs Assume High Impedance.
All Receiver Outputs Assume High Impedance.
All Driver Pull-Up Resistors Disconnect
From VCC.
Receiver
0
1
All Drivers Alive.
All Receiver Outputs in Three-State.
600
A at
Disable
3.3V,
800
A at
5V
Receiver
1
0
All Drivers Shutdown.
All Receivers Alive.
15
A
Alive
All Driver Outputs in Three-State.
All Driver Pull-Up Resistors Disconnect
From VCC.
Normal
1
All Drivers Alive.
All Receivers Alive.
600
A at
3.3V,
800
A at
5V
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