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| 型号： | LT1237CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 5V RS232 ADV LOPWR28SOIC |
| 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： | 4.5 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 |
5
LT1237
CC
HARA TERISTICS
UW
A
TYPICALPERFOR
CE
Receiver Short-Circuit Current
Driver Short-Circuit Current
TEMPERATURE (
°C)
–55
SHORT-CIRCUIT
CURRENT
(mA)
20
25
30
25
75
1237 G10
15
10
–25
0
50
100
125
5
0
ISC
+
ISC
–
TEMPERATURE (
°C)
–55
0
SHORT-CIRCUIT
CURRENT
(mA)
20
50
0
50
75
1237 G11
10
40
30
–25
25
100
125
RX1 TO RX4
ISC
+
RX1 TO RX4
ISC
–
RX5 ISC
–
RX5 ISC
+
Receiver Output Waveforms
DRIVER OUTPUT
RL = 3k
DRIVER OUTPUT
RL = 3k
CL = 2500pF
RX5 OUTPUT
CL = 50pF
1237 G12
RX1 TO RX4
OUTPUT
CL = 50pF
INPUT
1237 G13
INPUT
Driver Output Waveforms
PI FU CTIO S
U
UU
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1
F ceramic capacitor close to the package pin.
Insufficient supply bypassing can result in low output
drive levels and erratic charge pump operation.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Operating Mode Control.
A logic low puts the device in the low power shutdown
mode. All three drivers and four receivers (RX1, RX2, RX3,
and RX4) assume a high impedance output state in shut-
down. Only receiver RX5 remains active while the trans-
ceiver is in shutdown. The transceiver consumes only
60
A of supply current while in shutdown. A logic high
fully enables the transceiver.
DRIVER DISABLE: This pin provides an alternate control
for the charge pump and RS232 drivers. A logic high on
this pin shuts down the charge pump and places all driver
outputs in a high impedance state. All five receivers remain
active under these conditions. Floating the driver disable
pin or driving it to a logic low level fully enables the
transceiver. A logic low on the ON/OFF pin supersedes the
state of the DRIVER DISABLE pin. Supply current drops to
3mA when in driver disable mode.
V+: Positive Supply Output (RS232 Drivers). V+
≈ 2VCC –
1.5V. This pin requires an external charge storage capaci-
tor C
≥ 1.0F, tied to ground or VCC. Larger value capaci-
tors may be used to reduce supply ripple. The ratio of the
capacitors on V+ and V – should be greater than 5 to 1.
V–: Negative Supply Output (RS232 Drivers). V –
≈
–(2VCC – 2.5V). This pin requires an external charge
storage capacitor C
≥ 0.1F. See the Applications Infor-
mation section for guidance in choosing filter capacitors
for V+ and V –.
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