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參數(shù)資料
| 型號(hào)： | LT1331CSW#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX 5V/3V RS232 SHDWN 28SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3.3 V，5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC |
| 包裝： | 帶卷 (TR) |
6
LT1331
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Power Saving Operational Modes
The LT1331 has both shutdown and driver disable oper-
ating modes. These operating modes can optimize power
consumption based upon applications needs.
The shutdown control turns off all circuitry except for
Low-Q RX5. RX5 operates entirely from the VL power
supply, so the power consumption from VCC drops to
zero. The VCC power supply may be turned off while in
shutdwon, which may allow greater power savings in
some systems. When RX5 detects a signal, this informa-
tion can be used to wake up the system for full operation.
If more than one line must be monitored, the driver
disable mode provides a power efficient operating
option. The driver disable mode turns off the charge
pumps and RS232 drivers, but keeps all five receivers
active. Power consumption in driver disable mode is 3mA
from VL and less than 100A from VCC.
Mixed 5V/3V Operation
When operated with VCC = 5V and VL = 3.3V supplies, the
RS232 drivers meet or exceed all RS232 or V.28 commu-
nication interface standards. Data rates up to 120kbaud
are supported, and all standard RS232 compatible mice
may be driven by the LT1331.
3V Operation
VCC = 3.3V operation of the LT1331 results in lower driver
output swing than with VCC = 5V. The driver output swing,
when operated with VCC = 3.3V, is guaranteed to be at
least –2.7V to 3.7V, with typical swing being –3.3V to 4V.
This insures compatibility with all commonly used RS232
and RS562 interface circuits. Table 1 summarizes the
receiver input threshold specifications for RS232 circuits
from many manufacturers.
Table 1. Commonly Used RS232 Interface Circuit Receiver Thresholds
INPUT LOW THRESHOLD
INPUT HIGH THRESHOLD
MANUFACTURER
PART NUMBER
COMPATIBLE
MIN
TYP
MAX
MIN
TYP
MAX
Linear Technology
LT1080
0.8
1.3
–
1.7
2.4
LT1137A
0.8
1.3
–
1.7
2.4
LT1330
0.8
1.3
–
1.7
2.4
LT1281
0.8
1.3
–
1.7
2.4
All Others
Texas Instruments
SN75189
0.65
1.0
1.25
0.9
1.3
1.6
SN75189A
0.65
1.0
1.25
1.55
1.9
2.25
MAX232
0.8
1.2
–
1.7
2.4
SN75C185
0.65
1.0
1.25
1.6
2.1
2.55
Maxim
MAX232A
0.8
1.3
–
1.8
2.4
MAX241
0.6
1.2
–
1.5
2.4
Sipex
SP232
0.8
1.2
–
1.7
2.4
SP301
0.75
–
1.35
1.75
–
2.5
Motorola
MC1489
0.75
–
1.25
1.0
–
1.5
MC1489A
0.75
0.8
1.25
1.75
1.95
2.25
National
DS1489
0.75
1.0
1.25
1.0
1.25
1.5
DS14C89A
0.5
–
1.9
1.3
–
2.7
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