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參數(shù)資料
| 型號： | LT1331CSW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 20-SOIC 0 to 70 |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | 0.300 INCH, PLASTIC, SO-28 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 245K |
| 代理商： | LT1331CSW |
6
LT1331
U
S
A
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 V
L
power
supply, so the power consumption from V
CC
drops to
zero. The V
CC
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 V
L
and less than 100
μ
A from V
CC
.
O
PPLICATI
U
U
Mixed 5V/3V Operation
When operated with V
CC
= 5V and V
L
= 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
V
CC
= 3.3V operation of the LT1331 results in lower driver
output swing than with V
CC
= 5V. The driver output swing,
when operated with V
CC
= 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
MIN
TYP
0.8
0.8
0.8
0.8
INPUT HIGH THRESHOLD
MIN
TYP
–
–
–
–
MANUFACTURER
Linear Technology
PART NUMBER
LT1080
LT1137A
LT1330
LT1281
All Others
SN75189
SN75189A
MAX232
SN75C185
MAX232A
MAX241
SP232
SP301
MC1489
MC1489A
DS1489
DS14C89A
COMPATIBLE
MAX
–
–
–
–
MAX
2.4
2.4
2.4
2.4
1.3
1.3
1.3
1.3
1.7
1.7
1.7
1.7
Texas Instruments
0.65
0.65
0.8
0.65
0.8
0.6
0.8
0.75
0.75
0.75
0.75
0.5
1.0
1.0
1.2
1.0
1.3
1.2
1.2
–
–
0.8
1.0
–
1.25
1.25
–
1.25
–
–
–
1.35
1.25
1.25
1.25
1.9
0.9
1.55
–
1.6
–
–
–
1.75
1.0
1.75
1.0
1.3
1.3
1.9
1.7
2.1
1.8
1.5
1.7
–
–
1.95
1.25
–
1.6
2.25
2.4
2.55
2.4
2.4
2.4
2.5
1.5
2.25
1.5
2.7
Maxim
Sipex
Motorola
National
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