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參數資料
| 型號： | 508656X |
| 英文描述： | IC |
| 中文描述： | 集成電路 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 200K |
| 代理商： | 508656X |
1
LTC1487
Ultra-Low Power RS485
with Low EMI, Shutdown
and High Input Impedance
S
FEATURE
D
U
ESCRIPTIO
The LTC
1487 is an ultra-low power differential line trans-
ceiver designed with high impedance inputs allowing up to
256 transceivers to share a single bus. It meets the
requirements of RS485 and RS422. The LTC1487 features
output drivers with controlled slew rate, decreasing the
EMI radiated from the RS485 lines, and improving signal
fidelity with misterminated lines. The CMOS design offers
significant power savings without sacrificing ruggedness
against overload or ESD damage. Typical quiescent cur-
rent is only 80
μ
A while operating and 1
μ
A in shutdown.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common-mode range. Excessive power dissipation
caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. The receiver has a fail-safe
feature which guarantees a high output state when the
inputs are left open. I/O pins are protected against multiple
ESD strikes of over
±
10kV using the Human Body Model.
The LTC1487 is fully specified over the commercial tem-
perature range and is available in 8-pin DIP and SO
packages.
I
High Input Impedance: Up to 256 Transceivers
on the Bus
I
Low Power: I
CC
= 120
μ
A Max with Driver Disabled
I
I
CC
= 200
μ
A Max with Driver Enabled, No Load
I
1
μ
A Quiescent Current in Shutdown Mode
I
Controlled Slew Rate Driver for Reduced EMI
I
Single 5V Supply
I
ESD Protection to
±
10kV On Receiver Inputs and
Driver outputs
I
–7V to 12V Common-Mode Range Permits
±
7V
Ground Difference Between Devices on the Data Line
I
Thermal Shutdown Protection
I
Power Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
I
Driver Maintains High Impedance in Three-State
or with the Power Off
I
Pin Compatible with the LTC485
U
A
O
PPLICATI
TYPICAL
I
Battery-Powered RS485/RS422 Applications
I
Low Power RS485/RS422 Transceiver
I
Level Translator
U
S
A
O
PPLICATI
R
1
2
3
RO
RE
DE
120
DI
7
6
7
6
4
1
2
3
4
D
R
D
RO
RE
DE
DI
LTC1487 TA01
120
330
LTC1487
LTC1487
EQUIVALENT LOAD OF 256
LTC1487 TRANSCEIVERS
2000 FEET OF TWISTED-PAIR WIRE
4.7nF
DI
A
B
RO
R
LTC1487 TA02
, LTC and LT are registered trademarks of Linear Technology Corporation.
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相關代理商/技術參數 |
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| 50865-7 | 功能描述:CONN SOCKET RCPT .034-.041 TIN RoHS:否 類別:連接器，互連式 >> 端子 - PC 引腳插座，插口 系列:4 標準包裝:500 系列:324 Tail Type:標準尾 端子:陷形 長度 - 總體:0.602"（15.29mm） Accepts Pin Diameter:0.032" ~ 0.046" (0.81mm ~ 1.17mm) 安裝孔直徑:0.094" (2.39mm) Pin Hole Diameter:0.064" (1.63mm) 法蘭直徑:0.125"（3.18mm） Tail Diameter:0.040" (1.02mm) Socket Depth:0.195" (4.95mm) 觸點材料:銅鈹 觸點表面涂層:金 觸點涂層厚度:30µin（0.76µm） 包裝:散裝 特點:- 工作溫度:-55°C ~ 125°C 板厚度:0.188" (4.78mm) Insertion Force:- 其它名稱:0324-5151534271000324515153427100324515153427100 |
| 508657R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC SMD |
| 50865-8 | 功能描述:IC 與器件插座 MINI SPRING SKT RoHS:否 制造商:Molex 產品:LGA Sockets 節距:1.02 mm 排數: 位置/觸點數量:2011 觸點電鍍:Gold 安裝風格:SMD/SMT 端接類型:Solder 插座/封裝類型:LGA 2011 工作溫度范圍:- 40 C to + 100 C |
| 50866-7226 | 制造商:Molex 功能描述: |
| 508669A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC SMD |
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