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| 型号： | NM485DC |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 1/6页 |
| 文件大小： | 0K |
| 描述： | ISOLATED INTERFACE EIA-485 DL |
| 标准包装： | 15 |
| 系列： | IsoLoop® |
| 类型： | 收发器，隔离式 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS485 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-DIP（0.667"，16.95mm） |
| 供应商设备封装： | 24-DIL |
| 包装： | 管件 |
| 产品目录页面： | 2721 (CN2011-ZH PDF) |
| 其它名称： | 811-1445-5 |
NM485DC Series
Isolated Dual EIA-485 Driver and Receiver
KII_NM485DC.A05 Page 1 of 6
www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
ELECTRICAL CHARACTERISTICS
Parameter
Test conditions
Min.
Typ.
Max.
Units
Supply voltage, VCC
4.75
5.0
5.25
V
High level input voltage, VIH
DX ENABLE and D inputs
2.8
V
Low level input voltage, VIL
0.8
V
Common mode output voltage, VOC
Driver
-7.0
12
V
High level output current IOH
-60
mA
Low level output current, IOL
60
mA
Common mode input voltage, VIC
Receiver
±12
V
Differential input voltage, VID
±12
V
High level output current, IOH
-5.0
mA
Low level output current, IOL
25
mA
EACH RECEIVER ELECTRICAL CHARACTERISTICS
Parameter
Test conditions
Min.
Typ.
Max.
Units
High threshold differential input, VTH
VO=2.7V, IO=-0.4mA
0.2
V
Low threshold differential input, VTL
VO=0.5V, IO=16mA
-0.2
V
Input hysteresis, ΔVT
50
mV
High level output voltage, VOH
VID=200mV, IOH=-5.0mA
2.7
V
Low level output voltage, VOL
VID=200mV, IOL=25mA
0.8
V
Line input current, II
Other input at 0V, VI=12V
1.0
mA
Other input at 0V, VI=-12V
-0.8
mA
Short circuit output current, IOS
-15
mA
Input resistance, RI
12
KΩ
RECEIVER SWITCHING CHARACTERISTICS
Parameter
Test conditions
Min.
Typ.
Max.
Units
Propagation delay time L to H, TPLH
VID=-1.5V to 1.5V, CL=15pF
70
155
ns
Propagation delay time H to L, TPHL
72
135
ns
RECEIVER FUNCTION TABLE
Differential inputs A-B
RXOUT
VID≥0.2V
High level
-0.2V<VID<+0.2V
Undened
VID≤-0.2V
Low level
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
Typ.
Max.
Units
Isolation test voltage
Flash tested for 1 second
1000
Vrms
ABSOLUTE MAXIMUM RATINGS
Supply voltage VCC with respect to pin 11
7V
Input voltage DX ENABLE and D inputs
7V
Input voltage range, receiver A or B inputs
-25V to +25V
Receiver differential input voltage range
-25V to +25V
Output voltage range, driver
-10V to +15V
Power dissipation
2000mW
Isolation capacitance
40pF
Isolation voltage (ash tested for 1 second)
1000Vrms
Data transmission rate
1.25Mbps
Lead temperature 1.5mm from case for 10 seconds
300C
All data taken at TA=25°C, VCC=5V.
FEATURES
RoHS compliant
Single 5V supply
Thermal shutdown protection
EIA-485 and CCITT V.28 compatible
Dual differential driver and receiver
Driver tri-state outputs active high enable
Low Prole 24 pin DIL package style
1kVrms Isolation
DESCRIPTION
The NM485DC is an electrically isolated dual
differential driver and receiver designed for bal-
anced mulipoint bus transmission at rates up to
1.25Mbits per second. The device provides two
receive channels and two driver channels. The
two driver channels have an active high enable.
No external components are needed and a single
5V input supply powers all functions either side of
the isolation boundary. The driver outputs provide
limiting for positive and negative currents and
thermal shutdown protection from line fault condi-
tions on the transmission bus line. The receiver
outputs will always be high if the receiver inputs
are open. The isolation voltage between input and
output is 1000Vrms, the devices are supplied in a
low prole 24 pin DIL plastic package.
ual
N
ELECTRICAL CHARACTERISTICS
NOT RECOMMENDED
OT RECOMME
FOR NEW DESIGNS
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