NM485DC Datasheet, PDF (1/6 Pages) Murata Manufacturing Co., Ltd. – Isolated Dual EIA-485 Driver and Receiver

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NM485DC Series
FOR NEW ^{DESIGNS Isolated Dual EIA-485 Driver and Receiver}
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 Profile 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 profile 24 pin DIL plastic package.
Ḥ
For full details go to
www.murata-ps.com/rohs
ELECTRICAL CHARACTERISTICS
Parameter
Supply voltage, VCC
High level input voltage, VIH
Low level input voltage, VIL
Common mode output voltage, VOC
High level output current IOH
Low level output current, IOL
Common mode input voltage, VIC
Differential input voltage, VID
High level output current, IOH
Low level output current, IOL
Test conditions
DX ENABLE and D inputs
Driver
Receiver
EACH RECEIVER ELECTRICAL CHARACTERISTICS
Parameter
Test conditions
High threshold differential input, VTH VO=2.7V, IO=-0.4mA
Low threshold differential input, VTL VO=0.5V, IO=16mA
Input hysteresis, ΔVT
High level output voltage, VOH
VID=200mV, IOH=-5.0mA
Low level output voltage, VOL
VID=200mV, IOL=25mA
Line input current, II
Other input at 0V, VI=12V
Other input at 0V, VI=-12V
Short circuit output current, IOS
Input resistance, RI
RECEIVER SWITCHING CHARACTERISTICS
Parameter
Test conditions
Propagation delay time L to H, TPLH VID=-1.5V to 1.5V, CL=15pF
Propagation delay time H to L, TPHL
RECEIVER FUNCTION TABLE
Differential inputs A-B
VID≥0.2V
-0.2V<VID<+0.2V
VID≤-0.2V
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Conditions
Flash tested for 1 second
ABSOLUTE MAXIMUM RATINGS
Supply voltage VCC with respect to pin 11
Input voltage DX ENABLE and D inputs
Input voltage range, receiver A or B inputs
Receiver differential input voltage range
Output voltage range, driver
Power dissipation
Isolation capacitance
Isolation voltage (flash tested for 1 second)
Data transmission rate
Lead temperature 1.5mm from case for 10 seconds
All data taken at TA=25°C, VCC=5V.
Min. Typ. Max. Units
4.75 5.0 5.25
V
2.8
V
0.8
V
-7.0
12
V
-60
mA
60
mA
±12
V
±12
V
-5.0 mA
25
mA
Min. Typ. Max. Units
0.2
V
-0.2
V
50
mV
2.7
V
0.8
V
1.0
mA
-0.8 mA
-15
mA
12
KΩ
Min. Typ. Max. Units
70
155
ns
72
135
ns
RXOUT
High level
Undefined
Low level
Min. Typ. Max. Units
1000
Vrms
7V
7V
-25V to +25V
-25V to +25V
-10V to +15V
2000mW
40pF
1000Vrms
1.25Mbps
300ºC
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KII_NM485DC.A05 Page 1 of 6