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NM485SLC
Low Power Isolated EIA-485 Driver and Receiver
KDC_NM485SLC.A04 Page 1 of 5
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FEATURES
RoHS compliant
Site compatible with NM485D
Single 5V supply
Thermal shutdown protection
EIA-485 and CCITT V.10 & V.11 compatible
Differential driver and receiver
Driver tri-state outputs active high enable
Low Prole 24 pin DIL package style
1kVrms Isolation
Thermal shutdown protection
DESCRIPTION
The NM485SLC is a low power electrically iso-
lated differential driver and receiver designed for
bi-directional data communication or multipoint
bus transmission at rates up to 2.5Mbits per
second. The device combines a tri-state dif-
ferential line driver and a differential input line
receiver. The driver and receiver have active high
and active low enables, respectively, which can
be connected together to function as direction
control. The receiver features a high output state
when the inputs are left open. Thermal shutdown
protection forces the driver into a high imped-
ance state, under line fault conditions. No external
components are needed as a single 5V supply
powers all functions either side of the isolation
boundary. The device is supplied in a low prole
24 pin plastic package.
ELECTRICAL CHARACTERISTICS
Parameter
Test conditions
Min.
Typ.
Max.
Units
Supply voltage, VCC
4.75
5.0
5.25
V
Isolated reference voltage, VREF
5.0
+VREF Current
RL=54Ω
25
mA
High level input voltage, VIH
D ENABLE, R ENABLE and DIN
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
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
70
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=-7.0V
-0.8
Short circuit output current, IOS
85
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
150
180
ns
Propagation delay time H to L, TPHL
130
150
ns
Output disable time from high level
CL=15pF
90
150
ns
Output disable time from low level
CL=15pF
90
150
ns
Output enable time to high level
CL=15pF
130
150
ns
Output enable time to low level
CL=15pF
80
150
ns
RECEIVER FUNCTION TABLE
Differential inputs A-B
R ENABLE
ROUT
VID≥0.2V
Low level
High level
-0.2V<VID<+0.2V
Low level
Undened
VID≤-0.2V
Low level
Irrelevant
High level
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
Typ.
Max.
Units
Isolation test voltage
Flash tested for 1 second
1000
Vrms
Isolation capacitance
40
pF
ABSOLUTE MAXIMUM RATINGS
Supply voltage VCC with respect to pin 11
7V
Input voltage D ENABLE, R ENABLE and DIN
7V
Receiver differential input voltage range
-14V to +14V
Output voltage range, driver
-14V to +14V
Power dissipation
1000mW
Data transmission rate
2.5Mbps
Lead temperature 1.5mm from case for 10 seconds
300C
All data taken at TA=25°C, VCC=5V.
ed
Parameter
Test conditions
NOT RECOMMENDED
OT RECOMME
FOR NEW DESIGNS
Low P