NM485D6S5MC
Isolated RS485 Driver DC/DC
KDC_NM485D6S5MC.A01 age 1 of 11
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FEATURES
UL60950 recognition pending for 250Vrms
reinforced insulation
ANSI/AAMI ES60601-1, 2 MOOPs, 1 MOPP
recognition pending
Patents pending
SMD compatible
+6V, -6V unregulated and +5V regulated
isolated outputs
Differential driver and receiver
500kbps data rate
Complies with ANSI TIA/EIA RS-485-A-1998
and ISO 8482: 1987(E)
Industrial temperature range -40°C to
+85°C
Tested at 3000Vac rms ‘Hi Pot Test’
SELECTION GUIDE
Order Code
1
NM485D6S5MC
MODULE CHARACTERISTICS
DRIVER
Parameter Test conditions Min. Typ. Max. Units Symbol
Differential Output
Voltages
Loaded R
L = 100 (RS-422), See Figure 1 2.0 3.6
VV
OD
Loaded RL = 54 (RS-485) 1.5 3.6
Short Circuit Output
Current
250 mA I
OS
Complementary
Output States
R
L = 54 or 100, see figure 1 0.2 V ∆ |VOD|
Common-mode
Output Voltages
R
L = 54 or 100, see figure 1 3.0 V VOC
Complementary
Output States
R
L = 54 or 100, see figure 1 0.2 V ∆ |VOC|
Input Threshold Low
0.25 x
Vcc
VV
IL
Input Threshold High
0.7 x
V
CC
VVIH
Input Current -10 +0.01 +10 µA II
RECEIVER
2
Parameter Test conditions Min. Typ. Max. Units Symbol
Differential Input
Threshold Voltages
-7V < V
CM < +12V -200 -125 -30 mV VTH
Input Voltages
Hysteresis
V
OC = 0V 15 mV VHYS
Input Current (A, B) -100 +125 µA II
Line Input Resistance -7V < VCM < +12V 96 k RIN
Tristate Leakage
Current
±1 µA I
OZR
Output Voltage Low 0.2 0.4 V VOLRxD
Output Voltage High
V
cc -
0.3
Vcc -
0.2
VV
OHRxD
Short-Circuit Current 100 mA
Common-Mode
Transient Immunity
V
CM = 1 kV, transient magnitude = 800V 25 KV/µS
ABSOLUTE MAXIMUM RATINGS
Supply voltage VCC with respect to pin 11 6V
Bus Terminal Voltages -9V to +14V
Logic Terminal Voltage -0.5V to V
cc +0.5V
Data transmission rate 500Kbps
1. Components are supplied in tape and reel packaging, please refer to tape and reel specification section. Orderable part numbers are
NM485D6S5MC-R7 (80 pieces per reel), or NM485D6S5MC-R13 (350 pieces per reel).
2. VCM is the common-mode potential difference between the logic and bus sides. The transient magnitude is the range over which the
common mode is slewed. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
Isolated DC-DC Power Supply
output lines
Isolation
Isolated 485 Tranceiver
input lines
0V
Vcc
3.3V
Regulator
output lines
input lines
5V
Regulator
0V
6V
-6V
0V
0V
6V
-6V
5V
5V regulated
PRODUCT OVERVIEW
The NM485D6S5MC is a low power electrically
isolated differential driver and receiver designed
for bi-directional data communication or multipoint
bus transmission. The device combines a tri-state
differential 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.
No external components are needed as a single
5V supply powers all functions either side of the
isolation boundary. NM485D655MC also provides
a regulated 5V, unregulated 6V and -6V isolated
supply’s for system use.
