Datasheet

MAX3480A/MAX3480B
Complete, Isolated, 3.3V
RS-485/RS-422 Data Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC1
= V
CC2
= V
CC4
= V
CC5
= 3.0V to 3.6V, FS = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
V
CC
= V
CC1
= V
CC2
= V
CC4
= V
CC5
= 3.3V and T
A
= +25°C.) (Notes 1, 2, 3)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
With Respect to GND:
Supply Voltage (V
CC
1,
V
CC
2,
V
CC
4,
V
CC
5
).........-0.3V to +3.8V
Supply Voltage (V
CC3
) ..........................................-0.3V to +7V
Control Input Voltage (SD, FS)................-0.3V to (V
CC
+ 0.3V)
Receiver Output Voltage (RO
).................-0.3V to (V
CC
+ 0.3V)
With Respect to ISO COM:
Control Input Voltage (ISO DE _) .........-0.3V to (ISO V
CC
+ 0.3V)
Driver Input Voltage (ISO DI _).........-0.3V to (ISO V
CC
+ 0.3V)
Receiver Output Voltage (ISO RO _)......-0.3V to (ISO V
CC
+ 0.3V)
Driver Output Voltage (A, B)................................-8V to +12.5V
Receiver Input Voltage (A, B)..............................-8V to +12.5V
LED Forward Current (DI, DE, ISO RO LED) ......................50mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)...............727mW
Operating Temperature Ranges
MAX3480_CPI......................................................0°C to +70°C
MAX3480_EPI...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
R = 50Ω (RS-422)
T
A
= +25°C, V
ISO
= 50V
DC
T
A
= +25°C, V
ISO
= 50V
DC
FS = 0V
DE
´
, DI
´
(Figure 1)
DE
´
, DI
´
(Figure 1)
FS high
FS low
SD = V
CC3
Low
High
R
L
= 54Ω
MAX3480A,
DE
´
= V
CC
or open
R
L
= ∞
CONDITIONS
V
0.3
V
OD2
Differential Driver Output (no load) V
2
V
OD1
8
pF10C
ISO
Isolation Capacitance
MΩ100 10,000R
ISO
Isolation Resistance
V0.4V
IL
Input Low Voltage
VV
CC
- 0.4V
IH
Input High Voltage
pA10I
FSM
FS Input Leakage Current
µA50I
FSL
FS Input Pull-Up Current
V
0.8V
FSL
FS Input Threshold
2.4V
FSH
180 260
V
600
V
S
3.0 3.3 3.6Supply Voltage
µAShutdown Supply Current (Note 3) 0.2
mA
240
I
CC
Operating Supply Current
280
120 200
UNITSMIN TYP MAXSYMBOLPARAMETER
I
SHDN
R = 27Ω (RS-485), Figure 3 1.5 5
Switch Frequency
f
SWL
kHz
R
L
= 54Ω
R = 27Ω or 50Ω,
Figure 3
R = 27Ω or 50Ω, Figure 4
V
4
∆V
OD
Change in Magnitude of Driver
Output Voltage for Complementary
Output States
f
SWH
900
R
L
= ∞
FS = V
CC
or open
MAX3480B,
DE
´
= V
CC
or open
Differential Driver Output (with load)
Driver Common-Mode Output V
OC
V
Differential
0.3Common Mode