Complete, Isolated RS-485/RS-422
Data Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
CC_
= 5V ±10%, V
FS
= V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Differential Driver Output
(With Load)
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
Driver Common-Mode Output
Voltage
SYMBOL
V
OD2
∆V
OD
CONDITIONS
R = 50Ω (RS-422)
R = 27Ω (RS-485), Figure 4
R = 27Ω or 50Ω,
Figure 4
Differential
Common mode
MIN
2
1.5
5.0
0.3
V
0.3
4
MAX1490A/B
MAX1480A/B/C
MAX1490A/B
MAX1480A/B/C
12
-0.2
70
0.4
250
100
+0.2
0.25
1
0.2
0.8
kΩ
V
mV
V
µA
mA
mA
V
TYP
MAX
UNITS
V
MAX1480A/B/C/MAX1490A/B
V
OC
R = 27Ω or 50Ω, Figure 4
V
IN
= 12V
V
IN
= -7V
Input Current (A, B)
ISO I
IN
DE´ = 0V,
V
CC_
= 0V
or 5.5V
Receiver Input Resistance
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output/Receiver
Output
Low Voltage
Receiver Output/Receiver
Output
High Current
Driver Short-Circuit Current
R
IN
V
TH
∆V
TH
V
OL
I
OH
ISO I
OSD
-7V
≤
V
CM
≤
12V
-7V
≤
V
CM
≤
12V
V
CM
= 0V
Using resistor values listed in
Tables 1 and 2
V
OUT
= 5.5V
-7V
≤
V
O
≤
12V (Note 4)
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A
(V
CC_
= 5V ±10%, FS = V
CC_
, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and TA = +25°C.)
PARAMETER
Driver Input to Output
Propagation Delay
Driver Output Skew
Driver Rise or Fall Time
Driver Enable to Output High
(MAX1480A Only)
Driver Enable to Output Low
(MAX1480A Only)
Driver Disable Time from Low
(MAX1480A Only)
Driver Disable Time from High
(MAX1480A Only)
Receiver Input to Output
Propagation Delay
SYMBOL
t
PLH
t
PHL
t
SKEW
t
R,
t
F
t
ZH
t
ZL
t
LZ
t
HZ
t
PLH
t
PHL
CONDITIONS
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
Figures 6 and 8, C
L
= 100pF, S2 closed
Figures 6 and 8, C
L
= 100pF, S1 closed
Figures 6 and 8, C
L
= 15pF, S1 closed
Figures 6 and 8, C
L
= 15pF, S2 closed
Figures 5 and 10, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
MIN
TYP
100
100
25
15
0.2
0.2
0.2
0.2
100
100
MAX
275
275
90
40
1.5
1.5
1.5
1.5
225
225
UNITS
ns
ns
ns
µs
µs
µs
µs
ns
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
