Datasheet

MAX1480A/B/C/MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R = 50Ω (RS-422) 2
Differential Driver Output
(With Load)
V
OD2
R = 27Ω (RS-485), Figure 4 1.5 5.0
V
Differential 0.3
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
ΔV
OD
R = 27Ω or 50Ω,
Figure 4
Common mode 0.3
V
Driver Common-Mode Output
Voltage
V
OC
R = 27Ω or 50Ω, Figure 4 4 V
MAX1480A/B/C 1
V
IN
= 12V
MAX1490A/B 0.25
MAX1480A/B/C 0.8
Input Current (A, B) ISO I
IN
DE´ = 0V,
V
CC_
= 0V
or 5.5V
V
IN
= -7V
MAX1490A/B 0.2
mA
MAX1480A/B/C 48
Receiver Input Resistance R
IN
-7V ≤ V
CM
≤ 12V
MAX1490A/B 12
kΩ
Receiver Differential Threshold
Voltage
V
TH
-7V ≤ V
CM
≤ 12V -0.2 +0.2 V
Receiver Input Hysteresis ΔV
TH
V
CM
= 0V 70 mV
Receiver Output/Receiver Output
Low Voltage
V
OL
Using resistor values listed in
Tables 1 and 2
0.4 V
Receiver Output/Receiver Output
High Current
I
OH
V
OUT
= 5.5V 250 µA
Driver Short-Circuit Current ISO I
OSD
-7V ≤ V
O
≤ 12V (Note 4) 100 mA
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)
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 T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
PLH
100 275
Driver Input to Output
Propagation Delay
t
PHL
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
100 275
ns
Driver Output Skew t
SKEW
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
25 90 ns
Driver Rise or Fall Time t
R,
t
F
Figures 5 and 7, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
15 40 ns
Driver Enable to Output High
(MAX1480A Only)
t
ZH
Figures 6 and 8, C
L
= 100pF, S2 closed 0.2 1.5 µs
Driver Enable to Output Low
(MAX1480A Only)
t
ZL
Figures 6 and 8, C
L
= 100pF, S1 closed 0.2 1.5 µs
Driver Disable Time from Low
(MAX1480A Only)
t
LZ
Figures 6 and 8, C
L
= 15pF, S1 closed 0.2 1.5 µs
Driver Disable Time from High
(MAX1480A Only)
t
HZ
Figures 6 and 8, C
L
= 15pF, S2 closed 0.2 1.5 µs
t
PLH
100 225
Receiver Input to Output
Propagation Delay
t
PHL
Figures 5 and 10, R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
100 225
ns