Datasheet

MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
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Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to logic-
side ground (GND_), unless otherwise specified.
Note 2: For DE´ and DI´ pin descriptions, see
Detailed Block Diagram and Typical Application Circuit (Figure 1 for MAX1480A/
MAX1480B/MAX1480C, Figure 2 for MAX1490A/MAX1490B).
Note 3: Shutdown supply current is the current at V
CC1
and V
CC2
when shutdown is enabled.
Note 4: Applies to peak current (see
Typical Operating Characteristics ). Although the MAX1480A/B/C and MAX1490A/B provide
electrical isolation between logic ground and signal paths, they do not provide isolation between external shields and the
signal paths (see
Isolated Common Connection section).
SWITCHING CHARACTERISTICS—MAX1480B/MAX1480C/MAX1490B (continued)
(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
Driver Disable Time from Low
(MAX1480C Only)
t
LZ
Figures 6 and 8, C
L
= 15pF, S1 closed 2.0 4.5 µs
Driver Disable Time from High
(MAX1480C Only)
t
HZ
Figures 6 and 8, C
L
= 15pF, S2 closed 2.0 4.5 µs
t
PLH
2 3.0
Receiver Input to Output
Propagation Delay
t
PHL
Figures 5 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
2 3.0
µs
|t
PLH
- t
PHL
| Differential Receiver
Skew
t
SKD
Figures 5 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
1200 ns
Maximum Data Rate f
MAX
t
PLH
, t
PHL
< 50% of data period 0.25 Mbps
Time to Shutdown t
SHDN
100 µs
Shutdown to Driver Output High t
ZH
(
SHDN
)
Figures 6 and 9, C
L
= 100pF, S2 closed 35 100 µs
Shutdown to Driver Output Low t
ZL
(
SHDN
)
Figures 6 and 9, C
L
= 100pF, S1 closed 35 100 µs