Complete, Isolated RS-485/RS-422
Data Interface
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 TA = +25°C.)
PARAMETER
Driver Disable Time from Low
(MAX1480C Only)
Driver Disable Time from High
(MAX1480C Only)
Receiver Input to Output
Propagation Delay
|t
PLH
- t
PHL
| Differential Receiver
Skew
Maximum Data Rate
Time to Shutdown
Shutdown to Driver Output High
Shutdown to Driver Output Low
SYMBOL
t
LZ
t
HZ
t
PLH
t
PHL
t
SKD
f
MAX
t
SHDN
t
ZH(SHDN)
t
ZL(SHDN)
Figures 6 and 9, C
L
= 100pF, S2 closed
Figures 6 and 9, C
L
= 100pF, S1 closed
CONDITIONS
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
Figures 5 and 10, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
t
PLH
, t
PHL
< 50% of data period
0.25
100
35
35
100
100
MIN
TYP
2.0
2.0
2
2
1200
MAX
4.5
4.5
3.0
3.0
UNITS
µs
µs
µs
ns
Mbps
µs
µs
µs
MAX1480A/B/C, MAX1490A/B
5
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).
_______________________________________________________________________________________
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