參數(shù)資料
型號： MAX1490A
廠商： Maxim Integrated Products, Inc.
英文描述： Complete, Isolated RS-485/RS-422 Data Interface(2.5Mbps，全雙工，完全隔離的RS-485/422收發(fā)器)
中文描述： 完備的隔離型、RS-485/RS-422數(shù)據(jù)接口
文件頁數(shù)： 4/20頁
文件大小： 315K
代理商： MAX1490A
M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
4
_______________________________________________________________________________________
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, 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 and MAX1490A/B provide elec-
trical isolation between logic ground and signal paths, they do not provide isolation between external shields and the signal
paths (see Isolated Common Connectionsection).
SWITCHING CHARACTERISTICS—MAX1480B/MAX1490B
(V
CC_
= 5V ±10%, FS = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC_
= 5V and T
A
= +25°C.)
Figures 6 and 8, C
L
= 100pF, S1 closed
μs
35
100
t
ZL
Driver Enable to Output Low
(MAX1480B only)
Figures 6 and 8, C
L
= 15pF, S2 closed
μs
13
50
t
HZ
Driver Disable Time from High
(MAX1480B only)
Figures 6 and 8, C
L
= 15pF, S1 closed
μs
13
50
Figures 5 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
Figures 5 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
μs
1.0
100
1.0
2.0
800
2.0
t
PHL
t
SKEW
t
R,
t
F
t
LZ
Driver Disable Time from Low
(MAX1480B only)
Driver Input to Output
Propagation Delay
Driver Output Skew
Driver Rise or Fall Time
ns
μs
CONDITIONS
Figures 6 and 9, C
L
= 100pF, S2 closed
Figures 6 and 9, C
L
= 100pF, S1 closed
Figures 5 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
Figures 5 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
μs
μs
35
35
100
100
t
ZH(SHDN)
t
ZL(SHDN)
Shutdown to Driver Output High
Shutdown to Driver Output Low
1.0
2.0
t
PLH
Figures 6 and 8, C
L
= 100pF, S2 closed
Figures 5 and 10, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
μs
35
100
t
ZH
Driver Enable to Output High
(MAX1480B only)
0.8
0.8
2.0
2.0
t
PLH
t
PHL
t
PLH
, t
PHL
< 50% of data period
Mbps
μs
0.25
f
MAX
t
SHDN
Maximum Data Rate
Time to Shutdown
Figures 5 and 10, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
μs
Receiver Input to Output
Propagation Delay
I
t
PLH
- t
PHL
I
Differential
Receiver Skew
ns
200
t
SKD
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
100
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