參數(shù)資料
型號： MAX1490B
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)： 3/20頁
文件大?。?/td> 315K
代理商： MAX1490B
M
Complete, Isolated,
RS -485/RS -422 Data Interfac e
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(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.)
(Notes 1, 2)
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A
(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.)
R = 50
(RS-422)
R = 27
(RS-485), Figure 4
2
R = 27
or 50
, Figure 4
V
0.3
V
OD
CONDITIONS
Change in Magnitude of
Driver Output Voltage for
Complementary Output States
V
1.5
5
V
OD2
Differential Driver Output
(with load)
DE
′
= 0V, V
CC_
= 0V or 5.5V
-7V
≤
V
CM
≤
12V
-7V
≤
V
CM
≤
12V
V
CM
= 0V
mA
0.8
ISO I
IN
Input Current (A, B)
k
V
mV
12
-0.2
R
IN
V
TH
V
TH
Receiver Input Resistance
Receiver Differential Threshold
Receiver Input Hysteresis
Receiver Output/Receiver
Output Low Voltage
R = 27
or 50
, Figure 4
0.2
70
V
4
V
OC
Driver Common-Mode Output
1.0
V
8
V
OD1
Differential Driver Output
(no load)
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
OUT
= 5.5V
μA
250
I
OH
Receiver Output/Receiver
Output High Current
Driver Short-Circuit Current
Using resistor values listed in Tables 1 and 2
-7V
≤
V
O
≤
12V (Note 4)
mA
100
ISO I
OSD
V
0.4
V
OL
Differential
Common Mode
0.3
V
IN
= 12V
V
IN
= -7V
Figures 5 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
Figures 5 and 7, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
ns
100
25
15
275
90
40
t
PHL
t
SKEW
t
R,
t
F
Driver Input to Output
Propagation Delay
Driver Output Skew
Driver Rise or Fall Time
ns
ns
CONDITIONS
Figures 5 and 7, R
DIFF
= 54
,
C
L1
= C
L2
= 100pF
100
275
t
PLH
Figures 6 and 8, C
L
= 100pF, S2 closed
Figures 5 and 10, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
μs
0.5
1.5
t
ZH
Driver Enable to Output High
(MAX1480A only)
100
100
225
225
t
PLH
t
PHL
t
PLH
, t
PHL
< 50% of data period
Mbps
μs
μs
μs
2.5
f
MAX
t
SHDN
t
ZH(SHDN)
t
ZL(SHDN)
Maximum Data Rate
Time to Shutdown
Shutdown to Driver Output High
Shutdown to Driver Output Low
Figures 5 and 10, R
DIFF
= 54
, C
L1
= C
L2
= 100pF
ns
Receiver Input to Output
Propagation Delay
I
t
PLH
- t
PHL
I
Differential
Receiver Skew
ns
20
t
SKD
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
100
3
3
Figures 6 and 8, C
L
= 100pF, S1 closed
μs
0.5
1.5
t
ZL
Driver Enable to Output Low
(MAX1480A only)
Figures 6 and 8, C
L
= 15pF, S2 closed
μs
0.5
1.5
t
HZ
Driver Disable Time from High
(MAX1480A only)
Figures 6 and 8, C
L
= 15pF, S1 closed
μs
0.5
1.5
t
LZ
Driver Disable Time from Low
(MAX1480A only)
Figures 6 and 9, C
L
= 100pF, S2 closed
Figures 6 and 9, C
L
= 100pF, S1 closed
10
10
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