參數(shù)資料
型號(hào): MAX1490AEPG
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 通用總線功能
英文描述: Complete, Isolated RS-485/RS-422 Data Interface
中文描述: LINE TRANSCEIVER, PDIP24
封裝: PLASTIC, DIP-24
文件頁數(shù): 15/21頁
文件大?。?/td> 487K
代理商: MAX1490AEPG
M
Complete, Isolated RS-485/RS-422
Data Interface
______________________________________________________________________________________
15
Figure 6. Driver Timing Test Load
OUTPUT
UNDER TEST
500
S1
S2
ISO V
CC
_
C
L
Figure 7. Driver Propagation Delays and Transition Times
DI
0V
B
A
V
O
0V
-V
O
V
O
t
PLH
1/2 V
O
10%
t
R
90%
90%
t
PHL
1/2 V
O
10%
t
F
V
DIFF
= V (A) - V (B)
V
DIFF
V
CC_
- 0.4V
V
CC_
- 0.4V
2
t
SKEW =
t
PLH
- t
PHL
V
CC_
- 0.4V
2
Figure 8. Driver Enable and Disable Times
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0V
A, B
V
OL
A, B
0V
V
OL
+ 0.5V
V
CC_
- 0.4V
2
V
CC_
- 0.4V
2
V
CC_
-0.4V
V
OH
- 0.5V
2.3V
2.3V
t
ZL
t
LZ
t
ZH
t
HZ
DE
Figure 9. Times to/from Shutdown
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.4V
SD
0.8V
A, B
V
OL
A, B
0V
1.6V
1.6V
V
OL
+ 0.5V
V
OH
- 0.5V
2.3V
2.3V
t
ZL(SHDN)
t
SHDN
t
ZH(SHDN)
t
SHDN
Figure 10. Receiver Propagation Delays
V
OH
V
OL
-V
ID
V
ID
1.5V
0V
1.5V
1.5V
1.5V
MAX1480A/B/C
OUTPUT
MAX1490A/B
OUTPUT
INPUT
0V
RO
RO V
OH
V
OL
V
A
- V
B
t
PHL
t
PLH
t
PLH
t
PHL
t
SKEW
=
t
PLH -
t
PHL
Switching Waveforms
____________________________________________________Test Circuits (continued)
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