參數(shù)資料
型號： DS275
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： Line Driver or Receiver
英文描述： LINE TRANSCEIVER, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁數(shù)： 2/19頁
文件大?。?/td> 1664K
代理商： DS275
MAX1480E/MAX1490E
±15kV ESD-Protected, Isolated RS-485/RS-422
Data Interfaces
10
______________________________________________________________________________________
The high-speed optocouplers on the MAX1480EA/
MAX1480EC/MAX1490EA consume an additional 10mA
through VCC5 (VCC4 for the MAX1490EA). Therefore, to
completely shut down these devices, use an external P-
channel MOSFET as shown in Figure 3. In normal opera-
tion, SD is low, turning the MOSFET on and thereby
providing power to all the VCC pins. When SD is pulled
high, the power oscillator is disabled and the switch is
turned off, disconnecting power from the DI and DE opto-
couplers. In normal operating mode, the switch carries
only the optocoupler currents, so an on-resistance of sev-
eral ohms does not significantly degrade efficiency.
AC1 (MAKE NO CONNECTION)
AC2 (MAKE NO CONNECTION)
SHIELD (OPTIONAL)
EXTERNAL RS-485/RS-422 WIRING
ISO VCC1
B
D2
D1
VCC2
VCC1
ISO RO DRV
A
B
A
SH
ISO DI IN
ISO DE IN
VCC3
SD
FS
GND1
ISO COM1
ISO DI DRV
ISO VCC2
ISO DE DRV
GND2
DE
VCC4
DI
ISO COM2
ISO RO LED
VCC5
RO
RL
R4*
R5*
R7
100
R1*
R2*
R3*
R6*
DE
DI
VIN
+5V
C1
22
F
C2
0.1
F
LOGIC GROUND
ISOLATION BARRIER
ISOLATED COMMON
DRIVER INPUT
DRIVER ENABLE
RECEIVER OUTPUT
DE
DI
RO
74HC86
OR EQUIVALENT
MAX1487E
MAX487E
MAX845E
1
2
28
27
3
4
5
6
7
8
9
10
11
12
13
14
26
25
24
23
22
21
20
19
18
17
16
15
MAX845E
N
MAX1480EA: MAX1487E
MAX1480EC: MAX487E
RE
ISO RO DRV
ISO DE IN
ISO DI IN
ISO COM1
ISO VCC1
A
B
R
D
N
Q
T F/F
VCC3
FS
OSC
1.07MHz/
1.45MHz
SD
GND1
D2
D1
SHIELD (OPTIONAL)
NOTE: RESISTOR R7 PROTECTS
THE MAX1480EA FROM TRANSIENT
CURRENTS BETWEEN SHIELD AND
TRANSMISSION LINES.
TWISTED PAIR
TO OTHER TRANSCEIVERS
TERMINATING RESISTOR
(ONE RESISTOR ON EACH END)
TWISTED PAIR
TO OTHER TRANSCEIVERS
*SEE TABLE 1.
MAX1480EA
MAX1480EC
270pF
4kV
Figure 1. MAX1480EA/MAX1480EC Detailed Block Diagram and Application Circuit
Table 1. Pullup and LED Drive Resistors for Figure 1
PART
R1 (
)
R2 (
)
R3 (
)
MAX1480EA
MAX1480EC
200
1000
3000
R4 (
)
4300
3000
R5 (
)
1000
3000
R6 (
)
200
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