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MAX1480BEPI+ 数据手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
接口芯片
封装:
DIP-28
描述:
MAXIM INTEGRATED PRODUCTS MAX1480BEPI+ 芯片, 收发器, RS422/RS485 250KBPS 5.5V WDIP28
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MAX1480BEPI+数据手册
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MAX1480A/B/C, MAX1490A/B
Complete, Isolated RS-485/RS-422
Data Interface
10 ______________________________________________________________________________________
________________________________________________________________Pin Description
Internal Connections. Leave these pins unconnected.3, 43, 4
Logic-Side (nonisolated side) +5V Supply Voltages1, 2, 8, 101, 2, 8, 10
FUNCTION
PIN
D1, D2
V
CC1
–V
CC4
NAME
Shutdown Input. Ground for normal operation. When high, the power oscillator is
disabled.
77
Frequency Select Input. If FS = V
CC_
or is open, switch frequency is high; if FS
= GND, switch frequency is low. For optimal performance and minimal supply
current, connect FS to V
CC_
or leave unconnected.
66
Logic-Side Ground. Connect to GND2 (pin 12).55
SD
FS
GND1
Logic-Side (non-isolated side) +5V Supply Voltage—14
Receiver Output. If A > B by 200mV, RO will be low; if A < B by 200mV, RO will
be high. Open collector; must have pullup to V
CC_
(Table 1 of Figure 1).
—13
Logic-Side Ground. Connect to GND1 (pin 5).1212
V
CC5
RO
GND2
Receiver Output. If A > B by 200mV, RO will be high; if A < B by 200mV, RO
will be low. Open collector; must have pullup to V
CC
(Table 2 of Figure 2).
11—
Driver-Enable Input. The driver outputs, A and B, are enabled by bringing DE´
high. The driver outputs are high impedance when DE´ is low. If the driver out-
puts are enabled, the device functions as a line driver. While the driver outputs
are high impedance, the device functions as a line receiver. Drives internal
LED cathode through a resistor (Table 1 of Figure 1).
—11
Driver Input. With DE´ high (MAX1480A/B/C only), a low on DI´ forces output A
low and output B high. Similarly, a high on DI
´ forces output A high and output
B low. Drives internal LED cathode through a resistor (Table 1 of Figure 1 for
MAX1480A/B/C, Table 2 of Figure 2 for MAX1490A/B).
99
RO
DE
DI
Isolated Driver-Input Drive. With DE´ high (MAX1480A/B/C only), a low on DI´
forces output A low and output B high. Similarly, a high on DI´ forces output A
high and output B low. Connect to ISO DI IN (on the MAX1480A/B/C only) for
normal operation. Open-collector output; connect a pullup resistor to ISO V
CC_
(Table 1 of Figure 1 for MAX1480A/B/C; Table 2 of Figure 2 for MAX1490A/B).
1519
Isolated Supply Voltage. Connect to ISO V
CC1
(pin 26 for MAX1480A/B/C, or
pin 22 for MAX1490A/B).
1418
Isolated Driver-Enable Drive. The driver outputs, A and B, are enabled by bring-
ing DE
´ high. The driver outputs are high impedance when DE´ is low. If the driv-
er outputs are enabled, the device functions as a line driver. While the driver
outputs are high impedance, the device functions as a line receiver. Open-
collector output; must have pullup to ISO V
CC_
and be connected to ISO DE IN
for normal operation (Table 1 of Figure 1).
—17
ISO DI DRV
ISO V
CC2
ISO DE DRV
Isolated Common. Connect to ISO COM1 (pin 20).—16
Isolated Receiver Output LED. Internal LED anode in MAX1480A/B/C and LED
cathode in MAX1490A/B. Connect to ISO RO DRV through a resistor (Table 1 of
Figure 1 for MAX1480A/B/C; Table 2 of Figure 2 for MAX1490A/B).
1315
Isolated Common. For MAX1480A/B/C, connect to ISO COM2 (pin 16)
(Figures 1 and 2).
1620 ISO COM1
ISO COM2
ISO RO LED
MAX1480A/B/C MAX1490A/B
PINS ON THE NON-ISOLATED SIDE
PINS ON THE ISOLATED RS-485/RS-422 SIDE
PINS ON THE NON-ISOLATED SIDE
PINS ON THE ISOLATED RS-485/RS-422 SIDE
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